1b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner//===--- ExprConstant.cpp - Expression Constant Evaluator -----------------===// 2c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 3c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// The LLVM Compiler Infrastructure 4c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 5c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file is distributed under the University of Illinois Open Source 6c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// License. See LICENSE.TXT for details. 7c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 8c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 9c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 10c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file implements the Expr constant evaluator. 11c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 12745f5147e065900267c85a5568785a1991d4838fRichard Smith// Constant expression evaluation produces four main results: 13745f5147e065900267c85a5568785a1991d4838fRichard Smith// 14745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A success/failure flag indicating whether constant folding was successful. 15745f5147e065900267c85a5568785a1991d4838fRichard Smith// This is the 'bool' return value used by most of the code in this file. A 16745f5147e065900267c85a5568785a1991d4838fRichard Smith// 'false' return value indicates that constant folding has failed, and any 17745f5147e065900267c85a5568785a1991d4838fRichard Smith// appropriate diagnostic has already been produced. 18745f5147e065900267c85a5568785a1991d4838fRichard Smith// 19745f5147e065900267c85a5568785a1991d4838fRichard Smith// * An evaluated result, valid only if constant folding has not failed. 20745f5147e065900267c85a5568785a1991d4838fRichard Smith// 21745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A flag indicating if evaluation encountered (unevaluated) side-effects. 22745f5147e065900267c85a5568785a1991d4838fRichard Smith// These arise in cases such as (sideEffect(), 0) and (sideEffect() || 1), 23745f5147e065900267c85a5568785a1991d4838fRichard Smith// where it is possible to determine the evaluated result regardless. 24745f5147e065900267c85a5568785a1991d4838fRichard Smith// 25745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A set of notes indicating why the evaluation was not a constant expression 26745f5147e065900267c85a5568785a1991d4838fRichard Smith// (under the C++11 rules only, at the moment), or, if folding failed too, 27745f5147e065900267c85a5568785a1991d4838fRichard Smith// why the expression could not be folded. 28745f5147e065900267c85a5568785a1991d4838fRichard Smith// 29745f5147e065900267c85a5568785a1991d4838fRichard Smith// If we are checking for a potential constant expression, failure to constant 30745f5147e065900267c85a5568785a1991d4838fRichard Smith// fold a potential constant sub-expression will be indicated by a 'false' 31745f5147e065900267c85a5568785a1991d4838fRichard Smith// return value (the expression could not be folded) and no diagnostic (the 32745f5147e065900267c85a5568785a1991d4838fRichard Smith// expression is not necessarily non-constant). 33745f5147e065900267c85a5568785a1991d4838fRichard Smith// 34c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 35c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 36c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/APValue.h" 37c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/ASTContext.h" 38a93d0f280693b8418bc88cf7a8c93325f7fcf4c6Benjamin Kramer#include "clang/AST/ASTDiagnostic.h" 39199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 40a93d0f280693b8418bc88cf7a8c93325f7fcf4c6Benjamin Kramer#include "clang/AST/Expr.h" 4119cc4abea06a9b49e0e16a50d335c064cd723572Anders Carlsson#include "clang/AST/RecordLayout.h" 420fe52e1bcaa69ba127f1bda036f057fec1f478deSeo Sanghyeon#include "clang/AST/StmtVisitor.h" 438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/TypeLoc.h" 441b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/Basic/Builtins.h" 4506a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 467462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 47a93d0f280693b8418bc88cf7a8c93325f7fcf4c6Benjamin Kramer#include "llvm/Support/raw_ostream.h" 484572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith#include <functional> 504572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 51c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 52f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 53d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 54c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 5583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool IsGlobalLValue(APValue::LValueBase B); 5683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 57c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 58180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 59d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 60bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 61d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 6283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static QualType getType(APValue::LValueBase B) { 631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 681bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 69180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 70f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field or base class. 7183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static 72f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith APValue::BaseOrMemberType getAsBaseOrMember(APValue::LValuePathEntry E) { 73180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 74180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 75f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return Value; 76f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 77f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 78f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 79f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field declaration. 8083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const FieldDecl *getAsField(APValue::LValuePathEntry E) { 81f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<FieldDecl>(getAsBaseOrMember(E).getPointer()); 82180f47959a066795cc0f409433023af448bb0328Richard Smith } 83180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 84180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 8583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 86f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<CXXRecordDecl>(getAsBaseOrMember(E).getPointer()); 87180f47959a066795cc0f409433023af448bb0328Richard Smith } 88180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 89180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 9083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static bool isVirtualBaseClass(APValue::LValuePathEntry E) { 91f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return getAsBaseOrMember(E).getInt(); 92180f47959a066795cc0f409433023af448bb0328Richard Smith } 93180f47959a066795cc0f409433023af448bb0328Richard Smith 94b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 95b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 96b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 97b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 98b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 99b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 100b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 101b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 1029a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 103b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 104b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 105b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 10986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (Type->isAnyComplexType()) { 11086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith const ComplexType *CT = Type->castAs<ComplexType>(); 11186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Type = CT->getElementType(); 11286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ArraySize = 2; 11386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedLength = I + 1; 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 118b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1199a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 121b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1229a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1249a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1259a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 127b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 128b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex, 12986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CSK_This, CSK_Real, CSK_Imag 130b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 131b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1380a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 146b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 148b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 150b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1520a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1539a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1549a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1570a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 158b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1590a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 160b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 161b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1679a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1719a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 172b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1789a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1790a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1810a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1820a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 183b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 185b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 200b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 212b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 213b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 219180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 220180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2290a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 23086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith /// Update this designator to refer to the given complex component. 23186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplexUnchecked(QualType EltTy, bool Imag) { 23286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith PathEntry Entry; 23386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entry.ArrayIndex = Imag; 23486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entries.push_back(Entry); 23586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 23686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // This is technically a most-derived object, though in practice this 23786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // is unlikely to matter. 23886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedType = EltTy; 23986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedArraySize = 2; 24086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedPathLength = Entries.size(); 24186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 242b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2430a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 244b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2450a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 246b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2479a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 248b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 249b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 250b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 251b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2520a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2530a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 254b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 256b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 257b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 258b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 259b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 260b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 261b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 262b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2630a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 264b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2670a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 268bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 269bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 270bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 271bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 272bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 273bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 274bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 27508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 27608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 27708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 27808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 27908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 28008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 28183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// Index - The call index of this call. 28283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned Index; 28383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 284180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 285180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 286180f47959a066795cc0f409433023af448bb0328Richard Smith 287bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 288bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 2891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments; 290bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 291f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman // Note that we intentionally use std::map here so that references to 292f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman // values are stable. 293f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman typedef std::map<const Expr*, APValue> MapTy; 294bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 295bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 296bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 297bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 29908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 3001aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments); 301bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 302bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 303bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 304dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 305dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 306dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 307dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 308dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 309dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 310dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 311dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 312dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 313dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 314dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 315dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 316dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 317dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 318789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 319789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 320789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 321cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<char, 32> Buffer; 322789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 323789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 324789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 325789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 326789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 327789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 328789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 329789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 330cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<char, 32> Buffer; 331789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 332789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 333789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 334789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 335789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 336dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 337dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 34183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 34283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 34483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 34583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 34683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 34883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 34983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 35083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 35183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 352c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 353dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 354d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis 3551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3561e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 357f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 358d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 359bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 360d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 361d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 362d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 363d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 36483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 36583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 36683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 367bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 368745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 370bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 371180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 372180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 373180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 374180f47959a066795cc0f409433023af448bb0328Richard Smith 375180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 376180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 377180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 378180f47959a066795cc0f409433023af448bb0328Richard Smith 379c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 380c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 381c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 382c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 383745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 384745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 385745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 386745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 387ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 388ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian bool IntOverflowCheckMode; 389745f5147e065900267c85a5568785a1991d4838fRichard Smith 390ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian EvalInfo(const ASTContext &C, Expr::EvalStatus &S, 391ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian bool OverflowCheckMode=false) 392dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 39383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 39483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 395745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 396ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian CheckingPotentialConstantExpression(false), 397ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian IntOverflowCheckMode(OverflowCheckMode) {} 398bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 399180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 400180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 401180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 402180f47959a066795cc0f409433023af448bb0328Richard Smith } 403180f47959a066795cc0f409433023af448bb0328Richard Smith 4044e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &getLangOpts() const { return Ctx.getLangOpts(); } 405c18c42345636e2866fed75c7e434fb659d747672Richard Smith 406c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 407745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 408745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 409745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 410745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 41183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 41283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 41383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 41483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 41583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 416c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 417c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 418c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 419c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 420c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 421c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 42383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 42483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 42583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 42683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 42783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 42883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 42983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 43083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 43183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 43283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 433c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 434c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 435c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 436c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 437c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 438c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 44108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 44208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 44308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 444c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 448c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 449f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 451f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 452dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 45308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 45408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 45508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 45608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 457745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 458745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 45908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 460c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 461dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 46208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 46308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 464745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 465745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 46608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 467dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 468c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 469dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 470dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 471dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 4725cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic Diag(const Expr *E, diag::kind DiagId 4735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith = diag::note_invalid_subexpr_in_const_expr, 4745cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith unsigned ExtraNotes = 0) { 4755cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (EvalStatus.Diag) 4765cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Diag(E->getExprLoc(), DiagId, ExtraNotes); 4775cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith HasActiveDiagnostic = false; 4785cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return OptionalDiagnostic(); 4795cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith } 4805cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith 481ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian bool getIntOverflowCheckMode() { return IntOverflowCheckMode; } 482ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 483dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 484dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4855cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith template<typename LocArg> 4865cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic CCEDiag(LocArg Loc, diag::kind DiagId 4877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 488c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 489dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 49051e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 49151e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 492dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 49351e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 495c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 501c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 503099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 504099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 505099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 506099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 507099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 510099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 511745f5147e065900267c85a5568785a1991d4838fRichard Smith 512745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 513745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 514745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 515ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian // Should return true in IntOverflowCheckMode, so that we check for 516ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian // overflow even if some subexpressions can't be evaluated as constants. 517ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian return IntOverflowCheckMode || 518ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian (CheckingPotentialConstantExpression && 519ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian EvalStatus.Diag && EvalStatus.Diag->empty()); 520745f5147e065900267c85a5568785a1991d4838fRichard Smith } 521c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 53874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 53974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 54074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 54174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 54274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 54374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 54474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 54574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 54674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 547cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVectorImpl<PartialDiagnosticAt> *NewDiag = 0) 54874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 54974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 55074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 55274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 55374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 55508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 55608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 557b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 559b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 560b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 561b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 5625cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) 563b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 564b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 568b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 5735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 5775cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 578b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 579b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 580b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 581b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 58308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 5841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments) 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 58683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 58708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 59308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 598cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenkostatic void describeCall(CallStackFrame *Frame, raw_ostream &Out) { 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6015ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6025ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6095fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 61008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 6131aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue &Arg = Frame->Arguments[ArgIndex]; 6141aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 618bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 619d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 62008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 646cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<char, 128> Buffer; 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 64908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 650bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 65108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 652d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 655f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 657f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 658f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 659f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 660f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 662f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 664f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 665f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 666f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 667f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 668f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 669f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 670f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 671f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 672f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 673f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 6741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &v) const { 675f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 6761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(FloatReal, FloatImag); 677f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 6781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(IntReal, IntImag); 679f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 6801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &v) { 68156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 68256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 68356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 68456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 68556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 68656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 68756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 68856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 68956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 69056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 69156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 692f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 693efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 694efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6951bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 696efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 69783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 6980a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 699efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 70147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 702625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 70383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 706efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7081aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (Designator.Invalid) 7091aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, APValue::NoLValuePath(), CallIndex); 7101aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 7111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, Designator.Entries, 7121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator.IsOnePastTheEnd, CallIndex); 713efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 7141aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(ASTContext &Ctx, const APValue &V) { 71547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 71647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 71747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 71883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator = SubobjectDesignator(Ctx, V); 7200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 72283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7240a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 72583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 727b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 731b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 732b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 7365cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_null_subobject) 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 7475cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // Outside C++11, do not build a designator referring to a subobject of 7485cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // any object: we won't use such a designator for anything. 74980ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (!Info.getLangOpts().CPlusPlus11) 7505cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.setInvalid(); 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 752b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 753b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 754b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 755b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 756b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 7575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) 7585cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addDeclUnchecked(D, Virtual); 759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 7615cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, CSK_ArrayToPointer)) 7625cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addArrayUnchecked(CAT); 763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 76486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 7655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) 7665cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addComplexUnchecked(EltTy, Imag); 76786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 768b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 7695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkNullPointer(Info, E, CSK_ArrayIndex)) 7705cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.adjustIndex(Info, E, N); 77156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 772efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7941aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7951aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(getDecl(), isDerivedMember(), Path); 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 7971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &V) { 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 862c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 863b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 864b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 865b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 866b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 867b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 868b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 869b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 870b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 871b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 872c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 873c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 874c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 875c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 876c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 877c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 878f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 87987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 8801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); 88183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 88283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 88383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 88483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 885efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 886efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 89087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 8911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 892d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 893d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 894f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 895f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 896f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 900180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 901180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 902180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 903180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 904180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 905180f47959a066795cc0f409433023af448bb0328Richard Smith} 906180f47959a066795cc0f409433023af448bb0328Richard Smith 9071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 908180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 909180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 910180f47959a066795cc0f409433023af448bb0328Richard Smith 911180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 912180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 91442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 916180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 91842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9191bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 92142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9251bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 927b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 928b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 929b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 930b78ae9716576399145786b93f687943f8b197170Richard Smith } 931180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 932180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 933180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 934180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 935180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 93647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 937e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet case Expr::CXXUuidofExprClass: 938180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 939180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 940180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 941180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 942180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 943180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 944180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 945180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 946180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 947180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 948745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 949745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 950745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 951745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 952745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 953745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 954745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 955745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 956180f47959a066795cc0f409433023af448bb0328Richard Smith } 95742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 95842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 95983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 96083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 96183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 96283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 96383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 96483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 965890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek Info.Note(Base.get<const Expr*>()->getExprLoc(), 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 96783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 96883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 9701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// value for an address or reference constant expression. Return true if we 9711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// can fold this expression, whether or not it's a constant expression. 97283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 97383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 97483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 97583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 976c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 977c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 978c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 979b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 980b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 981b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 982c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 98380ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) { 984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 98583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 98683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 98783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 98883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 989c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 99083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 991c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 99261e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 99369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 994f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 99583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 99683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 99783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 998b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 99948def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg // Check if this is a thread-local variable. 100048def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) { 100148def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (const VarDecl *Var = dyn_cast<const VarDecl>(VD)) { 100248def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (Var->isThreadSpecified()) 100348def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg return false; 100448def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg } 100548def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg } 100648def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg 1007b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1012b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1013b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1014b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 101583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 101661e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1017b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1018b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1019c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1020b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1021c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 102283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1023c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 102483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1025c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1026c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 102769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 102847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 102947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 103051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 103151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 103251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 103351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 103451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 103551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 103651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 103780ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) 10385cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) 103951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 104051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 10415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 104251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 104351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 104451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10459a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 107483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 107583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 107683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 107883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 108283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 1083262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 1084262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Value.getStructField(I->getFieldIndex()))) 108583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 108683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 109083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 10911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LVal.setFrom(Info.Ctx, Value); 109283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10939a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 109483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 109583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 109683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10979a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10989a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10999e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 11001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 11019e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11029e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 11039e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 110483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 11059e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11069e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 110765ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 110865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11090dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 111065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 111165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 11121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { 11133554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11143554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1115e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1116e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11173554283157190e67918fad4221a5e6faf9317362John McCall return true; 11183554283157190e67918fad4221a5e6faf9317362John McCall } 11193554283157190e67918fad4221a5e6faf9317362John McCall 1120e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1121e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11223554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1123e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11240dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11255bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11265bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 11271aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool HandleConversionToBool(const APValue &Val, bool &Result) { 1128c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1129c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1130c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1131c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 113341bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1136a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1138c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1140c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1141c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1142c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1143c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1144436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1145e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1147e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1148e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1149e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1151cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1152180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1153180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 115465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1155c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11564efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1158c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1159c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1160c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1161c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1162c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1163c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 11641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 1165d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis if (!Evaluate(Val, Info, E)) 1166c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1167d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis return HandleConversionToBool(Val, Result); 11684efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11694efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 117126dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedmanstatic void HandleOverflow(EvalInfo &Info, const Expr *E, 1172c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 117326dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman Info.CCEDiag(E, diag::note_constexpr_overflow) 1174789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1175c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1176c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1177c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1179c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1180c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1181a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1182575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1184c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1185a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1187c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 118826dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1189c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1190a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1191a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1193c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1194c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1195c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1196a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1197c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1198c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1199c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 120026dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1201c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1202a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1203a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1204f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1205f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1206f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1207f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1208a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1209a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1210a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12119f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1212575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1213a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1214a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1215a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1216c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1218c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1220c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1221c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 122326dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1224c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1225a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1226a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1228e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 12291aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue SVal; 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 12575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1261e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1263e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1265e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1266e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1267e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1268e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1269e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 12705cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1271e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1272e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1273e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1280180f47959a066795cc0f409433023af448bb0328Richard Smith 1281b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1282b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1283b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1284b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1285b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1286b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1287180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1288180f47959a066795cc0f409433023af448bb0328Richard Smith 1289b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1290e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1291e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 12928d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 1293180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1294180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1296180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1298180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1299180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1300180f47959a066795cc0f409433023af448bb0328Richard Smith } 1301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1302180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1303180f47959a066795cc0f409433023af448bb0328Richard Smith} 1304180f47959a066795cc0f409433023af448bb0328Richard Smith 13058d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1306180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1307180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1308180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 13098d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!RL) { 13108d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (Derived->isInvalidDecl()) return false; 13118d59deec807ed53efcd07855199cdc9c979f447fJohn McCall RL = &Info.Ctx.getASTRecordLayout(Derived); 13128d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 13138d59deec807ed53efcd07855199cdc9c979f447fJohn McCall 1314180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1315b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 13168d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1317180f47959a066795cc0f409433023af448bb0328Richard Smith} 1318180f47959a066795cc0f409433023af448bb0328Richard Smith 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1320180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1321180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1322180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1323180f47959a066795cc0f409433023af448bb0328Richard Smith 13248d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!Base->isVirtual()) 13258d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1326180f47959a066795cc0f409433023af448bb0328Richard Smith 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1328b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1329b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1330b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1331180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1332b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1333b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1334180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1335180f47959a066795cc0f409433023af448bb0328Richard Smith 1336b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 13378d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (DerivedDecl->isInvalidDecl()) return false; 1338180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1339180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1340b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1341180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1342180f47959a066795cc0f409433023af448bb0328Richard Smith} 1343180f47959a066795cc0f409433023af448bb0328Richard Smith 1344180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1345180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 13468d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1347180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1348180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 13498d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!RL) { 13508d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (FD->getParent()->isInvalidDecl()) return false; 1351180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 13528d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 1353180f47959a066795cc0f409433023af448bb0328Richard Smith 1354180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1355180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1356b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 13578d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1358180f47959a066795cc0f409433023af448bb0328Richard Smith} 1359180f47959a066795cc0f409433023af448bb0328Richard Smith 1360d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 13618d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1362d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1363d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1364d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1365d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 13668d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C))) 13678d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 13688d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1369d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1370d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1371180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 137274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 137374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1374180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1375180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1376180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1377180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1378180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1379180f47959a066795cc0f409433023af448bb0328Richard Smith } 1380180f47959a066795cc0f409433023af448bb0328Richard Smith 1381180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1382180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 138374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 138474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1385180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1386180f47959a066795cc0f409433023af448bb0328Richard Smith } 1387180f47959a066795cc0f409433023af448bb0328Richard Smith 1388180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1389180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1390180f47959a066795cc0f409433023af448bb0328Richard Smith} 1391180f47959a066795cc0f409433023af448bb0328Richard Smith 1392180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1393180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1394b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1395180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1396180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1397180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1398b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1399b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1400b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1401180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 140274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1403180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1404180f47959a066795cc0f409433023af448bb0328Richard Smith 1405180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1406180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1407b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1408180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1409180f47959a066795cc0f409433023af448bb0328Richard Smith} 1410180f47959a066795cc0f409433023af448bb0328Richard Smith 141186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 141286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 141386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 141486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 141586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 141686024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 141786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 141886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 141986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 142086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 142186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 142286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 142386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 142486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 142586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 142686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 142786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 142886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 142903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1430f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 14321aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith CallStackFrame *Frame, APValue &Result) { 1433d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1434d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1435d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1436745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1437745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1438745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1439745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 14415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1442177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1444177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1445177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1446d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 144703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1448099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1449099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1450099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1451745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1452745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1453745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 14545cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1455099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1456099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1457099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1458180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1459180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1460180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 14611aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *Info.EvaluatingDeclValue; 1462180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1463180f47959a066795cc0f409433023af448bb0328Richard Smith } 1464180f47959a066795cc0f409433023af448bb0328Richard Smith 146565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 146665ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1467f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 14685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 146965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1470f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 147165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1472099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1473099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1474cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<PartialDiagnosticAt, 8> Notes; 1475099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 14765cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_var_init_non_constant, 1477099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1478099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1479099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 148047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1481099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 14825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, 1483099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1484099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1485099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1486f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 148703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 14881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *VD->getEvaluatedValue(); 148947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 149003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 149103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1492c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 149303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 149403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 149503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 149603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 149759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 149859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 149959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 150059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 150159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 150259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 150359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 150459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 150559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 150659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 150759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 150859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 150959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 151059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 151159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1512fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// Extract the value of a character from a string literal. CharType is used to 1513fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// determine the expected signedness of the result -- a string literal used to 1514fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// initialize an array of 'signed char' or 'unsigned char' might contain chars 1515fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// of the wrong signedness. 1516f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1517fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith uint64_t Index, QualType CharType) { 1518f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1519f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1520f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1521fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith assert(CharType->isIntegerType() && "unexpected character type"); 1522f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1523f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1524fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith CharType->isUnsignedIntegerType()); 1525f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1526f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1527f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1528f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1529f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1530cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1531f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 15321aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Obj, QualType ObjType, 1533cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1534b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1535b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1536cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1537b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 153880ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus11 ? 1539aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1540aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1543f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1544cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1545745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1546745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1547745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1548cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 15490069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue *O = &Obj; 1550180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1551cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1552cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1553180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1554cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1555f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1556cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1557f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 156080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus11 ? 1561aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1562aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1563cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1564f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1565f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1566f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1567f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1568f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1569f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 15701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(ExtractStringLiteralCharacter( 1571fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith Info, O->getLValueBase().get<const Expr*>(), Index, SubType)); 1572f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1573f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1574cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1575cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1576cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1577cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 157886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 157986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 158086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 158186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 158280ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus11 ? 158386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 158486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 158586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 158686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 158786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 158886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 15891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexIntImag() 159086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 159186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 159286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 15931aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexFloatImag() 159486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 159586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 159686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1597180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1598b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 15995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_mutable, 1) 1600b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1601b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1602b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1603b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1604b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1605180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1606180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1607180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1608180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1609180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 16115cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_inactive_union_member) 16127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1613180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1615180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1616180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1617180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1618180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16235cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_volatile_obj, 1) 16247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16275cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 16287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1631cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1632180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 163359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 163459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 163559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 163659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1637cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1638180f47959a066795cc0f409433023af448bb0328Richard Smith 1639f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1640745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 16415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_uninit); 1642180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1644cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1645cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 16460069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // This may look super-stupid, but it serves an important purpose: if we just 16470069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // swapped Obj and *O, we'd create an object which had itself as a subobject. 16480069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // To avoid the leak, we ensure that Tmp ends up owning the original complete 16490069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // object, which is destroyed by Tmp's destructor. 16500069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue Tmp; 16510069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith O->swap(Tmp); 16520069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith Obj.swap(Tmp); 1653cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1654cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1655cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1656f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1657f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1658f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1659f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1660f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1661f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1662f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1663f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 166486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 166586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1666f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1667f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1668f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1669f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1670f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 167186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 167286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 167386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 167486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1675f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1676f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1677f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1678f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1679f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1696f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1697f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1698f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1699f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1700f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1701f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1704f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1705f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1706f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1707f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1708f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1709f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1710f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1711f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1712f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1713180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1714180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1715180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1716180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1717180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1718f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1719f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17209ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17219ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1722180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1723180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1724f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1725f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 17261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const LValue &LVal, APValue &RVal) { 1727b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1732c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1733f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1734f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17355cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 17367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 173983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 174083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 174183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 174283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 17435cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 174483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 174583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 174683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 174783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 174883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_type) << Type; 17567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1758c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1759f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1760c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17611bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1762c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1763c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1764d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1765d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1766c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1767c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1768d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (VD) { 1769d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) 1770d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor VD = VDef; 1771d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor } 1772f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 17735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1775f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1776f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 17777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 17791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17855cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1786f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17965cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 18047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 18057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 18067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 180780ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) { 18085cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18115cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv); 18127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 181580ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) { 18165cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18195cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1822f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1825f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1826c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1827c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 182847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1829f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1830c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1831c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1832c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1835c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18381bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 183983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 184083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 184183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 184283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 18435cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 184483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 184583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 184683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 184783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 184883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 184983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1850c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1851c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18585cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1863177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1864cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1866177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1867cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1868cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1869cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1870cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1871cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1872c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1873cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1874cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1875f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1876f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1877f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1878f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 18791aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RVal = APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0); 1880f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 18815cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 1882cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1883f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1884c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1885f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1886f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1887c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1888c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 188959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 189059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 189159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 189259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 189359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 189459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 189559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 189659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 189759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1913e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1917e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1919e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1921745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1922745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1924e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1925e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1927e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1934745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1935745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1936745f5147e065900267c85a5568785a1991d4838fRichard Smith 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1941b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1955b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1956b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1957b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1964e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1970e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 19728d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, BO, LV, RD, Base)) 19738d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 19778d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord())) 19788d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 1979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1981e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 19838d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) { 19848d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, BO, LV, FD)) 19858d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 19868d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } else if (const IndirectFieldDecl *IFD = 19878d59deec807ed53efcd07855199cdc9c979f447fJohn McCall dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) { 19888d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueIndirectMember(Info, BO, LV, IFD)) 19898d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 19908d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } else { 1991d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 19928d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 1993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 2000e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 2001e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 2002e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 2003b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 2004e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 2007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 2008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 2009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 2011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 20125cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2013b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2014b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 2015b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2016b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2017b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 2018b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 2019b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 2020e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 2021e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2022b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2023b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2024b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2025e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2026b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 20275cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2028b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2029e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2030b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2031e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2032e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2033b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 203459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 203559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2036c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2037d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2038d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2039d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2040d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2041d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2042d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2043d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2044d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2045d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 20481aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 2049d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2050d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2051d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2052d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2053d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2054d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2055d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2056d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2057d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2058c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2059c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 206083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2061c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2063c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2064d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2065d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2066d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2067d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2068d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2069d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2070d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2071d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2072d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2073d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2074d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2075d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2076d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2077d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 208351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 208451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20856180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20866180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20876180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 209280ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) { 20934c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20944c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20954c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20964c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20974c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20986180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20996180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 21006180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21016180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21026180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 21036180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 21046180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2105c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2106c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2107c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2110745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2111745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2112745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2113745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2114745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2115745f5147e065900267c85a5568785a1991d4838fRichard Smith 2116c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2117c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2118c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2119c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 212080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) { 2121c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2122099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2123099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2124c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2125c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2126c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2127c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2128c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2129c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2130c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2131c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2132c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2133c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2134180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 21351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithtypedef SmallVector<APValue, 8> ArgVector; 2136180f47959a066795cc0f409433023af448bb0328Richard Smith} 2137180f47959a066795cc0f409433023af448bb0328Richard Smith 2138180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2139180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2140180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2141745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2142180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2143745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2144745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2145745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2146745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2147745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2148745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2149745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2150745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2151745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2152745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2153180f47959a066795cc0f409433023af448bb0328Richard Smith} 2154180f47959a066795cc0f409433023af448bb0328Richard Smith 2155d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2156745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2157745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2158f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 21591aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith EvalInfo &Info, APValue &Result) { 2160180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2161180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2162180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2163d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2164745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2165745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2166745f5147e065900267c85a5568785a1991d4838fRichard Smith 2167745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2168d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2169d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2170d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2171180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2172745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 217359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2174180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 217551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2176180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2177180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2178180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2179180f47959a066795cc0f409433023af448bb0328Richard Smith 2180745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2181745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2182745f5147e065900267c85a5568785a1991d4838fRichard Smith 218386c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 218486c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 218586c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 218686c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 218786c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 218886c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2189745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2190180f47959a066795cc0f409433023af448bb0328Richard Smith 2191180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2192180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2193180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 219483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2195180f47959a066795cc0f409433023af448bb0328Richard Smith } 2196180f47959a066795cc0f409433023af448bb0328Richard Smith 2197610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2198610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2199610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2200610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2201f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor ((Definition->isCopyConstructor() && Definition->isTrivial()) || 2202f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor (Definition->isMoveConstructor() && Definition->isTrivial()))) { 2203610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 22041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS.setFrom(Info.Ctx, ArgValues[0]); 22051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 22061aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS, Result); 2207610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2208610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2209610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 221051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2211180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2212180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2213180f47959a066795cc0f409433023af448bb0328Richard Smith 22148d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 2215180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2216180f47959a066795cc0f409433023af448bb0328Richard Smith 2217745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2218180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2219180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2220180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2221180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2222180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2223180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2224745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2225745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2226745f5147e065900267c85a5568785a1991d4838fRichard Smith 2227745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2228180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2229180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2230180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2231180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 223286c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2233180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2234180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2235180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2236180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2237180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 22388d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 22398d59deec807ed53efcd07855199cdc9c979f447fJohn McCall BaseType->getAsCXXRecordDecl(), &Layout)) 22408d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2241745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2242180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 22438d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout)) 22448d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2245180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2246180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2247745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2248745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2249745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2250745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2251d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2252d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2253d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2254d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2255d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2256d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2257d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2258d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2259d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2260d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2261d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2262d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2263d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2264d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2265d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2266d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2267d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2268d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2269d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2270d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2271d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 22728d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, (*I)->getInit(), Subobject, FD)) 22738d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2274d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2275d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2276d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2277d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2278d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2279180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2280d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2281180f47959a066795cc0f409433023af448bb0328Richard Smith } 2282745f5147e065900267c85a5568785a1991d4838fRichard Smith 228383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 228483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2285745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2286745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2287745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2288745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2289745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2290745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2291745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2292180f47959a066795cc0f409433023af448bb0328Richard Smith } 2293180f47959a066795cc0f409433023af448bb0328Richard Smith 2294745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2295180f47959a066795cc0f409433023af448bb0328Richard Smith} 2296180f47959a066795cc0f409433023af448bb0328Richard Smith 22974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 22988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 22998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 23008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 23018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2303f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 23048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 23058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 23071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RetTy DerivedSuccess(const APValue &V, const Expr *E) { 23088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 231051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 231151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2312f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 231474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 231574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 231674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 231774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 231874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 231974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 232074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 232174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 232274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 2323cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<PartialDiagnosticAt, 8> Diag; 232474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 232574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 232674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 232774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 232874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 232974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 233074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 233174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 233274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 233374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 233474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 233574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 233674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 233774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 233874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 233974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 234074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 234174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 234274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 234374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 234474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 234574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 234674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 234774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 234874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 234974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 235074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 235174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 235274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 23538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 23548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 23558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 23568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 23578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2358dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 23595cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Info.CCEDiag(E, D); 2360f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2361f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2362cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2363cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2364cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 2365cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 2366cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2367cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &getEvalInfo() { return Info; } 2368cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2369f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2370f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2371f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 23725cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, D); 2373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2374f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2378f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2380b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2383f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 23878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 23898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 23918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 23938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 23948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 23958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 239691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 239791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 23983d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 23993d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2400bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2401bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2402bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2403bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 24048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2405c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2406c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2407c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2408c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2409c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2410c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2411c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2412c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2413c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2414e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2415e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2416e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2417f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2418e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2419e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2420e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2421e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2422e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2423e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2424e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2425e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2426e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2427e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 24281aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2429f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2430e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2431e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2432e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2433e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2434e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2435e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 24368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 2437e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith // Evaluate and cache the common expression. We treat it as a temporary, 2438e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith // even though it's not quite the same thing. 2439e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith if (!Evaluate(Info.CurrentCall->Temporaries[E->getOpaqueValue()], 2440e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith Info, E->getCommon())) 2441f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 24428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 244374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 24448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2447f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2448f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2449f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2450f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2451f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2452f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2453f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2454f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2455f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2456f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2457f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2458f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2459f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2460f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2461f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2462f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2463f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 246474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2465f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2466f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2467f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2468f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2469f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2470f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 24718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 2474e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith APValue &Value = Info.CurrentCall->Temporaries[E]; 2475e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith if (Value.isUninit()) { 247642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 247742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2478f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 247942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 248042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2481f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 248242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 248342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 248442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 2485e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith return DerivedSuccess(Value, E); 24868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2487f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2488d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2489e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2490d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2491d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 24926142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 249359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 2494cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko ArrayRef<const Expr *> Args(E->getArgs(), E->getNumArgs()); 249586c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 249659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 249759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 249859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2502e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2505e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 250686c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2507e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2508e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2509f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2510f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2512e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2515f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2516f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2517f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 251859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2519b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2520b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2521f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 252259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2523b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2524f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25251bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 25261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 252759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2528f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 252959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 253059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 253159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 253259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 253359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2534f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2535f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2536f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2537f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 254059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 254159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 254259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 254359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 254459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2545d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 254659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 254759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 254959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2550f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2551d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2552b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2553b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2554b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 255586c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 255686c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 255786c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 255886c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 255986c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 256086c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2561c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2562d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 25631aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2564d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2565c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2566745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2567745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2568f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2569d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 257083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2571d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2572d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2573c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2574c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2575c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2576f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 257771523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 257871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 257971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 258071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2581f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2582f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2583f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 258451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2585f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2586f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 258751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2588f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 259051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2592f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2593180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2594180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2595180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2596180f47959a066795cc0f409433023af448bb0328Richard Smith 25971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 2598180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2599180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2600180f47959a066795cc0f409433023af448bb0328Richard Smith 2601180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2602180f47959a066795cc0f409433023af448bb0328Richard Smith 2603180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2604f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2605180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2606890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == 2607180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2608180f47959a066795cc0f409433023af448bb0328Richard Smith 2609b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2610b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2611180f47959a066795cc0f409433023af448bb0328Richard Smith 2612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2613180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2614180f47959a066795cc0f409433023af448bb0328Richard Smith } 2615180f47959a066795cc0f409433023af448bb0328Richard Smith 2616c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2617c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2618c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2619c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2620c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26217a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26227a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2623c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26247d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2625c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2626c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2627c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2628c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2629f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 26311aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RVal; 26329ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 26339ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 26349ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2635f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2636f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2637c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2638c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2639c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2641c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2642c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26438327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 26448327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 26451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 26468327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 26478327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 26488327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 26498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 26508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 26528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 26741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 26751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(this->Info.Ctx, V); 2676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2677e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2680e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2681e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2685890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek BaseTy = E->getBase()->getType()->castAs<PointerType>()->getPointeeType(); 2686c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2687af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2688c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2689c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2690c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2696e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2697d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2698d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2699d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2700d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2701d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 27028d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(this->Info, E, Result, FD)) 27038d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2704d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 27058d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueIndirectMember(this->Info, E, Result, IFD)) 27068d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2707d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2708d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2709e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2710d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 27111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RefValue; 2712d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2713e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2714e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2747b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 27614efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2762c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2763c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2764c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2765c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2766c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2767c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2768c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 27691bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 27701bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 27711bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 27721bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2773c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2774c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 277547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2776c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2777180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2778c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2779c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2780c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2781c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 27821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 278383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 278483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 27851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 27864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 27874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2788770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 27904efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 27931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2794c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2795c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 27978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2798bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 27998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 28008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 28018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 28028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 280347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 2804e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet bool VisitCXXUuidofExpr(const CXXUuidofExpr *E); 28058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 28068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 280786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 280886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 28098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 281126bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 281226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 281426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2815db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2816c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2821db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2823180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2824180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 282626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 282726bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 28284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 28294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 28304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2831c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2832c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2835c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2836efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2838c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 28408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 28414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 28438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 28441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 28451bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 28461bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2847c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2848c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2849c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2850436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2851c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2852177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2853177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 285483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2855177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2856177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 28571bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2858177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 285950c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 28601aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue V; 2861f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2862f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2863f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 286435873c49adad211ff466e34342a52665742794f5Anders Carlsson} 286535873c49adad211ff466e34342a52665742794f5Anders Carlsson 2866bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2867bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2869af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 287283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 287383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 287483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2882f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 288583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2887bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2888bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 28898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 28908cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2891c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2892c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2893c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2894efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 28954efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 289747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 28989be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith if (!E->isPotentiallyEvaluated()) 289947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 29009be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith 29019be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith Info.Diag(E, diag::note_constexpr_typeid_polymorphic) 29029be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith << E->getExprOperand()->getType() 29039be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith << E->getExprOperand()->getSourceRange(); 29049be36ab27b874b404099650e0c29bc92f3c7662dRichard Smith return false; 290547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 290647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 2907e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichetbool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) { 2908e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet return Success(E); 2909e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet} 2910e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet 29118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2912c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2913c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2914c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2915c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2916c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2918d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2919d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2920d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2921d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2923d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2924d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2925d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2926180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2927e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 29284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2931c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2932c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2933f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2934c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29353068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2936efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 29371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29383068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 29393068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2940efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2941180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2942180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2943180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 29443068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2945b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 29463068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 29474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2949efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2950e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2951e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 295286024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 295386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 295486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 295586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 295686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 295786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 295886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 295986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 296086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 296186024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 296286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 296386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 296486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 296586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 296686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 296786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 296886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 296986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 29704efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2971f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2972f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2973f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2974c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2975770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 29768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2977efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2978efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 29798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 29801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2981efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2982efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 29832bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 29841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2985efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 29868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2987f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 29881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 29891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, V); 29908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 29912bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 299251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2993f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2994f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 29952bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2996efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 29978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2998efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 29998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3000efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 3001eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) 3002ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek { return Success(E); } 30038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3004efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 30058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 30068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3007469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3008efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3009f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3010b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3011180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3012180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3013f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3014180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3015180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3016180f47959a066795cc0f409433023af448bb0328Richard Smith } 301756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3018ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30192bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3020f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30212bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3022efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3023c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3025f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3026650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3027efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 30282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 30292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3030e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 30311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3032650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3033650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3034650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3035f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 30361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3037745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3038745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3039efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3041efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3042745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3043efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3044efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3045efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3046efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 30470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 30480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3049650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3050890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType Pointee = PExp->getType()->castAs<PointerType>()->getPointeeType(); 3051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3052b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3053650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 30544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3055efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3056efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 30574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 30608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3061650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 306209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 306309a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 306409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 306509a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 30671d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 30681d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 30692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 307028c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 307128c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3072c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3073c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3074c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 30754cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 307628c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 30774cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 30784cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 30794cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 30804cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 30814cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 30824cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 30830a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 308409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30855c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 30865c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 308747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 30885c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3089e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3090e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 30915c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3092180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 30935c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3094180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3095180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 30965c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3097180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 30985c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3099b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3100b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 31015c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3102180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 31035c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31045c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 31055c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 31065c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31075c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3109e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3110e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3114e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 311547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 311649149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 311751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3118404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3120c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3121c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 31221aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Value; 3123efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 312409a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 312569ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3126efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 312747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 312847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 31291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 313047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 313183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 31320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3133efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3134efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3135efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 31361aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, Value); 3137efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3138650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3139650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 31402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3141e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3142e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3143e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3144e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 314583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 314683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 314783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3148e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3149e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 31500a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3153b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3154b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3155b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 31560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 31576a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 31582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 31596a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 31604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 31614efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3162c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 31631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3164650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 31658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3166180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3167efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 316856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 31698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 31704efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3171f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3172f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3173e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3174e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3175e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3176e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3177e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3178e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3179e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3180e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3181e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3182e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3183e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3184e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3185e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3186e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3187e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 31901aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 3191e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3192e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3193e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 319451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3195e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3196e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3197e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3198e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3199e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3200e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3201e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3202e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3203e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3204e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3205e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3206e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3207e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3208e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3209e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3210e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3211e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3212e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3213e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3214e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 321549149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 321651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3217e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3218e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3219e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3220e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3221e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3222e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3223e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3224e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3225e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3226e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3227e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3228e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3229e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3230e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3231e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3232f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3233e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3236f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3242e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3245e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3246e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3247e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3248f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3249e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3250e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3251e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3257e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3258e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3261180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3262180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3263180f47959a066795cc0f409433023af448bb0328Richard Smith 3264180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3265180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3266180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3267180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3268180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3269180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3270180f47959a066795cc0f409433023af448bb0328Richard Smith 3271180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3272180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3273180f47959a066795cc0f409433023af448bb0328Richard Smith 32741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 327583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 327683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3277180f47959a066795cc0f409433023af448bb0328Richard Smith } 327851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3279180f47959a066795cc0f409433023af448bb0328Richard Smith 328059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3281180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3282180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3283180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3284180f47959a066795cc0f409433023af448bb0328Richard Smith} 3285180f47959a066795cc0f409433023af448bb0328Richard Smith 328651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 328751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 328851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 328951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 329051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 329151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 329251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3293b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3294b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 329551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 329651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 329751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 329851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 329951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 330051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 33018d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 330251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 330351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 330451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 330551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 330651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3307b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 330851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 330951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 33108d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout)) 33118d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3312b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 331351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 331451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 331551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 331651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 331751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 332051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 3321262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie if (I->getType()->isReferenceType()) 332251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 332351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 332451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3325581deb3da481053c4993c7600f97acf7768caac5David Blaikie if (!HandleLValueMember(Info, E, Subobject, *I, &Layout)) 33268d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 332751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3328262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie ImplicitValueInitExpr VIE(I->getType()); 332983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3330262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Result.getStructField(I->getFieldIndex()), Info, Subobject, &VIE)) 333151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 333251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 333351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 333451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 333551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 333651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 333751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 333851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 33391de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (RD->isInvalidDecl()) return false; 334051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 334151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 334251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 334351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 334451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 334551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 334651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 334751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 334851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 334951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3350581deb3da481053c4993c7600f97acf7768caac5David Blaikie if (!HandleLValueMember(Info, E, Subobject, *I)) 33518d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3352581deb3da481053c4993c7600f97acf7768caac5David Blaikie Result = APValue(*I); 3353262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie ImplicitValueInitExpr VIE(I->getType()); 335483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 335551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 335651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3357ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 33585cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_virtual_base) << RD; 3359ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3360ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3361ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3362b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 336351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 336451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 336559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 336659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 336759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 336859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 336959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 337059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 337159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 337259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 337359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 337459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 33751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue DerivedObject; 3376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 337759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3378f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3379f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 338059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 338159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 338259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 338359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 338459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 338559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 338659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 338759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 338859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 338959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 339059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 339159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 339259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 339359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 339459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 339559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 339659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3397180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 339824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 339924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 340024fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 340124fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3402180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 34031de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (RD->isInvalidDecl()) return false; 3404180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3405180f47959a066795cc0f409433023af448bb0328Richard Smith 3406180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3407ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3408ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3409ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3410180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3411ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3412ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3413ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3414ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3415ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3416ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3417180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 34188d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout)) 34198d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 342083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3421180f47959a066795cc0f409433023af448bb0328Richard Smith } 3422180f47959a066795cc0f409433023af448bb0328Richard Smith 3423180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3424180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3425180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3426180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3427180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3428745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3429180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3430180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3431180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3432180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3433180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3434180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3435180f47959a066795cc0f409433023af448bb0328Richard Smith 3436180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3437180f47959a066795cc0f409433023af448bb0328Richard Smith 3438745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3439745f5147e065900267c85a5568785a1991d4838fRichard Smith 3440745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3441745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 34428d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, 3443581deb3da481053c4993c7600f97acf7768caac5David Blaikie Subobject, *Field, &Layout)) 34448d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3445745f5147e065900267c85a5568785a1991d4838fRichard Smith 3446745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3447745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3448745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3449745f5147e065900267c85a5568785a1991d4838fRichard Smith 345083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3451262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Result.getStructField(Field->getFieldIndex()), 3452745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3453745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3454180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3455745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3456180f47959a066795cc0f409433023af448bb0328Richard Smith } 3457180f47959a066795cc0f409433023af448bb0328Richard Smith } 3458180f47959a066795cc0f409433023af448bb0328Richard Smith 3459745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3460180f47959a066795cc0f409433023af448bb0328Richard Smith} 3461180f47959a066795cc0f409433023af448bb0328Richard Smith 3462180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3463180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 34641de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) return false; 34651de9d7de172379d6af75fd11dda2a713e4f36f62John McCall 346651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 346751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3468ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3469ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3470ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3471ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 347251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 347351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 347451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 34756180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 34766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 34776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 34786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 34796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 34806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 34816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 34826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 34836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3484180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3485180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3486180f47959a066795cc0f409433023af448bb0328Richard Smith 3487c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3488c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3489180f47959a066795cc0f409433023af448bb0328Richard Smith 3490610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 349151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3492180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3493180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3494180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3495180f47959a066795cc0f409433023af448bb0328Richard Smith 349651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 349751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 349851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3499cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko ArrayRef<const Expr *> Args(E->getArgs(), E->getNumArgs()); 3500745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3503180f47959a066795cc0f409433023af448bb0328Richard Smith} 3504180f47959a066795cc0f409433023af448bb0328Richard Smith 3505180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3506180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3507180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3508180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3509180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3510180f47959a066795cc0f409433023af448bb0328Richard Smith} 3511180f47959a066795cc0f409433023af448bb0328Richard Smith 3512180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3513e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3514e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3516e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3517e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3518e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3519e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3520e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3521e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3523e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3524e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3525e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3526e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3527e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 352883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 352983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3530e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3531e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3532e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3533e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3534e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3535e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3536e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3537e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3538e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3539e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3540e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3541e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3542e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3543e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3544e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3545e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3546e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3547e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3548e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3549e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3550e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3551e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3552e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3553e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3554e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3555af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3556e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3557e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3558e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3559e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 356059b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 356159b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 356259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 356359b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3564770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 356507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 356607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 356759b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 35681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 356907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 357007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 35711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 357207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 357307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 357407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 357507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 357607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 357707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 35781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 357969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 358007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 358107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 358207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 358351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 35841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 358507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 358691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 358707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 358807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 358907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 359091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 35912217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 359291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 359359b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 359459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 359559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 359659b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3597c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 359807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 359959b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 360059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 360107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 360207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3603c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 36041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3605d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3606e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 360759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 360846a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 360946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 361007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 361146a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 361246a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 361346a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 361507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 361646a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 361746a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 361846a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3619f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 362007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 362146a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 362207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 362346a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3624c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3625c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 362607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 362707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3628e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3629e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3630e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3631e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3632e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3633e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3634e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3635e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3636e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3637e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3638e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3639e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3640e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3641e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3642e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3643e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3644e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3645e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3646e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3647e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3648e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3649e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 36509ec55f24b8f848bb37a9971100cf2fca379d5572Tim Northover Elts.push_back(APValue(APFloat(Sem, Elt))); 3651e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3652e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3653e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3654e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3655e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3656e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3657e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3658e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3659e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3660e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3661e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3662e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3663e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3664e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3665e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 366646a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3667c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3668c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 366959b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 367059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 367107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 367259b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 367307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 367459b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 367591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 36761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 367759b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 36785f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 367959b5da6d853b4368b984700315adf7b37de05764Nate Begeman 36803edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 36813edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 36823edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 36833edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 36843edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 36853edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 36863edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 36873edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 36883edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 36893edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 36903edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 36913edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 36923edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 36933edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 36943edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 36953edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 36963edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 369759b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 36983edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 36993edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 37004b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37013edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 37023edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 37033edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 37043edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 370559b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 370659b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 37073edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37083edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 37094b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37103edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 37113edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 37123edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 37133edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 371459b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 37153edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 371659b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 371707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 371859b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 371959b5da6d853b4368b984700315adf7b37de05764Nate Begeman 372007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 372151201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 372207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 372391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 372491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 372591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 372691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 372791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 372891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 372991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 373091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 37315f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 373207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 373391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 373491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 373507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 37368327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 373751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 373891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 373991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 374059b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3741cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3742cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3743cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3744cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3745cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3746cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3747180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3748cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3749cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3750cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3751180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3752180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3753cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3754cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3755f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3756f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3757cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3758cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3759cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3760cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 376151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3762180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3763180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3764180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3765f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3766180f47959a066795cc0f409433023af448bb0328Richard Smith 3767180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3768180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3769180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3770180f47959a066795cc0f409433023af448bb0328Richard Smith 377151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3772180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3773b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3774180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 377583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3776180f47959a066795cc0f409433023af448bb0328Richard Smith } 3777180f47959a066795cc0f409433023af448bb0328Richard Smith 3778cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3780cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3781cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3782cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3783180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3784180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 378551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3786180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3787cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3788cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3789cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3790cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3791cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3792f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3793cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3794974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3795974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3796fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith if (E->isStringLiteralInit()) { 3797974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3798974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3799974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 38001aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 3801f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3802f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3803974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3804974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3805745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3806745f5147e065900267c85a5568785a1991d4838fRichard Smith 3807de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith assert((!Result.isArray() || Result.getArrayInitializedElts() == 0) && 3808de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith "zero-initialized array shouldn't have any initialized elts"); 3809de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith APValue Filler; 3810de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (Result.isArray() && Result.hasArrayFiller()) 3811de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Filler = Result.getArrayFiller(); 3812de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3813cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3814cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3815de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3816de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // If the array was previously zero-initialized, preserve the 3817de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // zero-initialized values. 3818de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!Filler.isUninit()) { 3819de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith for (unsigned I = 0, E = Result.getArrayInitializedElts(); I != E; ++I) 3820de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Result.getArrayInitializedElt(I) = Filler; 3821de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (Result.hasArrayFiller()) 3822de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Result.getArrayFiller() = Filler; 3823de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith } 3824de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3825180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3826b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3827180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3828cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3829180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 383083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 383183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3832745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3833745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3834745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3835745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3836745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3837745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3838180f47959a066795cc0f409433023af448bb0328Richard Smith } 3839cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3840745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3841cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3842180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3843180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3844180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3845180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 384683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 384783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3848cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3849cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3851de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3852de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // but sometimes does: 3853de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3854de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // S s[10]; 3855de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith LValue Subobject = This; 3856de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3857de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith APValue *Value = &Result; 3858de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith bool HadZeroInit = true; 3859a4334dffde250c22c339a974a7131914fe723180Richard Smith QualType ElemTy = E->getType(); 3860a4334dffde250c22c339a974a7131914fe723180Richard Smith while (const ConstantArrayType *CAT = 3861a4334dffde250c22c339a974a7131914fe723180Richard Smith Info.Ctx.getAsConstantArrayType(ElemTy)) { 3862de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Subobject.addArray(Info, E, CAT); 3863de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith HadZeroInit &= !Value->isUninit(); 3864de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!HadZeroInit) 3865de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3866de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!Value->hasArrayFiller()) 3867de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith return true; 3868de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Value = &Value->getArrayFiller(); 3869a4334dffde250c22c339a974a7131914fe723180Richard Smith ElemTy = CAT->getElementType(); 3870de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith } 3871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3872a4334dffde250c22c339a974a7131914fe723180Richard Smith if (!ElemTy->isRecordType()) 3873a4334dffde250c22c339a974a7131914fe723180Richard Smith return Error(E); 3874a4334dffde250c22c339a974a7131914fe723180Richard Smith 3875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 38766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 387751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 387851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3879ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3880ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3881ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 388251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 3883a4334dffde250c22c339a974a7131914fe723180Richard Smith ImplicitValueInitExpr VIE(ElemTy); 3884de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith return EvaluateInPlace(*Value, Info, Subobject, &VIE); 388551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 388651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 38876180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 38886180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 3889de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = APValue((FieldDecl*)0); 38906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 3891de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = 38926180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 38936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 38946180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 38956180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 38966180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3900c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3901c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3903ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 3904a4334dffde250c22c339a974a7131914fe723180Richard Smith ImplicitValueInitExpr VIE(ElemTy); 3905de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!EvaluateInPlace(*Value, Info, Subobject, &VIE)) 390651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 390751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 390851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3909cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko ArrayRef<const Expr *> Args(E->getArgs(), E->getNumArgs()); 3910745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3912de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Info, *Value); 3913e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3915cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3916f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3921f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3922f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3923f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3924770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 39258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 39261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Result; 3927f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 39281aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith IntExprEvaluator(EvalInfo &info, APValue &result) 39298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3930f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3931cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) { 3932973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 39332ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3934973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 39353f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3936973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39373f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39381aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(SI); 39393f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 39403f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 3941cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E) { 3942cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(SI, E, Result); 3943cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 39443f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3945cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) { 39462ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39472ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 394830c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39493f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39501aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(APSInt(I)); 3951575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3952575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3953131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3954131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3955cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E) { 3956cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(I, E, Result); 3957cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 3958131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3959cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 39602ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39612ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 39621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3963131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3964131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3965cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E) { 3966cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(Value, E, Result); 3967cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 3968131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 39694f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 39704f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 39714f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 39724f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 39731aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 39745930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3975342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3976342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3977342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 39788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 397932fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 39801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 398151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3982f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 39838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 39848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 39858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3986f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 39874c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3988131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39894c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 39904c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3991131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39924c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3993043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3994043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3995043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 39968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 39978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 39988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 39998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4000043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4001043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4002043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4003c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4004043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4005043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4008043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4009043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4011b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40128ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4013b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4014f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4016f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 40170518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 40183068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4019131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40203068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 40211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4022ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { 4023ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek return Success(E->getValue(), E); 4024ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } 4025ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek 4026f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 40273f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 402851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4029664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4030664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 403164b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 40320dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 403364b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 403464b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 40356ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 40366ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 40376ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 40386ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 40394ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor bool VisitTypeTraitExpr(const TypeTraitExpr *E) { 40404ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor return Success(E->getValue(), E); 40414ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor } 40424ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor 404321ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 404421ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 404521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 404621ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4047552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4048552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4049552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4050552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4051722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4052664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4053664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4054295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4055ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4056cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4057fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 40588b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 40598b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 40601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 40618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4062664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4063f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4064f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4065f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4066c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4067c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4068c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4069c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4070c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4071c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4072c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4073c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 40741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 407547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4076c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 40778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 407869ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 407969ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 40811aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 4082f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4084f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4085f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4086f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 40875cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 408830c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4089f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 409030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 409130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4092f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4093f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4095f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4096f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4097043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 40984c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4099bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4100973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4101973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4102973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4103973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4104973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4105973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4106973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4107973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4108973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4109973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4110973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4111973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4112973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4113973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4114973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4115973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4116973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4117bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41194c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41204c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4121a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4122a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4123a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4124a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 41257c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4126a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4127a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4128a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4129a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4130a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4131a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4132a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4133a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4134a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4135a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4136a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 41371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 41381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4139a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4140a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4141a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 41421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4143a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4144a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4145a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4146a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4147a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4148a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4149a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4150a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4151a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4152a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4153a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4154a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4155a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4156a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4157a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4158a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4159a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4160a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4161a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4162a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4163a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4164fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4165a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4166a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4167a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4168a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4169a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4170a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4171a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4172a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4173b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4174a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4175a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 417680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 417780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 417880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 417980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 418080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 418180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 418280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 41838e55ed1ad3acf9c7f8424aa7d326b3b2c18e943bDouglas Gregor const Expr *E = LV.getLValueBase().template dyn_cast<const Expr*>(); 418480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 418580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 418680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 418780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 418880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 418980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 419080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 419180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 419280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 419380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 419480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 419580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 419680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 419780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 419880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 419980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 420080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 420180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 420280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 420380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 420480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 420580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 420680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 420780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 420880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 420980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 421080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 421180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 421280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 421380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 421480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 421580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 421680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 421780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 421880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 421980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 422080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 422180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 422280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 422380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 422480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 422580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 422680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 422780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 422880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 422980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 423080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 423142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 423242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 42331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 42341bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 42351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 423642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 42371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 42381bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 42391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 424042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 424142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 424242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 424342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 424442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 424642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 4247c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith 4248c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith { 4249c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // The operand of __builtin_object_size is never evaluated for side-effects. 4250c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // If there are any, but we can determine the pointed-to object anyway, then 4251c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // ignore the side-effects. 4252c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith SpeculativeEvaluationRAII SpeculativeEval(Info); 4253c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith if (!EvaluatePointer(E->getArg(0), Base, Info)) 4254c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith return false; 4255c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith } 425642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 425742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 42581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 425942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 426142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 426242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 42631357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 426442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 426542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4266f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 426742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 426842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 426942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 427042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 427142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 427242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 427342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 427442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 42754f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 427642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 427742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 42792c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith switch (unsigned BuiltinOp = E->isBuiltinCall()) { 4280019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 42818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 428264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 428364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 428442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 428542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 428664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 42878ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // If evaluating the argument has side-effects, we can't determine the size 42888ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // of the object, and so we lower it to unknown now. CodeGen relies on us to 42898ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // handle all cases where the expression has side-effects. 4290393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4291a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4292cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 429364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 429464eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4295c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4296c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // Expression had no side effects, but we couldn't statically determine the 4297c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // size of the referenced object. 4298f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 429964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 430064eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4301d190057934331390ff67ebf51d66186dd5e392f0Benjamin Kramer case Builtin::BI__builtin_bswap16: 430270d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith case Builtin::BI__builtin_bswap32: 430370d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith case Builtin::BI__builtin_bswap64: { 430470d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith APSInt Val; 430570d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith if (!EvaluateInteger(E->getArg(0), Val, Info)) 430670d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith return false; 430770d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith 430870d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith return Success(Val.byteSwap(), E); 430970d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith } 431070d38f3179251bb3e7253a52bf54f8fa2314590aRichard Smith 4311019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4312131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 431480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 431580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4316e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 431721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4318a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4319bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 432021fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 432121fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4322c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4323c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4324c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 432540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43265726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 432740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 432880ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Info.getLangOpts().CPlusPlus11) 43295cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_function) 433040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 433140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 43325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 433340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43345726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43355726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43365726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43385726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43395726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43405726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43415f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 43425f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 43435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 43445726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 43455726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 43465726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 43475726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 43485726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4349f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4350454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 43512c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith case Builtin::BI__atomic_always_lock_free: 4352fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__atomic_is_lock_free: 4353fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__c11_atomic_is_lock_free: { 4354454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4355454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4356454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4357454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4358454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4359454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4360454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4361454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4362454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4363454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4364454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4365454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4366454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4367454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4368454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 43692c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size.isPowerOfTwo()) { 43702c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // Check against inlining width. 43712c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith unsigned InlineWidthBits = 43722c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 43732c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) { 43742c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free || 43752c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Size == CharUnits::One() || 43762c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith E->getArg(1)->isNullPointerConstant(Info.Ctx, 43772c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Expr::NPC_NeverValueDependent)) 43782c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline appropriately-aligned operations of this size, 43792c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // and _Atomic(T) is appropriately-aligned. 43802c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 43812c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith 43822c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()-> 43832c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith castAs<PointerType>()->getPointeeType(); 43842c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (!PointeeType->isIncompleteType() && 43852c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) { 43862c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline operations on this object. 43872c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 43882c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 43892c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 43902c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 4391454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 43922c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return BuiltinOp == Builtin::BI__atomic_always_lock_free ? 43932c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Success(0, E) : Error(E); 4394454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4395019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 43964c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4397f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4398625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4399625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4400625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4401625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4402625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4403625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4406625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4407625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4408625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4409625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44109a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4411625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4412625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4413625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4414625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 441583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4416625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4417625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44187b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44197b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44207b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44217b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44227b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44237b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44247b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44257b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44267b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44277b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44287b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44297b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 4430ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (Result.extend(BitWidth) != Value) { 4431ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (Info.getIntOverflowCheckMode()) 4432ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian Info.Ctx.getDiagnostics().Report(E->getExprLoc(), 4433ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian diag::warn_integer_constant_overflow) 4434ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian << Result.toString(10) << E->getType(); 4435ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian else 4436ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian HandleOverflow(Info, E, Value, E->getType()); 4437ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian } 44387b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44397b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44407b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4441cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisnamespace { 4442c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 4443cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// \brief Data recursive integer evaluator of certain binary operators. 4444cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// 4445cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// We use a data recursive algorithm for binary operators so that we are able 4446cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// to handle extreme cases of chained binary operators without causing stack 4447cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// overflow. 4448cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisclass DataRecursiveIntBinOpEvaluator { 4449cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct EvalResult { 4450cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue Val; 4451cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Failed; 4452cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4453cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult() : Failed(false) { } 4454cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4455cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void swap(EvalResult &RHS) { 4456cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Val.swap(RHS.Val); 4457cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Failed = RHS.Failed; 4458cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.Failed = false; 4459cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4460cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4461cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4462cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct Job { 4463cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *E; 4464cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult LHSResult; // meaningful only for binary operator expression. 4465cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind; 4466cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4467cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job() : StoredInfo(0) { } 4468cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void startSpeculativeEval(EvalInfo &Info) { 4469cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OldEvalStatus = Info.EvalStatus; 4470cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.Diag = 0; 4471cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo = &Info; 4472cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4473cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ~Job() { 4474cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (StoredInfo) { 4475cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo->EvalStatus = OldEvalStatus; 4476cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4477cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4478cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis private: 4479cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo *StoredInfo; // non-null if status changed. 4480cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Expr::EvalStatus OldEvalStatus; 4481cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4482cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4483cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SmallVector<Job, 16> Queue; 4484cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4485cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis IntExprEvaluator &IntEval; 4486cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &Info; 4487cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue &FinalResult; 4488cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4489cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 4490cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result) 4491cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { } 4492cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4493cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// \brief True if \param E is a binary operator that we are going to handle 4494cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// data recursively. 4495cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// We handle binary operators that are comma, logical, or that have operands 4496cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// with integral or enumeration type. 4497cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis static bool shouldEnqueue(const BinaryOperator *E) { 4498cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return E->getOpcode() == BO_Comma || 4499cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->isLogicalOp() || 4500cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis (E->getLHS()->getType()->isIntegralOrEnumerationType() && 4501cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4502cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4503cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4504cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Traverse(const BinaryOperator *E) { 4505cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(E); 4506cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult PrevResult; 4507b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu while (!Queue.empty()) 4508b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu process(PrevResult); 4509b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu 4510b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu if (PrevResult.Failed) return false; 4511cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4512cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis FinalResult.swap(PrevResult.Val); 4513cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4514a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4515a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4516cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisprivate: 4517cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 4518cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4519cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4520cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const APSInt &Value, const Expr *E, APValue &Result) { 4521cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4522cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4523cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E) { 4524cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E); 4525cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4526cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E, diag::kind D) { 4527cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E, D); 4528cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4529cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4530cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 4531cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Info.CCEDiag(E, D); 4532cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4533cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 45349293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis // \brief Returns true if visiting the RHS is necessary, false otherwise. 45359293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4536cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags); 45372fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4538cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4539cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result); 4540cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4541cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void EvaluateExpr(const Expr *E, EvalResult &Result) { 4542cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Failed = !Evaluate(Result.Val, Info, E); 4543cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (Result.Failed) 4544cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Val = APValue(); 4545cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4546cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4547b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu void process(EvalResult &Result); 4548cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4549cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void enqueue(const Expr *E) { 4550cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E = E->IgnoreParens(); 4551cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.resize(Queue.size()+1); 4552cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().E = E; 4553cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().Kind = Job::AnyExprKind; 4554cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4555cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis}; 4556cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4557cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4558cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4559cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 45609293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4561cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags) { 4562cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4563cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Ignore LHS but note if we could not evaluate it. 4564cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed) 4565cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4566cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4567cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4568cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4569cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4570cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult; 4571cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (HandleConversionToBool(LHSResult.Val, lhsResult)) { 45722fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We were able to evaluate the LHS, see if we can get away with not 45732fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 4574cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (lhsResult == (E->getOpcode() == BO_LOr)) { 45759293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis Success(lhsResult, E, LHSResult.Val); 45769293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS 45772fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 45782fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } else { 45792fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Since we weren't able to evaluate the left hand side, it 45802fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // must have had side effects. 45812fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4582cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4583cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 4584cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4585cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Don't ignore RHS and suppress diagnostics from this arm. 4586cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SuppressRHSDiags = true; 4587cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4588cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4589cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4590cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4591cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4592cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4593cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4594cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4595cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed && !Info.keepEvaluatingAfterFailure()) 45969293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS; 45979293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis 4598cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4599cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 46002fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4601cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 4602cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4603cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result) { 4604cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4605cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSResult.Failed) 4606cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4607cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSResult.Val; 4608cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4609cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4610cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4611cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4612cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult, rhsResult; 4613cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult); 4614cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult); 4615cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4616cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSIsOK) { 4617cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 4618cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_LOr) 4619cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult || rhsResult, E, Result); 4620cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4621cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult && rhsResult, E, Result); 4622cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4623cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else { 4624cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 46252fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 46262fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 46272fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (rhsResult == (E->getOpcode() == BO_LOr)) 4628cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(rhsResult, E, Result); 46292fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 46302fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4631cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 46322fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return false; 46332fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4634cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4635cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4636cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4637cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4638cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed || RHSResult.Failed) 4639cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4640cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4641cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &LHSVal = LHSResult.Val; 4642cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &RHSVal = RHSResult.Val; 4643cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4644cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like (unsigned long)&a + 4. 4645cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4646cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = LHSVal; 4647cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CharUnits AdditionalOffset = CharUnits::fromQuantity( 4648cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.getInt().getZExtValue()); 4649cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add) 4650cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += AdditionalOffset; 4651cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4652cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() -= AdditionalOffset; 4653cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4654cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4655cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4656cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like 4 + (unsigned long)&a 4657cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add && 4658cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.isLValue() && LHSVal.isInt()) { 4659cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSVal; 4660cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += CharUnits::fromQuantity( 4661cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHSVal.getInt().getZExtValue()); 4662cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4663cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4664cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4665cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 4666cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle (intptr_t)&&A - (intptr_t)&&B. 4667cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.getLValueOffset().isZero() || 4668cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSVal.getLValueOffset().isZero()) 4669cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4670cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 4671cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 4672cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSExpr || !RHSExpr) 4673cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4674cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 4675cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 4676cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSAddrExpr || !RHSAddrExpr) 4677cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4678cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Make sure both labels come from the same function. 4679cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSAddrExpr->getLabel()->getDeclContext() != 4680cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSAddrExpr->getLabel()->getDeclContext()) 4681cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4682cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = APValue(LHSAddrExpr, RHSAddrExpr); 4683cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4684cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4685cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4686cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // All the following cases expect both operands to be an integer 4687cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.isInt() || !RHSVal.isInt()) 4688cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4689cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4690cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APSInt &LHS = LHSVal.getInt(); 4691cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APSInt RHS = RHSVal.getInt(); 4692cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4693cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (E->getOpcode()) { 4694cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis default: 4695cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4696cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Mul: 4697cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4698cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() * 2, 4699cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::multiplies<APSInt>()), E, 4700cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4701cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Add: 4702cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4703cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4704cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::plus<APSInt>()), E, Result); 4705cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Sub: 4706cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4707cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4708cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::minus<APSInt>()), E, Result); 4709cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_And: return Success(LHS & RHS, E, Result); 4710cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Xor: return Success(LHS ^ RHS, E, Result); 4711cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Or: return Success(LHS | RHS, E, Result); 4712cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Div: 4713cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Rem: 4714cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS == 0) 4715cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E, diag::note_expr_divide_by_zero); 4716cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is 4717cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // not actually undefined behavior in C++11 due to a language defect. 4718cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isNegative() && RHS.isAllOnesValue() && 4719cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.isSigned() && LHS.isMinSignedValue()) 4720cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 4721cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E, 4722cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4723cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shl: { 47247a83421776416d6a9044fb03b5b02208b47646c1David Tweed if (Info.getLangOpts().OpenCL) 47257a83421776416d6a9044fb03b5b02208b47646c1David Tweed // OpenCL 6.3j: shift values are effectively % word size of LHS. 4726a52d278f0fbac83fa26a03948759cce467d8e55bJoey Gouly RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), 47277a83421776416d6a9044fb03b5b02208b47646c1David Tweed static_cast<uint64_t>(LHS.getBitWidth() - 1)), 47287a83421776416d6a9044fb03b5b02208b47646c1David Tweed RHS.isUnsigned()); 47297a83421776416d6a9044fb03b5b02208b47646c1David Tweed else if (RHS.isSigned() && RHS.isNegative()) { 47307a83421776416d6a9044fb03b5b02208b47646c1David Tweed // During constant-folding, a negative shift is an opposite shift. Such 47317a83421776416d6a9044fb03b5b02208b47646c1David Tweed // a shift is not a constant expression. 4732cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4733cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4734cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_right; 4735cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4736cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4737cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_left: 4738cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of 4739cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // the shifted type. 4740cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4741cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) { 4742cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4743cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4744cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else if (LHS.isSigned()) { 4745cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4746cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // operand, and must not overflow the corresponding unsigned type. 4747cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHS.isNegative()) 4748cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4749cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else if (LHS.countLeadingZeros() < SA) 4750cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_discards); 4751cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4752cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4753cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS << SA, E, Result); 4754cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4755cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shr: { 47567a83421776416d6a9044fb03b5b02208b47646c1David Tweed if (Info.getLangOpts().OpenCL) 47577a83421776416d6a9044fb03b5b02208b47646c1David Tweed // OpenCL 6.3j: shift values are effectively % word size of LHS. 4758a52d278f0fbac83fa26a03948759cce467d8e55bJoey Gouly RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), 47597a83421776416d6a9044fb03b5b02208b47646c1David Tweed static_cast<uint64_t>(LHS.getBitWidth() - 1)), 47607a83421776416d6a9044fb03b5b02208b47646c1David Tweed RHS.isUnsigned()); 47617a83421776416d6a9044fb03b5b02208b47646c1David Tweed else if (RHS.isSigned() && RHS.isNegative()) { 47627a83421776416d6a9044fb03b5b02208b47646c1David Tweed // During constant-folding, a negative shift is an opposite shift. Such a 47637a83421776416d6a9044fb03b5b02208b47646c1David Tweed // shift is not a constant expression. 4764cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4765cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4766cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_left; 4767cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4768cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4769cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_right: 4770cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4771cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // shifted type. 4772cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4773cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) 4774cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4775cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4776cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4777cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS >> SA, E, Result); 4778cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4779cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4780cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LT: return Success(LHS < RHS, E, Result); 4781cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GT: return Success(LHS > RHS, E, Result); 4782cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LE: return Success(LHS <= RHS, E, Result); 4783cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GE: return Success(LHS >= RHS, E, Result); 4784cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_EQ: return Success(LHS == RHS, E, Result); 4785cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_NE: return Success(LHS != RHS, E, Result); 4786cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4787cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4788cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4789b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieuvoid DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) { 4790cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job &job = Queue.back(); 4791cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4792cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (job.Kind) { 4793cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::AnyExprKind: { 4794cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) { 4795cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (shouldEnqueue(Bop)) { 4796cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpKind; 4797cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getLHS()); 4798b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4799cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4800cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4801cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4802cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvaluateExpr(job.E, Result); 4803cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4804b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4805cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4806cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4807cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpKind: { 4808cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4809cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool SuppressRHSDiags = false; 48109293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) { 4811cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4812b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4813cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4814cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SuppressRHSDiags) 4815cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.startSpeculativeEval(Info); 48169293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis job.LHSResult.swap(Result); 4817cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpVisitedLHSKind; 4818cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getRHS()); 4819b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4820cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4821cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4822cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpVisitedLHSKind: { 4823cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4824cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult RHS; 4825cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.swap(Result); 4826b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val); 4827cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4828b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4829cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4830cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4831cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4832cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis llvm_unreachable("Invalid Job::Kind!"); 4833cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4834cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4835cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4836cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAssignmentOp()) 4837cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4838cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4839cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E)) 4840cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E); 484154176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4842286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4843286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 48444087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48454087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 48464087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4847f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 48484087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4849745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4850745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 48514087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48524087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4853745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 48544087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48554087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48564087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 48571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 48584087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 48591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 48604087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 48614087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4863131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4864131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4865131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4867131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 48681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4869fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4870fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 48711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4872fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4873fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4874131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48754087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 48762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4877131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4878131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4879131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4881131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4882131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4883131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4884131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48854087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48864087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4888286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4889286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4890286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 48911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4892745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4893745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4894286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 48951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4896745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4897286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 48981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4899286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4900529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4901286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4902286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4903b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 49042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4905131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 49062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4907131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 49082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4909131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 49102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 49111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4912131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 49132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4914131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 49152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 49161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4917fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4918fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4919286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4920286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 49211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4922ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4923625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4924745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4925745f5147e065900267c85a5568785a1991d4838fRichard Smith 4926745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4927745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 49283068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4929a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4930745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 49313068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4932a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4933625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4934625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4935625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 493665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 493765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 493865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 493965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 494065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 49417b2f93c8b63f59d429731aaf16d14f0cd32f98c8Benjamin Kramer const Expr *RHSExpr = RHSValue.Base.dyn_cast<const Expr*>(); 494265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 494365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 494465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 494565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 494665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 494765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 49485930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 49495930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 49505930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 49515930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 49521aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 495365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 495465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 49559e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 49569e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 49575bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4958f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4959ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4960ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4961c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4962ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4963ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4964f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49659e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4966b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4967b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4968b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 496974f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 497074f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4971f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49729e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 49739e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 49749e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4975f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49769e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4977c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4978c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4979c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 49809e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 49815bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4982a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 498315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 498415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 498515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4986f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4987f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4988f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 49892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4990f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4991f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4992f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4993f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4994f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4995f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4996f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4997f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4998f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 49994992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 50004992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 50013068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 5002180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 500374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 5004180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5005a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 500615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 500715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 500815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 500915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 501015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 501115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 501215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 501315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 501415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 501515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 501615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 501715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 501815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 501915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 502015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 502115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 502215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 502315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 502415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 502515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 5026ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 5027625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 502882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 502982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 503082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 503182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 503282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 503382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 503482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 503582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 5036f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 503782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 503882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 5039f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 5040f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 5041f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 5042f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 5043f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 5044f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 5045f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 5046f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 5047f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 5048f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 5049f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 5050f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 5051f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 5052f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 5053f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 5054f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 5055f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 5056f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 5057f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 5058f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 5059f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 5060f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 5061f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 5062f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 5063f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 5064f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 5065f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 5066f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5067f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 5068f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 5069f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 5070f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5071f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 5072f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 5073f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 5074f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 5075f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 5076f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 5077f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 5078f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5079f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5080f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 5081a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // The comparison here must be unsigned, and performed with the same 5082a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // width as the pointer. 5083a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy); 5084a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareLHS = LHSOffset.getQuantity(); 5085a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareRHS = RHSOffset.getQuantity(); 5086a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman assert(PtrSize <= 64 && "Unexpected pointer width"); 5087a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t Mask = ~0ULL >> (64 - PtrSize); 5088a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareLHS &= Mask; 5089a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareRHS &= Mask; 5090a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman 50912850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // If there is a base and this is a relational operator, we can only 50922850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // compare pointers within the object in question; otherwise, the result 50932850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // depends on where the object is located in memory. 50942850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (!LHSValue.Base.isNull() && E->isRelationalOp()) { 50952850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman QualType BaseTy = getType(LHSValue.Base); 50962850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (BaseTy->isIncompleteType()) 50972850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 50982850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy); 50992850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman uint64_t OffsetLimit = Size.getQuantity(); 51002850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit) 51012850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 51022850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman } 51032850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman 5104625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 5105625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 5106a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LT: return Success(CompareLHS < CompareRHS, E); 5107a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GT: return Success(CompareLHS > CompareRHS, E); 5108a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LE: return Success(CompareLHS <= CompareRHS, E); 5109a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GE: return Success(CompareLHS >= CompareRHS, E); 5110a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_EQ: return Success(CompareLHS == CompareRHS, E); 5111a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_NE: return Success(CompareLHS != CompareRHS, E); 5112ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 51133068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 51143068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 5115b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5116b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 5117b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 5118b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 5119b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5120b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 5121b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5122b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 5123b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 5124b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5125b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5126b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 5127b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5128b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5129b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 5130b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 5131b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 5132b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 5133b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 5134b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5135b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5136b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5137b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 5138b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 5139b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 5140b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5141b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5142b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 5143b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5144b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5145b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5146b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 5147b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 5148b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 5149b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 5150b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 5151b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5152b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5153b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 515426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 515526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 515626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 515726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 515826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 515926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 516026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 516126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 516226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 516326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 5164cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert((!LHSTy->isIntegralOrEnumerationType() || 5165cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSTy->isIntegralOrEnumerationType()) && 5166cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis "DataRecursiveIntBinOpEvaluator should have handled integral types"); 5167cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't continue from here for non-integral types. 5168cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 5169a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 5170a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 51718b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 51725d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 51735d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 51745d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 51755d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 51769f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 51779f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 51789f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 51799f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 5180e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5181e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 51828b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 5183af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 5184af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5185af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 51861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 5187af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 51888b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 51898b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5190a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5191af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 51928b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 51938b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5194af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5195e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 5196e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5197e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5198e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5199f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 5200f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 5201f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 5202f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 5203f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 5204f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 5205e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 52064f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 5207e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 52084f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 5209e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 5210a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5211f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 5212f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 52130518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 5214f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 5215890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek unsigned n = Ty->castAs<VectorType>()->getNumElements(); 5216a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5217f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 5218f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 5219f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5220f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5221f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5222f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5223f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5224f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5225f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5226f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5227f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5228f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5229f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5230f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5231f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5232f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5233f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5234180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 523574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5236f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5237180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5238f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5239f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5240f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5241f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5242fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5243fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 52448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 52458ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 52468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 52478ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5248f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 52508ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 52518ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 52528ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 52538ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 52548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 52558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 52568ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 52578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 52588ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 52598ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5260f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52618ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 52628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 52638ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 52648ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5266f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52678ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 52688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 52698ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5270f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5271f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52728ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 52738d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 52748ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5275ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5276cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5277fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 52788ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 52798ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52808ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5281f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52828ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 52838ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5284f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5285cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5286cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5287cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5288f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5289cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5290cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5291cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5292f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5294cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 52958d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 5296cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5297cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5298cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5299cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5300cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5301cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5303cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5304cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 53057c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5306cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5307cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 53088ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 53098ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 53108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 53118ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 53128ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5313b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 531475a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 53154c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 531675a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 531775a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5318f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 53192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 53204c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 53214c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5322f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 53232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5324c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5325f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5326f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5327f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5328f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5329f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5330789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5331789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5332789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5333789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5334789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5335f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5336f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5337f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5338f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5339f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5340f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5341f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5342f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5343f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5344f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5345f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5346f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5347f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 534806a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5349a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 53501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5351732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5352732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 53538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 53548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 535582206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5356b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 535782206e267ce6cc709797127616f64672d255b310Anders Carlsson 535846a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 535946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 536046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 536146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 536246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 536346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 536446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 536546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 536646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 536746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 536846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 536946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 53704d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 537146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 537246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 537346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 537446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 537546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 537646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 53771d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 53781d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 537946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 538046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 538146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 538246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 538346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 538446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 538546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 538646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 538746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 5388a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: 5389e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ZeroToOCLEvent: 539046a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 539146a523285928aa07bf14803178dc04616ac85994Eli Friedman 5392e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 539346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 539446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 539533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 539633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 539733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 539833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5399ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5400f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 540146a523285928aa07bf14803178dc04616ac85994Eli Friedman 54027d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 540346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 54047a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 54057a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 540646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5407c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 540846a523285928aa07bf14803178dc04616ac85994Eli Friedman 540946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 541046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 541146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 541246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 541346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 541446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 54154efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5416c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 54174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5418131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 54194efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 54204efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 542146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5422732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5423b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5424a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5425be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 542665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 542765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 542865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 542965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 543065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 543165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 543265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5433be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5434be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5435be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 543630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5437f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5438f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5439732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 54401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 544146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5442c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5443c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5444efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 544587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5446b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 54474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5448dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5449dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5450f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5451f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5452f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5453dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5454f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5455dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5456b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5457efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5458dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5459dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 54604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5461a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5462a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5463f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 54642bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 54654efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 546646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5467f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 54681725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 54691725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 547046a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 54711725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 54722217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 547346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 547446a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 547546a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 547646a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5477732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5478c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5480c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 548246a523285928aa07bf14803178dc04616ac85994Eli Friedman } 548346a523285928aa07bf14803178dc04616ac85994Eli Friedman } 54841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 548546a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5486a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 54872bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5488722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5489722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5490f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5491f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5492f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5493f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5494f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5495722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5496722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5497722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5498722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5499722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5500722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5501664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5502722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5503f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5505f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5506f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5507f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5508722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5509722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5510722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 55118327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5512664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5513664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5514664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5515ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5516ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5517ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5518ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5519295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5520295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5521295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5522295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5523f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5524d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5525d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5526d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5527d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5528770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 55298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5530d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5531d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5532d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 55338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5534d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 55368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 55378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5539d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 554051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5541f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5542f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5543f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5544f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5545019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5546d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55475db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5548d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5549d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 55508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 55512217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5552abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5553abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5554ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 555551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5556d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5557d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5558d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5559d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5560c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 55618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5562d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5563d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55644ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5565db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5566db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5567db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5568db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5569db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5570db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5571db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5572db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5573db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5574db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5575db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5576db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5577db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5578db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5579db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5580db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5581db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5582db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5583db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5584db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5585db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5586db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5587db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5588db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5589019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5590180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 55918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 55928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 55938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5594019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5595019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5596019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5597019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5598019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 55997cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 56007cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 56017cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 560234a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 560334a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 56047cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 56051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5606db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5607db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5608db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5613db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 56149e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 56159e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 56169e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 56174572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 56189e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5619f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5620f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5621f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 56235db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 56245db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 56255db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 56265db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 56275db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 56285db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 56291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56305db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 56315db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56325db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56335db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 56341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 56351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 56365db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 56375db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 56385db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 56395db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 56405db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 56415db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 56425db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56435db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5644019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5645019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5646019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5647abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 564843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 564943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 565043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 565143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 565243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 565343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 565443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 565543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 565643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5657abd3a857ace59100305790545d1baae5877b8945John McCall} 5658abd3a857ace59100305790545d1baae5877b8945John McCall 5659abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 566043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 566143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 566243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 566343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 566443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 566543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 566643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 566743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 56688327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 566943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 567043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5671abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5672abd3a857ace59100305790545d1baae5877b8945John McCall} 5673abd3a857ace59100305790545d1baae5877b8945John McCall 56745db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 56755db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5676f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 56772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 56787993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 56792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 56807993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 56817993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 56825db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56835db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56845db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 56855db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5686019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5687d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 569096e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 56915db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5692745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5693745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5694d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5695745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5696d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5697d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5698d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5699f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5701d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 57027b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5704d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 57057b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5707d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 57087b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5710d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 57117b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5712d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 57137b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 57147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 57157b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 57167b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5717d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5718d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5719d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5720d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5721d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5722d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5723d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 57248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 57258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 57261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57272a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 57282a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5729c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 57302a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57312a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 57324efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5733c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5734c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5735c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 57364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 57372a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57382a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 57394efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 57404efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5741c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5742c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 57434efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5744f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 57452a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5746f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5747f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5748f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5749f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5750f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5751f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 57522a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 57534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 57544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5755d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5756a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 57579ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 57589ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57599ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5760770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 57618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5762f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 57631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57649ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5765f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 57668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 57671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57681aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 57698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 57708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 57718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 57721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 57747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 57758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 57778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57789ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 57808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5781b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 578296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 57837ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5784b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5785b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 57861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5787b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5788b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5789c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 57908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5791b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5792b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 57937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5794890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType(); 57957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 57967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 57977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 57987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 57997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 58007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 58017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 58027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 58037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 58047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 58057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 58077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 58087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 58098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 58108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5811b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5812b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5813b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5814b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5815b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5816b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5817b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5818b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5819b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5820b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5821b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5822b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5823b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5824b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5825b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5826b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5827b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5828b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5829b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5830b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5831b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5832b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5833b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5835b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 58378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 58388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 58398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 58408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 58418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 58428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 58438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 58448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 58458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 58468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 58478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 58488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 58498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 58504d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 58518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 58528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 58538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 58548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 58558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 58568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 58578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 58588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 58598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 58608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 58618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 58628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 58631d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 58641d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 58658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 58668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 58678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 58688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 58698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 58708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 587133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 587233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 587333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 587433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5875ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5876a6c66cedc022c9e5d45a937d6b8cff491a6bf81bEli Friedman case CK_BuiltinFnToFnPtr: 5877e6b9d802fb7b16d93474c4f1c179ab36202e8a8bGuy Benyei case CK_ZeroToOCLEvent: 58788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 58798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 58817a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 58827a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 58838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5884c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 58852bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 58868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 588746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 58888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5889f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 58908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58918786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5892b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 58938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5894b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5895b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58968786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 58978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 58988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 58998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 59028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5909c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5910c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 59118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 59148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5921c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5922c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5923c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5924c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 59258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5928b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 59298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5930b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 59319ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 59328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 59338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 59348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 59388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5939b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5940ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 59418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59441725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5945f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5946f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 59478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 59518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5954890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType To = E->getType()->castAs<ComplexType>()->getElementType(); 59558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 5956890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); 59578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5958c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5959c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5960c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5961c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 59628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5963ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 59641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 59658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 59669ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 59679ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5968f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 59702ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 59712ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5972745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5973745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5974f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 59751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5976f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5977745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5978f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5979a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 59803f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 59813f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5982ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5983f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 59842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5985a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5986a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5987a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5988a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5989a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5990a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5991a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5992a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5993a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 59943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 59952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5996a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5997a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5998a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5999a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 6000a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 6001a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 6002a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 6003a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 6004a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 60053f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 60062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 60073f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 6008f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 60093f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 60103f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 60113f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 60123f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 60131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 60143f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 60153f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 60163f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 60173f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 60183f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 60193f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 60203f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 60213f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 60223f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 60233f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 60243f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 60253f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 60263f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 60273f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 6028f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 60291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 60303f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 60313f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 60321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 60333f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 60343f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 60353f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 60363f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 603796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 603896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 603996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 604096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 604196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 604296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 604396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 604496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 604596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 604696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 604796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 604896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 604996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 605096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 605196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 605296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 605396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 605496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 605596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 605696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 605796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 605896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 605996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 606096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 606196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 606296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 606396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 606496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 606596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 606696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 6067f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 6068f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 6069f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 607096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 607196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 607296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 607396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 607496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 607596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 607696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 607796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 607896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 607996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 608096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 6081ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 6082ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 6083f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 6084ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 6085ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 608696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 608796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 608896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 608996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 609096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 609196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 609296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 6093f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 609496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 609596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 609696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 609796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 609896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 609996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 610096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 610196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 610296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 610396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 610496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 610596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 610696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 610796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 610896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 610996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 611096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 611196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 611296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 611396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 611496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 611596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 611696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 611796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 61187ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 61197ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 61207ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 61217ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 61227ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 61237ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61247ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 61257ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61267ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 61277ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 61287ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 61297ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61307ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 61317ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61327ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61337ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 61347ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61357ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 61367ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 61377ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 61389ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 6139aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 6140aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 6141aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 6142aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6143aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 6144aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 6145aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 6146aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 6147aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 6148aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 61491aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { return true; } 6150aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6151aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 6152aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 6153aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 6154aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 6155aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 6156aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 6157aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 6158aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6159aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6160aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 6161aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 6162aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6163aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 6164aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 6165aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 6166aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 6167aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6168aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 616951f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 6170f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 6171f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 61721aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { 6173c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 6174c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 6175c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 6176c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 6177c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 6178c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6179c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 6180c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 61811e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 618259b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 6183575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 61841e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 61856dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 6186efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 6187efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 6188efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 61896dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61901e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 6191efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 6192efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 6193efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 61946dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61951aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(F); 6196efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 6197efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 6198efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 6199660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 62001e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 620169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 6202e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 6203e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 6204e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 6205e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 6206e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 620751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 6208180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 620983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6210180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6211cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 6212180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 621351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 6214180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 621583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6216180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6217180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 6218180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 6219aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 622080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (!Info.getLangOpts().CPlusPlus11) 62215cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_nonliteral) 6222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 6223aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6224aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 622580ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith } else if (Info.getLangOpts().CPlusPlus11) { 62265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) << E->getType(); 6227c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6228f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 62295cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 6230660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6231f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6232660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6233660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6234660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6235660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 623683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 623783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 623883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 623983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 624083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 624183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 62427ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 624351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 624451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 624551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 624669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 624769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6248180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6249180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6250180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6251180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 625269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 625369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 625469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 62551aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return Evaluate(Result, Info, E); 625669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 625769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6258f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6259f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6260f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 626151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 626251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 626351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 62641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!::Evaluate(Result, Info, E)) 6265f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6266f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6267f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6268f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 62691aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.setFrom(Info.Ctx, Result); 62701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) 6271f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6272f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6273f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 62741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith // Check this core constant expression is a constant expression. 627583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6276f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6277c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 6278ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanianstatic bool FastEvaluateAsRValue(const Expr *Exp, Expr::EvalResult &Result, 6279ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian const ASTContext &Ctx, bool &IsConst) { 6280ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6281ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6282ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(Exp)) { 6283ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6284ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6285ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian IsConst = true; 6286ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6287ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6288ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 62892d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 62902d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6291ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (Exp->isRValue() && (Exp->getType()->isArrayType() || 6292ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian Exp->getType()->isRecordType()) && 6293ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian !Ctx.getLangOpts().CPlusPlus11) { 6294ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian IsConst = false; 6295ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian return true; 6296ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian } 6297ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian return false; 6298ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian} 6299ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 63001445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6301ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian/// EvaluateAsRValue - Return true if this is a constant which we can fold using 6302ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian/// any crazy technique (that has nothing to do with language standards) that 6303ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian/// we want to. If this function returns true, it returns the folded constant 6304ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6305ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian/// will be applied to the result. 6306ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanianbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6307ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian bool IsConst; 6308ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (FastEvaluateAsRValue(this, Result, Ctx, IsConst)) 6309ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian return IsConst; 6310ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 6311f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6312f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 631356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 631456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 63154ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 63164ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6317c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 631851f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 63191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith HandleConversionToBool(Scratch.Val, Result); 6320cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6321cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 632280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 632380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 632480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 632580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 632680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6327c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 632880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 632980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6330c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6331f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6332c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6333c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6334a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6335a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 63364ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 63371b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 63381b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6339efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 634083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 634183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 634283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 634383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 634483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 63451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.moveInto(Result.Val); 634683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6347b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6348b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6349099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6350099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6351cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 63522d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 63532d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 63542d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 635580ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith !Ctx.getLangOpts().CPlusPlus11) 63562d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 63572d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6358099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6359099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6360099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6361099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6362099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6363099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6364099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6365099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6366099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 636751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 636851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 636951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 637051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 63714e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() && 637251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 637351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 637483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 637583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 637651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 637751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 637851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 637983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 638083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 638183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 638283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 638383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 638483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 638583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6386099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6387099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 638851f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 638951f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 63904ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 63914fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 639251f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 639345b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 639451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 6395a18e70b25c85d7e653e642b5e6e58d6063af3d83Fariborz JahanianAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx, 6396cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVectorImpl<PartialDiagnosticAt> *Diag) const { 63971c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 6398a18e70b25c85d7e653e642b5e6e58d6063af3d83Fariborz Jahanian EvalResult.Diag = Diag; 639951f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6400c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 640151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 64021c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 640351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 64041c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 640551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6406d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6407ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanianvoid Expr::EvaluateForOverflow(const ASTContext &Ctx, 6408ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian SmallVectorImpl<PartialDiagnosticAt> *Diags) const { 6409ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian bool IsConst; 6410ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian EvalResult EvalResult; 6411ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian EvalResult.Diag = Diags; 6412ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian if (!FastEvaluateAsRValue(this, EvalResult, Ctx, IsConst)) { 6413ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian EvalInfo Info(Ctx, EvalResult, true); 6414ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian (void)::EvaluateAsRValue(Info, this, EvalResult.Val); 6415ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian } 6416ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian} 6417ad48a500596d7d678b99c7f94326cfa856c3b49fFariborz Jahanian 6418e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6419e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6420e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6421e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6422e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6423e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6424d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6426d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6427d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6428d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6429d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6430d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6431ceb59d91b3a7def4297ec8468621805777741963Richard Smith// ICEDiag contains an ICEKind indicating whether the expression is an ICE, 6432ceb59d91b3a7def4297ec8468621805777741963Richard Smith// and a (possibly null) SourceLocation indicating the location of the problem. 6433ceb59d91b3a7def4297ec8468621805777741963Richard Smith// 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6435d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6436d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6437d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6438d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64393c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 64403c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6441ceb59d91b3a7def4297ec8468621805777741963Richard Smithenum ICEKind { 6442ceb59d91b3a7def4297ec8468621805777741963Richard Smith /// This expression is an ICE. 6443ceb59d91b3a7def4297ec8468621805777741963Richard Smith IK_ICE, 6444ceb59d91b3a7def4297ec8468621805777741963Richard Smith /// This expression is not an ICE, but if it isn't evaluated, it's 6445ceb59d91b3a7def4297ec8468621805777741963Richard Smith /// a legal subexpression for an ICE. This return value is used to handle 6446ceb59d91b3a7def4297ec8468621805777741963Richard Smith /// the comma operator in C99 mode, and non-constant subexpressions. 6447ceb59d91b3a7def4297ec8468621805777741963Richard Smith IK_ICEIfUnevaluated, 6448ceb59d91b3a7def4297ec8468621805777741963Richard Smith /// This expression is not an ICE, and is not a legal subexpression for one. 6449ceb59d91b3a7def4297ec8468621805777741963Richard Smith IK_NotICE 6450ceb59d91b3a7def4297ec8468621805777741963Richard Smith}; 6451ceb59d91b3a7def4297ec8468621805777741963Richard Smith 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6453ceb59d91b3a7def4297ec8468621805777741963Richard Smith ICEKind Kind; 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6455d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6456ceb59d91b3a7def4297ec8468621805777741963Richard Smith ICEDiag(ICEKind IK, SourceLocation l) : Kind(IK), Loc(l) {} 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6458d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64593c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 64603c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6461ceb59d91b3a7def4297ec8468621805777741963Richard Smithstatic ICEDiag NoDiag() { return ICEDiag(IK_ICE, SourceLocation()); } 6462ceb59d91b3a7def4297ec8468621805777741963Richard Smith 6463ceb59d91b3a7def4297ec8468621805777741963Richard Smithstatic ICEDiag Worst(ICEDiag A, ICEDiag B) { return A.Kind >= B.Kind ? A : B; } 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6465d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6466d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 646751f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6468ceb59d91b3a7def4297ec8468621805777741963Richard Smith !EVResult.Val.isInt()) 6469ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6470ceb59d91b3a7def4297ec8468621805777741963Richard Smith 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6473d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6474d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 6476ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) 6477ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6478d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6479d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 648063c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6483d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6484d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6485d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6486d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6487d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6488d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6490d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6495d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6496d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6497d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6498d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6500e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6501d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6502d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 65039be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6504d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 65059fcce65e7e1307b5b8da9be13e4092d6bb94dc1dRichard Smith case Expr::UserDefinedLiteralClass: 6506d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6507d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6508d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6509d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6510d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6511d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6512d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6513d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6514d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 65154765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6516d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6517d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6518d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6519d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6520d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6521eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard case Expr::ObjCBoxedExprClass: 6522ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCArrayLiteralClass: 6523ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCDictionaryLiteralClass: 6524d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6525d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6526d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6527d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6528d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6529d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6530ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCSubscriptRefExprClass: 6531d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 65357cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6536be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6537c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 65389a4db032ecd991626d236a502e770126db32bd31Richard Smith case Expr::FunctionParmPackExprClass: 653961eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6540f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 654103e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 65424b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6543276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6544cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 654501d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6546ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6547cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6548ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6549d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6550d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6551d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6552d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 655391a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 655491a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 655591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 655691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6557d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6558d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6559f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6560f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6561d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6562d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6563ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCBoolLiteralExprClass: 6564d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6565ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6566d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 65676ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 65684ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor case Expr::TypeTraitExprClass: 656921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6570552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 65712e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6572d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6573d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 65746cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 657505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 657605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 657705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6578d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6579180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6580d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6581ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6582d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6583359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith case Expr::DeclRefExprClass: { 6584d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6586359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith const ValueDecl *D = dyn_cast<ValueDecl>(cast<DeclRefExpr>(E)->getDecl()); 65874e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && 6588359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith D && IsConstNonVolatile(D->getType())) { 6589d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6590d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6591d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6592d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6593ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); 6594d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6595d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6596d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6597d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6598d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6599db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6600ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); 6601db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6602099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6603099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6604099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6605099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6606099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6607099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6608ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); 6609d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6610d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6611ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6612359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith } 6613d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6614d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 66162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 66172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 66182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 66192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 66202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 66212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 662205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 662305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 662405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6625ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 66262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 66272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 66282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 66292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 66302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 66312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 66322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6633d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6634d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6635ceb59d91b3a7def4297ec8468621805777741963Richard Smith 6636d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6637d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6638d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6639ceb59d91b3a7def4297ec8468621805777741963Richard Smith // Note that per C99, offsetof must be an ICE. And AFAIK, using 6640ceb59d91b3a7def4297ec8468621805777741963Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 6641ceb59d91b3a7def4297ec8468621805777741963Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6642ceb59d91b3a7def4297ec8468621805777741963Richard Smith // compliance: we should warn earlier for offsetof expressions with 6643ceb59d91b3a7def4297ec8468621805777741963Richard Smith // array subscripts that aren't ICEs, and if the array subscripts 6644ceb59d91b3a7def4297ec8468621805777741963Richard Smith // are ICEs, the value of the offsetof must be an integer constant. 6645ceb59d91b3a7def4297ec8468621805777741963Richard Smith return CheckEvalInICE(E, Ctx); 6646d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6647f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6648f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6649f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6650f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6651ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6652d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6653d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6654d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6655d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6656d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 66572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 66582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 66592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 66602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 66612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 66622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 66632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 66642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 66652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 66662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 66672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 66682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 66692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 667005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 667105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 667205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6673ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6674d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 66752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 66762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 66772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 66782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 66792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 66802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 66812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 66822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 66832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 66842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 66852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 66862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 66872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 66882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 66892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 66902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 66912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6692d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6693d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 66942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 66952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 669651f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6697d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 6698ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) { 6699a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6700d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6701ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_ICEIfUnevaluated, E->getLocStart()); 6702d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6703a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6704d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6705ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_ICEIfUnevaluated, E->getLocStart()); 6706d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6707d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6708d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 67092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 67104e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().C99) { 6711d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6712d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6713ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) 6714ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_ICEIfUnevaluated, E->getLocStart()); 6715d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6716d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6717ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6718d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6719d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6720ceb59d91b3a7def4297ec8468621805777741963Richard Smith return Worst(LHSResult, RHSResult); 6721d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 67222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 67232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6724d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6725d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6726ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICEIfUnevaluated) { 6727d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6728d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6729d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 67302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6731a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6732d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6733d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6734d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6735d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6736ceb59d91b3a7def4297ec8468621805777741963Richard Smith return Worst(LHSResult, RHSResult); 6737d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6738d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6739d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6740d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6741d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6742d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6743d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6744d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 674532cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6746f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6747d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 67482116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 67492116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 67502116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 67512116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 67522116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 67532116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 67542116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 67552116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 67562116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 67572116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 67582116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 67592116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 67602116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 6761ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 67622116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 67632116b144cf07f2574d20517187eb8863645376ebRichard Smith } 67642116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6765eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6766eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 67677a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 67687a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6769eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6770eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6771eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6772d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6773eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6774ceb59d91b3a7def4297ec8468621805777741963Richard Smith return ICEDiag(IK_NotICE, E->getLocStart()); 6775eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6776d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 677756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 677856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 677956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 6780ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (CommonResult.Kind == IK_NotICE) return CommonResult; 678156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 6782ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (FalseResult.Kind == IK_NotICE) return FalseResult; 6783ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (CommonResult.Kind == IK_ICEIfUnevaluated) return CommonResult; 6784ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (FalseResult.Kind == IK_ICEIfUnevaluated && 67859b403c555a294530305f40dfee859b73070de542Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) != 0) return NoDiag(); 678656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 678756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6788d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6789d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6790d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6791d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6792d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6793d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6794d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6795d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 679680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 679780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6798d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6799ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (CondResult.Kind == IK_NotICE) 6800d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 680163fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6802f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6803f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 680463fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6805ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (TrueResult.Kind == IK_NotICE) 6806d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6807ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (FalseResult.Kind == IK_NotICE) 6808d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6809ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (CondResult.Kind == IK_ICEIfUnevaluated) 6810d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6811ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (TrueResult.Kind == IK_ICE && FalseResult.Kind == IK_ICE) 6812d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6813d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6814d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6815d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6816ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) 6817d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6818d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6819d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6820d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6821d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6822d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6823d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6824d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6825d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6826d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 68273026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6828d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6829d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6830f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6831f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6832f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6833f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6834f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6835f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6836f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6837f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6838f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6839f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 68404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 68414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6842dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6843dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 68444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 68454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6846dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6847f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6848f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6849dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 685080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Ctx.getLangOpts().CPlusPlus11) 6851f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6853ceb59d91b3a7def4297ec8468621805777741963Richard Smith ICEDiag D = CheckICE(this, Ctx); 6854ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (D.Kind != IK_ICE) { 6855ceb59d91b3a7def4297ec8468621805777741963Richard Smith if (Loc) *Loc = D.Loc; 6856d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6857d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6858f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6859f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6860f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6861f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6862f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 686380ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Ctx.getLangOpts().CPlusPlus11) 6864f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6865f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6866f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6867f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6868f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6869d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6870d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6871d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 68724c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 687370488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 6874ceb59d91b3a7def4297ec8468621805777741963Richard Smith return CheckICE(this, Ctx).Kind == IK_ICE; 687570488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 687670488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 68774c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 68784c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 68794c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 68804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 68814e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie assert(Ctx.getLangOpts().CPlusPlus); 68824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 688370488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 68844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 6885cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVector<PartialDiagnosticAt, 8> Diags; 68864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 68874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 68884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 68904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 68914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68924c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 68934c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 68944c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 68954c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 68964c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 68974c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 68984c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 68994c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 69004c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 69014c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6902745f5147e065900267c85a5568785a1991d4838fRichard Smith 6903745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6904cfa88f893915ceb8ae4ce2f17c46c24a4d67502fDmitri Gribenko SmallVectorImpl< 6905745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6906745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6907745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6908745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6909745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6910745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6911745f5147e065900267c85a5568785a1991d4838fRichard Smith 6912745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6913745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6914745f5147e065900267c85a5568785a1991d4838fRichard Smith 6915745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6916745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6917745f5147e065900267c85a5568785a1991d4838fRichard Smith 6918745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6919745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6920745f5147e065900267c85a5568785a1991d4838fRichard Smith 6921745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6922745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6923745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6924745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 692583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6926745f5147e065900267c85a5568785a1991d4838fRichard Smith 6927745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6928745f5147e065900267c85a5568785a1991d4838fRichard Smith 6929745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6930745f5147e065900267c85a5568785a1991d4838fRichard Smith 69311aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 69321aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 6933745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 69341aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 6935745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6936745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6937745f5147e065900267c85a5568785a1991d4838fRichard Smith 6938745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6939745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6940