ExprConstant.cpp revision 5cfc7d85fe13f144c9a8b264d6de9d38dfebc383
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" 38199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 3919cc4abea06a9b49e0e16a50d335c064cd723572Anders Carlsson#include "clang/AST/RecordLayout.h" 400fe52e1bcaa69ba127f1bda036f057fec1f478deSeo Sanghyeon#include "clang/AST/StmtVisitor.h" 418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/TypeLoc.h" 42500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/AST/ASTDiagnostic.h" 438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/Expr.h" 441b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/Basic/Builtins.h" 4506a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 467462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 47b2c60b04a597cc5ba4154837cf8e0a155a376fd7Argyrios Kyrtzidis#include "llvm/Support/SaveAndRestore.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 2911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith typedef llvm::DenseMap<const Expr*, APValue> MapTy; 292bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 293bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 294bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 295bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 29708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 2981aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments); 299bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 300bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 301bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 302dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 303dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 304dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 305dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 306dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 307dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 308dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 309dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 310dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 311dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 312dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 313dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 314dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 315dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 316789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 317789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 318789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 319789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 320789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 321789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 322789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 323789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 324789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 325789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 326789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 327789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 328789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 329789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 330789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 331789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 332789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 333789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 334dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 335dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 33683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 33783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 34283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 34383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 34483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 34683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 34783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 34883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 34983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 350c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 351dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 352d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis 3531e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 355f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 356d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 357bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 358d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 359d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 360d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 361d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 36283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 36383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 36483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 3651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, APValue> MapTy; 366bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 367bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 368c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 370bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 371745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 372bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 373bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 374180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 375180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 376180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 377180f47959a066795cc0f409433023af448bb0328Richard Smith 378180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 379180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 380180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 381180f47959a066795cc0f409433023af448bb0328Richard Smith 382c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 383c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 384c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 385c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 386745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 387745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 388745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 389745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 390745f5147e065900267c85a5568785a1991d4838fRichard Smith 391c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis /// \brief Stack depth of IntExprEvaluator. 392c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis /// We check this against a maximum value to avoid stack overflow, see 393c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis /// test case in test/Sema/many-logical-ops.c. 394c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis // FIXME: This is a hack; handle properly unlimited logical ops. 395c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis unsigned IntExprEvaluatorDepth; 396bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 397bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 398dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 39983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 40083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 401745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 402c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis CheckingPotentialConstantExpression(false), IntExprEvaluatorDepth(0) {} 403bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 4041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *getOpaqueValue(const OpaqueValueExpr *e) const { 405c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 406c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 407c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 408c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 40956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 410180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 411180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 412180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 413180f47959a066795cc0f409433023af448bb0328Richard Smith } 414180f47959a066795cc0f409433023af448bb0328Richard Smith 4154e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &getLangOpts() const { return Ctx.getLangOpts(); } 416c18c42345636e2866fed75c7e434fb659d747672Richard Smith 417c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 418745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 419745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 420745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 421745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 42283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 42383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 42483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 42583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 42683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 427c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 428c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 429c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 430c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 431c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 432c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 433f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 43483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 43583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 43683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 43783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 43883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 43983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 44083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 44183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 44283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 44383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 444c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 445c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 446c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 447c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 448c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 449c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 450c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 451c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 45208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 45308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 45408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 455c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 456f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 459c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 460f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 461f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 463dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 46408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 46508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 46608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 46708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 468745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 469745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 47008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 471c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 472dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 47308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 47408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 475745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 476745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 47708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 478dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 480dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 481dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 482dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 4835cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic Diag(const Expr *E, diag::kind DiagId 4845cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith = diag::note_invalid_subexpr_in_const_expr, 4855cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith unsigned ExtraNotes = 0) { 4865cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (EvalStatus.Diag) 4875cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Diag(E->getExprLoc(), DiagId, ExtraNotes); 4885cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith HasActiveDiagnostic = false; 4895cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return OptionalDiagnostic(); 4905cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith } 4915cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith 492dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 493dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4945cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith template<typename LocArg> 4955cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic CCEDiag(LocArg Loc, diag::kind DiagId 4967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 498dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 49951e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 50051e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 501dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 50251e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 503c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 504c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 505c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 506c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 507c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 508c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 509c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 510c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 511f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 512099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 513099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 514099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 515099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 516099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 517099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 518099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 519099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 520745f5147e065900267c85a5568785a1991d4838fRichard Smith 521745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 522745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 523745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 52474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 52574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 526745f5147e065900267c85a5568785a1991d4838fRichard Smith } 527c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 538f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 539f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 540f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 541f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 542f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 543f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 54474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 54574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 54674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 54774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 54874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 54974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 55074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 55174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 55274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 55374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 55474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 55574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 55674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 55774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 55974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 56074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 56174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 56208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 56308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 564b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 568b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 5695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 573b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 577b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 578b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 579b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 5805cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 581b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 582b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 583b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 5845cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 585b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 586b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 587b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 588b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 5911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments) 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 59383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 59608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 60108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6085ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6095ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 61008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 61308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6165fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 61808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 6201aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue &Arg = Frame->Arguments[ArgIndex]; 6211aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 625bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 626d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 64908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 65008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 65108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 65208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 65408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 65508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 65608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 657bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 65808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 659d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 66008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 662f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 664f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 665f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 666f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 667f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 668f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 669f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 670f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 671f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 672f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 673f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 674f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 675f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 676f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 677f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 678f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 679f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 680f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 6811aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &v) const { 682f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 6831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(FloatReal, FloatImag); 684f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 6851aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(IntReal, IntImag); 686f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 6871aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &v) { 68856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 68956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 69056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 69156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 69256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 69356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 69456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 69556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 69656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 69756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 69856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 699f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 700efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 701efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 7021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 703efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 70483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 7050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 706efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 70847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 709625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 71083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 713efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7141aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7151aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (Designator.Invalid) 7161aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, APValue::NoLValuePath(), CallIndex); 7171aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 7181aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, Designator.Entries, 7191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator.IsOnePastTheEnd, CallIndex); 720efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 7211aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(ASTContext &Ctx, const APValue &V) { 72247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 72347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 72447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 72583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator = SubobjectDesignator(Ctx, V); 7270a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 72983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7301bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 73283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 736b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 7435cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_null_subobject) 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 747b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 748b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 749b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 750b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 752b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 753b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 7545cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // Outside C++11, do not build a designator referring to a subobject of 7555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // any object: we won't use such a designator for anything. 7565cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (!Info.getLangOpts().CPlusPlus0x) 7575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.setInvalid(); 758b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 761b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 762b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 7645cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) 7655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addDeclUnchecked(D, Virtual); 766b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 767b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 7685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, CSK_ArrayToPointer)) 7695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addArrayUnchecked(CAT); 770b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 77186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 7725cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) 7735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addComplexUnchecked(EltTy, Imag); 77486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 775b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 7765cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkNullPointer(Info, E, CSK_ArrayIndex)) 7775cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.adjustIndex(Info, E, N); 77856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 779efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 8011aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 8021aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(getDecl(), isDerivedMember(), Path); 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 8041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &V) { 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 869c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 870b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 871b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 872b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 873b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 874b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 875b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 876b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 877b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 878b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 879c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 880c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 881c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 882c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 883c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 884c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 885f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 88687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 8871aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); 88883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 88983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 89083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 89183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 892efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 893efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 89787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 8981aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 899d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 900d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 901f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 902f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 903f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 9044efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 9054efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 9064efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 907180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 908180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 909180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 910180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 911180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 912180f47959a066795cc0f409433023af448bb0328Richard Smith} 913180f47959a066795cc0f409433023af448bb0328Richard Smith 9141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 915180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 916180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 917180f47959a066795cc0f409433023af448bb0328Richard Smith 918180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 919180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 92142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 923180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 92542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9271bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 92842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9301bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9321bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 934b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 935b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 936b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 937b78ae9716576399145786b93f687943f8b197170Richard Smith } 938180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 939180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 940180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 941180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 942180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 94347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 944180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 945180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 946180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 947180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 948180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 949180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 950180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 951180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 952180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 953180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 954745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 955745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 956745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 957745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 958745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 959745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 960745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 961745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 962180f47959a066795cc0f409433023af448bb0328Richard Smith } 96342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 96442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 96583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 96783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 96883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 96983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 97083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 97183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 97283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 97383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 97483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 9761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// value for an address or reference constant expression. Return true if we 9771aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// can fold this expression, whether or not it's a constant expression. 97883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 97983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 98083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 98183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 982c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 983c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 985b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 986b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 987b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 988c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 989c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 990c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 99183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 99283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 99383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 99483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 995c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 99683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 997c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 99861e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 99969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 1000f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 100183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 100283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 100383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 1004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1007b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1012b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 101383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 101461e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1015b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1016b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1017c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1018b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1019c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 102083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1021c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 102283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1023c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1024c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 102569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 102647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 102747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 102851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 102951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 103051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 103151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 103251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 103351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 103451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 103551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 10365cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) 103751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 103851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 10395cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 104051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 104151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 104251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10439a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 107483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 107583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 107683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 108283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 108383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 108483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 108883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 10891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LVal.setFrom(Info.Ctx, Value); 109083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10919a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 109283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 109383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 109483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10959a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10969a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10979e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10999e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11009e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 11019e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 110283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 11039e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11049e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 110565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 110665ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11070dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 110865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 110965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 11101aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { 11113554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11123554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1114e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11153554283157190e67918fad4221a5e6faf9317362John McCall return true; 11163554283157190e67918fad4221a5e6faf9317362John McCall } 11173554283157190e67918fad4221a5e6faf9317362John McCall 1118e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1119e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11203554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1121e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11220dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11235bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11245bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 11251aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool HandleConversionToBool(const APValue &Val, bool &Result) { 1126c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1127c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1128c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1129c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1130c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 113141bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1133c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1134a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1136c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1138c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1140c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1141c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1142436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1143e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1144e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1145e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1147e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1149cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1150180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1151180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 115265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1153c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11554efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1156c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1157c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1158c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1159c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1160c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1161c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 11621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 1163d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis if (!Evaluate(Val, Info, E)) 1164c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1165d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis return HandleConversionToBool(Val, Result); 11664efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1168c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1169c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 11715cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_overflow) 1172789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1173c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1174c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1175c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1176c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1177c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1179c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1180a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1181575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1183c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1184a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1185c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1187c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1188c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1189a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1190a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1191c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1193c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1194c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1195a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1196c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1197c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1198c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1199c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1200c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1201a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1202a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1203f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1204f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1205f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1206f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1207a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1208a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1209a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12109f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1211575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1212a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1213a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1214a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1216c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1218c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1220c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1221c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1223c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1224a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1225a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1226e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 12281aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue SVal; 1229e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 12565cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1261e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1263e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1265e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1266e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1267e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1268e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 12695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1270e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1271e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1272e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1273b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1279180f47959a066795cc0f409433023af448bb0328Richard Smith 1280b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1281b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1282b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1283b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1284b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1285b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1286180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1287180f47959a066795cc0f409433023af448bb0328Richard Smith 1288b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1290e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1291180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1292180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1294180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1296180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1297180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1298180f47959a066795cc0f409433023af448bb0328Richard Smith } 1299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1300180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1301180f47959a066795cc0f409433023af448bb0328Richard Smith} 1302180f47959a066795cc0f409433023af448bb0328Richard Smith 1303b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1304180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1305180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1306180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1307180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1308180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1309b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1310180f47959a066795cc0f409433023af448bb0328Richard Smith} 1311180f47959a066795cc0f409433023af448bb0328Richard Smith 1312b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1313180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1314180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1315180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1316180f47959a066795cc0f409433023af448bb0328Richard Smith 1317180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1319180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1320180f47959a066795cc0f409433023af448bb0328Richard Smith } 1321180f47959a066795cc0f409433023af448bb0328Richard Smith 1322b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1323b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1325b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1326180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1328b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1329180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1330180f47959a066795cc0f409433023af448bb0328Richard Smith 1331b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1332180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1333180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1334b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1335180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1336180f47959a066795cc0f409433023af448bb0328Richard Smith} 1337180f47959a066795cc0f409433023af448bb0328Richard Smith 1338180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1339180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1340b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1341180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1342180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1343180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1344180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1345180f47959a066795cc0f409433023af448bb0328Richard Smith 1346180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1347180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1348b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1349180f47959a066795cc0f409433023af448bb0328Richard Smith} 1350180f47959a066795cc0f409433023af448bb0328Richard Smith 1351d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1352d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1353d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1354d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1355d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1356d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1357d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1358d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1359d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1360180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 136174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 136274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1363180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1364180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1365180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1366180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1367180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1368180f47959a066795cc0f409433023af448bb0328Richard Smith } 1369180f47959a066795cc0f409433023af448bb0328Richard Smith 1370180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1371180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 137274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 137374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1374180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1375180f47959a066795cc0f409433023af448bb0328Richard Smith } 1376180f47959a066795cc0f409433023af448bb0328Richard Smith 1377180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1378180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1379180f47959a066795cc0f409433023af448bb0328Richard Smith} 1380180f47959a066795cc0f409433023af448bb0328Richard Smith 1381180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1382180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1383b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1384180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1385180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1386180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1387b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1388b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1389b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1390180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 139174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1392180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1393180f47959a066795cc0f409433023af448bb0328Richard Smith 1394180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1395180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1396b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1397180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1398180f47959a066795cc0f409433023af448bb0328Richard Smith} 1399180f47959a066795cc0f409433023af448bb0328Richard Smith 140086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 140186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 140286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 140386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 140486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 140586024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 140686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 140786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 140886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 140986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 141086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 141186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 141286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 141386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 141486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 141586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 141686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 141786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 141803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1419f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1420f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 14211aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith CallStackFrame *Frame, APValue &Result) { 1422d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1423d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1424d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1425745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1426745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1427745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1428745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1429f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 14305cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1431177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1433177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1434177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1435d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 143603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1437099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1438099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1439099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1440745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1441745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1442745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 14435cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1444099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1445099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1446099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1447180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1448180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1449180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 14501aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *Info.EvaluatingDeclValue; 1451180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1452180f47959a066795cc0f409433023af448bb0328Richard Smith } 1453180f47959a066795cc0f409433023af448bb0328Richard Smith 145465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 145565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1456f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 14575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 145865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1459f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 146065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1461099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1462099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1463099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1464099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 14655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_var_init_non_constant, 1466099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1467099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1468099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 146947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1470099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 14715cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, 1472099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1473099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1474099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1475f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 147603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 14771aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *VD->getEvaluatedValue(); 147847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 147903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 148003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1481c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 148203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 148303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 148403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 148503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 148659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 148759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 148859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 148959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 149059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 149159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 149259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 149359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 149459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 149559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 149659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 149759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 149859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 149959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 150059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1501f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith/// Extract the value of a character from a string literal. 1502f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1503f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith uint64_t Index) { 1504f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1505f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1506f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1507f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1508f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1509f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Lit->getType()->getArrayElementTypeNoTypeQual()->isUnsignedIntegerType()); 1510f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1511f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1512f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1513f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1514f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1515cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1516f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 15171aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Obj, QualType ObjType, 1518cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1519b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1520b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1521cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1522b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15235cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1524aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1525aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1528f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1529cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1530745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1531745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1532745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1533cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 15340069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue *O = &Obj; 1535180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1536cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1537cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1538180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1539cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1540f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1541cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1542f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15455cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1546aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1547aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1548cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1549f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1550f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1551f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1552f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1553f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1554f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 15551aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(ExtractStringLiteralCharacter( 1556f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Info, O->getLValueBase().get<const Expr*>(), Index)); 1557f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1558f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1559cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1560cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1561cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1562cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 156386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 156486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 156586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 156686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 15675cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 156886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 156986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 157086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 157186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 157286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 157386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 15741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexIntImag() 157586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 157686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 157786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 15781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexFloatImag() 157986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 158086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 158186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1582180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1583b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 15845cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_mutable, 1) 1585b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1586b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1587b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1588b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1589b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1590180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1591180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1592180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1593180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1594180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 15965cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_inactive_union_member) 15977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1598180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1599f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1600180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1601180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1602180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1603180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16085cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_volatile_obj, 1) 16097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16125cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 16137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1616cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1617180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 161859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 161959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 162059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 162159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1622cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1623180f47959a066795cc0f409433023af448bb0328Richard Smith 1624f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1625745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 16265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_uninit); 1627180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1629cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1630cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 16310069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // This may look super-stupid, but it serves an important purpose: if we just 16320069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // swapped Obj and *O, we'd create an object which had itself as a subobject. 16330069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // To avoid the leak, we ensure that Tmp ends up owning the original complete 16340069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // object, which is destroyed by Tmp's destructor. 16350069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue Tmp; 16360069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith O->swap(Tmp); 16370069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith Obj.swap(Tmp); 1638cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1639cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1640cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1641f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1642f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1643f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1644f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1645f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1646f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1647f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1648f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 164986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 165086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1651f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1652f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1653f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1654f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1655f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 165686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 165786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 165886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 165986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1660f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1661f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1662f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1663f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1664f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1665f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1666f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1667f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1668f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1669f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1670f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1671f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1672f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1673f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1674f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1675f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1676f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1677f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1678f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1679f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1696f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1697f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1698180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1699180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1700180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1701180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1702180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1703f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1704f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17059ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17069ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1707180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1708180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1709f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1710f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 17111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const LValue &LVal, APValue &RVal) { 1712b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1713b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1714b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1715b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1717c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1718f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1719f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17205cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 17217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 172483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 172583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 172683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 172783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 17285cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 172983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 173083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 173183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17405cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_type) << Type; 17417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17425cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1743c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1744f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1745c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17461bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1747c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1748c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1749d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1750d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1751c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1752c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 17533d13c5a1e72ed8f8be9c083791d30643d1b1ec43Daniel Dunbar if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) 1754f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1755f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 17565cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17570a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1758f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1759f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 17607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 17617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 17621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 17637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1769f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17795cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 17907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17915cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17945cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv); 17957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 17987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18025cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1805f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1808f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1809c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1810c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 181147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1812f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1813c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1814c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1815c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1816c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1817c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1818c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18211bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 182283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 182383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 182483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 182583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 18265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 182783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 182883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 182983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 183083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 183183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 183283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18385cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1846177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1847cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1848cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1849177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1850cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1851cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1852cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1853cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1854cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1855c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1856cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1857cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1858f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1859f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1860f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1861f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 18621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RVal = APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0); 1863f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 18645cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 1865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1866f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1867c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1868f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1869f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1870c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1871c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 187259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 187359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 187459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 187559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 187659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 187759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 187859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 187959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 188059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1904745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1905745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1913e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1917745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1918745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1919745f5147e065900267c85a5568785a1991d4838fRichard Smith 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1924b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1925e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1927e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1938b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1939b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1940b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1955b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1959b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1964d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1965d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1966d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1967d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1968d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1969d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1970d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1981b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1987b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1988b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1989b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 19905cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 1991b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1992b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1993b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1995b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1996b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1997b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2001b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 20055cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 201259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 201359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2014c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2015d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2016d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2017d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2018d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2019d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2020d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2021d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2022d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2023d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2024d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2025d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 20261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 2027d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2028d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2029d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2030d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2031d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2032d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2033d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2034d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2035d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2036c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2037c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 203883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2039c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2040c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2041c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2042d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2043d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2044d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2045d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2048d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2049d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2050d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2051d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2052d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2053d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2054d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2055d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20566180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20576180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20586180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20596180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20606180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 206151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 206251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20636180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20646180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20656180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20674c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20684c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20694c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 20706180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 20714c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20724c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20734c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20744c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20754c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 20786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 20816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 20826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2083c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2084c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2085c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2087c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2088745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2089745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2090745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2091745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2092745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2093745f5147e065900267c85a5568785a1991d4838fRichard Smith 2094c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2095c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2096c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2097c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2098c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2099c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2100099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2101099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2102c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2103c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2104c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2105c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2106c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2107c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2110c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2111c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2112180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 21131aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithtypedef SmallVector<APValue, 8> ArgVector; 2114180f47959a066795cc0f409433023af448bb0328Richard Smith} 2115180f47959a066795cc0f409433023af448bb0328Richard Smith 2116180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2117180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2118180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2119745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2120180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2121745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2122745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2123745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2124745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2125745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2126745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2127745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2128745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2129745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2130745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2131180f47959a066795cc0f409433023af448bb0328Richard Smith} 2132180f47959a066795cc0f409433023af448bb0328Richard Smith 2133d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2134745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2135745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 21371aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith EvalInfo &Info, APValue &Result) { 2138180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2139180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2140180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2141d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2142745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2143745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2144745f5147e065900267c85a5568785a1991d4838fRichard Smith 2145745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2146d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2147d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2148d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2149180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2150745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 215159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2152180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 215351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2154180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2155180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2156180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2157180f47959a066795cc0f409433023af448bb0328Richard Smith 2158745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2159745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2160745f5147e065900267c85a5568785a1991d4838fRichard Smith 216186c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 216286c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 216386c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 216486c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 216586c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 216686c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2167745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2168180f47959a066795cc0f409433023af448bb0328Richard Smith 2169180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2170180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2171180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 217283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2173180f47959a066795cc0f409433023af448bb0328Richard Smith } 2174180f47959a066795cc0f409433023af448bb0328Richard Smith 2175610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2176610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2177610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2178610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2179f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor ((Definition->isCopyConstructor() && Definition->isTrivial()) || 2180f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor (Definition->isMoveConstructor() && Definition->isTrivial()))) { 2181610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 21821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS.setFrom(Info.Ctx, ArgValues[0]); 21831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 21841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS, Result); 2185610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2186610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2187610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 218851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2189180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2190180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2191180f47959a066795cc0f409433023af448bb0328Richard Smith 2192180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2193180f47959a066795cc0f409433023af448bb0328Richard Smith 2194745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2195180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2196180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2197180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2198180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2199180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2200180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2201745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2202745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2203745f5147e065900267c85a5568785a1991d4838fRichard Smith 2204745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2205180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2206180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2207180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2208180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 220986c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2210180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2211180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2212180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2213180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2214180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2216180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2217745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2218180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2219b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2220180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2221180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2222745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2223745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2224745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2225745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2226d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2227d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2228d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2229d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2230d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2231d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2232d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2233d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2234d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2235d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2236d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2237d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2238d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2239d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2240d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2241d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2242d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2243d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2244d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2245d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2246d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2247745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2248d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2249d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2250d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2251d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2252d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2253180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2254d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2255180f47959a066795cc0f409433023af448bb0328Richard Smith } 2256745f5147e065900267c85a5568785a1991d4838fRichard Smith 225783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 225883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2259745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2260745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2261745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2262745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2263745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2264745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2265745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2266180f47959a066795cc0f409433023af448bb0328Richard Smith } 2267180f47959a066795cc0f409433023af448bb0328Richard Smith 2268745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2269180f47959a066795cc0f409433023af448bb0328Richard Smith} 2270180f47959a066795cc0f409433023af448bb0328Richard Smith 2271d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2272770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 22738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 22741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2275c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2276c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22771e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2278c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2279c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 22808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2281c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2282c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2283c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 22858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2286f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2287f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 22888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 22891e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2290c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2291c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2292c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2293f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 22941e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2295f85e193739c953358c865005855253af4f68a497John McCall return true; 2296f85e193739c953358c865005855253af4f68a497John McCall return false; 2297f85e193739c953358c865005855253af4f68a497John McCall } 2298f85e193739c953358c865005855253af4f68a497John McCall 2299c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2300c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 23018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 23028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 23038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2304c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 23058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 23078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 23088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 23098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 23108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2311f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 23128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2313980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 23151e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 23168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 23178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 23188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 23198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2320980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 23228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 23238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 23248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 23258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 23261e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2327c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2328980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2329c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2331363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2332363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2334363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2335363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23374423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2338363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2339363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2340ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 23418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2342c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2343c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 234456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 234556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 234656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 234756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 234856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 234956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 235056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 235156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 235256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 235356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 23541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 235556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 235656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 235756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 235856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 235956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 236056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 236156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 236256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 236374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: For a recursive constexpr call, an outer stack frame might have 236474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // been using this opaque value too, and will now have to re-evaluate the 236574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // source expression. 236656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 236756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 236856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 236956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2370c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2371c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 23748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 23768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2378f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 23821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RetTy DerivedSuccess(const APValue &V, const Expr *E) { 23838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 238551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 238651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2387f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 238974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 239074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 239174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 239274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 239374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 239474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 239574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 239674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 239774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 239874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 239974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 240074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 240274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 240374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 240474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 240674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 240774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 240874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 240974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 241274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 241674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 241774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 241874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 241974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 242074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 242174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 242274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 242374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 242474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 242574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 242674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 242774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 24288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 24298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 24308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 24318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 24328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2433dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 24345cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Info.CCEDiag(E, D); 2435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2436f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2437f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2438f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 24405cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, D); 2441f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2442f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2444f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 244751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2448f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 24498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 24508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 24518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2453b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 24548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2456f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 24578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 24608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 24628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 24648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 24668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 24678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 24688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 246991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 247091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 24713d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 24723d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2473bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2474bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2475bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2476bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 24778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2478c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2479c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2480c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2481c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2482c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2483c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2484c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2485c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2486c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2487e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2488e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2489e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2490f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2492e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2494e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2495e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 25011aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2503e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2504e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2505e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2506e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2507e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2508e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 25098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 251074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Cache the value of the common expression. 25118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 25128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 25148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 251574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 25168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 253674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2538f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2539f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2540f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2541f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2542f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 25438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 25461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Value = Info.getOpaqueValue(E); 254742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 254842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 254942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2550f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 255142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 255242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2553f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 255442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 255542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 255642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 255747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 25588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2559f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2560d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2561e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2562d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2563d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 25646142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 256559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 256659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 256786c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 256859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 256959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 257059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2571f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2572e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2573e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2574e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2575f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2576f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2577e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 257886c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2581f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2584e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2585f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2586f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2588f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 259059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2591b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2592b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2593f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 259459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2595b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 25981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 259959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2600f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 260159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 260259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 260359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 260459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 260559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2606f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2607f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2608f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 261259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 261359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 261459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 261559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 261659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2617d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 261859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 261959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2620f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 262159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2623d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2624b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2625b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2626b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 262786c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 262886c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 262986c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 263086c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 263186c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 263286c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2633c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2634d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 26351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2636d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2637c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2638745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2639745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2641d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 264283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2643d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2644d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2645c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2646c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2647c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2648f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 264971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 265071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 265171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 265271523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2653f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2654f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2655f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 265651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2657f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2658f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 265951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2660f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 266251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2664f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2665180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2666180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2667180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2668180f47959a066795cc0f409433023af448bb0328Richard Smith 26691aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 2670180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2671180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2672180f47959a066795cc0f409433023af448bb0328Richard Smith 2673180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2674180f47959a066795cc0f409433023af448bb0328Richard Smith 2675180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2676f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2677180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2678180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2679180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2680180f47959a066795cc0f409433023af448bb0328Richard Smith 2681b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2682b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2683180f47959a066795cc0f409433023af448bb0328Richard Smith 2684f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2685180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2686180f47959a066795cc0f409433023af448bb0328Richard Smith } 2687180f47959a066795cc0f409433023af448bb0328Richard Smith 2688c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2689c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2690c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2691c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2692c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26937a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26947a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2695c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26967d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2697c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2698c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2699c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2700c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2701f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2702f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 27031aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RVal; 27049ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 27059ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 27069ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2707f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2708f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2709c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2710c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2711c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2712f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2713c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2714c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27158327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 27168327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 27171aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 27188327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 27198327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 27208327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 27218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 27228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 27248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 27461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 27471aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(this->Info.Ctx, V); 2748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2758c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2759af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2760c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2761c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2762c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2769d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2770d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2771d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2772d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2773d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2774d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2775d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2776d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2777d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2778d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2780d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 27811aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RefValue; 2782d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2817b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 28314efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2832c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2835c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2836c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2838c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 28391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 28401bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 28411bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 28421bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2843c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2844c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 284547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2846c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2847180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2848c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2849c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2850c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2851c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 28521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 285383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 285483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 28551bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 28564efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 28574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2858770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 28604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 28631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2864c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2865c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 28668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 28678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2868bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 28698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 28708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 28718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 28728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 287347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 28748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 28758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 287686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 287786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 28788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 288026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 288126bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 288326bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2884db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2885c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28860a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28870a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28880a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2890db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2892180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2893180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 289526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 289626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 28974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 28984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 28994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2900c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2901c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2902c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2903c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2904c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2905efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2906c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2907c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2908c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 29098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 29104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29114efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 29131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 29141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 29151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2916c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2919436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2921177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2922177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 292383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2924177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2925177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 29261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2927177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 292850c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 29291aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue V; 2930f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2931f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2932f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 293335873c49adad211ff466e34342a52665742794f5Anders Carlsson} 293435873c49adad211ff466e34342a52665742794f5Anders Carlsson 2935bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2936bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2938af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 294183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 294283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 294383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2951f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 295483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2956bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2957bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 29598cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2960c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2961c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2962c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2963efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 29644efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29654efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 296647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 296747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 296847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 296947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 297047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 29715cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_typeid_polymorphic) 297247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 297347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 297447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 297547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 297647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 297747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 297847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 29798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2980c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2982c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2983c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2984c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2985c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2986d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2987d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2988d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2989d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29901bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2991d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2992d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2993d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2994180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 29964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2999c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 3000c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 3001f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3002c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 30033068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 3004efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30063068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 30073068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 3008efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3009180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 3010180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 3011180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 30123068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 3013b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 30143068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 30154efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 3017efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 3018e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 3019e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 302086024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 302186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 302286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 302386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 302486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 302586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 302686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 302786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 302886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 302986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 303086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 303186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 303286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 303386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 303486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 303586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 303686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 303786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 30384efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 3039f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 3040f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3041f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3042c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 3043770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 30448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 3045efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 3046efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 30478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 30481bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 3049efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3050efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 30512bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 30521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3053efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 30548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 3055f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 30561aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 30571aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, V); 30588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 30592bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 306051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3061f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 3062f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 30632bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3064efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 30658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3066efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 30678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3068efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 3069ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCNumericLiteral(const ObjCNumericLiteral *E) 3070ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek { return Success(E); } 30718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3072efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 30738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 30748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3075469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3076efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3077f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3078b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3079180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3080180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3082180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3083180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3084180f47959a066795cc0f409433023af448bb0328Richard Smith } 308556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3086ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30872bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3088f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30892bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3090efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3091c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3093f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3094650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3095efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 30962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 30972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3098e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 30991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3100650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3101650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3102650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3103f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 31041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3105745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3106745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3107efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 31081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3109efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3110745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3111efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3112efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3113efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3114efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 31150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 31160a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3117650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3118180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3121650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 31224efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3123efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3124efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 31254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 31261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 31288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3129650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 313009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 313109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 313209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 313309a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 31351d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 31361d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 31372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 313828c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 313928c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3140c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3141c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3142c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 31434cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 314428c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 31454cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 31464cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 31474cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 31484cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 31494cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 31504cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 31510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 315209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31535c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 31545c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 315547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 31565c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3157e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3158e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 31595c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3160180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 31615c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3162180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3163180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 31645c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3165180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 31665c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 31695c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3170180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 31715c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31725c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 31735c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 31745c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31755c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3176e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3177e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3178e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3179e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3180e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3181e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3182e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 318347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 318451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3185404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3187c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3188c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 31891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Value; 3190efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 319109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 319269ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3193efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 319447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 319547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 31961bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 319747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 319883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 31990a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3200efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3201efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3202efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 32031aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, Value); 3204efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3205650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3206650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 32072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3208e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3209e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3210e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3211e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 321283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 321383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 321483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3215e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3216e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 32170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3219b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3220b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 32230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 32246a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 32252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 32266a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 32274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 32284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3229c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 32301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3231650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 32328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3233180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3234efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 323556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 32368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 32374efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3238f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3239f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3242e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3245e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3246e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3247e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3249e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3250e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3251e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 32571aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 3258e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 326151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3263e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3271e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3273e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3274e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3275e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3276e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3277e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3278e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3279e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3281e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 328251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3283e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3284e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3285e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3287e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3290e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3291e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3298f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3303e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3304e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3305e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3307e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3308e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3311e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3314f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3316e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3317e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3318e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3319e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3320e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3321e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3322e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3323e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3326e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3327180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3328180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3329180f47959a066795cc0f409433023af448bb0328Richard Smith 3330180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3331180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3332180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3333180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3334180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3335180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3336180f47959a066795cc0f409433023af448bb0328Richard Smith 3337180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3338180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3339180f47959a066795cc0f409433023af448bb0328Richard Smith 33401aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 334183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 334283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3343180f47959a066795cc0f409433023af448bb0328Richard Smith } 334451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3345180f47959a066795cc0f409433023af448bb0328Richard Smith 334659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3347180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3348180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3349180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3350180f47959a066795cc0f409433023af448bb0328Richard Smith} 3351180f47959a066795cc0f409433023af448bb0328Richard Smith 335251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 335351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 335451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 335551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 335651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 335751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 335851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3359b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3360b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 336151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 336251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 336351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 336451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 336551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 336651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 336751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 336851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 336951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 337051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 337151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3372b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 337351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 337451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3375b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3376b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 337751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 337851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 337951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 338051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 338151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3382b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3383b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 338451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 338551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 338651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 338751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 338851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3389b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 339051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 339151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 339283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 339351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 339451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 339551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 339651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 339751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 339851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 339951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 340051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 340151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 340251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 340351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 340451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 340551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 340651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 340751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 340851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 340951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 341051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 341151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3412b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 341351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 341451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 341583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 341651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 341751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3418ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 34195cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_virtual_base) << RD; 3420ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3421ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3422ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3423b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 342451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 342551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 342759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 342859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 342959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 343059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 343159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 343259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 343359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 343459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 343559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 34361aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue DerivedObject; 3437f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 343859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 344159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 344259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 344359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 344459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 344559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 344659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 344759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 344859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 344959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 345059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 345159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 345259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 345359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 345459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 345559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 345659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 345759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3458180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 345924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 346024fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 346124fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 346224fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3463180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3464180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3465180f47959a066795cc0f409433023af448bb0328Richard Smith 3466180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3467ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3468ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3469ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3470180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3471ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3472ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3473ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3474ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3475ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3476ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3477180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3478ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 347983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3480180f47959a066795cc0f409433023af448bb0328Richard Smith } 3481180f47959a066795cc0f409433023af448bb0328Richard Smith 3482180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3483180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3484180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3485180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3486180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3487745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3488180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3489180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3490180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3491180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3492180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3493180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3494180f47959a066795cc0f409433023af448bb0328Richard Smith 3495180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3496180f47959a066795cc0f409433023af448bb0328Richard Smith 3497745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3498745f5147e065900267c85a5568785a1991d4838fRichard Smith 3499745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3500745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3501745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3502745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3503745f5147e065900267c85a5568785a1991d4838fRichard Smith 3504745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3505745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3506745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3507745f5147e065900267c85a5568785a1991d4838fRichard Smith 350883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3509745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3510745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3511745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3512180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3513745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3514180f47959a066795cc0f409433023af448bb0328Richard Smith } 3515180f47959a066795cc0f409433023af448bb0328Richard Smith } 3516180f47959a066795cc0f409433023af448bb0328Richard Smith 3517745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3518180f47959a066795cc0f409433023af448bb0328Richard Smith} 3519180f47959a066795cc0f409433023af448bb0328Richard Smith 3520180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3521180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 352251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 352351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3524ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3525ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3526ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3527ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 352851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 352951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 353051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 35316180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 35326180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 35336180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 35346180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 35356180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 35366180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 35376180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 35386180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 35396180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3540180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3541180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3542180f47959a066795cc0f409433023af448bb0328Richard Smith 3543c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3544c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3545180f47959a066795cc0f409433023af448bb0328Richard Smith 3546610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 354751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3548180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3549180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3550180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3551180f47959a066795cc0f409433023af448bb0328Richard Smith 355251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 355351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 355451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3555180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3556745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3557f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3558f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3559180f47959a066795cc0f409433023af448bb0328Richard Smith} 3560180f47959a066795cc0f409433023af448bb0328Richard Smith 3561180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3562180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3563180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3564180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3565180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3566180f47959a066795cc0f409433023af448bb0328Richard Smith} 3567180f47959a066795cc0f409433023af448bb0328Richard Smith 3568180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3569e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3570e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3571e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3572e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3573e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3574e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3575e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3576e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3577e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3578e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 358483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 358583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3587e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3588e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3590e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3593e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3594e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3595e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3596e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3597e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3598e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3600e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3603e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3605e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3606e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3607e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3608e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3609e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3610e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3611af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3612e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3613e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3614e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3615e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 361659b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 361759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 361859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 361959b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3620770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 362107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 362207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 362359b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 36241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 362507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 362607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 36271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 362807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 362907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 363007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 363107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 363207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 363307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 36341aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 363569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 363607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 363707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 363807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 363951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 36401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 364107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 364291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 364307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 364407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 364507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 364691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 36472217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 364891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 364959b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 365059b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 365159b5da6d853b4368b984700315adf7b37de05764Nate Begeman 365259b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3653c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 365407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 365559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 365659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 365707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 365807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3659c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 36601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3661d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3662e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 366359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 366446a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 366546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 366607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 366746a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 366846a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 366946a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3670f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 367107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 367246a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 367346a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 367446a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3675f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 367607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 367746a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 367807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 367946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3680c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3681c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 368207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 368307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3684e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3685e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3686e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3687e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3688e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3689e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3690e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3691e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3692e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3693e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3694e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3695e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3696e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3697e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3698e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3699e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3700e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3701e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3702e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3703e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3704e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3705e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3706e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3707e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3708e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3709e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3710e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3711e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3712e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3713e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3714e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3715e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3716e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3717e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3718e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3719e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3720e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3721e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3722e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 372346a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3724c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3725c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 372659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 372759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 372807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 372959b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 373007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 373159b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 373291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 37331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 373459b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 37355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 373659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 37373edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 37383edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 37393edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 37403edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 37413edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 37423edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 37433edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 37443edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 37453edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 37463edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 37473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 37483edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 37493edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 37503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 37513edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 37523edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 37533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 375459b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 37553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 37574b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 37593edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 37603edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 37613edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 376259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 376359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 37643edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37653edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 37664b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37673edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 37683edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 37693edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 37703edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 377159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 37723edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 377359b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 377407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 377559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 377659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 377707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 377851201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 377907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 378091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 378191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 378291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 378391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 378491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 378591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 378691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 378791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 37885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 378907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 379091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 379191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 379207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 37938327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 379451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 379591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 379691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 379759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3798cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3799cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3800cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3801cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3802cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3803cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3804180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3805cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3806cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3807cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3808180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3809180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3810cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3811cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3812f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3813f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3814cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3815cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3816cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3817cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 381851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3819180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3820180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3821180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3822f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3823180f47959a066795cc0f409433023af448bb0328Richard Smith 3824180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3825180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3826180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3827180f47959a066795cc0f409433023af448bb0328Richard Smith 382851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3829180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3830b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3831180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 383283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3833180f47959a066795cc0f409433023af448bb0328Richard Smith } 3834180f47959a066795cc0f409433023af448bb0328Richard Smith 3835cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3837cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3838cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3839cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3840180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3841180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 384251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3843180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3844cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3845cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3846cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3847cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3848cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3849f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3850cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3851974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3852974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3853ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3854974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3855974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3856974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3857974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 38581aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 3859f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3860f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3861974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3862974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3863745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3864745f5147e065900267c85a5568785a1991d4838fRichard Smith 3865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3866cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3867180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3868b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3869180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3870cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3871180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 387283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 387383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3874745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3875745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3876745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3877745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3878745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3879745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3880180f47959a066795cc0f409433023af448bb0328Richard Smith } 3881cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3882745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3883cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3884180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3885180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3886180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3887180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 388883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 388983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3890cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3891cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3895f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3897ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3898ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3899ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 39046180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 390551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 390651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3907ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3908ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3909ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 391051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 391151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3912b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 391351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 391483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 391551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 391651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 39176180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 39186180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 39196180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 39206180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 39216180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 39226180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 39236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 39246180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 39256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 39266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3927e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3930c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3931c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3938b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 393951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3940ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 394151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 394283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 394351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 394451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 394551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3947745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3952cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3953f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3954c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3955c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3956c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3957c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3958f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3959f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3960f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3961770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 39628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 39631aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Result; 3964f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 39651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith IntExprEvaluator(EvalInfo &info, APValue &result) 39668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3967f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3968973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3969973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 39702ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3971973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 39723f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3973973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39743f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(SI); 39763f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 39773f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 39783f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3979131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 39802ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39812ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 398230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39833f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(APSInt(I)); 3985575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3986575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3987131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3988131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3989131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3990131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 39912ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39922ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 39931aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3994131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3995131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3996131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 39974f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 39984f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 39994f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 40004f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 40011aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 40025930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 4003342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 4004342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 4005342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 40068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 400732fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 40081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 400951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 4010f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 4011c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis // FIXME: See EvalInfo::IntExprEvaluatorDepth. 4012c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis bool Visit(const Expr *E) { 4013c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis SaveAndRestore<unsigned> Depth(Info.IntExprEvaluatorDepth, 4014c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis Info.IntExprEvaluatorDepth+1); 4015c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis const unsigned MaxDepth = 512; 4016c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis if (Depth.get() > MaxDepth) { 4017c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis Info.Ctx.getDiagnostics().Report(E->getExprLoc(), 4018c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis diag::err_intexpr_depth_limit_exceeded); 4019c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis return false; 4020c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis } 4021c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis 4022c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis return ExprEvaluatorBaseTy::Visit(E); 4023c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis } 4024c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis 40258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 40268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 40278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 4028f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40294c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 4030131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40314c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 40324c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 4033131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40344c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 4035043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 4036043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 4037043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 40388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 40398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 40408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4042043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4043043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4044043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4045c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4046043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4047043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4050043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4051043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4053b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4055b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4056f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4058f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 40590518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 40603068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4061131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40623068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 40631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4064ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { 4065ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek return Success(E->getValue(), E); 4066ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } 4067ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek 4068f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 40693f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 407051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4071664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4072664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 407364b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 40740dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 407564b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 407664b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 40776ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 40786ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 40796ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 40806ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 40814ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor bool VisitTypeTraitExpr(const TypeTraitExpr *E) { 40824ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor return Success(E->getValue(), E); 40834ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor } 40844ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor 408521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 408621ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 408721ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 408821ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4089552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4090552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4091552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4092552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4093722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4094664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4095664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4096295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4097ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4098cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4099fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 41008b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 41018b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 41021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 41038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4104664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4105f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4106f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4107f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4108c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4109c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4110c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4111c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4112c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4113c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4114c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4115c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 41161aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 411747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4118c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 41198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 412069ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 412169ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4122f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 41231aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 4124f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4126f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4127f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4128f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 41295cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 413030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4131f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 413230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 413330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4134f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4135f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4137f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4138f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4139043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 41404c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4141bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4142973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4143973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4144973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4145973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4146973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4147973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4148973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4149973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4150973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4151973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4152973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4153973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4154973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4155973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4156973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4157973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4158973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4159bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41614c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41624c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4163a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4164a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4165a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4166a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 41677c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4168a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4169a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4170a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4171a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4172a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4173a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4174a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4175a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4176a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4177a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4178a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 41791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 41801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4181a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4182a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4183a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 41841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4185a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4186a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4187a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4188a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4189a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4190a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4191a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4192a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4193a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4194a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4195a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4196a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4197a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4198a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4199a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4200a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4201a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4202a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4203a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4204a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4205a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4206fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4207a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4208a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4209a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4210a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4211a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4212a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4213a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4214a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4215b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4216a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4217a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 421880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 421980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 422080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 422180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 422280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 422380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 422480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 42258e55ed1ad3acf9c7f8424aa7d326b3b2c18e943bDouglas Gregor const Expr *E = LV.getLValueBase().template dyn_cast<const Expr*>(); 422680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 422780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 422880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 422980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 423080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 423180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 423280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 423380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 423480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 423580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 423680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 423780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 423880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 423980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 424080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 424180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 424280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 424380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 424480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 424580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 424680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 424780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 424880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 424980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 425080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 425180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 425280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 425380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 425480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 425580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 425680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 425780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 425880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 425980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 426080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 426180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 426280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 426380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 426480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 426580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 426680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 426780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 426880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 426980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 427080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 427180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 427280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 427342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 427442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 42751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 42761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 42771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 427842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 42791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 42801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 42811bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 428242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 428342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 428442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 428542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 428642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 428842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 428942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 429042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 429142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 429242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 429342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 42941bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 429542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42961bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 429742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 429842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 42991357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 430042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 430142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 430342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 430442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 430542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 430642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 430742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 430842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 430942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 431042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 43114f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 431242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 431342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4315180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4316019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 43178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 431864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 431964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 432042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 432142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 432264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4323b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4324b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4325393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4326a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4327cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 432864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 432964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4330c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4331f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 433264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 433364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4334019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4335131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 433780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 433880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4339e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 434021fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4341a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4342bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 434321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 434421fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4345c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4346c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4347c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 434840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43495726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 435040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 435140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 43525cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_function) 435340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 435440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 43555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 435640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43575726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43585726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43595726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43615726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43625726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43635726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 43655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 43665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 43675726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 43685726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 43695726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 43705726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 43715726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4372f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4373454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4374454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4375454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4376454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4377454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4378454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4379454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4380454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4381454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4382454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4383454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4384454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4385454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4386454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4387454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4388454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4389454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4390454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4391454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4392454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4393454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4394454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4395454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4396f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4397454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4398454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4399454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4400454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4401454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4402454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4403454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4404454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4405454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4406454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4407454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4408454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4409454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4410454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4411454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4412454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4413454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4414454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4415f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4416454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4417019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 44184c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4419f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4420625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4421625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4422625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4423625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4424625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4425625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44271bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4428625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4429625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4430625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4431625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44329a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4433625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4434625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4435625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4436625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 443783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4438625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4439625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44407b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44417b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44427b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44437b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44447b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44457b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44467b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44477b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44507b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44517b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44527b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44537b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44547b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44557b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44567b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4457b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4458c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4459f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4460c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 44612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 44628327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 44638327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4464a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4465a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 44662fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (E->isLogicalOp()) { 44672fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // These need to be handled specially because the operands aren't 44682fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // necessarily integral nor evaluated. 44692fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis bool lhsResult, rhsResult; 44702fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44712fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 44722fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We were able to evaluate the LHS, see if we can get away with not 44732fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 44742fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (lhsResult == (E->getOpcode() == BO_LOr)) 44752fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult, E); 44762fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44772fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 44782fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (E->getOpcode() == BO_LOr) 44792fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult || rhsResult, E); 44802fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis else 44812fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult && rhsResult, E); 44822fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44832fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } else { 44842fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Since we weren't able to evaluate the left hand side, it 44852fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // must have had side effects. 44862fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 44872fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44882fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Suppress diagnostics from this arm. 44892fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis SpeculativeEvaluationRAII Speculative(Info); 44902fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 44912fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 44922fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 44932fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (rhsResult == (E->getOpcode() == BO_LOr)) 44942fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(rhsResult, E); 44952fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44962fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44972fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44982fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return false; 44992fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 450054176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4501286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4502286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 45034087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45044087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 45054087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4506f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 45074087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4508745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4509745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 45104087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45114087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4512745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 45134087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45144087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45154087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 45161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 45174087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 45181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 45194087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 45204087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4522131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4523131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4524131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4526131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 45271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4528fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4529fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 45301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4531fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4532fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4533131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45344087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 45352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4536131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4537131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4538131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4540131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4541131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4542131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4543131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45444087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45454087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4547286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4548286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4549286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 45501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4551745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4552745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4553286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4555745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4556286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4558286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4559529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4560286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4561286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4562b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 45632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4564131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 45652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4566131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 45672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4568131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 45692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 45701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4571131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 45722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4573131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 45742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 45751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4576fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4577fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4578286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4579286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 45801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4581ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4582625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4583745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4584745f5147e065900267c85a5568785a1991d4838fRichard Smith 4585745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4586745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 45873068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4588a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4589745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 45903068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4591a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4592625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4593625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4594625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 459565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 459665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 459765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 459865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 459965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 460065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 460165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 460265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 460365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 460465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 460565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 460665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 46075930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 46085930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 46095930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 46105930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 46111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 461265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 461365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 46149e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 46159e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 46165bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4617f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4618ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4619ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4620c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4621ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4622ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4623f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46249e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4625b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4626b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4627b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 462874f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 462974f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46319e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 46329e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 46339e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4634f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46359e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4636c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4637c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4638c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 46399e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 46405bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4641a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 464215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 464315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 464415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4645f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4646f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4647f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4649f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4650f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4651f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4652f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4653f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4654f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4655f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4656f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4657f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46584992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 46594992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 46603068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4661180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 466274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 4663180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4664a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 466515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 466615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 466715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 466815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 466915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 467015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 467115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 467215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 467315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 467415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 467515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 467615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 467715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 467815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 467915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 468015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 468115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 468215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 468315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 468415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4685ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4686625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 468782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 468882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 468982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 469082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 469182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 469282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 469382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 469482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 469682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 469782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4698f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4699f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4700f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4701f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4704f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4705f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4706f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4707f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4708f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4709f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4710f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4711f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4712f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4713f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4714f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4715f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4716f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4717f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4718f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4719f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4720f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4721f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4722f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4723f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4724f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4725f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4726f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4727f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4728f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4729f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4730f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4731f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4732f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4733f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4734f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4735f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4736f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4737f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4738f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4739f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4740625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4741625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4742625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4743625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4744625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4745625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4746625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4747625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4748ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 47493068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 47503068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4751b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4752b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4753b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4754b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4755b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4756b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4757b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4758b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4759b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4760b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4761b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4762b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4763b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4764b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4765b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4766b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4767b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4768b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4769b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4770b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4771b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4772b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4773b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4774b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4775b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4776b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4777b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4778b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4779b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4780b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4781b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4782b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4783b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4784b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4785b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4786b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4787b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4788b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4789b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 479026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 479126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 479226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 479326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 479426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 479526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 479626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 479726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 479826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 479926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 48002ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 48012ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4804a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4805a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4806a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 48071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue LHSVal; 4808745f5147e065900267c85a5568785a1991d4838fRichard Smith 4809745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4810745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4811f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4812d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4813745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 481430c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4815745f5147e065900267c85a5568785a1991d4838fRichard Smith 48161aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &RHSVal = Result; 481742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 481842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4819c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4820a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4821a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 48222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 482347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 482442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 482547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 482647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 482742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 482842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 482942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 483042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 48312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4832c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 483347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 483447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 483547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 483642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 483742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 483842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 483965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 484065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 484165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 484265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 484365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 484465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 484565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 484665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 484765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 484865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 484965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 485065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 485165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 48525930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 48535930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 48545930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 48555930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 48561aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 485765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 485865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 485965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 486042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4861c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4862f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4863a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4864c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4865c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 486642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4867a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 486832fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4869f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 48707b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 48717b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48727b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 48737b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 48747b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 48757b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 48777b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 48787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 48797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48807b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 48817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4882c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4883c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4884c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 48852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 48863df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 488754176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4888f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 48893df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 48903df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4891789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4892789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4893789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 48943df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 48952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4896789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4897789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4898091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4899789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4900091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4901091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4902091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4903091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4904091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4905789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4906789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4907789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4908789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4909789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4910789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4911789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4912789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4913925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith // operand, and must not overflow the corresponding unsigned type. 4914789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4915789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4916925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith else if (LHS.countLeadingZeros() < SA) 4917925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith CCEDiag(E, diag::note_constexpr_lshift_discards); 4918789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4919789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 49213f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4923789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4924789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4925091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4926789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4927091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4928091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4929091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4930091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4931091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4932789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4933789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4934789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4935789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4936789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4937789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4938789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4939c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 49403f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4942c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4943c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4944c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4945c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4946c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4947c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4948b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4949a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4950a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 49518b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 49525d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 49535d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 49545d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 49555d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 49569f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 49579f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 49589f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 49599f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4960e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4961e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 49628b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4963af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4964af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4965af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 49661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4967af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 49688b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 49698b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4970a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4971af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 49728b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 49738b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4974af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4975e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4976e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4977e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4978e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4979f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4980f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4981f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4982f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4983f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4984f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4985e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 49864f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4987e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 49884f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4989e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4990a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4991f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4992f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 49930518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4994f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4995f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4996a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4997f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4998f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4999f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5000f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5001f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5002f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5003f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5004f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5005f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5006f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5007f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5008f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5009f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5010f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5011f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5012f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5013f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5014180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 501574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5016f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5017180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5018f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5019f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5020f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5021f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5022fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5023fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 50248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 50258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 50268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 50278ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5028f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 50308ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 50318ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 50328ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 50338ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 50348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 50358ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 50368ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 50378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 50388ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 50398ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5040f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 50428ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 50438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 50448ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50458ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5046f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50478ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 50488ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 50498ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5050f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5051f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50528ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 50538ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5054ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5055cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5056fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 50578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 50588ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50598ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5060f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50618ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 50628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5063f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5064cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5065cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5066cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5067f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5068cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5069cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5070cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5071f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5072f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5073cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 5074cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5075cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5076cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5077cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5078cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5079cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5081cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5082cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 50837c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5084cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5085cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 50868ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 50878ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 50888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 50898ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 50908ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5091b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 509275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 50934c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 509475a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 509575a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5096f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 50972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 50984c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 50994c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5100f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 51012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5102c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5103f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5104f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5105f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5106f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5107f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5108789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5109789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5110789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5111789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5112789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5113f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5114f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5115f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5116f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5117f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5118f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5119f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5120f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5121f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5122f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5123f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5124f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 512606a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5127a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 51281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5129732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5130732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 51318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 51328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 513382206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5134b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 513582206e267ce6cc709797127616f64672d255b310Anders Carlsson 513646a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 513746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 513846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 513946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 514046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 514146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 514246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 514346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 514446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 514546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 514646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 514746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 51484d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 514946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 515046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 515146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 515246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 515346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 515446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 51551d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 51561d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 515746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 515846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 515946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 516046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 516146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 516246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 516346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 516446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 516546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 516646a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 516746a523285928aa07bf14803178dc04616ac85994Eli Friedman 5168e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 516946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 517046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 517133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 517233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 517333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 517433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5175ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5176f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 517746a523285928aa07bf14803178dc04616ac85994Eli Friedman 51787d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 517946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 51807a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 51817a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 518246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5183c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 518446a523285928aa07bf14803178dc04616ac85994Eli Friedman 518546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 518646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 518746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 518846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 518946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 519046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 51914efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5192c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 51934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5194131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 51954efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 51964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 519746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5198732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5199b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5200a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5201be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 520265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 520365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 520465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 520565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 520665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 520765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 520865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5209be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5210be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5211be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 521230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5213f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5214f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5215732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 52161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 521746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5218c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5219c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5220efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 522187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5222b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 52234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5224dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5225dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5226f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5227f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5228f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5229dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5230f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5231dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5232b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5233efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5234dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5235dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 52364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5237a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5238a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5239f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 52402bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 52414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 524246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5243f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 52441725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 52451725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 524646a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 52471725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 52482217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 524946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 525046a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 525146a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 525246a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5253732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5254c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5255c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5256c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5257c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 525846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 525946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 52601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 526146a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5262a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 52632bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5264722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5265722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5266f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5267f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5268f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5269f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5270f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5271722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5272722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5273722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5274722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5275722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5276722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5277664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5278722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5279f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5280f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5281f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5282f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5283f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5284722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5285722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5286722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 52878327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5288664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5289664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5290664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5291ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5292ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5293ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5294ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5295295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5296295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5297295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5298295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5299f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5300d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5301d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5302d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5303d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5304770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 53058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5306d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5307d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5308d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 53098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5310d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 53128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 53138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 53148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5315d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 531651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5317f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5318f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5319f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5320f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5321019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5322d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53235db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5324d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5325d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 53268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 53272217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5328abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5329abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5330ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 533151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5332d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5333d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5334d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5335d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5336c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 53378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5338d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5339d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53404ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5341db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5342db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5343db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5344db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5345db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5346db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5347db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5348db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5349db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5350db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5351db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5352db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5353db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5354db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5355db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5356db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5357db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5358db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5359db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5360db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5361db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5362db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5363db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5364db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5365019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5366180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 53678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 53688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 53698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5370019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5371019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5372019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5373019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5374019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 53757cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 53767cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 53777cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 537834a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 537934a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 53807cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 53811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5382db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5383db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5384db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5385f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5386f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5387f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5388f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5389db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 53909e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 53919e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 53929e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 53934572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 53949e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5395f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5396f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5397f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5398f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 53995db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54005db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 54015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 54025db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 54035db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 54045db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54065db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 54075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54085db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54095db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 54111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 54125db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 54135db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 54145db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 54155db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 54165db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54175db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 54185db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54195db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5420019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5421019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5422019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5423abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 542443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 542543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 542643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 542743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 542843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 542943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 543043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 543143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 543243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5433abd3a857ace59100305790545d1baae5877b8945John McCall} 5434abd3a857ace59100305790545d1baae5877b8945John McCall 5435abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 543643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 543743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 543843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 543943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 544043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 544143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 544243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 544343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 54448327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 544543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 544643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5447abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5448abd3a857ace59100305790545d1baae5877b8945John McCall} 5449abd3a857ace59100305790545d1baae5877b8945John McCall 54505db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 54515db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5452f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 54547993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 54552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 54567993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 54577993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 54585db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54595db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54605db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 54615db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5462019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5463d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5464e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5465e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 546696e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 54675db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5468745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5469745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5470d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5471745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5472d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5473d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5474d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5475f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5477d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 54787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5480d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 54817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5483d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 54847b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5486d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 54877b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5488d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 54897b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 54907b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 54917b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 54927b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5493d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5494d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5495d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5496d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5497d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5498d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5499d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 55018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 55021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55032a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 55042a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5505c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 55062a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55072a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 55084efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5509c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5510c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5511c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 55124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 55132a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55142a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 55154efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 55164efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5517c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5518c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 55194efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5520f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 55212a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5522f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5523f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5524f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5525f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5526f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5527f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 55282a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 55294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 55304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5531d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5532a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 55339ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 55349ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55359ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5536770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 55378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5538f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 55391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55409ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5541f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 55428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 55431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55441aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 55458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 55468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 55481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55497ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 55507ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 55538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55549ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 55568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5557b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 555896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 55597ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5560b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5561b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 55621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5563b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5564b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5565c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 55668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5567b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5568b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55697ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5570f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 55717ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 55727ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 55737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 55747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 55757ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 55767ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 55777ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 55787ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 55797ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 55807ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 55817ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 55827ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 55837ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 55847ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 55868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5587b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5588b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5589b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5590b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5591b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5592b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5593b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5594b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5595b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5596b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5597b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5598b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5599b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5600b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5601b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5602b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5603b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5604b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5605b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5606b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5607b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5608b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5609b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5611b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 56138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 56148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 56158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 56168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 56178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 56188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 56198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 56208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 56218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 56228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 56238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 56248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 56258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 56264d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 56278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 56288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 56298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 56308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 56318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 56328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 56338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 56348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 56358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 56368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 56378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 56388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 56391d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 56401d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 56418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 56428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 56438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 56448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 56458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 56468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 564733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 564833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 564933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 565033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5651ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 56528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 56538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 56557a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 56567a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 56578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5658c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 56592bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 56608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 566146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 56628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5663f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 56648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5666b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 56678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5668b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5669b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 56718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 56728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 56738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 56768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 56778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 56788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5683c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5684c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 56858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 56888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 56898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 56908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56918786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5695c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5696c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5697c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5698c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 56998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5702b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 57038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5704b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 57059ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 57078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 57088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 57128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5713b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5714ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 57158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57181725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5719f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5720f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 57218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 57258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5732c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5733c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5734c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5735c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 57368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5737ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 57381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 57409ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 57419ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5742f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 57442ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 57452ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5746745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5747745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5748f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 57491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5750f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5751745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5752f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5753a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 57543f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 57553f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5756ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5757f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5759a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5760a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5761a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5762a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5763a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5764a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5765a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5766a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5767a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 57683f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 57692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5770a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5771a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5772a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5773a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5774a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5775a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5776a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5777a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5778a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 57793f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 57802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 57813f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5782f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 57833f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 57843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 57853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 57863f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 57871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 57893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 57903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 57913f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 57923f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 57933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 57943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 57953f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 57963f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 57973f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 57983f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 57993f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 58003f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 58013f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5802f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 58031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 58043f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 58053f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 58061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 58073f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 58083f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 58093f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 58103f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 581196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 581296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 581396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 581496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 581596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 581696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 581796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 581896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 581996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 582096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 582196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 582296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 582396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 582496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 582596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 582696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 582796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 582896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 582996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 583096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 583196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 583296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 583396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 583496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 583596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 583696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 583796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 583896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 583996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 584096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5841f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5842f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5843f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 584496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 584596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 584696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 584796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 584896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 584996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 585096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 585196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 585296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 585396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 585496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5855ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5856ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5857f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5858ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5859ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 586096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 586196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 586296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 586396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 586496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 586596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 586696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5867f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 586896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 586996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 587096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 587196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 587296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 587396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 587496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 587596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 587696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 587796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 587896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 587996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 588096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 588196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 588296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 588396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 588496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 588596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 588696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 588796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 588896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 588996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 589096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 589196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 58927ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 58937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 58947ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 58957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 58967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 58977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 58997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 59017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 59027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 59037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 59057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 59087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59097ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 59107ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 59117ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 59129ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5913aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5914aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5915aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5916aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5917aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5918aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5919aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5920aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5921aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5922aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 59231aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { return true; } 5924aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5925aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5926aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5927aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5928aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5929aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5930aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5931aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5932aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5933aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5934aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5935aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5936aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5937aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5938aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5939aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5940aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5941aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5942aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 594351f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5944f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5945f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 59461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { 5947c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5948c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5949c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5950c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5951c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5952c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5953c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5954c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 59551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 595659b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5957575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 59581e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 59596dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5960efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5961efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5962efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 59636dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59641e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5965efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5966efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5967efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 59686dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59691aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(F); 5970efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5971efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5972efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5973660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 59741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 597569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 598151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5982180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 598383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5984180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5985cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5986180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 598751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5988180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 598983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5990180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5991180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5992180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5993aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5994c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 59955cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_nonliteral) 5996c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5997c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 59985cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 5999aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6000aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 6001c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 60025cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) << E->getType(); 6003c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6004f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 60055cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 6006660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6007f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6008660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6009660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6010660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6011660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 601283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 601383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 601483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 601583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 601683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 601783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 60187ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 601951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 602051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 602151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 602269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 602369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6024180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6025180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6026180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6027180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 602869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 602969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 603069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 60311aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return Evaluate(Result, Info, E); 603269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 603369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6034f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6035f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6036f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 603751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 603851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 603951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 60401aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!::Evaluate(Result, Info, E)) 6041f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6042f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6043f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6044f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 60451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.setFrom(Info.Ctx, Result); 60461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) 6047f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6048f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6049f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 60501aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith // Check this core constant expression is a constant expression. 605183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6052f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6053c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 605451f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 605556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 605656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6057c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6058c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 605951f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6060ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6061ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6062ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6063ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6064ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6065ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6066ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6067ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 60682d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 60692d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6070e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 60714e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 60721445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 60731445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6074f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6075f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 607656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 607756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 60784ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 60794ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6080c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 608151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 60821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith HandleConversionToBool(Scratch.Val, Result); 6083cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6084cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 608580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 608680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 608780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 608880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 608980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6090c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 609180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 609280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6093c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6095c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6096c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6097a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6098a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 60994ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 61001b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 61011b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6102efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 610383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 610483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 610583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 610683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 610783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 61081aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.moveInto(Result.Val); 610983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6110b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6111b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6112099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6113099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6114099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 61152d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 61162d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 61172d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 61184e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 61192d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 61202d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6121099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6122099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6123099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6124099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6125099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6126099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6127099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6128099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6129099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 613051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 613151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 613251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 613351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 61344e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() && 613551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 613651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 613783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 613883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 613951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 614051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 614151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 614283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 614383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 614483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 614583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 614683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 614783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 614883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6149099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6150099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 615151f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 615251f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 61534ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 61544fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 615551f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 615645b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 615751fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 61584ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 61591e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6160393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6161393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6162a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 61631c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 616451f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6165c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 616651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 61671c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 616851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 61691c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 617051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6171d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6172e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6173e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6174e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6175e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6176e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6177e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6178d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6179d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6180d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6181d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6182d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6183d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6184d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6185d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6186d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6187d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6188d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6189d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6190d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6191d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6192d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6193d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6194d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6195d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 619651f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6197d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6198d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6199d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6200d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6201d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62023c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 62033c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6204d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6205d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6206d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6207d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6208d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6209d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6210d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6211d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6212d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62133c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 62143c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 62153c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6216d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6217d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6218d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 621951f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6220d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6221d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6222d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6223d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6224d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6225d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6226d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6227d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 62282ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6229d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6230d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6231d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6232d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 623363c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6234d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6235d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6236d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6237d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6238d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6239d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6240d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6242d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6243d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6245d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6246d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6247d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6248d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6249d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6253e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 62569be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6257d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 62589fcce65e7e1307b5b8da9be13e4092d6bb94dc1dRichard Smith case Expr::UserDefinedLiteralClass: 6259d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6260d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6261d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6262d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6263d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6264d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6265d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6266d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6267d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 62684765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6269d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6272d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6273d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6274ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCNumericLiteralClass: 6275ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCArrayLiteralClass: 6276ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCDictionaryLiteralClass: 6277d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6278d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6279d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6280d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6281d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6282d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6283ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCSubscriptRefExprClass: 6284d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6285d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6286d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6287d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 62887cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6289be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6290c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 629161eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6292f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 629303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 62944b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6295276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6296cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 629701d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6298cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6299cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6300ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6301d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6302d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6303d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6304d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 630591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 630691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 630791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 630891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6309d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6310d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6311f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6312f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6313d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6314d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6315ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCBoolLiteralExprClass: 6316d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6317ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6318d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 63196ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 63204ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor case Expr::TypeTraitExprClass: 632121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6322552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 63232e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6324d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6325d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 63266cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 632705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 632805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 632905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6330d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6331180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6332d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6333d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6334d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6335359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith case Expr::DeclRefExprClass: { 6336d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6337d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6338359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith const ValueDecl *D = dyn_cast<ValueDecl>(cast<DeclRefExpr>(E)->getDecl()); 63394e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && 6340359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith D && IsConstNonVolatile(D->getType())) { 6341d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6342d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6343d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6344d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6345d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6346d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6347d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6348d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6349d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6350d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6351db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6352db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6353db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6354099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6355099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6356099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6357099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6358099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6359099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6360099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6361d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6362d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6363d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6364359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith } 6365d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6366d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6367d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 63682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 63692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 63702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 63712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 63722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 63732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 637405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 637505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 637605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 63782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 63792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 63802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 63812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 63822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 63832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 63842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6385d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6386d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6388d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6389d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6390d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6391d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 639251f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 639305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6394d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6395d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6396d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6397d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6398d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6399f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6400f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6401f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6402f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6403d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6404d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6405d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6406d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6407d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6408d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 64092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 64102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 64112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 64122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 64132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 64142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 64152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 64162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 64172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 64182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 64192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 64202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 64212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 642205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 642305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 642405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6426d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 64282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 64292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 64302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 64312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 64322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 64332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 64342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 64352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 64362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 64372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 64382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 64392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 64402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 64412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 64422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 64432de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6444d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6445d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 64462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 64472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 644851f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6449d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 64503b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6451a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6453d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6455a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6456d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6458d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6459d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6460d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 64612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 64624e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().C99) { 6463d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6465d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6466d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6467d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6468d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6469d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6470d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6473d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6474d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 64762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 64772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6478d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6479d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6480d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6483d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 64842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6485a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6486d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6487d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6488d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6490d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6495d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6496d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6497d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6498d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6500d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 650132cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6502f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6503d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 65042116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 65052116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 65062116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 65072116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 65082116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 65092116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 65102116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 65112116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 65122116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 65132116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 65142116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 65152116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 65162116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 65172116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 65182116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 65192116b144cf07f2574d20517187eb8863645376ebRichard Smith } 65202116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6521eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6522eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 65237a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 65247a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6525eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6526eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6527eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6528d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6529eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6530eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6531eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 653356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 653456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 653556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 653656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 653756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 653856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 653956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 654056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6541a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 654256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 654356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6544d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6545d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6546d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6547d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6548d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6549d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6550d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6551d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 655280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 655380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6554d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6555d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6556d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 655763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6558f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6559f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 656063fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6561d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6562d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6563d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6564d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6565d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6566d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6568d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6569d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6570d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6571d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6572a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6573d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6574d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6575d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6576d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6577d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6578d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6579d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6580d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6581d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6582d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6583d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 65843026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6586d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6588f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6590f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6591f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6592f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6593f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6594f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 65974c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 65984c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6599dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6600dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 66014c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 66024c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6603dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6604f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6605f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6606dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 66074e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6608f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6610d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6611d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6612d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6613d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6614d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6615f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6617f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6618f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6619f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 66204e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6621f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6623f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6624f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6625f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6626d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6627d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6628d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 66294c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 663070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 663170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 663270488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 663370488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 66344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 66354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 66364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 66374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 66384e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie assert(Ctx.getLangOpts().CPlusPlus); 66394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 664070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 66414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 66424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 66434c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 66444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 66454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 66474c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 66484c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66494c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 66504c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 66514c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 66524c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 66534c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 66544c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 66554c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 66564c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66574c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 66584c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6659745f5147e065900267c85a5568785a1991d4838fRichard Smith 6660745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6661745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6662745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6663745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6664745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6665745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6666745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6667745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6668745f5147e065900267c85a5568785a1991d4838fRichard Smith 6669745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6670745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6671745f5147e065900267c85a5568785a1991d4838fRichard Smith 6672745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6673745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6674745f5147e065900267c85a5568785a1991d4838fRichard Smith 6675745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6676745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6677745f5147e065900267c85a5568785a1991d4838fRichard Smith 6678745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6679745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6680745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6681745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 668283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6683745f5147e065900267c85a5568785a1991d4838fRichard Smith 6684745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6685745f5147e065900267c85a5568785a1991d4838fRichard Smith 6686745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6687745f5147e065900267c85a5568785a1991d4838fRichard Smith 66881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 66891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 6690745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 66911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 6692745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6693745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6694745f5147e065900267c85a5568785a1991d4838fRichard Smith 6695745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6696745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6697