ExprConstant.cpp revision 8e55ed1ad3acf9c7f8424aa7d326b3b2c18e943b
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 415c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 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 483dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 484dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 4867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 487c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 488dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 48951e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 49051e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 491dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 49251e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 493c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 495c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 502099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 503099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 504099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 505099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 506099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 507099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 510745f5147e065900267c85a5568785a1991d4838fRichard Smith 511745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 512745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 513745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 51474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 51574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 516745f5147e065900267c85a5568785a1991d4838fRichard Smith } 517c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 53474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 53574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 53674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 53774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 53874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 53974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 54074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 54174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 54274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 54374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 54474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 54574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 54674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 54774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 54874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 54974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 55074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 55208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 55308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 554b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 555b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 556b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 557b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 559b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 560b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 561b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 562b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 563b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 564b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 568b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 573b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 577b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 578b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 57908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 58008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 5811aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments) 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 58383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 58408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 58608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 58708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 59608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 5985ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 5995ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6065fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 6101aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue &Arg = Frame->Arguments[ArgIndex]; 6111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 61408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 615bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 616d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 61808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 61908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 647bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 649d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 65008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 651f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 652f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 653f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 655f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 657f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 658f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 659f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 660f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 662f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 664f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 665f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 666f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 667f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 668f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 669f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 670f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 6711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &v) const { 672f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 6731aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(FloatReal, FloatImag); 674f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 6751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(IntReal, IntImag); 676f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 6771aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &v) { 67856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 67956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 68056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 68156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 68256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 68356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 68456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 68556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 68656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 68756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 68856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 689f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 690efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 691efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 693efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 69483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 6950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 696efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 69847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 699625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 70083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 703efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (Designator.Invalid) 7061aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, APValue::NoLValuePath(), CallIndex); 7071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 7081aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, Designator.Entries, 7091aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator.IsOnePastTheEnd, CallIndex); 710efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 7111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(ASTContext &Ctx, const APValue &V) { 71247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 71347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 71447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 71583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7161aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator = SubobjectDesignator(Ctx, V); 7170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 71983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 72283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 723b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 724b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 725b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 727b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 731b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 732b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 736b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 747b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 748b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 749b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 750b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 752b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 753b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 754b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 755b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 756b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 75786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 75886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real); 75986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Designator.addComplexUnchecked(EltTy, Imag); 76086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 761b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 762b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 764b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 76556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 766efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7891aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(getDecl(), isDerivedMember(), Path); 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 7911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &V) { 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 856c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 857b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 858b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 859b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 860b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 861b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 862b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 863b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 864b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 865b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 866c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 867c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 868c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 869c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 870c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 871c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 872f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 87387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 8741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); 87583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 87683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 87783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 87883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 879efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 880efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 88487eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 8851aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 886d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 887d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 888f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 889f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 890f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8914efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8924efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8934efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 894180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 895180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 896180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 897180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 898180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 899180f47959a066795cc0f409433023af448bb0328Richard Smith} 900180f47959a066795cc0f409433023af448bb0328Richard Smith 9011bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 902180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 903180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 904180f47959a066795cc0f409433023af448bb0328Richard Smith 905180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 906180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 90842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9091bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 910180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 91242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 91542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9181bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9191bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 921b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 922b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 923b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 924b78ae9716576399145786b93f687943f8b197170Richard Smith } 925180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 926180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 927180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 928180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 929180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 93047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 931180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 932180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 933180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 934180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 935180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 936180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 937180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 938180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 939180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 940180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 941745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 942745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 943745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 944745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 945745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 946745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 947745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 948745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 949180f47959a066795cc0f409433023af448bb0328Richard Smith } 95042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 95142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 95283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 95383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 95483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 95583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 95683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 95783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 95883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 95983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 96083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 96183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9629a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 9631aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// value for an address or reference constant expression. Return true if we 9641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// can fold this expression, whether or not it's a constant expression. 96583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 96783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 96883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 969c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 970c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 971c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 972b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 973b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 974b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 975c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 976c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 977c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 97883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 97983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 98083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 98183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 982c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 98383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 98561e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 98669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 987f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 98883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 98983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 99083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 991b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 992b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 993b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 995b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 996b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 997b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 998b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 999b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 100083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 100161e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1003b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1004c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1006c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 100783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1008c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 100983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1010c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1011c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 101269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 101347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 101447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 101551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 101651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 101751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 101851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 101951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 102051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 102151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 102251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 102351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 102451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 102551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 102651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 102751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 102851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 102951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10309a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 103183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 103283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 103383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 103483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 103583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 103683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 103783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 103883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 103983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 104083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 104183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 104283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 104383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 107483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 107583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 10761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LVal.setFrom(Info.Ctx, Value); 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10789a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10829a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10839a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10849e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10869e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10879e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 10889e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 108983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 10909e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10919e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 109265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 109365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 10940dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 109565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 109665ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 10971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { 10983554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 10993554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1100e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1101e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11023554283157190e67918fad4221a5e6faf9317362John McCall return true; 11033554283157190e67918fad4221a5e6faf9317362John McCall } 11043554283157190e67918fad4221a5e6faf9317362John McCall 1105e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1106e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11073554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11090dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11105bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11115bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 11121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool HandleConversionToBool(const APValue &Val, bool &Result) { 1113c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1114c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1115c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1116c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1117c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 111841bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1119c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1120c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1121a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1122c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1123c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1124c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1125c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1126c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1127c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1128c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1129436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1130e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1131e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1132e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1133e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1134e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1136cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1137180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1138180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 113965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1140c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1143c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1144c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1145c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1146c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 11491aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 1150d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis if (!Evaluate(Val, Info, E)) 1151c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1152d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis return HandleConversionToBool(Val, Result); 11534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1155c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1156c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1157c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1158c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1159789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1160c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1161c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1162c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1163c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1164c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1165c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1166c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1167a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1168575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1171a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1172c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1173c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1174c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1175c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1176a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1177a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1179c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1180c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1181c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1182a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1183c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1184c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1185c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1187c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1188a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1189a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1190f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1191f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1192f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1193f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1194a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1195a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1196a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 11979f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1198575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1199a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1200a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1201a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1202c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1203c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1204c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1205c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1206c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1207c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1208c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1209c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1210c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1211a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1212a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1213e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1214e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 12151aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue SVal; 1216e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1217e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1218e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1219e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1220e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1221e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1222e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1223e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1224e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1225e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1226e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1228e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1229e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1260b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1261b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1262b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1263b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1264b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1265b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1266180f47959a066795cc0f409433023af448bb0328Richard Smith 1267b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1268b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1269b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1270b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1271b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1272b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1273180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1274180f47959a066795cc0f409433023af448bb0328Richard Smith 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1276e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1277e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1278180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1279180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1281180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1282e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1283180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1284180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1285180f47959a066795cc0f409433023af448bb0328Richard Smith } 1286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1287180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1288180f47959a066795cc0f409433023af448bb0328Richard Smith} 1289180f47959a066795cc0f409433023af448bb0328Richard Smith 1290b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1291180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1292180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1293180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1294180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1295180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1296b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1297180f47959a066795cc0f409433023af448bb0328Richard Smith} 1298180f47959a066795cc0f409433023af448bb0328Richard Smith 1299b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1300180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1301180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1302180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1303180f47959a066795cc0f409433023af448bb0328Richard Smith 1304180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1305b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1306180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1307180f47959a066795cc0f409433023af448bb0328Richard Smith } 1308180f47959a066795cc0f409433023af448bb0328Richard Smith 1309b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1310b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1311b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1312b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1313180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1314b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1315b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1316180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1317180f47959a066795cc0f409433023af448bb0328Richard Smith 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1319180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1320180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1322180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1323180f47959a066795cc0f409433023af448bb0328Richard Smith} 1324180f47959a066795cc0f409433023af448bb0328Richard Smith 1325180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1326180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1328180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1329180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1330180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1331180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1332180f47959a066795cc0f409433023af448bb0328Richard Smith 1333180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1334180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1335b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1336180f47959a066795cc0f409433023af448bb0328Richard Smith} 1337180f47959a066795cc0f409433023af448bb0328Richard Smith 1338d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1339d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1340d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1341d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1342d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1343d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1344d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1345d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1346d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1347180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 134874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 134974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1350180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1351180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1352180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1353180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1354180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1355180f47959a066795cc0f409433023af448bb0328Richard Smith } 1356180f47959a066795cc0f409433023af448bb0328Richard Smith 1357180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1358180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 135974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 136074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1361180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1362180f47959a066795cc0f409433023af448bb0328Richard Smith } 1363180f47959a066795cc0f409433023af448bb0328Richard Smith 1364180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1365180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1366180f47959a066795cc0f409433023af448bb0328Richard Smith} 1367180f47959a066795cc0f409433023af448bb0328Richard Smith 1368180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1369180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1370b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1371180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1372180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1373180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1374b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1375b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1376b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1377180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 137874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1379180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1380180f47959a066795cc0f409433023af448bb0328Richard Smith 1381180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1382180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1383b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1384180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1385180f47959a066795cc0f409433023af448bb0328Richard Smith} 1386180f47959a066795cc0f409433023af448bb0328Richard Smith 138786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 138886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 138986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 139086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 139186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 139286024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 139386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 139486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 139586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 139686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 139786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 139886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 139986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 140086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 140186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 140286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 140386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 140486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 140503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1406f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 14081aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith CallStackFrame *Frame, APValue &Result) { 1409d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1410d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1411d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1412745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1413745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1414745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1415745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1416f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1417dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1418177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1419f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1420177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1421177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1422d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 142303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1424099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1425099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1426099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1427745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1428745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1429745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1430745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1431099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1432099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1433099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1434180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1435180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1436180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 14371aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *Info.EvaluatingDeclValue; 1438180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1439180f47959a066795cc0f409433023af448bb0328Richard Smith } 1440180f47959a066795cc0f409433023af448bb0328Richard Smith 144165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 144265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1443f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1444dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 144565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 144765ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1448099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1449099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1450099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1451099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1452099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1453099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1454099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1455099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 145647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1457099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1458099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1459099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1460099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1461099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 146303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 14641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *VD->getEvaluatedValue(); 146547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 146603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 146703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1468c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 146903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 147003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 147103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 147203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 147359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 147459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 147559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 147659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 147759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 147859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 147959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 148059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 148159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 148259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 148359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 148459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 148559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 148659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 148759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1488f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith/// Extract the value of a character from a string literal. 1489f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1490f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith uint64_t Index) { 1491f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1492f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1493f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1494f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1495f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1496f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Lit->getType()->getArrayElementTypeNoTypeQual()->isUnsignedIntegerType()); 1497f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1498f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1499f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1500f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1501f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1502cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 15041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Obj, QualType ObjType, 1505cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1506b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1507b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1508cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1509b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1511aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1512aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1515f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1516cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1517745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1518745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1519745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1520cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 15210069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue *O = &Obj; 1522180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1523cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1524cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1525180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1526cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1528cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1529f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1533aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1534aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1535cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1536f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1537f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1538f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1539f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1540f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1541f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 15421aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(ExtractStringLiteralCharacter( 1543f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Info, O->getLValueBase().get<const Expr*>(), Index)); 1544f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1545f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1546cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1547cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1548cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1549cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 155086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 155186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 155286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 155386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 155486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 155586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 155686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 155786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 155886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 155986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 156086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 15611aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexIntImag() 156286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 156386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 156486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 15651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexFloatImag() 156686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 156786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 156886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1569180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1570b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 1571b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_mutable, 1) 1572b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1573b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1574b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1575b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1576b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1577180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1578180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1579180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1580180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1581180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 15837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 15847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 15857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1586180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1588180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1589180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1590180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1591180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 15927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 15947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 15967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 15977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 15987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 15997098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 16017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1604cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1605180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 160659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 160759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 160859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 160959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1610cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1611180f47959a066795cc0f409433023af448bb0328Richard Smith 1612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1613745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1614745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1615180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1617cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1618cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 16190069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // This may look super-stupid, but it serves an important purpose: if we just 16200069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // swapped Obj and *O, we'd create an object which had itself as a subobject. 16210069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // To avoid the leak, we ensure that Tmp ends up owning the original complete 16220069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // object, which is destroyed by Tmp's destructor. 16230069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue Tmp; 16240069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith O->swap(Tmp); 16250069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith Obj.swap(Tmp); 1626cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1627cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1628cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1629f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1630f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1631f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1632f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1633f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1634f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1635f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1636f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 163786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 163886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1639f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1640f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1641f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1642f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1643f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 164486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 164586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 164686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 164786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1648f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1649f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1650f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1651f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1652f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1653f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1654f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1655f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1656f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1657f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1658f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1659f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1660f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1661f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1662f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1663f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1664f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1665f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1666f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1667f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1668f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1669f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1670f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1671f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1672f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1673f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1674f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1675f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1676f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1677f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1678f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1679f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1686180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1687180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1688180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1689180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1690180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1691f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1692f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 16939ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 16949ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1695180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1696180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1697f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1698f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 16991aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const LValue &LVal, APValue &RVal) { 1700b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1701b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1702b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1703b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 17057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1706c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1707f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1708f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 17107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 171383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 171483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 171583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 171683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 171783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 171883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 171983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 172083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 172183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 172283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 17307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1732c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1733f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1734c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1736c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1737c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1738d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1739d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1740c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1741c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 17423d13c5a1e72ed8f8be9c083791d30643d1b1ec43Daniel Dunbar if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) 1743f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1744f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 17457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17460a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1747f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1748f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 17497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 17507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 17511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 17527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1758f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17697098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 17767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 17777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 17797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17930a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1794f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 17967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1797f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1798c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1799c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 180047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1801f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1802c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1803c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1804c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1805c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1806c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1807c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18101bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 181183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 181283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 181383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 181483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 181583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 181683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 181783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 181883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 181983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 182083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 182183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1823c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1835177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1836cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1837cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1838177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1839cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1840cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1841cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1842cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1843cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1844c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1845cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1846cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1847f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1848f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1849f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1850f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 18511aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RVal = APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0); 1852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1853dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1854cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1855f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1857f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1858f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1859c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1860c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 186159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 186259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 186359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 186459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 186559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 186659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 186759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 186859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 186959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1893745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1894745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1906745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1907745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1908745f5147e065900267c85a5568785a1991d4838fRichard Smith 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1913b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1917e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1919e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1924e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1925e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1927b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1928b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1929b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1944b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1948b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1953d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1954d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1955d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1956d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1957d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1958d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1959d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1964e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1970b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1976b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1977b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1978b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 1979b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1980b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1981b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1982b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1983b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1984b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1985b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1986b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1987e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1988e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 1989b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 1990b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 1991b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 1992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 1993b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 1994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1995b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1997b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 200159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 200259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2003c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2004d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2005d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2006d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2007d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2008d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2009d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2010d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2011d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2012d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2013d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2014d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 20151aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 2016d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2017d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2018d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2019d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2020d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2021d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2022d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2023d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2024d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2025c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2026c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 202783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2028c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2029c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2030c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2031d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2032d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2033d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2034d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2035d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2036d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2037d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2038d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2039d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2040d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2041d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2042d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2043d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2044d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 205051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 205151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20526180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20536180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20546180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20554c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20564c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20574c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20584c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 20596180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 20604c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20614c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20624c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20634c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20644c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20656180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20666180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 20676180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20686180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20696180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 20706180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 20716180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2072c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2073c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2074c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2075c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2076c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2077745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2078745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2079745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2080745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2081745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2082745f5147e065900267c85a5568785a1991d4838fRichard Smith 2083c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2084c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2085c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2087c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2088c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2089099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2090099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2091c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2092c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2093c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2094c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2095c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2096c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2097c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2098c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2099c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2100c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2101180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 21021aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithtypedef SmallVector<APValue, 8> ArgVector; 2103180f47959a066795cc0f409433023af448bb0328Richard Smith} 2104180f47959a066795cc0f409433023af448bb0328Richard Smith 2105180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2106180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2107180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2108745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2109180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2110745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2111745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2112745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2113745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2114745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2115745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2116745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2117745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2118745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2119745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2120180f47959a066795cc0f409433023af448bb0328Richard Smith} 2121180f47959a066795cc0f409433023af448bb0328Richard Smith 2122d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2123745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2124745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 21261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith EvalInfo &Info, APValue &Result) { 2127180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2128180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2129180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2130d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2131745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2132745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2133745f5147e065900267c85a5568785a1991d4838fRichard Smith 2134745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2135d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2136d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2137d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2138180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2139745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 214059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2141180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 214251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2143180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2144180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2145180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2146180f47959a066795cc0f409433023af448bb0328Richard Smith 2147745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2148745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2149745f5147e065900267c85a5568785a1991d4838fRichard Smith 215086c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 215186c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 215286c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 215386c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 215486c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 215586c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2156745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2157180f47959a066795cc0f409433023af448bb0328Richard Smith 2158180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2159180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2160180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 216183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2162180f47959a066795cc0f409433023af448bb0328Richard Smith } 2163180f47959a066795cc0f409433023af448bb0328Richard Smith 2164610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2165610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2166610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2167610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2168f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor ((Definition->isCopyConstructor() && Definition->isTrivial()) || 2169f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor (Definition->isMoveConstructor() && Definition->isTrivial()))) { 2170610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 21711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS.setFrom(Info.Ctx, ArgValues[0]); 21721aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 21731aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS, Result); 2174610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2175610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2176610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 217751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2178180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2179180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2180180f47959a066795cc0f409433023af448bb0328Richard Smith 2181180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2182180f47959a066795cc0f409433023af448bb0328Richard Smith 2183745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2184180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2185180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2186180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2187180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2188180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2189180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2190745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2191745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2192745f5147e065900267c85a5568785a1991d4838fRichard Smith 2193745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2194180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2195180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2196180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2197180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 219886c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2199180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2200180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2201180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2202180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2203180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2205180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2206745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2207180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2209180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2210180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2211745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2212745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2213745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2214745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2215d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2216d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2217d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2218d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2219d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2220d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2221d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2222d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2223d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2224d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2225d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2226d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2227d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2228d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2229d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2230d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2231d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2232d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2233d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2234d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2235d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2236745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2237d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2238d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2239d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2240d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2241d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2242180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2243d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2244180f47959a066795cc0f409433023af448bb0328Richard Smith } 2245745f5147e065900267c85a5568785a1991d4838fRichard Smith 224683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 224783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2248745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2249745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2250745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2251745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2252745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2253745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2254745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2255180f47959a066795cc0f409433023af448bb0328Richard Smith } 2256180f47959a066795cc0f409433023af448bb0328Richard Smith 2257745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2258180f47959a066795cc0f409433023af448bb0328Richard Smith} 2259180f47959a066795cc0f409433023af448bb0328Richard Smith 2260d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2261770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 22628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 22631e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2264c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2265c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22661e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2267c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2268c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 22698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2270c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2271c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2272c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 22748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2275f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2276f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 22778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 22781e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2279c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2280c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2281c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2282f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 22831e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2284f85e193739c953358c865005855253af4f68a497John McCall return true; 2285f85e193739c953358c865005855253af4f68a497John McCall return false; 2286f85e193739c953358c865005855253af4f68a497John McCall } 2287f85e193739c953358c865005855253af4f68a497John McCall 2288c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2289c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 22908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 22918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 22928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2293c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 22948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 22958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 22968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 22978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 22988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 22998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2300f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 23018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2302980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 23041e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 23058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 23078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 23088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2309980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 23118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 23128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 23138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 23148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 23151e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2316c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2317980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2318c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2320363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2321363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2323363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2324363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23264423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2327363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2328363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2329ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 23308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2331c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2332c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 233356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 233456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 233556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 233656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 233756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 233856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 233956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 234056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 234156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 234256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 23431e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 234456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 234556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 234656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 234756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 234856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 234956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 235056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 235156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 235274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: For a recursive constexpr call, an outer stack frame might have 235374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // been using this opaque value too, and will now have to re-evaluate the 235474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // source expression. 235556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 235656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 235756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 235856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2359c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2360c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23614efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 23628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 23638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 23648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 23658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2366f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2367f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 23688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 23698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 23708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 23711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RetTy DerivedSuccess(const APValue &V, const Expr *E) { 23728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 237451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 237551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2376f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 237874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 237974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 238074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 238174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 238274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 238374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 238474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 238574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 238674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 238774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 238874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 238974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 239074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 239174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 239274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 239374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 239474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 239574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 239674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 239774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 239874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 239974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 240174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 240274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 240574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 240674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 240774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 240874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 240974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 241074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 241174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 241474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 241574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 24178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 24188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 24198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 24208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 24218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2422dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2423d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2424f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2425f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2426f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2427f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2428f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2429dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2430f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2433f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2434f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 243651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2437f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 24388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 24398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 24408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2442b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 24438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 24468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 24498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 24518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 24538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 24558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 24568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 24578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 245891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 245991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 24603d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 24613d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2462bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2463bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2464bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2465bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 24668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2467c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2468c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2469c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2470c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2471c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2472c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2473c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2474c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2475c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2476e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2477e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2478e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2479f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2480e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2481e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2482e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2483e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2484e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2485e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2486e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2487e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2488e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2489e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 24901aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2491f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2492e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2494e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2495e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 24988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 249974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Cache the value of the common expression. 25008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 25018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 25038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 250474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 25058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2508f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2509f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2510f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2511f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2512f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2513f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2514f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2515f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2516f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2517f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 252574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 25328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 25351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Value = Info.getOpaqueValue(E); 253642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 253742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 253842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 254042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 254142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2542f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 254342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 254442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 254542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 254647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 25478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2548f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2549d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2550e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2551d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2552d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 25536142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 255459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 255559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 255686c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 255759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 255859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 255959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2560f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2561e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2562e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2563e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2564f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2565f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2566e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 256786c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2568e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2569e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2570f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2571f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2572e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2573e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2574f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2575f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2576f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2577f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2578f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 257959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2580b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2581b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 258359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2584b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2585f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25861bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 25871bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 258859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 259059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 259159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 259259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 259359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 259459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2597f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2598f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2599f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2600f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 260159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 260259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 260359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 260459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 260559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2606d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 260759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 260859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 261059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2612d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2613b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2614b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2615b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 261686c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 261786c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 261886c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 261986c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 262086c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 262186c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2622c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2623d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 26241aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2625d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2626c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2627745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2628745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2629f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2630d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 263183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2632d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2633d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2634c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2635c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2636c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2637f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 263871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 263971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 264071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 264171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2643f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2644f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 264551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2646f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2647f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 264851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2649f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 265151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2653f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2654180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2655180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2656180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2657180f47959a066795cc0f409433023af448bb0328Richard Smith 26581aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 2659180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2660180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2661180f47959a066795cc0f409433023af448bb0328Richard Smith 2662180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2663180f47959a066795cc0f409433023af448bb0328Richard Smith 2664180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2665f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2666180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2667180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2668180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2669180f47959a066795cc0f409433023af448bb0328Richard Smith 2670b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2671b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2672180f47959a066795cc0f409433023af448bb0328Richard Smith 2673f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2674180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2675180f47959a066795cc0f409433023af448bb0328Richard Smith } 2676180f47959a066795cc0f409433023af448bb0328Richard Smith 2677c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2678c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2679c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2680c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2681c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26827a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26837a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2684c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26857d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2686c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2687c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2688c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2689c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2690f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2691f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 26921aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RVal; 26939ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 26949ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 26959ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2696f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2697f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2698c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2699c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2700c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2701f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2702c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2703c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27048327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 27058327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 27061aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 27078327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 27088327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 27098327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 27108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 27118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 27138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 27351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 27361aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(this->Info.Ctx, V); 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2747c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2748af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2749c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2750c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2751c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2758d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2759d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2760d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2761d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2762d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2763d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2764d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2765d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2766d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2767d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2769d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 27701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RefValue; 2771d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2806b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 28204efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2821c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2823c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2824c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2825c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2826c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2827c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 28281bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 28291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 28301bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 28311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2832c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 283447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2835c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2836180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2838c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2840c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 28411bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 284283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 284383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 28441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 28454efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 28464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2847770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 28494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 28521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2853c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 28558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 28568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2857bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 28588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 28598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 28608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 28618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 286247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 28638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 28648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 286586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 286686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 28678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 286926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 287026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 287226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2873db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2874c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2879db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2881180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2882180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 288426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 288526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 28864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 28874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 28884efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2889c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2890c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2891c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2892c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2893c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2894efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2895c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2896c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2897c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 28988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 28994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 29021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 29031bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 29041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2905c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2906c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2907c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2908436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2910177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2911177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 291283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2913177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2914177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 29151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2916177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 291750c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 29181aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue V; 2919f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2920f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2921f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 292235873c49adad211ff466e34342a52665742794f5Anders Carlsson} 292335873c49adad211ff466e34342a52665742794f5Anders Carlsson 2924bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2925bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2927af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 293083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 293183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 293283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2940f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 294383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2945bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2946bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 29488cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2949c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2950c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2951c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2952efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 29534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 295547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 295647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 295747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 295847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 295947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 296047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 296147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 296247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 296347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 296447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 296547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 296647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 296747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 29688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2969c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2970c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2971c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2972c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2973c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2974c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2975d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2976d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2977d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2978d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2980d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2981d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2982d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2983180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 29854efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2988c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2989c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2990f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2991c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29923068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2993efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 29941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29953068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 29963068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2997efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2998180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2999180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 3000180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 30013068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 3002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 30033068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 30044efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 3006efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 3007e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 3008e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 300986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 301086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 301186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 301286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 301386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 301486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 301586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 301686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 301786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 301886024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 301986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 302086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 302186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 302286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 302386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 302486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 302586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 302686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 30274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 3028f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 3029f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3030f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3031c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 3032770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 30338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 3034efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 3035efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 30368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 30371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 3038efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3039efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 30402bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 30411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3042efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 30438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 3044f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 30451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 30461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, V); 30478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 30482bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 304951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3050f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 3051f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 30522bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3053efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 30548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3055efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 30568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3057efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 3058ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCNumericLiteral(const ObjCNumericLiteral *E) 3059ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek { return Success(E); } 30608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3061efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 30628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 30638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3064469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3065efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3066f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3067b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3068180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3069180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3070f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3071180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3072180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3073180f47959a066795cc0f409433023af448bb0328Richard Smith } 307456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3075ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30762bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3077f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30782bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3079efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3080c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3082f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3083650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3084efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 30852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 30862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3087e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 30881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3089650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3090650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3091650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3092f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 30931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3094745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3095745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3096efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3098efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3099745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3100efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3101efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3102efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3103efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 31040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 31050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3106650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3107180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3109b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3110650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 31114efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3112efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3113efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 31144efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 31151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 31178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3118650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 311909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 312009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 312109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 312209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 31241d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 31251d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 31262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 312728c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 312828c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3129c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3130c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3131c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 31324cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 313328c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 31344cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 31354cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 31364cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 31374cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 31384cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 31394cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 31400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 314109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31425c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 31435c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 314447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 31455c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3147e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 31485c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3149180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 31505c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3151180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3152180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 31535c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3154180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 31555c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3156b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3157b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 31585c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3159180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 31605c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31615c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 31625c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 31635c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31645c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3166e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3167e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3168e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3169e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3170e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3171e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 317247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 317351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3174404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3176c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3177c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 31781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Value; 3179efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 318009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 318169ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3182efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 318347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 318447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 31851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 318647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 318783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 31880a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3189efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3190efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3191efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 31921aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, Value); 3193efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3194650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3195650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 31962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3197e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3198e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3199e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3200e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 320183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 320283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 320383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3204e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3205e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 32060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 32120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 32136a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 32142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 32156a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 32164efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 32174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3218c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 32191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3220650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 32218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3222180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3223efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 322456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 32258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 32264efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3227f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3228f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3229e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3230e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3231e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3232e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3233e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3242e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3245e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 32461aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 3247e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3249e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 325051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3251e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3257e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3258e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3261e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3263e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 327151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3273e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3274e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3275e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3276e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3277e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3278e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3279e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3281e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3282e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3283e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3284e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3285e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3287f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3290e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3291f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3302e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3303f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3304e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3305e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3307e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3308e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3311e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3314e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3316180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3317180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3318180f47959a066795cc0f409433023af448bb0328Richard Smith 3319180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3320180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3321180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3322180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3323180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3324180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3325180f47959a066795cc0f409433023af448bb0328Richard Smith 3326180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3327180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3328180f47959a066795cc0f409433023af448bb0328Richard Smith 33291aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 333083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 333183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3332180f47959a066795cc0f409433023af448bb0328Richard Smith } 333351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3334180f47959a066795cc0f409433023af448bb0328Richard Smith 333559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3336180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3337180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3338180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3339180f47959a066795cc0f409433023af448bb0328Richard Smith} 3340180f47959a066795cc0f409433023af448bb0328Richard Smith 334151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 334251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 334351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 334451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 334551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 334651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 334751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3348b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3349b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 335051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 335151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 335251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 335351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 335451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 335551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 335651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 335751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 335851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 335951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 336051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3361b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 336251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 336351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3364b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3365b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 336651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 336751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 336851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 336951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 337051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3371b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3372b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 337351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 337451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 337551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 337651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 337751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3378b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 337951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 338051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 338183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 338251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 338351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 338451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 338551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 338651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 338751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 338851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 338951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 339051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 339151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 339251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 339351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 339451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 339551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 339651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 339751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 339851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 339951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 340051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3401b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 340251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 340351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 340483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 340551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 340651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3407ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 3408ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_virtual_base) << RD; 3409ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3410ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3411ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3412b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 341351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 341451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 341559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 341659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 341759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 341859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 341959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 342059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 342159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 342259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 342359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 342459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 34251aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue DerivedObject; 3426f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 342759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3428f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3429f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 343059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 343159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 343259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 343359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 343459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 343559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 343659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 343759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 343859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 343959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 344059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 344159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 344259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 344359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 344459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 344559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 344659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3447180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 344824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 344924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 345024fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 345124fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3452180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3453180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3454180f47959a066795cc0f409433023af448bb0328Richard Smith 3455180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3456ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3457ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3458ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3459180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3460ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3461ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3462ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3463ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3464ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3465ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3466180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3467ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 346883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3469180f47959a066795cc0f409433023af448bb0328Richard Smith } 3470180f47959a066795cc0f409433023af448bb0328Richard Smith 3471180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3472180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3473180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3474180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3475180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3476745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3477180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3478180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3479180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3480180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3481180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3482180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3483180f47959a066795cc0f409433023af448bb0328Richard Smith 3484180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3485180f47959a066795cc0f409433023af448bb0328Richard Smith 3486745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3487745f5147e065900267c85a5568785a1991d4838fRichard Smith 3488745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3489745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3490745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3491745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3492745f5147e065900267c85a5568785a1991d4838fRichard Smith 3493745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3494745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3495745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3496745f5147e065900267c85a5568785a1991d4838fRichard Smith 349783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3498745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3499745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3500745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3501180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3502745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3503180f47959a066795cc0f409433023af448bb0328Richard Smith } 3504180f47959a066795cc0f409433023af448bb0328Richard Smith } 3505180f47959a066795cc0f409433023af448bb0328Richard Smith 3506745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3507180f47959a066795cc0f409433023af448bb0328Richard Smith} 3508180f47959a066795cc0f409433023af448bb0328Richard Smith 3509180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3510180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 351151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 351251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3513ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3514ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3515ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3516ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 351751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 351851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 351951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 35206180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 35216180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 35226180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 35236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 35246180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 35256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 35266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 35276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 35286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3529180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3530180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3531180f47959a066795cc0f409433023af448bb0328Richard Smith 3532c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3533c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3534180f47959a066795cc0f409433023af448bb0328Richard Smith 3535610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 353651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3537180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3538180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3539180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3540180f47959a066795cc0f409433023af448bb0328Richard Smith 354151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 354251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 354351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3544180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3545745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3546f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3548180f47959a066795cc0f409433023af448bb0328Richard Smith} 3549180f47959a066795cc0f409433023af448bb0328Richard Smith 3550180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3551180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3552180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3553180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3554180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3555180f47959a066795cc0f409433023af448bb0328Richard Smith} 3556180f47959a066795cc0f409433023af448bb0328Richard Smith 3557180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3558e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3559e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3560e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3561e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3562e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3563e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3564e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3565e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3566e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3567e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3568e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3569e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3570e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3571e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3572e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 357383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 357483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3575e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3576e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3577e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3578e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3584e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3585e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3587e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3588e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3590e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3593e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3594e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3595e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3596e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3597e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3598e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3600af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3603e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 360559b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 360659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 360759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 360859b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3609770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 361007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 361107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 361259b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 36131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 361407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 361507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 36161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 361707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 361807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 361907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 362007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 362107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 362207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 36231aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 362469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 362507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 362607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 362707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 362851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 36291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 363007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 363191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 363207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 363307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 363407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 363591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 36362217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 363791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 363859b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 363959b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 364059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 364159b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3642c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 364307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 364459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 364559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 364607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 364707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3648c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 36491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3650d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3651e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 365259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 365346a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 365446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 365507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 365646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 365746a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 365846a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 366007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 366146a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 366246a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 366346a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3664f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 366507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 366646a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 366707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 366846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3669c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3670c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 367107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 367207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3673e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3674e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3675e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3676e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3677e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3678e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3679e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3680e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3681e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3682e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3683e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3684e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3685e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3686e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3687e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3688e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3689e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3690e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3691e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3692e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3693e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3694e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3695e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3696e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3697e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3698e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3699e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3700e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3701e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3702e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3703e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3704e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3705e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3706e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3707e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3708e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3709e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3710e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3711e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 371246a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3713c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3714c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 371559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 371659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 371707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 371859b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 371907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 372059b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 372191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 37221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 372359b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 37245f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 372559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 37263edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 37273edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 37283edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 37293edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 37303edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 37313edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 37323edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 37333edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 37343edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 37353edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 37363edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 37373edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 37383edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 37393edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 37403edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 37413edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 37423edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 374359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 37443edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37453edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 37463edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 37473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 37483edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 37493edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 37503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 375159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 375259b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 37533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37543edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 37553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 37563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 37573edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 37583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 37593edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 376059b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 37613edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 376259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 376307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 376459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 376559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 376607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 376751201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 376807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 376991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 377091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 377191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 377291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 377391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 377491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 377591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 377691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 37775f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 377807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 377991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 378091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 378107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 37828327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 378351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 378491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 378591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 378659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3787cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3788cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3789cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3790cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3791cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3792cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3793180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3794cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3795cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3796cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3797180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3798180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3799cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3800cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3801f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3802f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3803cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3804cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3805cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3806cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 380751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3808180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3809180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3810180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3811f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3812180f47959a066795cc0f409433023af448bb0328Richard Smith 3813180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3814180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3815180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3816180f47959a066795cc0f409433023af448bb0328Richard Smith 381751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3818180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3819b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3820180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 382183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3822180f47959a066795cc0f409433023af448bb0328Richard Smith } 3823180f47959a066795cc0f409433023af448bb0328Richard Smith 3824cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3826cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3827cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3828cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3829180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3830180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 383151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3832180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3833cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3834cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3835cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3836cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3837cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3838f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3839cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3840974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3841974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3842ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3843974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3844974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3845974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3846974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 38471aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 3848f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3849f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3850974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3851974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3852745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3853745f5147e065900267c85a5568785a1991d4838fRichard Smith 3854cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3855cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3856180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3857b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3858180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3859cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3860180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 386183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 386283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3863745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3864745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3865745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3866745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3867745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3868745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3869180f47959a066795cc0f409433023af448bb0328Richard Smith } 3870cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3871745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3872cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3873180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3874180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3875180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3876180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 387783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 387883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3879cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3880cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3884f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3886ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3887ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3888ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 38936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 389451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 389551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3896ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3897ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3898ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 389951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 390051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3901b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 390251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 390383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 390451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 390551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 39066180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 39076180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 39086180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 39096180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 39106180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 39116180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 39126180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 39136180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 39146180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 39156180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3917e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3919c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3920c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3924e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3925e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3927b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 392851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3929ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 393051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 393183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 393251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 393351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 393451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3936745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3941cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3942f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3943c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3944c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3945c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3946c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3947f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3948f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3949f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3950770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 39518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 39521aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Result; 3953f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 39541aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith IntExprEvaluator(EvalInfo &info, APValue &result) 39558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3956f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3957973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3958973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 39592ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3960973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 39613f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3962973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39633f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(SI); 39653f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 39663f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 39673f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3968131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 39692ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39702ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 397130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39723f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39731aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(APSInt(I)); 3974575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3975575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3976131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3977131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3978131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3979131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 39802ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39812ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 39821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3983131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3984131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3985131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 39864f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 39874f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 39884f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 39894f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 39901aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 39915930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3992342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3993342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3994342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 39958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 399632fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 39971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 399851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3999f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 4000c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis // FIXME: See EvalInfo::IntExprEvaluatorDepth. 4001c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis bool Visit(const Expr *E) { 4002c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis SaveAndRestore<unsigned> Depth(Info.IntExprEvaluatorDepth, 4003c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis Info.IntExprEvaluatorDepth+1); 4004c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis const unsigned MaxDepth = 512; 4005c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis if (Depth.get() > MaxDepth) { 4006c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis Info.Ctx.getDiagnostics().Report(E->getExprLoc(), 4007c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis diag::err_intexpr_depth_limit_exceeded); 4008c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis return false; 4009c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis } 4010c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis 4011c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis return ExprEvaluatorBaseTy::Visit(E); 4012c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis } 4013c1b66e6003262b284937b542aa159a0c79619ff4Argyrios Kyrtzidis 40148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 40158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 40168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 4017f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40184c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 4019131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40204c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 40214c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 4022131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40234c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 4024043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 4025043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 4026043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 40278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 40288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 40298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4031043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4032043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4033043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4034c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4035043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4036043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4039043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4040043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4042b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4044b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4045f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4047f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 40480518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 40493068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4050131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40513068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 40521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4053ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { 4054ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek return Success(E->getValue(), E); 4055ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } 4056ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek 4057f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 40583f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 405951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4060664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4061664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 406264b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 40630dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 406464b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 406564b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 40666ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 40676ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 40686ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 40696ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 40704ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor bool VisitTypeTraitExpr(const TypeTraitExpr *E) { 40714ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor return Success(E->getValue(), E); 40724ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor } 40734ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor 407421ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 407521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 407621ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 407721ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4078552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4079552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4080552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4081552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4082722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4083664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4084664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4085295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4086ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4087cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4088fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 40898b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 40908b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 40911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 40928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4093664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4094f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4095f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4096f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4097c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4098c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4099c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4100c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4101c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4102c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4103c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4104c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 41051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 410647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4107c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 41088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 410969ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 411069ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4111f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 41121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 4113f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4114f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4115f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4116f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4117f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 4118dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 411930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4120f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 412130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 412230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4123f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4124f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4126f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4127f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4128043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 41294c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4130bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4131973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4132973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4133973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4134973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4135973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4136973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4137973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4138973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4139973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4140973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4141973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4142973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4143973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4144973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4145973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4146973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4147973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4148bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41504c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41514c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4152a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4153a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4154a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4155a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 41567c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4157a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4158a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4159a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4160a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4161a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4162a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4163a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4164a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4165a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4166a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4167a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 41681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 41691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4170a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4171a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4172a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 41731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4174a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4175a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4176a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4177a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4178a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4179a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4180a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4181a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4182a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4183a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4184a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4185a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4186a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4187a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4188a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4189a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4190a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4191a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4192a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4193a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4194a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4195fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4196a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4197a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4198a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4199a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4200a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4201a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4202a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4203a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4204b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4205a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4206a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 420780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 420880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 420980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 421080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 421180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 421280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 421380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 42148e55ed1ad3acf9c7f8424aa7d326b3b2c18e943bDouglas Gregor const Expr *E = LV.getLValueBase().template dyn_cast<const Expr*>(); 421580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 421680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 421780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 421880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 421980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 422080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 422180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 422280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 422380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 422480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 422580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 422680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 422780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 422880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 422980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 423080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 423180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 423280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 423380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 423480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 423580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 423680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 423780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 423880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 423980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 424080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 424180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 424280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 424380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 424480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 424580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 424680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 424780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 424880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 424980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 425080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 425180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 425280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 425380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 425480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 425580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 425680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 425780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 425880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 425980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 426080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 426180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 426242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 426342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 42641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 42651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 42661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 426742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 42681bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 42691bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 42701bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 427142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 427242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 427342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 427442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 427542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 427742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 427842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 427942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 428042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 428142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 428242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 42831bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 428442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 428642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 428742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 42881357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 428942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 429042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4291f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 429242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 429342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 429442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 429542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 429642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 429742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 429842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 429942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 43004f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 430142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 430242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4304180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4305019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 43068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 430764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 430864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 430942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 431042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 431164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4312b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4313b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4314393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4315a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4316cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 431764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 431864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4319c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4320f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 432164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 432264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4323019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4324131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 432680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 432780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4328e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 432921fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4330a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4331bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 433221fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 433321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4334c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4335c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4336c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 433740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43385726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 433940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 434040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 434140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 434240b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 434340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 434440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 434540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43465726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43475726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43485726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43505726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43515726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43525726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 43545f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 43555f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 43565726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 43575726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 43585726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 43595726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 43605726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4361f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4362454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4363454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4364454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4365454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4366454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4367454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4368454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4369454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4370454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4371454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4372454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4373454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4374454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4375454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4376454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4377454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4378454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4379454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4380454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4381454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4382454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4383454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4384454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4385f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4386454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4387454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4388454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4389454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4390454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4391454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4392454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4393454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4394454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4395454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4396454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4397454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4398454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4399454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4400454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4401454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4402454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4403454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4404f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4405454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4406019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 44074c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4408f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4409625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4410625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4411625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4412625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4413625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4414625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4417625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4418625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4419625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4420625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44219a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4422625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4423625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4424625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4425625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 442683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4427625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4428625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44297b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44307b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44317b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44327b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44337b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44347b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44357b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44367b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44377b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44387b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44397b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44407b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44417b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44427b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44437b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44447b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44457b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4446b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4447c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4448f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4449c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 44502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 44518327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 44528327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4453a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4454a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 44552fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (E->isLogicalOp()) { 44562fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // These need to be handled specially because the operands aren't 44572fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // necessarily integral nor evaluated. 44582fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis bool lhsResult, rhsResult; 44592fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44602fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 44612fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We were able to evaluate the LHS, see if we can get away with not 44622fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 44632fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (lhsResult == (E->getOpcode() == BO_LOr)) 44642fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult, E); 44652fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44662fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 44672fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (E->getOpcode() == BO_LOr) 44682fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult || rhsResult, E); 44692fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis else 44702fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(lhsResult && rhsResult, E); 44712fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44722fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } else { 44732fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Since we weren't able to evaluate the left hand side, it 44742fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // must have had side effects. 44752fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 44762fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44772fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Suppress diagnostics from this arm. 44782fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis SpeculativeEvaluationRAII Speculative(Info); 44792fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 44802fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 44812fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 44822fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (rhsResult == (E->getOpcode() == BO_LOr)) 44832fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return Success(rhsResult, E); 44842fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44852fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 44862fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 44872fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return false; 44882fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 448954176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4490286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4491286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 44924087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 44934087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 44944087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4495f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 44964087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4497745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4498745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 44994087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45004087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4501745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 45024087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45034087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45044087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 45051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 45064087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 45071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 45084087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 45094087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4511131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4512131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4513131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4515131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 45161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4517fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4518fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 45191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4520fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4521fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4522131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45234087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 45242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4525131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4526131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4527131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4529131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4530131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4531131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4532131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45334087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45344087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4536286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4537286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4538286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 45391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4540745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4541745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4542286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4544745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4545286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4547286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4548529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4549286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4550286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4551b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 45522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4553131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 45542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4555131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 45562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4557131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 45582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 45591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4560131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 45612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4562131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 45632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 45641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4565fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4566fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4567286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4568286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 45691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4570ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4571625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4572745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4573745f5147e065900267c85a5568785a1991d4838fRichard Smith 4574745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4575745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 45763068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4577a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4578745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 45793068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4580a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4581625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4582625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4583625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 458465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 458565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 458665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 458765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 458865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 458965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 459065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 459165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 459265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 459365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 459465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 459565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 45965930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 45975930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 45985930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 45995930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 46001aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 460165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 460265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 46039e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 46049e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 46055bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4606f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4607ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4608ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4609c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4610ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4611ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46139e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4614b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4615b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4616b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 461774f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 461874f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4619f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46209e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 46219e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 46229e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4623f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46249e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4625c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4626c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4627c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 46289e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 46295bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4630a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 463115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 463215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 463315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4634f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4635f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4636f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4638f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4639f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4640f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4641f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4642f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4643f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4644f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4645f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4646f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46474992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 46484992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 46493068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4650180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 465174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 4652180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4653a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 465415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 465515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 465615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 465715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 465815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 465915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 466015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 466115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 466215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 466315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 466415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 466515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 466615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 466715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 466815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 466915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 467015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 467115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 467215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 467315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4674ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4675625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 467682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 467782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 467882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 467982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 468082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 468182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 468282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 468382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 468582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 468682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4696f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4697f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4698f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4699f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4700f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4701f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4704f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4705f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4706f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4707f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4708f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4709f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4710f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4711f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4712f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4713f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4714f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4715f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4716f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4717f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4718f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4719f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4720f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4721f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4722f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4723f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4724f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4725f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4726f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4727f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4728f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4729625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4730625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4731625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4732625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4733625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4734625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4735625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4736625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4737ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 47383068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 47393068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4740b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4741b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4742b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4743b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4744b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4745b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4746b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4747b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4748b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4749b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4750b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4751b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4752b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4753b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4754b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4755b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4756b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4757b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4758b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4759b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4760b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4761b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4762b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4763b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4764b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4765b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4766b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4767b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4768b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4769b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4770b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4771b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4772b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4773b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4774b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4775b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4776b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4777b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4778b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 477926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 478026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 478126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 478226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 478326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 478426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 478526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 478626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 478726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 478826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 47892ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 47902ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4793a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4794a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4795a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 47961aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue LHSVal; 4797745f5147e065900267c85a5568785a1991d4838fRichard Smith 4798745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4799745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4800f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4801d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4802745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 480330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4804745f5147e065900267c85a5568785a1991d4838fRichard Smith 48051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &RHSVal = Result; 480642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 480742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4808c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4809a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4810a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 48112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 481247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 481342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 481447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 481547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 481642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 481742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 481842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 481942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 48202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4821c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 482247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 482347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 482447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 482542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 482642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 482742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 482865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 482965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 483065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 483165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 483265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 483365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 483465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 483565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 483665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 483765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 483865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 483965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 484065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 48415930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 48425930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 48435930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 48445930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 48451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 484665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 484765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 484865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 484942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4850c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4851f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4852a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4853c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 485542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4856a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 485732fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4858f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 48597b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 48607b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48617b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 48627b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 48637b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 48647b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48657b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 48667b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 48677b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 48687b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 48697b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 48707b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4871c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4872c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4873c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 48742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 48753df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 487654176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4877f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 48783df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 48793df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4880789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4881789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4882789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 48833df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 48842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4885789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4886789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4887091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4888789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4889091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4890091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4891091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4892091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4893091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4894789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4895789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4896789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4897789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4898789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4899789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4900789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4901789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4902925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith // operand, and must not overflow the corresponding unsigned type. 4903789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4904789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4905925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith else if (LHS.countLeadingZeros() < SA) 4906925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith CCEDiag(E, diag::note_constexpr_lshift_discards); 4907789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4908789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 49103f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4912789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4913789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4914091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4915789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4916091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4917091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4918091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4919091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4920091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4921789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4922789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4923789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4924789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4925789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4926789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4927789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4928c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 49293f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4931c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4932c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4933c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4934c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4935c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4936c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4937b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4938a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4939a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 49408b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 49415d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 49425d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 49435d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 49445d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 49459f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 49469f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 49479f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 49489f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4949e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4950e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 49518b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4952af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4953af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4954af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 49551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4956af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 49578b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 49588b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4959a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4960af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 49618b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 49628b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4963af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4964e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4965e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4966e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4967e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4968f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4969f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4970f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4971f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4972f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4973f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4974e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 49754f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4976e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 49774f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4978e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4979a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4980f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4981f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 49820518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4983f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4984f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4985a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4986f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4987f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4988f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 4989f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 4990f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4991f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 4992f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 4993f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 4994f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4995f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4996f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 4997f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 4998f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 4999f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5000f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5001f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5002f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5003180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 500474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5005f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5006180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5007f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5008f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5009f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5010f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5011fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5012fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 50138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 50148ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 50158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 50168ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5017f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 50198ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 50208ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 50218ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 50228ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 50238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 50248ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 50258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 50268ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 50278ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 50288ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5029f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50308ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 50318ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 50328ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 50338ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50348ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5035f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50368ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 50378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 50388ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5039f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5040f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 50428ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5043ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5044cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5045fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 50468ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 50478ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50488ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5049f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50508ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 50518ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5052f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5053cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5054cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5055cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5056f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5057cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5058cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5059cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5060f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5061f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5062cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 5063cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5064cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5065cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5066cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5067cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5068cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5069f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5070cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5071cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 50727c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5073cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5074cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 50758ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 50768ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 50778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 50788ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 50798ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5080b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 508175a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 50824c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 508375a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 508475a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5085f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 50862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 50874c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 50884c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5089f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 50902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5091c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5092f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5093f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5095f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5096f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5097789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5098789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5099789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5100789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5101789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5102f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5103f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5104f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5105f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5106f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5107f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5108f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5109f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5110f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5111f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5112f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5113f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5114f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 511506a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5116a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 51171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5118732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5119732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 51208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 51218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 512282206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5123b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 512482206e267ce6cc709797127616f64672d255b310Anders Carlsson 512546a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 512646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 512746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 512846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 512946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 513046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 513146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 513246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 513346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 513446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 513546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 513646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 51374d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 513846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 513946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 514046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 514146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 514246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 514346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 51441d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 51451d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 514646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 514746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 514846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 514946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 515046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 515146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 515246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 515346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 515446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 515546a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 515646a523285928aa07bf14803178dc04616ac85994Eli Friedman 5157e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 515846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 515946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 516033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 516133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 516233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 516333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5164ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5165f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 516646a523285928aa07bf14803178dc04616ac85994Eli Friedman 51677d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 516846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 51697a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 51707a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 517146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5172c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 517346a523285928aa07bf14803178dc04616ac85994Eli Friedman 517446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 517546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 517646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 517746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 517846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 517946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 51804efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5181c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 51824efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5183131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 51844efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 51854efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 518646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5187732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5188b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5189a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5190be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 519165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 519265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 519365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 519465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 519565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 519665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 519765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5198be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5199be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5200be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 520130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5202f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5203f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5204732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 52051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 520646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5207c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5208c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5209efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 521087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5211b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 52124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5213dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5214dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5215f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5216f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5217f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5218dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5219f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5220dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5221b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5222efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5223dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5224dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 52254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5226a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5227a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5228f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 52292bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 52304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 523146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5232f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 52331725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 52341725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 523546a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 52361725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 52372217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 523846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 523946a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 524046a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 524146a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5242732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5243c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5244c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5245c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5246c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 524746a523285928aa07bf14803178dc04616ac85994Eli Friedman } 524846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 52491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 525046a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5251a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 52522bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5253722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5254722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5255f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5256f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5257f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5258f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5259f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5260722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5261722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5262722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5263722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5264722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5265722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5266664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5267722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5268f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5269f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5270f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5271f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5272f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5273722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5274722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5275722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 52768327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5277664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5278664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5279664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5280ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5281ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5282ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5283ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5284295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5285295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5286295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5287295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5288f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5289d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5290d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5291d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5292d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5293770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 52948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5295d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5296d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5297d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 52988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5299d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53001aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 53018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 53028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 53038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5304d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 530551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5306f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5307f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5308f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5309f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5310019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5311d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53125db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5313d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5314d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 53158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 53162217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5317abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5318abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5319ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 532051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5321d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5322d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5323d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5324d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5325c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 53268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5327d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5328d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53294ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5330db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5331db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5332db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5333db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5334db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5335db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5336db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5337db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5338db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5339db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5340db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5341db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5342db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5343db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5344db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5345db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5346db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5347db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5348db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5349db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5350db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5351db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5352db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5353db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5354019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5355180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 53568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 53578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 53588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5359019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5360019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5361019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5362019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5363019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 53647cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 53657cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 53667cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 536734a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 536834a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 53697cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 53701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5371db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5372db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5373db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5374f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5378db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 53799e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 53809e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 53819e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 53824572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 53839e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5384f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5385f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5386f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5387f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 53885db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 53895db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 53905db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 53915db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 53925db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 53935db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 53941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53955db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 53965db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 53975db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 53985db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 53991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 54001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 54015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 54025db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 54035db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 54045db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 54055db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54065db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 54075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54085db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5409019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5410019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5411019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5412abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 541343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 541443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 541543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 541643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 541743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 541843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 541943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 542043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 542143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5422abd3a857ace59100305790545d1baae5877b8945John McCall} 5423abd3a857ace59100305790545d1baae5877b8945John McCall 5424abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 542543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 542643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 542743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 542843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 542943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 543043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 543143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 543243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 54338327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 543443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 543543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5436abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5437abd3a857ace59100305790545d1baae5877b8945John McCall} 5438abd3a857ace59100305790545d1baae5877b8945John McCall 54395db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 54405db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5441f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 54437993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 54442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 54457993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 54467993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 54475db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54485db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54495db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 54505db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5451019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5452d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5453e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5454e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 545596e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 54565db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5457745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5458745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5459d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5460745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5461d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5462d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5463d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5466d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 54677b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5469d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 54707b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5472d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 54737b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 54742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5475d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 54767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5477d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 54787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 54797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 54807b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 54817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5482d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5483d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5484d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5485d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5486d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5487d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5488d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 54898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 54908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 54911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54922a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 54932a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5494c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 54952a523eec6a31955be876625819b89e8dc5def707Eli Friedman 54962a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 54974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 55014efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 55022a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55032a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 55044efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 55054efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5506c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5507c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 55084efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5509f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 55102a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5511f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5512f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5513f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5514f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5515f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5516f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 55172a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 55184efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 55194efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5520d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5521a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 55229ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 55239ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55249ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5525770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 55268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5527f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 55281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55299ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5530f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 55318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 55321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55331aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 55348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 55358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 55371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55387ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 55397ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 55428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55439ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 55458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5546b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 554796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 55487ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5549b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5550b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 55511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5552b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5553b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5554c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 55558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5556b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5557b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55587ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5559f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 55607ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 55617ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 55627ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 55637ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 55647ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 55657ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 55667ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 55677ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 55687ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 55697ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 55707ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 55717ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 55727ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 55737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 55758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5576b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5577b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5578b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5579b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5580b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5581b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5582b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5583b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5584b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5585b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5586b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5587b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5588b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5589b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5590b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5591b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5592b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5593b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5594b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5595b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5596b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5597b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5598b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5600b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 56028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 56038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 56048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 56058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 56068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 56078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 56088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 56098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 56108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 56118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 56128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 56138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 56148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 56154d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 56168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 56178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 56188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 56198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 56208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 56218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 56228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 56238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 56248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 56258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 56268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 56278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 56281d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 56291d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 56308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 56318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 56328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 56338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 56348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 56358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 563633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 563733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 563833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 563933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5640ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 56418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 56428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 56447a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 56457a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 56468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5647c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 56482bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 56498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 565046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 56518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5652f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 56538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5655b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 56568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5657b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5658b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 56608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 56618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 56628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 56658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 56668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 56678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5672c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5673c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 56748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 56778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 56788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 56798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5684c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5685c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5686c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5687c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 56888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5691b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 56928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5693b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 56949ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 56958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 56968786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 56978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 56988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 57018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5702b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5703ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 57048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57071725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5708f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5709f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 57108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 57148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5721c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5722c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5723c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5724c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 57258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5726ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 57271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 57299ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 57309ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5731f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 57332ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 57342ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5735745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5736745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5737f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 57381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5739f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5740745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5741f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5742a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 57433f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 57443f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5745ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5746f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5748a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5749a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5750a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5751a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5752a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5753a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5754a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5755a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5756a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 57573f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 57582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5759a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5760a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5761a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5762a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(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_Mul: 57703f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5771f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 57723f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 57733f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 57743f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 57753f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 57761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57773f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 57783f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 57793f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 57803f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 57813f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 57823f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 57833f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 57843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 57853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 57863f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 57873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 57883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 57893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 57903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5791f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 57921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 57933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 57943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 57951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 57963f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 57973f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 57983f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 57993f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 580096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 580196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 580296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 580396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 580496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 580596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 580696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 580796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 580896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 580996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 581096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 581196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 581296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 581396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 581496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 581596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 581696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 581796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 581896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 581996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 582096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 582196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 582296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 582396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 582496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 582596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 582696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 582796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 582896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 582996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5830f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5831f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5832f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 583396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 583496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 583596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 583696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 583796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 583896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 583996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 584096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 584196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 584296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 584396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5844ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5845ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5846f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5847ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5848ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 584996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 585096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 585196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 585296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 585396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 585496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 585596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5856f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 585796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 585896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 585996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 586096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 586196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 586296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 586396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 586496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 586596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 586696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 586796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 586896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 586996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 587096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 587196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 587296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 587396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 587496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 587596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 587696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 587796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 587896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 587996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 588096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 58817ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 58827ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 58837ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 58847ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 58857ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 58867ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58877ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 58887ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 58907ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 58917ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 58927ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 58947ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 58977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 58997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 59007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 59019ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5902aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5903aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5904aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5905aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5906aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5907aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5908aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5909aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5910aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5911aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 59121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { return true; } 5913aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5914aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5915aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5916aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5917aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5918aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5919aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5920aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5921aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5922aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5923aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5924aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5925aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5926aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5927aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5928aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5929aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5930aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5931aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 593251f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5933f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5934f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 59351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { 5936c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5937c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5938c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5939c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5940c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5941c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5942c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5943c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 59441e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 594559b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5946575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 59471e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 59486dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5949efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5950efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5951efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 59526dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59531e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5954efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5955efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5956efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 59576dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59581aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(F); 5959efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5960efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5961efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5962660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 59631e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 596469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 597051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5971180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 597283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5973180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5974cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5975180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 597651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5977180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 597883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5979180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5980180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5981180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5982aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5983c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 5984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 5985c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5986c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 5987c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5988aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 5989aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 5990c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 5991c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 5992c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5993f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 5994dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5995660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 5996f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5997660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 5998660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 5999660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6000660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 600183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 600283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 600383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 600483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 600583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 600683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 60077ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 600851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 600951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 601051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 601169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 601269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6013180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6014180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6015180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6016180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 601769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 601869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 601969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 60201aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return Evaluate(Result, Info, E); 602169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 602269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6023f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6024f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6025f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 602651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 602751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 602851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 60291aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!::Evaluate(Result, Info, E)) 6030f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6031f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6032f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6033f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 60341aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.setFrom(Info.Ctx, Result); 60351aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) 6036f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6037f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6038f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 60391aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith // Check this core constant expression is a constant expression. 604083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6041f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6042c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 604351f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 604456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 604556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6046c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6047c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 604851f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6049ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6050ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6051ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6052ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6053ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6054ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6055ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6056ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 60572d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 60582d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6059e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 6060e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 60611445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 60621445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6063f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6064f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 606556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 606656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 60674ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 60684ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6069c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 607051f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 60711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith HandleConversionToBool(Scratch.Val, Result); 6072cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6073cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 607480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 607580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 607680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 607780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 607880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6079c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 608080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 608180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6082c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6084c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6085c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6086a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6087a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 60884ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 60891b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 60901b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6091efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 609283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 609383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 609483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 609583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 609683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 60971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.moveInto(Result.Val); 609883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6099b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6100b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6101099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6102099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6103099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 61042d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 61052d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 61062d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 61072d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 61082d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 61092d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6110099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6111099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6112099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6113099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6114099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6115099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6116099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6117099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6118099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 611951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 612051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 612151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 612251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 612351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 612451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 612551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 612683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 612783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 612851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 612951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 613051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 613183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 613283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 613383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 613483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 613583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 613683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 613783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6138099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6139099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 614051f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 614151f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 61424ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 61434fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 614451f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 614545b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 614651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 61474ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 61481e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6149393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6150393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6151a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 61521c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 615351f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6154c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 615551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 61561c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 615751fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 61581c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 615951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6160d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6161e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6162e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6163e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6164e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6165e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6166e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6167d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6168d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6169d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6170d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6171d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6172d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6173d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6174d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6175d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6176d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6177d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6178d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6179d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6180d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6181d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6182d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6183d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6184d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 618551f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6186d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6187d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6188d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6189d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6190d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 61913c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 61923c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6193d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6194d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6195d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6196d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6197d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6198d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6199d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6200d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6201d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62023c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 62033c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 62043c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6205d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6206d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6207d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 620851f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6209d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6210d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6211d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6212d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6213d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6214d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6215d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6216d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 62172ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6218d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6219d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6220d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6221d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 622263c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6223d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6224d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6225d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6226d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6227d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6228d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6229d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6230d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6231d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6232d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6233d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6234d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6235d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6236d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6237d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6238d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6239d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6240d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6242e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6243d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 62459be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6246d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 62479fcce65e7e1307b5b8da9be13e4092d6bb94dc1dRichard Smith case Expr::UserDefinedLiteralClass: 6248d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6249d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6253d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6256d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 62574765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6258d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6259d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6260d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6261d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6262d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6263ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCNumericLiteralClass: 6264ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCArrayLiteralClass: 6265ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCDictionaryLiteralClass: 6266d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6267d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6268d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6269d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6272ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCSubscriptRefExprClass: 6273d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6274d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6275d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6276d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 62777cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6278be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6279c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 628061eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6281f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 628203e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 62834b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6284276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6285cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 628601d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6287cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6288cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6289ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6290d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6291d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6292d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6293d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 629491a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 629591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 629691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 629791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6298d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6299d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6300f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6301f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6302d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6303d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6304ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCBoolLiteralExprClass: 6305d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6306ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6307d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 63086ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 63094ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor case Expr::TypeTraitExprClass: 631021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6311552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 63122e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6313d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6314d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 63156cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 631605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 631705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 631805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6319d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6320180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6321d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6322d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6323d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6324359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith case Expr::DeclRefExprClass: { 6325d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6326d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6327359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith const ValueDecl *D = dyn_cast<ValueDecl>(cast<DeclRefExpr>(E)->getDecl()); 6328359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith if (Ctx.getLangOptions().CPlusPlus && 6329359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith D && IsConstNonVolatile(D->getType())) { 6330d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6331d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6332d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6333d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6334d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6335d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6336d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6337d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6338d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6339d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6340db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6341db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6342db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6343099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6344099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6345099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6346099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6347099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6348099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6349099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6350d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6351d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6352d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6353359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith } 6354d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6355d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6356d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 63572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 63582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 63592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 63602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 63612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 63622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 636305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 636405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 636505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6366d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 63672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 63682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 63692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 63702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 63712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 63722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 63732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6375d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6376d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6378d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6379d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6380d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 638151f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 638205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6383d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6384d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6385d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6386d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6388f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6389f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6390f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6391f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6392d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6393d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6394d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6395d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6396d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6397d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 63982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 63992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 64002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 64012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 64022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 64032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 64042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 64052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 64062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 64072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 64082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 64092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 64102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 641105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 641205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 641305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6414d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6415d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 64172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 64182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 64192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 64202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 64212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 64222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 64232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 64242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 64252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 64262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 64272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 64282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 64292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 64302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 64312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 64322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6433d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 64352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 64362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 643751f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6438d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 64393b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6440a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6441d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6442d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6443d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6444a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6445d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6446d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6447d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6448d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6449d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 64502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 6451d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6453d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6455d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6456d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6458d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6459d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6460d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6461d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6462d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6463d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 64652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 64662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6467d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6468d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6469d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6470d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 64732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6474a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6476d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6477d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6478d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6479d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6480d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6483d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6484d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6485d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6486d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6487d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6488d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 649032cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6491f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 64932116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 64942116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 64952116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 64962116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 64972116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 64982116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 64992116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 65002116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 65012116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 65022116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 65032116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 65042116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 65052116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 65062116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 65072116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 65082116b144cf07f2574d20517187eb8863645376ebRichard Smith } 65092116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6510eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6511eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 65127a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 65137a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6514eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6515eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6516eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6517d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6518eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6519eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6520eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6521d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 652256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 652356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 652456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 652556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 652656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 652756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 652856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 652956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6530a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 653156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 653256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6537d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6538d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6539d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6540d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 654180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 654280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6543d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6544d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6545d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 654663fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 654963fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6550d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6551d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6552d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6553d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6554d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6555d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6556d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6557d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6558d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6559d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6560d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6561a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6562d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6563d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6564d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6565d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6566d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6568d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6569d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6570d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6571d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6572d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 65733026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6574d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6575d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6576f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6577f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6578f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6579f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6580f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6581f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6583f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6584f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6585f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 65864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 65874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6588dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6589dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 65904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 65914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6592dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6593f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6594f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6595dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6597f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6598f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6599d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6600d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6601d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6602d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6603d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6604f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6605f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6606f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6607f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6608f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6613f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6617d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 66184c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 661970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 662070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 662170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 662270488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 66234c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 66244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 66254c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 66264c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 66274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 66284c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 662970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 66304c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 66314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 66324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 66334c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 66344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 66364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 66374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 66394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 66404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 66414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 66424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 66434c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 66444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 66454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 66474c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6648745f5147e065900267c85a5568785a1991d4838fRichard Smith 6649745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6650745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6651745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6652745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6653745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6654745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6655745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6656745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6657745f5147e065900267c85a5568785a1991d4838fRichard Smith 6658745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6659745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6660745f5147e065900267c85a5568785a1991d4838fRichard Smith 6661745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6662745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6663745f5147e065900267c85a5568785a1991d4838fRichard Smith 6664745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6665745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6666745f5147e065900267c85a5568785a1991d4838fRichard Smith 6667745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6668745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6669745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6670745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 667183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6672745f5147e065900267c85a5568785a1991d4838fRichard Smith 6673745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6674745f5147e065900267c85a5568785a1991d4838fRichard Smith 6675745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6676745f5147e065900267c85a5568785a1991d4838fRichard Smith 66771aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 66781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 6679745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 66801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 6681745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6682745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6683745f5147e065900267c85a5568785a1991d4838fRichard Smith 6684745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6685745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6686