ExprConstant.cpp revision 83587db1bda97f45d2b5a4189e584e2a18be511a
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" 474572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith#include <functional> 494572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 50c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 51f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 52d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 53c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 5483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool IsGlobalLValue(APValue::LValueBase B); 5583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 56c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 57180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 58d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 59bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 60d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 6183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static QualType getType(APValue::LValueBase B) { 621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 68180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 69f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field or base class. 7083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static 71f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith APValue::BaseOrMemberType getAsBaseOrMember(APValue::LValuePathEntry E) { 72180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 73180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 74f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return Value; 75f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 76f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 77f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 78f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field declaration. 7983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const FieldDecl *getAsField(APValue::LValuePathEntry E) { 80f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<FieldDecl>(getAsBaseOrMember(E).getPointer()); 81180f47959a066795cc0f409433023af448bb0328Richard Smith } 82180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 83180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 8483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 85f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<CXXRecordDecl>(getAsBaseOrMember(E).getPointer()); 86180f47959a066795cc0f409433023af448bb0328Richard Smith } 87180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 88180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 8983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static bool isVirtualBaseClass(APValue::LValuePathEntry E) { 90f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return getAsBaseOrMember(E).getInt(); 91180f47959a066795cc0f409433023af448bb0328Richard Smith } 92180f47959a066795cc0f409433023af448bb0328Richard Smith 93b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 94b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 95b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 96b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 97b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 98b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 99b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 100b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 1019a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 102b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 103b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 104b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 105b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 108b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 109b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 110b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 111b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 112b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1139a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1169a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1189a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1199a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 121b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 122b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex, 123b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_This 124b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1260a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1270a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1290a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1300a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 133b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 134b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 135b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 136b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 137b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 138b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1430a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1460a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1479a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1489a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1500a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1530a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 154b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 155b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 156b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 157b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 158b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 159b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 160b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1619a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1639a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1649a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1659a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 166b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 168b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 169b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1719a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1729a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 177b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 178b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 179b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 180b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 181b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 182b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 183b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 185b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2000a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 205b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 207b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 213180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 214180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 217b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 218b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 219b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 220b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2250a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2270a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2299a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 230b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 231b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 232b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 233b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 236b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 237b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 238b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 239b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 240b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 241b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 242b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 243b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 244b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2450a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 246b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 25047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 25147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 25647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 25747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 25847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 2590a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 26247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 263177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 264177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 26547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 26647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 26747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 26847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 26947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 27047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 27183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(const CCValue &V) : APValue(V), Designator(V.Designator) {} 27283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(LValueBase B, const CharUnits &O, unsigned I, 2730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 27483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(B, O, APValue::NoLValuePath(), I), Designator(D) {} 275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 27683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(V), Designator(Ctx, V) { 27783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 278e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 279e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 28165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 28265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 28347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 2840a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 2850a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 2860a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 2870a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2880a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 2890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 2900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 29183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue toAPValue() const { 29283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!isLValue()) 29383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return *this; 29483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 29583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Designator.Invalid) { 29683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // This is not a core constant expression. An appropriate diagnostic 29783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // will have already been produced. 29883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 29983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue::NoLValuePath(), getLValueCallIndex()); 30083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 30183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 30283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 30383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Designator.Entries, Designator.IsOnePastTheEnd, 30483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith getLValueCallIndex()); 30583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 30647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 30747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 308bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 309bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 310bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 311bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 312bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 313bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 314bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 31508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 31608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 31708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 31808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 31908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 32008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 32183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// Index - The call index of this call. 32283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned Index; 32383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 324180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 325180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 326180f47959a066795cc0f409433023af448bb0328Richard Smith 327bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 328bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 329bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 330bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 331bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 332bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 333bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 334bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 335bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 33608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 33708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 338180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 339bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 340bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 341bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 342dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 343dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 344dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 345dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 346dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 347dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 348dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 349dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 350dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 351dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 352dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 353dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 354dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 355dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 356789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 357789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 358789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 359789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 360789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 361789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 362789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 363789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 364789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 365789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 366789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 367789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 368789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 369789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 370789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 371789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 372789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 373789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 374dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 375dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 37683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 37783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 37883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 37983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 38083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 38183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 38283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 38383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 38483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 38583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 38683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 38783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 38883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 38983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 390c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 391dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 3921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3931e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3941e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 395f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 396d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 397bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 398d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 399d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 400d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 401d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 40283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 40383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 40483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 40547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 406bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 407bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 408c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 409bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 410bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 411745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 412bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 413bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 414180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 415180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 416180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 417180f47959a066795cc0f409433023af448bb0328Richard Smith 418180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 419180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 420180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 421180f47959a066795cc0f409433023af448bb0328Richard Smith 422c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 423c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 424c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 425c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 426745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 427745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 428745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 429745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 430745f5147e065900267c85a5568785a1991d4838fRichard Smith 431bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 432bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 433dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 43483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 43583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 436745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 437745f5147e065900267c85a5568785a1991d4838fRichard Smith CheckingPotentialConstantExpression(false) {} 438bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 43947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 440c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 441c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 442c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 443c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 44456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 445180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 446180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 447180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 448180f47959a066795cc0f409433023af448bb0328Richard Smith } 449180f47959a066795cc0f409433023af448bb0328Richard Smith 450c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 451c18c42345636e2866fed75c7e434fb659d747672Richard Smith 452c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 453745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 454745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 455745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 456745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 45783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 45883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 45983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 46083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 46183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 462c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 463c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 464c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 465c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 466c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 467c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 468f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 46983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 47083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 47183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 47283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 47383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 47483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 47583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 47683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 47783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 47883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 480c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 482c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 483c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 484c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 485c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 486c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 48708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 48808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 48908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 490c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 491f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 495f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 498dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 49908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 50008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 50108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 50208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 503745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 504745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 50508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 506c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 507dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 50808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 50908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 510745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 511745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 51208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 513dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 514c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 515dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 516dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 517dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 518dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 519dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 5207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 5217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 522c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 523dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 524dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) 525dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 526c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 527c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 528c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 529c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 530c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 531c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 532c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 533c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 534f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 535099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 536099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 537099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 538099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 539099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 540099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 541099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 542099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 543745f5147e065900267c85a5568785a1991d4838fRichard Smith 544745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 545745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 546745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 547745f5147e065900267c85a5568785a1991d4838fRichard Smith return CheckingPotentialConstantExpression && EvalStatus.Diag->empty(); 548745f5147e065900267c85a5568785a1991d4838fRichard Smith } 549c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 550f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 551f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 552f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 553f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 554f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 555f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 556f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 557f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 558f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 559f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 560f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 561f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 562f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 563f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 564f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 565f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 56608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 56708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 568b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 573b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 577b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 578b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 579b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 580b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 581b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 582b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 583b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 584b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 585b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 586b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 587b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 588b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 589b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 590b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 591b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 592b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 59308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 59608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 59783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 59808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 60908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 61008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6125ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6135ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 61408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 61608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 61908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6205fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 62883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Convert the CCValue to an APValue without checking for constantness. 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 63183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueDesignator().IsOnePastTheEnd, 63283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueCallIndex()); 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 638bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 639d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 64908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 65008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 65108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 65408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 65508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 65608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 65708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 65808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 65908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 66008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 66108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 66208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 66308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 66408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 66508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 66608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 66708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 66808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 66908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 670bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 67108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 672d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 67308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 674f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 675f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 676f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 677f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 678f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 679f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 680f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 681f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 682f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 683f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 684f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 685f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 686f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 687f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 688f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 689f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 690f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 691f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 692f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 693f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 69447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 695f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 69647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 697f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 69847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 699f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 70047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 70156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 70256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 70356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 70456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 70556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 70656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 70756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 70856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 70956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 71056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 71156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 712f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 713efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 714efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 7151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 716efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 71783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 7180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 719efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 72147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 722625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 72383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7240a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7250a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 726efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 72747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 72883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith V = CCValue(Base, Offset, CallIndex, Designator); 729efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 73047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 73147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 73247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 73347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 73483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 7360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 73883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 74183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 747b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 748b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 749b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 750b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 752b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 753b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 754b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 755b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 756b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 757b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 758b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 761b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 762b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 764b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 765b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 766b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 767b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 768b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 769b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 770b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 771b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 772b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 773b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 774b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 775b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 776b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 777b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 778b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 779b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 78056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 781efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 871c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 872b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 873b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 874b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 875b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 876b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 877b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 878b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 879b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 880b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 881c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 882c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 883c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 884c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 885c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 886c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 887f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 88887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 88947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 89083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 89183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 89283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 89383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 894efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 895efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 89987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 90047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 901d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 902d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 903f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 904f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 905f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 9064efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 9074efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 9084efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 909180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 910180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 911180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 912180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 913180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 914180f47959a066795cc0f409433023af448bb0328Richard Smith} 915180f47959a066795cc0f409433023af448bb0328Richard Smith 9161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 917180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 918180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 919180f47959a066795cc0f409433023af448bb0328Richard Smith 920180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 921180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 92342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 925180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 92742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9281bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 93042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9321bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9341bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 936180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CompoundLiteralExprClass: 937180f47959a066795cc0f409433023af448bb0328Richard Smith return cast<CompoundLiteralExpr>(E)->isFileScope(); 938180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 939180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 940180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 941180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 942180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 94347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 944180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 945180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 946180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 947180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 948180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 949180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 950180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 951180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 952180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 953180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 954745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 955745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 956745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 957745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 958745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 959745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 960745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 961745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 962180f47959a066795cc0f409433023af448bb0328Richard Smith } 96342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 96442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 96583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 96783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 96883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 96983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 97083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 97183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 97283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 97383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 97483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 976b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 97761e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 97861e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 97983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 98083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 98183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 98283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 983c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 985c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 986c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 987c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 988c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 98983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 99083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 99183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 99283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 993c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 99483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 995c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 99661e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 99769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 998f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 99983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 100083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 100183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 1002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1003b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1007b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 101183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 101261e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1013b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1014b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1015c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1016b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1017c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 101883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1019c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 102083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1021c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1022c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 102369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 102447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 102547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 102651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 102751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 102851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 102951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 103051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 103151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 103251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 103351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 103451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 103551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 103651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 103751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 103851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 103951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 104051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10419a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 104283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 104383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 107483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 107883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 108283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 108683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Val(Info.Ctx, Value, CCValue::GlobalValue()); 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 108883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.setFrom(Val); 108983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10909a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 109183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 109283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 109383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10949a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10959a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10969e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10989e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10999e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 11009e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 110183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 11029e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11039e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 110465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 110565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11060dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 110765ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 110865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1109e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 11103554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11113554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11143554283157190e67918fad4221a5e6faf9317362John McCall return true; 11153554283157190e67918fad4221a5e6faf9317362John McCall } 11163554283157190e67918fad4221a5e6faf9317362John McCall 1117e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1118e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11193554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1120e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11210dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11225bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11235bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 112447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 1125c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1126c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1127c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1128c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1129c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 113041bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1131c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1133a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1136c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1138c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1140c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1141436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1142e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1143e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1144e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1145e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1148cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1149180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1150180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 115165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1152c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1155c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1156c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1157c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1158c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1159c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1160c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 116147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1162c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1163c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1164c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 11654efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11664efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1167c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1168c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1169c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1171789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1172c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1173c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1174c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1175c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1176c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1177c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1179a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1180575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1182c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1183a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1184c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1185c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1187c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1188a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1189a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1190c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1191c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1193c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1194a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1195c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1196c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1197c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1198c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1199c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1200a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1201a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1202f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1203f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1204f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1205f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1206a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1207a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1208a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12099f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1210575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1211a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1212a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1213a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1214c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1216c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1218c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1220c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1221c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1223a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1224a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1225e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1226e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1228e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1229e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1261e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1263e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1265e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1266e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1267e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1268e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1269e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1270e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1271e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1272b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1273b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1278180f47959a066795cc0f409433023af448bb0328Richard Smith 1279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1280b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1281b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1282b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1283b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1284b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1285180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1286180f47959a066795cc0f409433023af448bb0328Richard Smith 1287b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1290180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1291180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1293180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1295180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1296180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1297180f47959a066795cc0f409433023af448bb0328Richard Smith } 1298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1299180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1300180f47959a066795cc0f409433023af448bb0328Richard Smith} 1301180f47959a066795cc0f409433023af448bb0328Richard Smith 1302b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1303180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1304180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1305180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1306180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1307180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1308b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1309180f47959a066795cc0f409433023af448bb0328Richard Smith} 1310180f47959a066795cc0f409433023af448bb0328Richard Smith 1311b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1312180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1313180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1314180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1315180f47959a066795cc0f409433023af448bb0328Richard Smith 1316180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1317b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1318180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1319180f47959a066795cc0f409433023af448bb0328Richard Smith } 1320180f47959a066795cc0f409433023af448bb0328Richard Smith 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1322b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1323b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1325180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1326b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1328180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1329180f47959a066795cc0f409433023af448bb0328Richard Smith 1330b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1331180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1332180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1333b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1334180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1335180f47959a066795cc0f409433023af448bb0328Richard Smith} 1336180f47959a066795cc0f409433023af448bb0328Richard Smith 1337180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1338180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1339b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1340180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1341180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1342180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1343180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1344180f47959a066795cc0f409433023af448bb0328Richard Smith 1345180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1346180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1347b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1348180f47959a066795cc0f409433023af448bb0328Richard Smith} 1349180f47959a066795cc0f409433023af448bb0328Richard Smith 1350d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1351d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1352d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1353d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1354d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1355d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1356d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1357d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1358d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1359180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 1360180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool HandleSizeof(EvalInfo &Info, QualType Type, CharUnits &Size) { 1361180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1362180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1363180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1364180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1365180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1366180f47959a066795cc0f409433023af448bb0328Richard Smith } 1367180f47959a066795cc0f409433023af448bb0328Richard Smith 1368180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1369180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 1370b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: Diagnostic. 1371180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1372180f47959a066795cc0f409433023af448bb0328Richard Smith } 1373180f47959a066795cc0f409433023af448bb0328Richard Smith 1374180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1375180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1376180f47959a066795cc0f409433023af448bb0328Richard Smith} 1377180f47959a066795cc0f409433023af448bb0328Richard Smith 1378180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1379180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1380b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1381180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1382180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1383180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1384b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1385b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1386b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1387180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 1388180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, EltTy, SizeOfPointee)) 1389180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1390180f47959a066795cc0f409433023af448bb0328Richard Smith 1391180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1392180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1393b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1394180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1395180f47959a066795cc0f409433023af448bb0328Richard Smith} 1396180f47959a066795cc0f409433023af448bb0328Richard Smith 139703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1398f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1399f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1400177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1401d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1402d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1403d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1404745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1405745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1406745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1407745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1408f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1409dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1410177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1411f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1412177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1413177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1414d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 141503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1416099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1417099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1418099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1419745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1420745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1421745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1422745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1423099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1424099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1425099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1426180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1427180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1428180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1429b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1430b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1431180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1432180f47959a066795cc0f409433023af448bb0328Richard Smith } 1433180f47959a066795cc0f409433023af448bb0328Richard Smith 143465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 143565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1436f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1437dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 143865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 144065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1441099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1442099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1443099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1444099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1445099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1446099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1447099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1448099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 144947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1450099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1451099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1452099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1453099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1454099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1455f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 145603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1457b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 145847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 145903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 146003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1461c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 146203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 146303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 146403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 146503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 146659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 146759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 146859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 146959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 147059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 147159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 147259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 147359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 147459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 147559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 147659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 147759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 147859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 147959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 148059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1481cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1482f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1483f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1484cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1485b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1486b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1487cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1488b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 14897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1490aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1491aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 14927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 14937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1494f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1495cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1496745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1497745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1498745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1499cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1500cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(!Obj.isLValue() && "extracting subobject of lvalue"); 1501cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1502180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1503cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1504cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1505180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1506cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1507f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1508cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1509f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1513aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1514aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1515cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1516f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1517cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (O->getArrayInitializedElts() > Index) 1518cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1519cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1520cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1521cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 1522180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1523b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 1524b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_mutable, 1) 1525b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1526b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1527b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1528b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1529b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1530180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1531180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1532180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1533180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1534180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1535f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 15367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 15377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 15387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1539180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1540f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1541180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1542180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1543180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1544180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 15457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 15467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 15477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 15487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 15497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 15507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 15517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 15527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 15537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 15547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 15557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1557cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1558180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 155959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 156059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 156159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 156259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1563cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1564180f47959a066795cc0f409433023af448bb0328Richard Smith 1565f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1566745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1567745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1568180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1569f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1570cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1571cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1573cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1574cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1575cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1576f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1577f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1578f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1579f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1580f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1581f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1582f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1583f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 1584f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!ObjType.isNull() && ObjType->isArrayType()) { 1585f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1586f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1587f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1588f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1589f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1590f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1591f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1592f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1593f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1594f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1595f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1596f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1597f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1598f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1599f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1600f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1601f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1602f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1603f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1604f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1605f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1606f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1607f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1608f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1609f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1610f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1611f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1612f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1613f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1614f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1615f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1616f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1617f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1618f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1619f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1620f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1621f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1622f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1623f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1624f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1625f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1626f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1627f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1628f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1629180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1630180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1631180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1632180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1633180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1634f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1635f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 16369ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 16379ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1638180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1639180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1641f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1642cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 16437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 16447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 16457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 16467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1647b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1648b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1649b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1650b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 16511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 16527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1653c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1654f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1655f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 16567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 16577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 166083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 166183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 166283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 166383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 166483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 166583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 166683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 166783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 166883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 166983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 16707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 16717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 16727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 16737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 16747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 16757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 16767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 16777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 16787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1679c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1680f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1681c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 16821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1683c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1684c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1685d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1686d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1687c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1688c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const VarDecl *VDef = VD->getDefinition()) 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1691f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 16927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 16930a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1694f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1695f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 16967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 16977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 16981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 16997098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1705f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17167098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 17237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 17247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 17257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 17267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 17317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 17347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17400a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1741f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 17437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1744f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1745c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1746c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 174747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1748f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1750c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1751c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1752c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1753c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1754c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 17550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 17560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 17571bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 175883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 175983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 176083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 176183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 176283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 176383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 176483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 176583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 176683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 176783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 176883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1769c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1770c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 17727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 17737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 17757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 17767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17820a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 17830a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (const StringLiteral *S = dyn_cast<StringLiteral>(Base)) { 17840a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &Designator = LVal.Designator; 1785f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Designator.Invalid || Designator.Entries.size() != 1) { 1786dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 17870a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1788f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 17900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(Type->isIntegerType() && "string element not integer type"); 17919a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith uint64_t Index = Designator.Entries[0].ArrayIndex; 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith const ConstantArrayType *CAT = 17937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Ctx.getAsConstantArrayType(S->getType()); 17947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Index >= CAT->getSize().getZExtValue()) { 17957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer which points more 17967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // than one past the end of the array without producing a prior const expr 17977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // diagnostic. 17987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_read_past_end); 17990a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1800f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 18020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Type->isUnsignedIntegerType()); 18030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Index < S->getLength()) 18040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Value = S->getCodeUnit(Index); 18050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith RVal = CCValue(Value); 18060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 18070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1809177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1810cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1811cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1812177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1813cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1814cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1815cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1816cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1817cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1818c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1819cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1820cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1821f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1822dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1823cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1824f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1825c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1826f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1827f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1828c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1829c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 183059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 183159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 183259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 183359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 183459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 183559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 183659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 183759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 183859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1862745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1863745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1875745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1876745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1877745f5147e065900267c85a5568785a1991d4838fRichard Smith 1878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1882b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1896b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1897b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1898b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1913b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1917b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1919e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1922d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1923d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1924d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1925d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1926d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1927d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1928d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1939b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1945b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1946b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1947b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 1948b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1949b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1950b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1951b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1952b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1953b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1954b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1955b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 1958b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 1959b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 1960b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 1962b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 1963b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 1964b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1966b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1969b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 197059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 197159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1972c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 1973d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 1974d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 1975d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 1976d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 1977d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 1978d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 1979d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 1980d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 1981d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 1982d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1983d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 198483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic EvalStmtResult EvaluateStmt(CCValue &Result, EvalInfo &Info, 1985d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 1986d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 1987d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 1988d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 1989d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1990d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 1991d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 1992d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 1993d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 1994c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 1995c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 199683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 1997c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 1998c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 1999c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2000d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2001d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2002d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2003d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2004d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2005d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2006d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2007d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2008d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2009d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2010d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2011d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2012d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2013d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20146180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20156180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20166180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20176180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20186180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 201951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 202051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20216180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20226180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20254c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20264c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 20286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 20294c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20304c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20334c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20346180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20356180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 20366180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20376180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20386180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 20396180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 20406180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2041c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2042c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2043c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2044c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2045c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2046745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2047745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2048745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2049745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2050745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2051745f5147e065900267c85a5568785a1991d4838fRichard Smith 2052c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2053c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2054c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2055c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2056c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2057c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2058099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2059099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2060c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2061c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2063c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2064c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2065c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2066c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2067c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2068c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2069c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2070180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 2071cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 2072180f47959a066795cc0f409433023af448bb0328Richard Smith} 2073180f47959a066795cc0f409433023af448bb0328Richard Smith 2074180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2075180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2076180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2077745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2078180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2079745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2080745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2081745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2082745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2083745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2084745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2085745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2086745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2087745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2088745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2089180f47959a066795cc0f409433023af448bb0328Richard Smith} 2090180f47959a066795cc0f409433023af448bb0328Richard Smith 2091d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2092745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2093745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 209583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EvalInfo &Info, CCValue &Result) { 2096180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2097180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2098180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2099d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2100745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2101745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2102745f5147e065900267c85a5568785a1991d4838fRichard Smith 2103745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2104d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2105d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2106d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2107180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2108745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 210959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2110180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 211151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2112180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2113180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2114180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2115180f47959a066795cc0f409433023af448bb0328Richard Smith 2116745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2117745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2118745f5147e065900267c85a5568785a1991d4838fRichard Smith 211986c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 212086c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 212186c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 212286c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 212386c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 212486c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2125745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2126180f47959a066795cc0f409433023af448bb0328Richard Smith 2127180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2128180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2129180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 213083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2131180f47959a066795cc0f409433023af448bb0328Richard Smith } 2132180f47959a066795cc0f409433023af448bb0328Richard Smith 2133610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2134610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2135610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2136610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2137610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 2138610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 2139610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 2140610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 2141610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 2142745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 2143745f5147e065900267c85a5568785a1991d4838fRichard Smith RHS, Value)) 2144745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2145745f5147e065900267c85a5568785a1991d4838fRichard Smith assert((Value.isStruct() || Value.isUnion()) && 2146745f5147e065900267c85a5568785a1991d4838fRichard Smith "trivial copy/move from non-class type?"); 2147745f5147e065900267c85a5568785a1991d4838fRichard Smith // Any CCValue of class type must already be a constant expression. 2148745f5147e065900267c85a5568785a1991d4838fRichard Smith Result = Value; 2149745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 2150610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2151610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2152610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 215351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2154180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2155180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2156180f47959a066795cc0f409433023af448bb0328Richard Smith 2157180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2158180f47959a066795cc0f409433023af448bb0328Richard Smith 2159745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2160180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2161180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2162180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2163180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2164180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2165180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2166745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2167745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2168745f5147e065900267c85a5568785a1991d4838fRichard Smith 2169745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2170180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2171180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2172180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2173180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 217486c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2175180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2176180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2177180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2178180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2179180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2180b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2181180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2182745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2183180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2185180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2186180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2187745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2188745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2189745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2190745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2191d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2192d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2193d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2194d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2195d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2196d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2197d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2198d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2199d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2200d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2201d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2202d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2203d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2204d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2205d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2206d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2207d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2208d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2209d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2210d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2211d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2212745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2213d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2214d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2215d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2216d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2217d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2218180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2219d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2220180f47959a066795cc0f409433023af448bb0328Richard Smith } 2221745f5147e065900267c85a5568785a1991d4838fRichard Smith 222283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 222383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2224745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2225745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2226745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2227745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2228745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2229745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2230745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2231180f47959a066795cc0f409433023af448bb0328Richard Smith } 2232180f47959a066795cc0f409433023af448bb0328Richard Smith 2233745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2234180f47959a066795cc0f409433023af448bb0328Richard Smith} 2235180f47959a066795cc0f409433023af448bb0328Richard Smith 2236d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2237770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 22388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 22391e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2240c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2241c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22421e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2243c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2244c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 22458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2246c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2247c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2248c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 22508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2251f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2252f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 22538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 22541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2255c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2256c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2257c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2258f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 22591e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2260f85e193739c953358c865005855253af4f68a497John McCall return true; 2261f85e193739c953358c865005855253af4f68a497John McCall return false; 2262f85e193739c953358c865005855253af4f68a497John McCall } 2263f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 22641e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2265f85e193739c953358c865005855253af4f68a497John McCall return true; 2266f85e193739c953358c865005855253af4f68a497John McCall return false; 2267f85e193739c953358c865005855253af4f68a497John McCall } 2268f85e193739c953358c865005855253af4f68a497John McCall 2269c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2270c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 22718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 22728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 22738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2274c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 22758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 22768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 22778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 22788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 22798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 22808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2281f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 22828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2283980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 22848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 22851e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 22868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 22878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 22888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 22898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2290980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 22918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 22928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 22938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 22948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 22958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 22961e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2297c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2298980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2299c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2301363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2302363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2304363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2305363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23074423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2308363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2309363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2310ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 23118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2312c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2313c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 231456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 231556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 231656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 231756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 231856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 231956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 232056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 232156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 232256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 232356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 23241e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 232556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 232656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 232756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 232856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 232956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 233056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 233156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 233256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 23331e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // FIXME: This will not work for recursive constexpr functions using opaque 23341e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith // values. Restore the former value. 233556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 233656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 233756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 233856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2339c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2340c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 23428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 23438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 23448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 23458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2346f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2347f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 23488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 23498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 23508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 235147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 23528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23538cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 235451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 235551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2356f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 23598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 23608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 23618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 23628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2363dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2364d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2365f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2366f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2367f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2368f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2369f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2370dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2371f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2372f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2374f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 237751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2378f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2383b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2386f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 23878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 23908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 23928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 23948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 23968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 23978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 23988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 239991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 240091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 24013d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 24023d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2403bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2404bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2405bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2406bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 24078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2408c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2409c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2410c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2411c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2412c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2413c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2414c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2415c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2416c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2417e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2418e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2419e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2420f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2421e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2422e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2423e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2424e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2425e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2426e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2427e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2428e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2429e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2430e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2431e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2433e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2434e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2435e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2436e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2437e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2438e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 24398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 24408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 24418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2442f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 24438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool cond; 2445c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), cond, Info)) 2446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 24478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return StmtVisitorTy::Visit(cond ? E->getTrueExpr() : E->getFalseExpr()); 24498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2452f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2453f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2454f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2455f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2456f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2457f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2458f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2459f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2460f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2461f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2462f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2463f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2464f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2465f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2466f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2467f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2468f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 24698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool BoolResult; 2470c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) 2471f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 24728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2473c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 2474f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!StmtVisitorTy::Visit(EvalExpr)) 2475f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2476f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2477f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2478f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2479f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2480f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 24818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 248447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 248542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 248642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 248742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2488f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 248942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 249042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2491f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 249242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 249342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 249442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 249547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 24968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2497f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2498d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2500d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2501d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 25026142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 250359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 250459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 250586c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 250659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 250759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 250859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2509f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2510e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2512e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 251686c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2517e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2518e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2519f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2520f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2521e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2523f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2524f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2525f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2526f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 252859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2529b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2530b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2531f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 253259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2533b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2534f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 25361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 253759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 253959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 254059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 254159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 254259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 254359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2544f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2545f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2546f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2549f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 255059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 255159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 255259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 255359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 255459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2555d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 255659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 255759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2558f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 255959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2560f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2561d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2562b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2563b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2564b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 256586c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 256686c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 256786c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 256886c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 256986c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 257086c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2571c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2572d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 257383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Result; 2574d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2575c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2576745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2577745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2578f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2579d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 258083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2581d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2582d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2583c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2584c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2585c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2586f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 258771523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 258871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 258971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 259071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2591f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2592f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2593f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 259451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2595f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2596f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 259751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2598f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 260051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2602f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2603180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2604180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2605180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2606180f47959a066795cc0f409433023af448bb0328Richard Smith 2607180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2608180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2609180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2610180f47959a066795cc0f409433023af448bb0328Richard Smith 2611180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2612180f47959a066795cc0f409433023af448bb0328Richard Smith 2613180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2615180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2616180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2617180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2618180f47959a066795cc0f409433023af448bb0328Richard Smith 2619b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2620b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2621180f47959a066795cc0f409433023af448bb0328Richard Smith 2622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2623180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2624180f47959a066795cc0f409433023af448bb0328Richard Smith } 2625180f47959a066795cc0f409433023af448bb0328Richard Smith 2626c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2627c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2628c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2629c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2630c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26317a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26327a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2633c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26347d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2635c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2636c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2637c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2638c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2639f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2641f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 26429ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 26439ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 26449ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2645f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2647c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2648c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2649c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2650f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2651c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2652c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26538327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 26548327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 265547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 26568327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 26578327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 26588327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 26598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 26608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 26628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2675e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2676e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2677e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2678e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2679e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2680e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2681e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2687e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2688e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2689e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2690e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2691e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2692e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2693e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2696c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2697af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2698c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2699c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2700c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2701e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2702e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2703e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2705e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2706e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2707d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2708d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2709d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2710d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2711d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2712d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2713d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2714d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2715d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2716d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2718d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 2719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2720d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2755b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2760e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2761e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2762e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2763e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 27694efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2770c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2771c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2772c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2773c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2774c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2775c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2776c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 27771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 27781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 27791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 27801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2781c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2782c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 278347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2784c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2785180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2786c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2787c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2788c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2789c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 27901bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 279183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 279283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 27931bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 27944efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 27954efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2796770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 27984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 28011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2802c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2803c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 28048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 28058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2806bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 28078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 28088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 28098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 28108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 281147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 28128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 28138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 28148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 281626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 281726bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 281926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2820db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2821c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28240a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28250a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2826db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2828180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2829180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 283126bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 283226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 2833cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 2834ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: __real__, __imag__ 28358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 28374efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 28384efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2840c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2841c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2842c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2843c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2844efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2845c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2846c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2847c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 28488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 28494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28504efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 28518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 28521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 28531bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 28541bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2855c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2857c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2858436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2859c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2860177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2861177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 286283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2863177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2864177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 28651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2866177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 286750c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 286847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2869f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2870f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2871f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 287235873c49adad211ff466e34342a52665742794f5Anders Carlsson} 287335873c49adad211ff466e34342a52665742794f5Anders Carlsson 2874bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2875bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2877af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 288083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 288183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 288283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2890f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 289383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2895bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2896bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 28978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 28988cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2899c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2900c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2901c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2902efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 29034efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29044efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 290547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 290647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 290747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 290847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 290947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 291047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 291147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 291247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 291347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 291447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 291547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 291647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 291747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 29188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2921c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2922c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2923c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2924c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2925d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2926d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2927d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2928d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2930d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2931d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2932d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2933180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 29354efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2938c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2939c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2940f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2941c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29423068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2943efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 29441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29453068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 29463068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2947efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2948180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2949180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2950180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 29513068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2952b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 29533068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 29544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2956efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2957e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2958e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 29594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2960f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2961f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2962f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2963c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2964770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 29658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2966efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2967efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 29688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 29691bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2970efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2971efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 29722bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 29731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2974efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 29758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2976f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 297747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 29788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 29798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 29802bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 298151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2982f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2983f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 29842bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2985efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 29868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2987efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 29888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 2989efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 29908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 2991efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 29928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 29938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 2994469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 2995efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 2996f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2997b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 2998180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 2999180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3000f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3001180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3002180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3003180f47959a066795cc0f409433023af448bb0328Richard Smith } 300456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3005ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30062bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3007f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30082bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3009efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3010c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3012f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3013650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3014efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 30152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 30162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3017e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 30181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3019650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3020650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3021650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3022f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 30231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3024745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3025745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3026efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3028efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3029745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3030efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3031efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3032efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3033efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 30340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 30350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3036650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3037180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3038b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3039b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3040650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 30414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3042efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3043efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 30444efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 30478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3048650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 304909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 305009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 305109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 305209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 30541d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 30551d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 30562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 305728c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 305828c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3059c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3060c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3061c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 30624cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 306328c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 30644cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 30654cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 30664cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 30674cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 30684cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 30694cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 30700a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 307109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30725c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 30735c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 307447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 30755c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3076e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3077e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 30785c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3079180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 30805c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3081180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3082180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 30835c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3084180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 30855c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3086b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3087b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 30885c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3089180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 30905c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 30915c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 30925c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 30935c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 30945c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3095e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3096e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3097e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3098e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3099e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3100e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3101e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 310247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 310351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3104404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3106c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3107c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 310847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 3109efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 311009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 311169ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3112efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 311347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 311447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 31151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 311647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 311783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 31180a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3119efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3120efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3121efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 312247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 3123efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3124650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3125650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 31262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3127e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3128e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3129e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3130e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 313183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 313283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 313383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3134e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3135e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 31360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3137b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3138b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 31420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 31436a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 31442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 31456a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 31464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 31474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 31491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3150650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 31518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3152180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3153efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 315456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 31558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 31564efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3157f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3158f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3159e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3160e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3161e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3162e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3163e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3164e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3166e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3167e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3168e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3169e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3170e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3171e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3172e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3173e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3174e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3175e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3176e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 3177e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3178e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3179e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 318051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3181e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3182e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3183e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3184e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3185e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3186e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3187e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3190e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3191e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3192e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3193e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3194e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3195e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3196e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3197e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3198e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3199e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3200e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 320151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3202e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3203e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3204e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3205e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3206e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3207e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3208e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3209e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3210e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3211e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3212e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3213e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3214e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3215e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3216e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3217f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3218e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3219e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3220e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3221f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3222e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3223e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3224e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3225e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3226e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3227e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3228e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3229e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3230e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3231e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3232e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3233f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3242e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3245e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3246180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3247180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3248180f47959a066795cc0f409433023af448bb0328Richard Smith 3249180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3250180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3251180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3252180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3253180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3254180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3255180f47959a066795cc0f409433023af448bb0328Richard Smith 3256180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3257180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3258180f47959a066795cc0f409433023af448bb0328Richard Smith 3259180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 326083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 326183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3262180f47959a066795cc0f409433023af448bb0328Richard Smith } 326351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3264180f47959a066795cc0f409433023af448bb0328Richard Smith 326559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3266180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3267180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3268180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3269180f47959a066795cc0f409433023af448bb0328Richard Smith} 3270180f47959a066795cc0f409433023af448bb0328Richard Smith 327151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 327251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 327351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 327451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 327551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 327651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 327751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 328051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 328151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 328251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 328351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 328451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 328551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 328651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 328751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 328851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 328951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 329051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3291b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 329251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 329351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3294b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3295b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 329651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 329751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 329851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 329951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 330051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3301b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3302b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 330351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 330451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 330551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 330651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 330751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3308b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 330951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 331051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 331183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 331251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 331351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 331451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 331551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 331651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 331751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 331851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 331951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 332051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 332151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 332251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 332351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 332451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 332551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 332651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 332751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 332851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 332951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 333051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3331b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 333251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 333351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 333483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 333551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 333651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3337b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 333851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 333951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 334059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 334159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 334259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 334359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 334459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 334559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 334659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 334759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 334859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 334959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 335059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 3351f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 335259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3353f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3354f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 335559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 335659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 335759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 335859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 335959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 336059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 336159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 336259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 336359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 336459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 336559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 336659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 336759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 336859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 336959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 337059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 337159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3372180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3373180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3374180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3375180f47959a066795cc0f409433023af448bb0328Richard Smith 3376180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3377ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3378ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3379ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3380180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3381ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3382ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3383ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3384ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3385ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3386ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3387180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3388ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 338983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3390180f47959a066795cc0f409433023af448bb0328Richard Smith } 3391180f47959a066795cc0f409433023af448bb0328Richard Smith 3392180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3393180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3394180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3395180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3396180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3397745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3398180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3399180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3400180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3401180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3402180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3403180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3404180f47959a066795cc0f409433023af448bb0328Richard Smith 3405180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3406180f47959a066795cc0f409433023af448bb0328Richard Smith 3407745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3408745f5147e065900267c85a5568785a1991d4838fRichard Smith 3409745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3410745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3411745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3412745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3413745f5147e065900267c85a5568785a1991d4838fRichard Smith 3414745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3415745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3416745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3417745f5147e065900267c85a5568785a1991d4838fRichard Smith 341883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3419745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3420745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3421745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3422180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3423745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3424180f47959a066795cc0f409433023af448bb0328Richard Smith } 3425180f47959a066795cc0f409433023af448bb0328Richard Smith } 3426180f47959a066795cc0f409433023af448bb0328Richard Smith 3427745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3428180f47959a066795cc0f409433023af448bb0328Richard Smith} 3429180f47959a066795cc0f409433023af448bb0328Richard Smith 3430180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3431180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 343251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 343351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3434ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3435ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3436ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3437ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 343851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 343951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 344051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 34416180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 34426180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 34436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 34446180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 34456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 34466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 34476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 34486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 34496180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3450180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3451180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3452180f47959a066795cc0f409433023af448bb0328Richard Smith 3453c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3454c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3455180f47959a066795cc0f409433023af448bb0328Richard Smith 3456610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 345751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3458180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3459180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3460180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3461180f47959a066795cc0f409433023af448bb0328Richard Smith 346251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 346351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 346451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3465180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3466745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3467f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3468f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3469180f47959a066795cc0f409433023af448bb0328Richard Smith} 3470180f47959a066795cc0f409433023af448bb0328Richard Smith 3471180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3472180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3473180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3474180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3475180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3476180f47959a066795cc0f409433023af448bb0328Richard Smith} 3477180f47959a066795cc0f409433023af448bb0328Richard Smith 3478180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3479e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3480e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3481e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3482e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3483e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3484e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3485e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3486e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3487e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3488e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3489e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3490e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3492e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 349483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 349583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3502e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3503e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3504e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3505e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3506e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3507e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3508e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3509e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3510e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3512e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3513e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3514e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3516e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3517e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3518e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3519e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3520e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3521af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3523e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3524e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3525e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 352659b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 352759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 352859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 352959b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3530770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 353107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 353207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 353359b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 35341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 353507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 353607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 35371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 353807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 353907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 354007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 354107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 354207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 354307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 354469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 354569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 354607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 354707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 354807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 354951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 35501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 355107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 355291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 355307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 355407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 355507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 355691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 35572217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 355891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 355959b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 356059b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 356159b5da6d853b4368b984700315adf7b37de05764Nate Begeman 356259b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3563c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 356407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 356559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 356659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 356707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 356807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3569c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 35701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3571d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3572e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 357359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 357446a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 357546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 357607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 357746a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 357846a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 357946a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3580f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 358107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 358246a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 358346a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 358446a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3585f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 358607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 358746a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 358807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 358946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3590c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3591c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 359207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 359307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3594e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3595e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3596e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3597e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3598e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3599e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3600e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3601e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3602e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3603e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3604e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3605e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3606e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3607e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3608e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3609e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3610e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3611e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3612e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3613e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3614e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3615e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3616e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3617e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3618e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3619e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3620e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3621e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3622e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3623e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3624e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3625e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3626e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3627e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3628e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3629e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3630e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3631e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3632e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 363346a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3634c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3635c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 363659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 363759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 363807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 363959b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 364007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 364159b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 364291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 36431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 364459b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 36455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 364659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 36473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 36483edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 36493edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 36503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 36513edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 36523edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 36533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 36543edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 36553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 36563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 36573edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 36583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 36593edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 36603edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 36613edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 36623edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 36633edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 366459b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 36653edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 36663edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 36673edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 36683edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 36693edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 36703edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 36713edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 367259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 367359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 36743edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 36753edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 36763edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 36773edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 36783edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 36793edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 36803edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 368159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 36823edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 368359b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 368407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 368559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 368659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 368707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 368851201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 368907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 369091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 369191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 369291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 369391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 369491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 369591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 369691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 369791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 36985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 369907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 370091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 370191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 370207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 37038327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 370451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 370591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 370691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 370759b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3708cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3709cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3710cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3711cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3712cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3713cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3714180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3715cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3716cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3717cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3718180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3719180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3720cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3721cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3722cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(V.isArray() && "Expected array type"); 3723cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3724cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3725cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3726cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 372751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3728180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3729180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3730180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3731f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3732180f47959a066795cc0f409433023af448bb0328Richard Smith 3733180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3734180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3735180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3736180f47959a066795cc0f409433023af448bb0328Richard Smith 373751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3738180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3740180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 374183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3742180f47959a066795cc0f409433023af448bb0328Richard Smith } 3743180f47959a066795cc0f409433023af448bb0328Richard Smith 3744cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3746cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3747cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3748cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3749180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3750180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 375151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3752180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3753cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3754cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3755cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3756cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3757cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3758f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3759cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3760974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3761974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3762ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3763974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3764974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3765974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3766974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3767974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith uint64_t NumElements = CAT->getSize().getZExtValue(); 3768974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Result = APValue(APValue::UninitArray(), NumElements, NumElements); 3769974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3770974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // Copy the string literal into the array. FIXME: Do this better. 3771b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LV.addArray(Info, E, CAT); 3772974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith for (uint64_t I = 0; I < NumElements; ++I) { 3773974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith CCValue Char; 3774974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!HandleLValueToRValueConversion(Info, E->getInit(0), 377583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CAT->getElementType(), LV, Char)) 377683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 377783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.getArrayInitializedElt(I) = Char.toAPValue(); 377883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!HandleLValueArrayAdjustment(Info, E->getInit(0), LV, 3779b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CAT->getElementType(), 1)) 3780974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3781974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3782974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return true; 3783974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3784974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3785745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3786745f5147e065900267c85a5568785a1991d4838fRichard Smith 3787cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3788cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3789180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3790b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3791180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3792cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3793180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 379483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 379583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3796745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3797745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3798745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3799745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3800745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3801745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3802180f47959a066795cc0f409433023af448bb0328Richard Smith } 3803cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3804745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3805cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3806180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3807180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3808180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3809180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 381083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 381183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3812cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3813cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3817f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3819ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3820ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3821ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 38266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 382751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 382851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3829ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3830ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3831ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 383251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 383351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3834b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 383551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 383683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 383751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 383851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 38396180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 38406180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 38416180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 38426180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 38436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 38446180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 38456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 38466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 38476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 38486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3852c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3853c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3860b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 386151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3862ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 386351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 386483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 386551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 386651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 386751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3869745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3874cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3875f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3876c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3877c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3878c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3879c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3880f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3881f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3882f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3883770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 38848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 388547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 3886f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 388747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 38888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3889f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3890973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 3891973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 38922ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3893973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 38943f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3895973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 38963f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 389747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 38983f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 38993f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 39003f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3901131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 39022ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39032ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 390430c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39053f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 390647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 3907575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3908575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3909131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3910131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3911131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3912131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 39132ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39142ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 391547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3916131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3917131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3918131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 39194f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 39204f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 39214f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 39224f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 392347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 39245930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3925342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3926342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3927342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 39288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 392932fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 39301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 393151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3932f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 39338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 39348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 39358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3936f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 39374c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3938131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39394c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 39404c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3941131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39424c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3943043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3944043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3945043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 39468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 39478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 39488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 39498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 3950043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3951043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 3952043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 3953c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3954043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 3955043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 39568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 39578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 3958043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3959043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 39608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 3961b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 39628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 3963b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 3964f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 39658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3966f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 39670518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 39683068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 3969131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39703068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 39711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3972f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 39733f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 397451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3975664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 3976664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 397764b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 39780dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 397964b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 398064b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 39816ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 39826ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 39836ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 39846ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 398521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 398621ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 398721ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 398821ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 3989552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 3990552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 3991552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 3992552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 3993722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 3994664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 3995664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 3996295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 3997ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 3998cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 3999fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 40008b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 40018b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 40021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 40038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4004664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4005f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4006f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4007f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4008c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4009c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4010c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4011c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4012c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4013c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4014c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4015c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 4016f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 401747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4018c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 40198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 402069ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 402169ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4022f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 402347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 4024f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4025f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4026f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4027f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4028f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 4029dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 403030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4031f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 403230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 403330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4034f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4035f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4036f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4037f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4038f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4039043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 40404c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4041bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4042973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4043973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4044973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4045973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4046973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4047973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4048973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4049973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4050973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4051973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4052973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4053973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4054973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4055973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4056973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4057973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4058973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4059bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 40608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 40614c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 40624c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4063a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4064a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4065a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4066a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 40677c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4068a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4069a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4070a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4071a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4072a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4073a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4074a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4075a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4076a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4077a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4078a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 40791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 40801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4081a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4082a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4083a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 40841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4085a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4086a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4087a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4088a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4089a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4090a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4091a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4092a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4093a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4094a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4095a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4096a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4097a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4098a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4099a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4100a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4101a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4102a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4103a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4104a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4105a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4106fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4107a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4108a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4109a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4110a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4111a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4112a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4113a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4114a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4115b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4116a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4117a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 411880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 411980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 412080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 412180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 412280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 412380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 412480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 412580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 412680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 412780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 412880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 412980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 413080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 413180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 413280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 413380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 413480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 413580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 413680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 413780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 413880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 413980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 414080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 414180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 414280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 414380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 414480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 414580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 414680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 414780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 414880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 414980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 415080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 415180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 415280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 415380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 415480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 415580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 415680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 415780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 415880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 415980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 416080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 416180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 416280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 416380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 416480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 416580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 416680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 416780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 416880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 416980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 417080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 417180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 417280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 417342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 417442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 41751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 41761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 41771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 417842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 41791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 41801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 41811bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 418242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 418342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 418442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 418542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 418642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 41878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 418842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 418942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 419042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 419142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 419242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 419342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 41941bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 419542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 41961bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 419742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 419842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 41991357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 420042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 420142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4202f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 420342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 420442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 420542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 420642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 420742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 420842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 420942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 421042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 42114f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 421242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 421342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4215180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4216019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 42178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 421864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 421964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 422042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 422142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 422264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4223b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4224b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4225393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4226a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4227cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 422864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 422964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4230c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4231f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 423264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 423364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4234019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4235131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 42361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 423780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 423880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4239e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 424021fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4241a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4242bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 424321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 424421fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4245c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4246c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4247c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 424840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 42495726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 425040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 425140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 425240b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 425340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 425440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 425540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 425640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 42575726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 42585726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 42595726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 42608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 42615726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 42625726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 42635726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 42645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 42655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 42665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 42675726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 42685726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 42695726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 42705726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 42715726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4272f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4273454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4274454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4275454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4276454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4277454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4278454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4279454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4280454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4281454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4282454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4283454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4284454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4285454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4286454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4287454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4288454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4289454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4290454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4291454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4292454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4293454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4294454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4295454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4296f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4297454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4298454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4299454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4300454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4301454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4302454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4303454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4304454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4305454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4306454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4307454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4308454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4309454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4310454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4311454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4312454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4313454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4314454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4315f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4316454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4317019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 43184c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4319f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4320625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4321625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4322625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4323625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4324625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4325625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 43261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 43271bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4328625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4329625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4330625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4331625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 43329a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4333625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4334625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4335625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4336625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 433783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4338625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4339625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 43407b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 43417b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 43427b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 43437b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 43447b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 43457b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 43467b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 43477b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 43487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 43497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 43507b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 43517b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 43527b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 43537b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 43547b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 43557b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 43567b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4357b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4358c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4359f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4360c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 43612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 43628327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 43638327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4364a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4365a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4366a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 4367a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 4368a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // necessarily integral 4369fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 43701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4371c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 437251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 437351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 43742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 43753f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4376a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4377c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 43782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4379131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 43804bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4381131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 43824bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 43834bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 4384f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: If both evaluations fail, we should produce the diagnostic from 4385f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // the LHS. If the LHS is non-constant and the RHS is unevaluatable, it's 4386f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // less clear how to diagnose this. 4387c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 43884bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 43894bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4390f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) { 4391131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar // Since we weren't able to evaluate the left hand side, it 4392fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson // must have had side effects. 43931e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Info.EvalStatus.HasSideEffects = true; 4394131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4395131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 43964bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 43974bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4398a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4399a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4400a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4401c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 440254176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4403286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4404286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 44054087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 44064087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 44074087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4408f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 44094087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4410745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4411745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 44124087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 44134087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4414745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 44154087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 44164087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 44174087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 44181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 44194087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 44201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 44214087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 44224087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 44232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4424131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4425131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4426131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 44272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4428131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 44291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4430fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4431fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 44321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4433fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4434fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4435131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 44364087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 44372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4438131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4439131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4440131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 44412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4442131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4443131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4444131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4445131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 44464087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 44474087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 44481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4449286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4450286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4451286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 44521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4453745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4454745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4455286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 44561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4457745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4458286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 44591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4460286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4461529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4462286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4463286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4464b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 44652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4466131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 44672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4468131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 44692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4470131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 44712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 44721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4473131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 44742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4475131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 44762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 44771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4478fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4479fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4480286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4481286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 44821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4483ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4484625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4485745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4486745f5147e065900267c85a5568785a1991d4838fRichard Smith 4487745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4488745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 44893068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4490a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4491745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 44923068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4493a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4494625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4495625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4496625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 449765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 449865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 449965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 450065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 450165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 450265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 450365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 450465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 450565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 450665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 450765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 450865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 45095930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 45105930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 45115930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 45125930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 451365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 451465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 451565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 45169e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 45179e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 45185bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4519f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4520ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4521ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4522c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4523ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4524ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4525f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 45269e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4527b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4528b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4529b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 453074f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 453174f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4532f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 45339e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 45349e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 45359e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4536f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 45379e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4538c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4539c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4540c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 45419e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 45425bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4543a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 454415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 454515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 454615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4547f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4548f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4549f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 45502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4551f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4552f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4553f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4554f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4555f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4556f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4557f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4558f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4559f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 45604992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 45614992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 45623068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4563180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 4564180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, ElementType, ElementSize)) 4565180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4566a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 456715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 456815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 456915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 457015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 457115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 457215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 457315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 457415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 457515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 457615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 457715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 457815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 457915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 458015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 458115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 458215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 458315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 458415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 458515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 458615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4587ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4588625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 458982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 459082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 459182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 459282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 459382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 459482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 459582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 459682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4597f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 459882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 459982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4600f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4601f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4602f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4603f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4604f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4605f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4606f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4607f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4608f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4609f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4610f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4611f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4612f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4613f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4614f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4615f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4616f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4617f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4618f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4619f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4620f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4621f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4622f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4623f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4624f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4625f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4626f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4627f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4628f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4629f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4630f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4631f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4632f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4633f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4634f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4635f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4636f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4637f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4638f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4639f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4640f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4641f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4642625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4643625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4644625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4645625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4646625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4647625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4648625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4649625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4650ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 46513068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 46523068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4653b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4654b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4655b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4656b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4657b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4658b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4659b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4660b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4661b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4662b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4663b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4664b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4665b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4666b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4667b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4668b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4669b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4670b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4671b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4672b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4673b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4674b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4675b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4676b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4677b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4678b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4679b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4680b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4681b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4682b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4683b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4684b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4685b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4686b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4687b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4688b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4689b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4690b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4691b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 469226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 469326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 469426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 469526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 469626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 469726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 469826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 469926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 470026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 470126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 47022ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 47032ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4705e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4706a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4707a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4708a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 470947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4710745f5147e065900267c85a5568785a1991d4838fRichard Smith 4711745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4712745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4713f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4714d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4715745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 471630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4717745f5147e065900267c85a5568785a1991d4838fRichard Smith 471847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 471942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 472042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4721c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4722a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4723a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 47242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 472547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 472642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 472747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 472847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 472942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 473042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 473142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 473242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 47332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4734c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 473547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 473647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 473747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 473842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 473942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 474042edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 474165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 474265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 474365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 474465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 474565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 474665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 474765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 474865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 474965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 475065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 475165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 475265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 475365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 47545930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 47555930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 47565930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 47575930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 475865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 475965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 476065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 476165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 476242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4763c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4764f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4765a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4766c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4767c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 476842edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4769a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 477032fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4771f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 47727b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 47737b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 47747b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 47757b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 47767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 47777b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 47787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 47797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 47807b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 47817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 47827b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 47837b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4784c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4785c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4786c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 47872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 47883df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 478954176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4790f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 47913df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 47923df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4793789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4794789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4795789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 47963df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 47972de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4798789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4799789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4800091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4801789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4802091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4803091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4804091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4805091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4806091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4807789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4808789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4809789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4810789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4811789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4812789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4813789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4814789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4815925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith // operand, and must not overflow the corresponding unsigned type. 4816789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4817789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4818925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith else if (LHS.countLeadingZeros() < SA) 4819925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith CCEDiag(E, diag::note_constexpr_lshift_discards); 4820789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4821789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 48233f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 48242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4825789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4826789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4827091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4828789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4829091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4830091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4831091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4832091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4833091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4834789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4835789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4836789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4837789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4838789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4839789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4840789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4841c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 48423f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 48431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4844c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4845c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4846c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4847c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4848c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4849c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4850b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4851a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4852a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 48538b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 48545d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 48555d484e8cf710207010720589d89602233de61d01Sebastian Redl // the result is the size of the referenced type." 48565d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 48575d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 48585d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 48595d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 48609f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 48619f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 48629f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 48639f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4864e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4865e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 48668b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4867af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4868af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4869af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 48701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 4871af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 48728b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 48738b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4874a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4875af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 48768b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 48778b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 4878af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 4879e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 4880e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4881e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4882e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 4883f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 4884f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 4885f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 4886f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 4887f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 4888f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 4889e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 48904f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 4891e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 48924f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 4893e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 4894a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4895f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 4896f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 48970518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 4898f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 4899f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 4900a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4901f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 4902f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 4903f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 4904f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 4905f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4906f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 4907f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 4908f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 4909f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4910f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4911f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 4912f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 4913f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 4914f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 4915f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 4916f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // result shall be the alignment of the referenced type." 4917f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 4918f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 4919f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 4920180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 4921180f47959a066795cc0f409433023af448bb0328Richard Smith if (!HandleSizeof(Info, SrcTy, Sizeof)) 4922f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 4923180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 4924f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4925f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 4926f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 4927f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 4928fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 4929fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 49308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 49318ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 49328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 49338ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 4934f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 49358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 49368ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 49378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 49388ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 49398ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 49408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 49418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 49428ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 49438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 49448ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 49458ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 4946f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 49478ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 49488ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 49498ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 49508ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 49518ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4952f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 49538ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 49548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 49558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4956f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4957f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 49588ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 49598ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4960ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 4961cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 4962fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 49638ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 49648ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 49658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 4966f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 49678ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 49688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 4969f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 4970cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 4971cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 4972cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 4973f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4974cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4975cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 4976cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 4977f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 4978f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4979cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 4980cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 4981cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4982cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 4983cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 4984cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 4985cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 4986f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 4987cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 4988cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 49897c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 4990cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 4991cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 49928ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 49938ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 49948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 49958ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 49968ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 4997b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 499875a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 49994c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 500075a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 500175a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5002f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 50032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 50044c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 50054c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5006f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 50072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5008c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5009f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5010f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5011f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5012f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5013f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5014789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5015789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5016789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5017789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5018789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5019f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5020f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5021f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5022f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5023f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5024f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5025f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5026f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5027f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5028f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5029f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5030f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5031f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 503206a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5033a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 50341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5035732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5036732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 50378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 50388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 503982206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5040b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 504182206e267ce6cc709797127616f64672d255b310Anders Carlsson 504246a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 504346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 504446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 504546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 504646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 504746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 504846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 504946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 505046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 505146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 505246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 505346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 50544d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 505546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 505646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 505746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 505846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 505946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 506046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 50611d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 50621d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 506346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 506446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 506546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 506646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 506746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 506846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 506946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 507046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 507146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 507246a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 507346a523285928aa07bf14803178dc04616ac85994Eli Friedman 5074e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 507546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 507646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 507733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 507833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 507933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 508033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 508246a523285928aa07bf14803178dc04616ac85994Eli Friedman 50837d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 508446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 50857a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 50867a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 508746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5088c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 508946a523285928aa07bf14803178dc04616ac85994Eli Friedman 509046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 509146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 509246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 509346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 509446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 509546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 50964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5097c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 50984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5099131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 51004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 51014efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 510246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5103732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5104b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5105a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5106be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 510765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 510865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 510965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 511065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 511165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 511265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 511365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5114be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5115be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5116be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 511730c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5118f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5119f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5120732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 51211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 512246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5123c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5124c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5125efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 512687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5127b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 51284efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5129dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5130dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5131f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5132f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5133f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5134dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5135f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5136dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5137b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5138efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5139dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5140dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 51414efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5142a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5143a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5144f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 51452bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 51464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 514746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5148f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 51491725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 51501725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 515146a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 51521725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 51532217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 515446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 515546a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 515646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 515746a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5158732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5159c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5160c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5161c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5162c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 516346a523285928aa07bf14803178dc04616ac85994Eli Friedman } 516446a523285928aa07bf14803178dc04616ac85994Eli Friedman } 51651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 516646a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5167a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 51682bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5169722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5170722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5171f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5172f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5173f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5174f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5175f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5176722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5177722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5178722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5179722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5180722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5181722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5182664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5183722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5184f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5185f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5186f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5187f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5188f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5189722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5190722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5191722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 51928327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5193664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5194664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5195664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5196ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5197ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5198ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5199ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5200295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5201295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5202295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5203295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5204f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5205d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5206d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5207d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5208d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5209770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 52108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5211d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5212d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5213d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 52148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5215d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 521647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 52178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 52188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 52198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5220d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 522151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5222f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5223f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5224f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5225f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5226019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5227d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 52285db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5229d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5230d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 52318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 52322217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5233abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5234abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5235ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 523651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5237d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5238d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5239d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5240d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5241c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 52428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5243d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5244d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 52454ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5246db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5247db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5248db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5249db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5250db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5251db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5252db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5253db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5254db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5255db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5256db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5257db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5258db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5259db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5260db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5261db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5262db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5263db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5264db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5265db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5266db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5267db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5268db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5269db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5270019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5271180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 52728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 52738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 52748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5275019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5276019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5277019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5278019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5279019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 52807cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 52817cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 52827cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 528334a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 528434a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 52857cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 52861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5287db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5288db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5289db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5290f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5291f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5292f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5294db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 52959e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 52969e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 52979e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 52984572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 52999e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5300f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5301f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5303f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 53045db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 53055db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 53065db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 53075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 53085db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 53095db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 53101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 53115db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 53125db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 53135db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 53145db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 53151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 53161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 53175db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 53185db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 53195db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 53205db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 53215db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 53225db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 53235db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 53245db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5325019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5326019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5327019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5328abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 532943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 533043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 533143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 533243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 533343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 533443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 533543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 533643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 533743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5338abd3a857ace59100305790545d1baae5877b8945John McCall} 5339abd3a857ace59100305790545d1baae5877b8945John McCall 5340abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 534143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 534243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 534343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 534443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 534543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 534643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 534743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 534843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 53498327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 535043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 535143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5352abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5353abd3a857ace59100305790545d1baae5877b8945John McCall} 5354abd3a857ace59100305790545d1baae5877b8945John McCall 53555db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 53565db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5357f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 53582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 53597993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 53602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 53617993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 53627993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 53635db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 53645db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 53655db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 53665db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5367019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5368d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5369e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5370e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 537196e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 53725db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5373745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5374745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5375d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5376745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5377d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5378d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5379d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5380f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 53812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5382d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 53837b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 53842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5385d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 53867b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 53872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5388d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 53897b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 53902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5391d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 53927b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5393d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 53947b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 53957b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 53967b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 53977b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5398d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5399d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5400d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5401d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5402d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5403d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5404d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 54058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 54068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 54071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54082a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 54092a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5410c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 54112a523eec6a31955be876625819b89e8dc5def707Eli Friedman 54122a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 54134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5414c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5415c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5416c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 54174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 54182a523eec6a31955be876625819b89e8dc5def707Eli Friedman 54192a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 54204efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 54214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5422c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5423c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 54244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5425f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 54262a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5427f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5428f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5429f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5430f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5431f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5432f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 54332a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 54344efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 54354efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5436d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5437a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 54389ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 54399ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 54409ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5441770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 54428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5443f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 54441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54459ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5446f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 54478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 54481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 544947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 54508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 54518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 54528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 54531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54547ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 54557ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 54568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 54578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 54588cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 54599ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 54608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 54618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5462b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 546396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 54647ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5465b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5466b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 54671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5468b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5469b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5470c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 54718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5472b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5473b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 54747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5475f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 54767ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 54777ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 54787ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 54797ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 54807ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 54817ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 54827ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 54837ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 54847ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 54857ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 54867ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 54877ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 54887ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 54897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 54908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 54918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5492b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5493b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5494b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5495b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5496b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5497b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5498b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5499b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5500b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5501b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5502b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5503b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5504b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5505b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5506b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5507b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5508b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5509b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5510b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5511b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5512b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5513b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5514b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5516b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 55188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 55198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 55208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 55218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 55228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 55238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 55248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 55258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 55268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 55278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 55288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 55298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 55308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 55314d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 55328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 55338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 55348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 55358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 55368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 55378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 55388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 55398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 55408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 55418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 55428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 55438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 55441d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 55451d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 55468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 55478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 55488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 55498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 55508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 55518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 555233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 555333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 555433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 555533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 55568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 55578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 55597a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 55607a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 55618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5562c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 55632bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 55648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 556546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 55668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5567f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 55688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5570b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 55718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5572b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5573b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 55748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 55758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 55768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 55778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 55788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 55808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 55818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 55828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 55848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 55858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 55868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5587c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5588c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 55898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 55908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55918786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 55928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 55938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 55948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 55958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 55968786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 55978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 55988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5599c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5600c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5601c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5602c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 56038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5606b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 56078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5608b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 56099ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 56108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 56118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 56128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 56138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 56168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5617b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5618ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 56198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56221725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5623f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5624f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 56258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 56268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 56278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 56298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 56308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 56318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 56338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 56348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 56358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5636c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5637c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5638c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5639c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 56408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5641ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 56421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 56449ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 56459ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5646f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 56482ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 56492ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5650745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5651745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5652f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 56531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5655745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5657a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 56583f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 56593f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5660ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5661f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 56622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5663a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5664a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5665a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5666a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5667a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5668a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5669a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5670a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5671a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 56723f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 56732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5674a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5675a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5676a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5677a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5678a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5679a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5680a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5681a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5682a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 56833f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 56842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 56853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5686f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 56873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 56883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 56893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 56903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 56911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56923f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 56933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 56943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 56953f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 56963f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 56973f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 56983f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 56993f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 57003f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 57013f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 57023f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 57033f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 57043f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 57053f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5706f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 57071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 57083f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 57093f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 57101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 57113f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 57123f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 57133f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 57143f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 571596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 571696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 571796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 571896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 571996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 572096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 572196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 572296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 572396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 572496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 572596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 572696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 572796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 572896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 572996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 573096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 573196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 573296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 573396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 573496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 573596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 573696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 573796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 573896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 573996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 574096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 574196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 574296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 574396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 574496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5745f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5746f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5747f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 574896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 574996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 575096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 575196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 575296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 575396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 575496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 575596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 575696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 575796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 575896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5759ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5760ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5761f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5762ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5763ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 576496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 576596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 576696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 576796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 576896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 576996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 577096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5771f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 577296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 577396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 577496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 577596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 577696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 577796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 577896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 577996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 578096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 578196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 578296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 578396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 578496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 578596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 578696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 578796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 578896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 578996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 579096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 579196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 579296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 579396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 579496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 579596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 57967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 57977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 57987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 57997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 58007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 58017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 58037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 58057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 58067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 58077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 58097ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 58107ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58117ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 58127ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58137ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 58147ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 58157ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 58169ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5817aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5818aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5819aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5820aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5821aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5822aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5823aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5824aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5825aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5826aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5827aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5828aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5829aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5830aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5831aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5832aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5833aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5834aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5835aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5836aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5837aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5838aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5839aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5840aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5841aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5842aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5843aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5844aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5845aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5846aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 584751f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5848f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5849f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 585047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5851c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5852c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5853c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5855c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5857c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5858c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 58591e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 586059b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5861575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 58621e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 58636dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5864efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5865efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5866efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 58676dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 58681e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5869efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5870efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 5871efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 58726dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 587347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 5874efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 5875efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 5876efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 5877660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 58781e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 587969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 5880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 5881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 5882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 5883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 5884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 588551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 5886180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 588783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5888180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5889cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 5890180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 589151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 5892180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 589383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 5894180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 5895180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5896180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 5897aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 5898c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 5899c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 5900c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 5901c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 5902c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5903aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 5904aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 5905c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 5906c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 5907c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5908f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 5909dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 5910660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 5911f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5912660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 5913660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 5914660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 5915660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 591683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 591783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 591883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 591983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 592083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 592183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 59227ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 592351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 592451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 592551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 592669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 592769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 5928180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 5929180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 5930180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 5931180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 593269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 593369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 593469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 593569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 593683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(CoreConstResult, Info, E)) 593783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 593883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = CoreConstResult.toAPValue(); 593983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 594069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 594169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 5942f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 5943f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 5944f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 594551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 594651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 594751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 5948f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 5949f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 5950f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5951f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5952f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 5953f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 5954f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 5955f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 5956f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5957f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5958f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5959f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 5960f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 596183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = Value.toAPValue(); 596283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 5963f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 5964c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 596551f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 596656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 596756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 5968c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 5969c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 597051f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 5971ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 5972ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 5973ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 5974ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 5975ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 5976ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 5977ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 5978ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 59792d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 59802d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 5981e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 5982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 59831445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 59841445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 5985f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 5986f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 598756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 598856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 59894ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 59904ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 5991c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 599251f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 5993b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 5994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 599547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 5996cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 5997cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 599880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 599980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 600080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 600180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 600280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6003c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 600480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 600580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6006c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6007f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6008c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6009c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6010a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6011a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 60124ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 60131b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 60141b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6015efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 601683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 601783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 601883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 601983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 602083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 602183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Tmp; 602283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.moveInto(Tmp); 602383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.Val = Tmp.toAPValue(); 602483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6025b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6026b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6027099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6028099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6029099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 60302d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 60312d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 60322d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 60332d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 60342d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 60352d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6036099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6037099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6038099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6039099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6040099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6041099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6042099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6043099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6044099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 604551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 604651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 604751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 604851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 604951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 605051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 605151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 605283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 605383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 605451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 605551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 605651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 605783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 605883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 605983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 606083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 606183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 606283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 606383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6064099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6065099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 606651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 606751f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 60684ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 60694fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 607051f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 607145b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 607251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 60734ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 60741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6075393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6076393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6077a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 60781c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 607951f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6080c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 608151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 60821c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 608351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 60841c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 608551fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6086d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6087e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6088e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6089e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6090e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6091e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6092e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6093d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6094d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6095d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6096d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6097d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6098d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6099d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6100d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6101d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6102d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6103d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6104d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6105d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6106d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6107d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6108d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6109d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6110d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 611151f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6112d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6113d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6114d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6115d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6116d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 61173c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 61183c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6119d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6120d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6121d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6122d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6123d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6124d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6125d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6126d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6127d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 61283c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 61293c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 61303c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6131d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6132d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6133d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 613451f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6135d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6136d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6137d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6138d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6139d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6140d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6141d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6142d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 61432ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6144d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6145d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6146d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6147d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 614863c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6149d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6150d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6151d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6152d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6153d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6154d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6155d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6156d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6157d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6158d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6159d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6160d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6161d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6162d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6163d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6164d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6165d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6166d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6167d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6168e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6169d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6170d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 61719be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6172d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 6173d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6174d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6175d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6176d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6177d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6178d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6179d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6180d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6181d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 61824765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6183d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6184d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6185d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6186d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6187d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6188d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6189d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6190d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6191d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6192d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6193d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6194d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6195d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6196d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6197d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 6198d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 61997cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6200be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6201c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 620261eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6203f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 620403e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 62054b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6206276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6207cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 620801d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6209cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6210cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6211ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6212d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6213d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6214d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6215d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 621691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 621791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 621891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 621991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6220d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6221d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6222f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6223f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6224d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6225d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6226d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6227ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6228d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 62296ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 623021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6231552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 62322e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6233d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6234d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 62356cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 623605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 623705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 623805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6239d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6240180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6242d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6243d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 6245d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6246d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 624703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 6248d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 6249d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6253d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6256d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6257d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6258d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6259d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6260db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6261db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6262db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6263099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6264099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6265099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6266099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6267099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6268099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6269099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6272d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6273d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6274d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6275d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 62762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 62772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 62782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 62792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 62802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 62812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 628205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 628305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 628405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6285d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 62862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 62872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 62882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 62892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 62902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 62912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 62922de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6293d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6294d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6295d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6296d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6297d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6298d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6299d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 630051f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 630105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6302d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6303d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6304d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6305d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6306d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6307f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6308f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6309f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6310f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6311d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6312d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6313d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6314d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6315d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6316d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 63172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 63182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 63192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 63202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 63212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 63222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 63232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 63242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 63252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 63262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 63272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 63282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 63292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 633005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 633105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 633205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6333d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6334d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 63352de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 63362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 63372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 63382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 63392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 63402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 63412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 63422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 63432de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 63442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 63452de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 63462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 63472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 63482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 63492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 63502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 63512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6352d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6353d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 63542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 63552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 635651f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6357d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 63583b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6359a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6360d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6361d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6362d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6363a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6364d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6365d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6366d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6367d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6368d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 63692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 6370d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 6371d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6372d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6373d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6375d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6376d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6378d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6379d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6380d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6381d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6382d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6383d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 63842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 63852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6386d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6388d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6389d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6390d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6391d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 63922de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6393a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6394d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6395d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6396d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6397d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6398d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6399d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6400d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6402d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6403d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6404d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6405d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6406d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6407d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6408d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 640932cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6410f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6411d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 64122116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 64132116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 64142116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 64152116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 64162116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 64172116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 64182116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 64192116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 64202116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 64212116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 64222116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 64232116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 64242116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 64252116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 64262116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 64272116b144cf07f2574d20517187eb8863645376ebRichard Smith } 64282116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6429eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6430eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 64317a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 64327a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6433eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6434eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6435eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6436d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6437eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6438eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6439eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6440d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 644156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 644256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 644356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 644456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 644556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 644656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 644756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 644856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6449a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 645056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 645156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6453d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6455d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6456d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6458d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6459d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 646080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 646180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6462d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6463d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 646563fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6466f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6467f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 646863fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6469d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6470d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6473d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6474d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6476d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6477d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6478d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6479d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6480a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6483d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6484d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6485d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6486d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6487d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6488d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6490d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64923026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6495f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6500f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 65054c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 65064c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6507dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6508dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 65094c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 65104c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6511dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6514dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6515f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6516f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6517f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6518d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6519d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6520d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6521d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6522d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6523f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6524f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6525f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6526f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6528f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6529f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6530f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6531f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6532f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6533f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 65374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 653870488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 653970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 654070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 654170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 65424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 65434c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 65444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 65454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 65464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 65474c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 654870488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 65494c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 65504c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 65514c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 65524c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 65534c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 65544c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 65554c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 65564c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 65574c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 65584c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 65594c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 65604c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 65614c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 65624c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 65634c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 65644c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 65654c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 65664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6567745f5147e065900267c85a5568785a1991d4838fRichard Smith 6568745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6569745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6570745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6571745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6572745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6573745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6574745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6575745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6576745f5147e065900267c85a5568785a1991d4838fRichard Smith 6577745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6578745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6579745f5147e065900267c85a5568785a1991d4838fRichard Smith 6580745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6581745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6582745f5147e065900267c85a5568785a1991d4838fRichard Smith 6583745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6584745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6585745f5147e065900267c85a5568785a1991d4838fRichard Smith 6586745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6587745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6588745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6589745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 659083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6591745f5147e065900267c85a5568785a1991d4838fRichard Smith 6592745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6593745f5147e065900267c85a5568785a1991d4838fRichard Smith 6594745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6595745f5147e065900267c85a5568785a1991d4838fRichard Smith 6596745f5147e065900267c85a5568785a1991d4838fRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 659783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue Scratch; 6598745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 659983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 660083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Scratch; 6601745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6602745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 660383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 6604745f5147e065900267c85a5568785a1991d4838fRichard Smith 6605745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6606745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6607