ExprConstant.cpp revision 51e47df5a57430f1b691b04258e663cce68aef9d
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; 10886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (Type->isAnyComplexType()) { 10986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith const ComplexType *CT = Type->castAs<ComplexType>(); 11086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Type = CT->getElementType(); 11186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ArraySize = 2; 11286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedLength = I + 1; 113b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1189a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1219a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1239a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1249a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 127b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex, 12886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CSK_This, CSK_Real, CSK_Imag 129b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 130b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 138b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 146b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 150b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1529a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1539a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1540a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 157b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 159b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 160b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 161b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1669a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1689a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 172b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1790a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1810a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 182b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 183b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 185b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 200b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 212b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 218180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 219180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 22986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith /// Update this designator to refer to the given complex component. 23086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplexUnchecked(QualType EltTy, bool Imag) { 23186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith PathEntry Entry; 23286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entry.ArrayIndex = Imag; 23386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entries.push_back(Entry); 23486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 23586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // This is technically a most-derived object, though in practice this 23686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // is unlikely to matter. 23786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedType = EltTy; 23886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedArraySize = 2; 23986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedPathLength = Entries.size(); 24086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 241b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 243b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 245b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2469a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 247b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 248b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 249b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 250b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2520a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 253b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 254b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 256b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 257b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 258b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 259b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 260b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 261b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 263b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2640a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 26747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 26847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 271e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 27347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 27447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 27547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 2760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 27947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 280177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 281177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 28247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 28347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 28447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 28547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 28647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 28747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 28883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(const CCValue &V) : APValue(V), Designator(V.Designator) {} 28983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(LValueBase B, const CharUnits &O, unsigned I, 2900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 29183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(B, O, APValue::NoLValuePath(), I), Designator(D) {} 292b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 29383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(V), Designator(Ctx, V) { 29483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 29865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 29965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 30047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 3010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 3020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 3030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 3040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 3050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 3060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 3070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 30883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue toAPValue() const { 30983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!isLValue()) 31083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return *this; 31183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 31283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Designator.Invalid) { 31383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // This is not a core constant expression. An appropriate diagnostic 31483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // will have already been produced. 31583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 31683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue::NoLValuePath(), getLValueCallIndex()); 31783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 31883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 31983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 32083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Designator.Entries, Designator.IsOnePastTheEnd, 32183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith getLValueCallIndex()); 32283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 32347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 32447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 325bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 326bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 327bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 328bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 329bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 330bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 331bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 33208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 33308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 33408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 33508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 33608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 33708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// Index - The call index of this call. 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned Index; 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 341180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 342180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 343180f47959a066795cc0f409433023af448bb0328Richard Smith 344bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 345bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 346bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 347bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 348bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 349bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 350bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 351bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 352bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 35308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 35408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 355180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 356bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 357bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 358bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 359dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 360dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 361dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 362dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 363dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 364dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 365dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 366dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 367dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 368dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 369dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 370dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 371dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 372dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 373789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 374789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 375789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 376789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 377789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 378789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 379789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 380789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 381789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 382789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 383789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 384789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 385789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 386789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 387789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 388789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 389789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 390789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 391dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 392dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 39383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 39483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 39583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 39683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 39783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 39883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 39983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 40083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 40183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 40283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 40383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 40483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 40583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 40683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 407c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 408dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 4091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4101e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 4111e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 412f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 413d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 414bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 415d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 416d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 417d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 418d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 41983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 42083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 42183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 42247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 423bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 424bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 425c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 426bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 427bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 428745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 429bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 430bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 431180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 432180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 433180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 434180f47959a066795cc0f409433023af448bb0328Richard Smith 435180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 436180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 437180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 438180f47959a066795cc0f409433023af448bb0328Richard Smith 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 441c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 442c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 443745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 444745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 445745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 446745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 447745f5147e065900267c85a5568785a1991d4838fRichard Smith 448bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 449bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 450dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 45183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 45283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 453745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 454745f5147e065900267c85a5568785a1991d4838fRichard Smith CheckingPotentialConstantExpression(false) {} 455bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 45647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 457c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 458c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 459c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 460c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 46156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 462180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 463180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 464180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 465180f47959a066795cc0f409433023af448bb0328Richard Smith } 466180f47959a066795cc0f409433023af448bb0328Richard Smith 467c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 468c18c42345636e2866fed75c7e434fb659d747672Richard Smith 469c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 470745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 471745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 472745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 473745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 47483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 47583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 47683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 47783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 47883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 480c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 482c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 483c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 484c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 485f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 48683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 48783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 48883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 48983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 49083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 49183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 49283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 49383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 49483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 49583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 501c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 502c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 503c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 50408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 50508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 50608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 507c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 508f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 5097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 5107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 511c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 515dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 51608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 51708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 51808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 51908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 520745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 521745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 52208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 523c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 524dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 52508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 52608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 527745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 528745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 52908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 530dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 531c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 532dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 533dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 534dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 535dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 536dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 5377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 5387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 539c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 540dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 54151e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 54251e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 543dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 54451e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 545c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 546c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 547c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 548c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 549c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 550c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 551c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 552c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 553f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 554099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 555099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 556099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 557099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 558099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 559099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 560099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 561099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 562745f5147e065900267c85a5568785a1991d4838fRichard Smith 563745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 564745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 565745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 56674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 56774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 568745f5147e065900267c85a5568785a1991d4838fRichard Smith } 569c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 570f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 571f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 572f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 573f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 574f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 575f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 576f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 577f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 578f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 579f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 580f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 581f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 582f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 583f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 584f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 585f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 58674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 58774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 58874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 58974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 59074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 59174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 59274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 59374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 59474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 59574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 59674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 59774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 59874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 59974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 60074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 60174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 60274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 60374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 606b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 607b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 608b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 609b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 610b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 611b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 612b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 613b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 614b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 615b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 616b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 617b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 618b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 619b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 620b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 621b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 622b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 623b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 624b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 625b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 626b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 627b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 628b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 629b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 630b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 63583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 64587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 64908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6505ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6515ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 65208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 65408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 65508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 65708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6585fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 65908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 66008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 66108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 66208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 66308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 66408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 66508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 66683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Convert the CCValue to an APValue without checking for constantness. 66708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 66808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 66983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueDesignator().IsOnePastTheEnd, 67083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueCallIndex()); 67108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 67208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 67308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 67408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 67508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 676bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 677d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 67808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 67908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 68008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 68108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 68208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 68308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 68408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 68508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 68608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 68708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 68808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 68908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 69008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 69108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 69208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 69308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 69408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 69508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 69608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 69708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 69808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 69908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 70008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 70108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 70208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 70308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 70408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 70508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 70608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 70708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 708bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 70908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 710d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 71108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 712f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 713f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 714f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 715f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 716f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 717f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 718f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 719f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 720f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 721f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 722f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 723f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 724f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 725f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 726f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 727f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 728f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 729f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 730f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 731f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 73247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 733f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 73447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 735f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 73647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 737f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 73847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 73956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 74056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 74156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 74256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 74356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 74456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 74556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 74656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 74756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 74856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 74956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 750f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 751efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 752efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 7531bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 754efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 75583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 7560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 757efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 75947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 760625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 76183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7630a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 764efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 76547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 76683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith V = CCValue(Base, Offset, CallIndex, Designator); 767efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 76847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 76947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 77047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 77147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 77283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 7740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 77683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 77983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 780b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 781b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 782b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 783b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 784b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 785b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 786b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 787b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 788b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 789b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 790b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 791b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 792b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 793b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 794b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 795b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 796b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 797b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 798b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 799b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 800b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 801b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 802b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 803b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 804b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 805b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 806b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 807b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 808b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 809b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 810b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 811b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 812b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 813b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 81486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 81586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real); 81686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Designator.addComplexUnchecked(EltTy, Imag); 81786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 818b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 819b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 820b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 821b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 82256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 823efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 913c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 914b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 915b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 916b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 917b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 918b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 919b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 920b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 921b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 922b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 923c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 924c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 925c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 926c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 927c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 928c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 929f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 93087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 93147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 93283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 93383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 93483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 93583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 936efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 937efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 94187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 94247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 943d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 944d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 945f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 946f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 947f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 9484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 9494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 9504efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 951180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 952180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 953180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 954180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 955180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 956180f47959a066795cc0f409433023af448bb0328Richard Smith} 957180f47959a066795cc0f409433023af448bb0328Richard Smith 9581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 959180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 960180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 961180f47959a066795cc0f409433023af448bb0328Richard Smith 962180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 963180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 96542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 967180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9681bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 96942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9701bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9711bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 97242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 978b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 979b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 980b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 981b78ae9716576399145786b93f687943f8b197170Richard Smith } 982180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 983180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 984180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 985180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 986180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 98747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 988180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 989180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 990180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 991180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 992180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 993180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 994180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 995180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 996180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 997180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 998745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 999745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 1000745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 1001745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 1002745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 1003745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 1004745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 1005745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 1006180f47959a066795cc0f409433023af448bb0328Richard Smith } 100742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 100842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 100983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 101083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 101183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 101283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 101383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 101483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 101583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 101683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 101783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 101883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 10199a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 1020b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 102161e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 102261e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 102383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 102483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 102583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 102683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 1027c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 1028c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 1029c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1030b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 1031b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 1032b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 1033c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 1034c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 1035c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 103683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 103783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 103883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 103983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1040c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 104183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 1042c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 104361e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 104469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 1045f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 1049b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1050b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1052b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1053b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1054b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1055b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1056b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1057b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 105961e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1060b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1061b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1063b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1064c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1066c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1068c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1069c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 107069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 107147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 107247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 107351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 107451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 107551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 107651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 107751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 107851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 107951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 108051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 108151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 108251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 108351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 108451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 108551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 108651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 108751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10889a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 108983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 109083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 109183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 109283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 109383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 109483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 109583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 109683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 109783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 109883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 109983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 110083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 110183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 110283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 110383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 110483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 110583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 110683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 110783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 110883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 110983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 111083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 111183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 111283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 111383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 111483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 111583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 111683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 111783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 111883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 111983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 112083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 112183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 112283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 112583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 112683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 112783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 112883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 112983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 113083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 113183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 113283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 113383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Val(Info.Ctx, Value, CCValue::GlobalValue()); 113483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 113583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.setFrom(Val); 113683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 11379a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 113883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 113983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 114083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 11419a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 11429a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 11439e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 11441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 11459e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11469e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 11479e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 114883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 11499e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11509e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 115165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 115265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11530dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 115465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 115565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1156e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 11573554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11583554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1159e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1160e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11613554283157190e67918fad4221a5e6faf9317362John McCall return true; 11623554283157190e67918fad4221a5e6faf9317362John McCall } 11633554283157190e67918fad4221a5e6faf9317362John McCall 1164e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11663554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1167e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11680dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11695bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11705bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 117147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 1172c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1173c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1174c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1175c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1176c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 117741bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1178c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1179c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1180a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1181c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1182c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1183c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1184c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1185c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1186c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1187c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1188436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1190e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1191e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1192e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1193e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1194c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1195cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1196180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1197180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 119865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1199c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 12004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 12014efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1202c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1203c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1204c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1205c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1206c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1207c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 120847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1209c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1210c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1211c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 12124efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 12134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1214c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1216c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1218789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1220c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1221c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1223c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1224c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1225c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1226a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1227575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 12281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1229c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1230a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1231c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1232c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1233c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1234c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1235a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1236a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1237c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1238c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1239c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1240c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1241a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1242c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1243c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1244c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1245c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1246c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1247a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1248a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1249f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1250f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1251f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1252f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1253a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1254a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1255a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12569f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1257575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1258a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1259a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1260a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1261c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1262c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1263c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1264c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1265c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1266c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1267c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1268c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1269c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1270a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1271a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1272e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1273e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1274e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1275e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1276e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1277e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1278e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1279e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1280e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1281e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1282e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1283e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1284e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1285e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1286e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1287e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1288e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1289e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1290e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1291e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1292e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1293e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1294e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1295e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1296e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1297e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1298e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1299e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1300e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1301e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1302e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1303e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1304e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1305e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1306e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1307e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1308e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1309e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1310e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1311e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1312e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1313e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1314e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1315e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1316e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1317e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1318e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1320b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1322b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1323b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1325180f47959a066795cc0f409433023af448bb0328Richard Smith 1326b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1328b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1329b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1330b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1331b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1332180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1333180f47959a066795cc0f409433023af448bb0328Richard Smith 1334b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1336e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1337180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1338180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1340180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1341e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1342180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1343180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1344180f47959a066795cc0f409433023af448bb0328Richard Smith } 1345e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1346180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1347180f47959a066795cc0f409433023af448bb0328Richard Smith} 1348180f47959a066795cc0f409433023af448bb0328Richard Smith 1349b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1350180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1351180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1352180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1353180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1354180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1355b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1356180f47959a066795cc0f409433023af448bb0328Richard Smith} 1357180f47959a066795cc0f409433023af448bb0328Richard Smith 1358b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1359180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1360180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1361180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1362180f47959a066795cc0f409433023af448bb0328Richard Smith 1363180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1364b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1365180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1366180f47959a066795cc0f409433023af448bb0328Richard Smith } 1367180f47959a066795cc0f409433023af448bb0328Richard Smith 1368b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1369b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1370b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1371b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1372180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1373b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1374b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1375180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1376180f47959a066795cc0f409433023af448bb0328Richard Smith 1377b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1378180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1379180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1380b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1381180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1382180f47959a066795cc0f409433023af448bb0328Richard Smith} 1383180f47959a066795cc0f409433023af448bb0328Richard Smith 1384180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1385180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1386b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1387180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1388180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1389180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1390180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1391180f47959a066795cc0f409433023af448bb0328Richard Smith 1392180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1393180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1394b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1395180f47959a066795cc0f409433023af448bb0328Richard Smith} 1396180f47959a066795cc0f409433023af448bb0328Richard Smith 1397d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1398d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1399d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1400d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1401d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1402d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1403d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1404d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1405d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1406180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 140774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 140874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1409180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1410180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1411180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1412180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1413180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1414180f47959a066795cc0f409433023af448bb0328Richard Smith } 1415180f47959a066795cc0f409433023af448bb0328Richard Smith 1416180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1417180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 141874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 141974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1420180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1421180f47959a066795cc0f409433023af448bb0328Richard Smith } 1422180f47959a066795cc0f409433023af448bb0328Richard Smith 1423180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1424180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1425180f47959a066795cc0f409433023af448bb0328Richard Smith} 1426180f47959a066795cc0f409433023af448bb0328Richard Smith 1427180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1428180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1429b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1430180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1431180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1432180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1433b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1434b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1435b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1436180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 143774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1438180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1439180f47959a066795cc0f409433023af448bb0328Richard Smith 1440180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1441180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1442b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1443180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1444180f47959a066795cc0f409433023af448bb0328Richard Smith} 1445180f47959a066795cc0f409433023af448bb0328Richard Smith 144686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 144786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 144886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 144986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 145086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 145186024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 145286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 145386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 145486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 145586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 145686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 145786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 145886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 145986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 146086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 146186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 146286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 146386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 146403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1465f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1466f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1467177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1468d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1469d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1470d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1471745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1472745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1473745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1474745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1475f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1476dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1477177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1478f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1479177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1480177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1481d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 148203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1483099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1484099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1485099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1486745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1487745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1488745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1489745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1490099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1491099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1492099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1493180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1494180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1495180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1496b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1497b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1498180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1499180f47959a066795cc0f409433023af448bb0328Richard Smith } 1500180f47959a066795cc0f409433023af448bb0328Richard Smith 150165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 150265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1504dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 150565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1506f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 150765ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1510099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1511099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1512099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1513099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1514099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1515099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 151647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1517099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1518099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1519099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1520099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1521099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1522f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 152303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1524b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 152547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 152603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 152703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1528c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 152903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 153003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 153103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 153203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 153359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 153459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 153559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 153659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 153759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 153859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 153959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 154059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 154159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 154259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 154359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 154459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 154559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 154659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 154759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1548f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith/// Extract the value of a character from a string literal. 1549f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1550f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith uint64_t Index) { 1551f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1552f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1553f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1554f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1555f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1556f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Lit->getType()->getArrayElementTypeNoTypeQual()->isUnsignedIntegerType()); 1557f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1558f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1559f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1560f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1561f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1562cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1563f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1564f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1565cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1568cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1571aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1572aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1575f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1576cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1577745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1578745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1579745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1580cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1581cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1582180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1583cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1584cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1585180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1586cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1588cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1593aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1594aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1595cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1597f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1598f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1599f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1600f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1601f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 1602f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Obj = CCValue(ExtractStringLiteralCharacter( 1603f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Info, O->getLValueBase().get<const Expr*>(), Index)); 1604f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1605f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1606cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1607cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1608cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1609cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 161086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 161186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 161286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 161386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 161486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 161586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 161686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 161786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 161886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 161986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 162086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 162186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Obj = CCValue(Index ? O->getComplexIntImag() 162286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 162386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 162486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 162586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Obj = CCValue(Index ? O->getComplexFloatImag() 162686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 162786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 162886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1629180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1630b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 1631b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_mutable, 1) 1632b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1633b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1634b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1635b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1636b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1637180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1638180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1639180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1640180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1641180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 16437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 16447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 16457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1646180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1647f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1648180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1649180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1650180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1651180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 16577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 16617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16627098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1664cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1665180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 166659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 166759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 166859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 166959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1670cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1671180f47959a066795cc0f409433023af448bb0328Richard Smith 1672f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1673745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1674745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1675180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1676f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1677cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1678cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1679b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1680cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1681cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1682cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 169186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 169286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1696f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1697f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 169886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 169986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 170086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 170186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1704f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1705f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1706f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1707f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1708f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1709f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1710f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1711f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1712f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1713f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1714f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1715f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1716f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1717f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1718f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1719f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1720f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1721f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1722f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1723f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1724f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1725f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1726f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1727f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1728f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1729f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1730f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1731f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1732f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1733f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1734f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1735f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1736f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1737f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1738f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1739f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1740180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1741180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1742180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1743180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1744180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1745f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1746f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17479ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17489ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1749180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1750180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1751f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1752f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1753cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 17547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 17557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 17567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 17577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1758b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1761b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 17637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1764c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1765f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1766f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 17687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17697098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 177183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 177283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 177383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 177483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 177583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 177683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 177783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 177883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 177983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 178083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1790c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1791f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1792c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17931bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1794c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1795c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1796d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1797d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1798c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1799c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1800f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const VarDecl *VDef = VD->getDefinition()) 1801f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1802f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 18037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1805f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1806f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 18077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 18087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 18091bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 18107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 18117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 18137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18147098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1816f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 18207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 18217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 18227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 18237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 18247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 18257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 18277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 18347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 18357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 18367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 18377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 18387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 18427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 18457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 18467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18530a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1855f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1857c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 185847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1859f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1860c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1861c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1862c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1863c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1864c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1865c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18670a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18681bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 186983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 187083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 187183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 187283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 187383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 187483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 187583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 187683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 187783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 187883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 187983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1880c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1881c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1893177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1894cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1895cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1896177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1897cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1898cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1899cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1900cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1901cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1902c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1903cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1904cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1905f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1906f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1907f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1908f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1909f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith RVal = CCValue(Info.Ctx, 1910f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0), 1911f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith CCValue::GlobalValue()); 1912f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1913dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1914cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1915f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1916c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1917f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1918f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 192159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 192259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 192359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 192459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 192559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 192659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 192759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 192859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 192959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1953745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1954745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1964e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1966745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1967745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1968745f5147e065900267c85a5568785a1991d4838fRichard Smith 1969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1970e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1973b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1981e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1987b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1988b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1989b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1990e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1991e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 2000e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 2001e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 2002e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 2003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 2004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 2005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 2006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 2008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 2009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 2012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 2013d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 2014d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 2015d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 2016d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 2017d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 2018d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2019d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 2020e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2021e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2022e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 2023e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2024e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2025e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 2026e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 2027e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 2028e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 2029e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 2030b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 2031e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2032e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2033e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 2034e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 2035e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 2036b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2037b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 2038b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 2039b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 2040b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2041b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 2042b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2043b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2044b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 2045b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 2046b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 2047e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 2048e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2049b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2050b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2052e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2053b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 2054b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 2055b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2056e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2057b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2058e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2059e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2060b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 206159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 206259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2063c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2064d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2065d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2066d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2067d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2068d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2069d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2070d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2071d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2072d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2073d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2074d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 207583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic EvalStmtResult EvaluateStmt(CCValue &Result, EvalInfo &Info, 2076d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2077d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2078d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2079d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2080d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2081d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2082d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2083d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2084d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2085c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 208783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2088c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2089c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2090c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2091d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2092d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2093d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2094d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2095d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2096d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2097d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2098d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2099d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2100d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2101d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2102d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2103d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2104d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 21056180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 21066180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 21076180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 21086180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 21096180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 211051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 211151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 21126180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 21136180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 21146180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 21154c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 21164c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 21174c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 21184c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 21196180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 21204c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 21214c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 21224c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 21234c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 21244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 21256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 21266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 21276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21296180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 21306180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 21316180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2132c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2133c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2134c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2135c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2136c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2137745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2138745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2139745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2140745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2141745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2142745f5147e065900267c85a5568785a1991d4838fRichard Smith 2143c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2144c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2145c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2146c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2147c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2148c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2149099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2150099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2151c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2152c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2153c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2154c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2155c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2156c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2157c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2158c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2159c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2160c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2161180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 2162cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 2163180f47959a066795cc0f409433023af448bb0328Richard Smith} 2164180f47959a066795cc0f409433023af448bb0328Richard Smith 2165180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2166180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2167180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2168745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2169180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2170745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2171745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2172745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2173745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2174745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2175745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2176745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2177745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2178745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2179745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2180180f47959a066795cc0f409433023af448bb0328Richard Smith} 2181180f47959a066795cc0f409433023af448bb0328Richard Smith 2182d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2183745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2184745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2185f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 218683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EvalInfo &Info, CCValue &Result) { 2187180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2188180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2189180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2190d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2191745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2192745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2193745f5147e065900267c85a5568785a1991d4838fRichard Smith 2194745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2195d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2196d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2197d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2198180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2199745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 220059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2201180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 220251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2203180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2204180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2205180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2206180f47959a066795cc0f409433023af448bb0328Richard Smith 2207745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2208745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2209745f5147e065900267c85a5568785a1991d4838fRichard Smith 221086c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 221186c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 221286c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 221386c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 221486c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 221586c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2216745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2217180f47959a066795cc0f409433023af448bb0328Richard Smith 2218180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2219180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2220180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 222183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2222180f47959a066795cc0f409433023af448bb0328Richard Smith } 2223180f47959a066795cc0f409433023af448bb0328Richard Smith 2224610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2225610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2226610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2227610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2228610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 2229610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 2230610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 2231610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 2232610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 2233745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 2234745f5147e065900267c85a5568785a1991d4838fRichard Smith RHS, Value)) 2235745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2236745f5147e065900267c85a5568785a1991d4838fRichard Smith assert((Value.isStruct() || Value.isUnion()) && 2237745f5147e065900267c85a5568785a1991d4838fRichard Smith "trivial copy/move from non-class type?"); 2238745f5147e065900267c85a5568785a1991d4838fRichard Smith // Any CCValue of class type must already be a constant expression. 2239745f5147e065900267c85a5568785a1991d4838fRichard Smith Result = Value; 2240745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 2241610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2242610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2243610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 224451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2245180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2246180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2247180f47959a066795cc0f409433023af448bb0328Richard Smith 2248180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2249180f47959a066795cc0f409433023af448bb0328Richard Smith 2250745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2251180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2252180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2253180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2254180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2255180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2256180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2257745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2258745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2259745f5147e065900267c85a5568785a1991d4838fRichard Smith 2260745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2261180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2262180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2263180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2264180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 226586c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2266180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2267180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2268180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2269180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2270180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2271b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2272180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2273745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2274180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2276180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2277180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2278745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2279745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2280745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2281745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2282d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2283d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2284d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2285d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2286d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2287d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2288d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2289d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2290d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2291d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2292d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2293d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2294d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2295d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2296d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2297d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2298d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2299d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2300d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2301d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2302d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2303745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2304d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2305d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2306d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2307d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2308d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2309180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2310d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2311180f47959a066795cc0f409433023af448bb0328Richard Smith } 2312745f5147e065900267c85a5568785a1991d4838fRichard Smith 231383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 231483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2315745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2316745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2317745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2318745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2319745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2320745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2321745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2322180f47959a066795cc0f409433023af448bb0328Richard Smith } 2323180f47959a066795cc0f409433023af448bb0328Richard Smith 2324745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2325180f47959a066795cc0f409433023af448bb0328Richard Smith} 2326180f47959a066795cc0f409433023af448bb0328Richard Smith 2327d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2328770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 23298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 23301e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2331c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2332c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23331e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2334c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2335c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 23368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2337c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2338c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2339c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 23418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2342f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2343f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 23448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 23451e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2346c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2347c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2348c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2349f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 23501e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2351f85e193739c953358c865005855253af4f68a497John McCall return true; 2352f85e193739c953358c865005855253af4f68a497John McCall return false; 2353f85e193739c953358c865005855253af4f68a497John McCall } 2354f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 23551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2356f85e193739c953358c865005855253af4f68a497John McCall return true; 2357f85e193739c953358c865005855253af4f68a497John McCall return false; 2358f85e193739c953358c865005855253af4f68a497John McCall } 2359f85e193739c953358c865005855253af4f68a497John McCall 2360c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2361c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 23628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 23638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 23648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2365c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 23668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 23678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 23688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 23698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 23708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 23718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2372f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2374980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 23761e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 23778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 23788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2381980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 23838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 23858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 23868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 23871e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2388c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2389980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2390c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2392363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2393363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2395363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2396363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23984423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2399363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2400363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2401ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 24028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2403c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2404c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 240556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 240656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 240756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 240856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 240956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 241056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 241156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 241256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 241356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 241456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 24151e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 241656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 241756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 241856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 241956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 242056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 242156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 242256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 242356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 242474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: For a recursive constexpr call, an outer stack frame might have 242574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // been using this opaque value too, and will now have to re-evaluate the 242674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // source expression. 242756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 242856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 242956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 243056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2431c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2432c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 24334efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 24348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 24358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 24368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 24378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2438f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2439f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 24408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 24418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 24428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 244347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 24448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 24458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 244651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 244751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2448f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 24498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 245074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 245174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 245274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 245374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 245474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 245574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 245674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 245774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 245874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 245974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 246074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 246174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 246274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 246374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 246474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 246574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 246674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 246774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 246874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 246974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 247074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 247174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 247374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 247474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 247774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 247874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 247974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 248074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 248174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 248274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 248374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 248474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 248574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 248674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 248774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 248874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 24898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 24908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 24918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 24928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 24938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2494dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2495d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2500f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2501dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2505f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2506f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2507f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 250851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2509f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 25108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 25118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 25128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2514b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 25158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2517f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 25188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 25218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 25238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 25258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 25278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 25288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 25298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 253091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 253191a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 25323d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 25333d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2534bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2535bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2536bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2537bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 25388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2539c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2540c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2541c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2542c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2543c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2544c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2545c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2546c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2547c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2548e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2549e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2550e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2551f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2552e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2553e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2554e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2555e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2556e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2557e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2558e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2559e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2560e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2561e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2562e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2563f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2564e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2565e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2566e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2567e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2568e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2569e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 25708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 257174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Cache the value of the common expression. 25728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 25738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2574f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 25758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 257674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 25778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2580f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2581f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2582f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2583f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2584f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2585f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2586f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2587f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2588f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2589f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2590f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2591f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2592f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2593f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2594f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2595f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2596f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 259774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2598f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2599f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2600f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2601f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2602f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2603f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 26048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 26058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 260747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 260842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 260942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 261042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 261242786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 261342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 261542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 261642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 261742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 261847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 26198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2620f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2621d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2622e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2623d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2624d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 26256142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 262659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 262759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 262886c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 262959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 263059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 263159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2632f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2636f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2637f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 263986c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2640e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2641e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2644e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2647f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2648f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2649f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2650f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 265159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2652b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2653b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2654f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 265559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2656b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2657f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 26581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 26591bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 266059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2661f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 266259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 266359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 266459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 266559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 266659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2667f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2668f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2669f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2670f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2671f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2672f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 267359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 267459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 267559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 267659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 267759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2678d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 267959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 268059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2681f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 268259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2683f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2684d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2685b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2686b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2687b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 268886c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 268986c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 269086c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 269186c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 269286c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 269386c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2694c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2695d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 269683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Result; 2697d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2698c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2699745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2700745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2701f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2702d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 270383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2704d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2705d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2706c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2707c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2708c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2709f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 271071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 271171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 271271523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 271371523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2714f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2715f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2716f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 271751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2718f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2719f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 272051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2721f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 272351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2725f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2726180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2727180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2728180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2729180f47959a066795cc0f409433023af448bb0328Richard Smith 2730180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2731180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2732180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2733180f47959a066795cc0f409433023af448bb0328Richard Smith 2734180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2735180f47959a066795cc0f409433023af448bb0328Richard Smith 2736180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2737f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2738180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2739180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2740180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2741180f47959a066795cc0f409433023af448bb0328Richard Smith 2742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2744180f47959a066795cc0f409433023af448bb0328Richard Smith 2745f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2746180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2747180f47959a066795cc0f409433023af448bb0328Richard Smith } 2748180f47959a066795cc0f409433023af448bb0328Richard Smith 2749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2750c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2751c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2752c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2753c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27547a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 27557a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2756c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 27577d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2758c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2759c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2760c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2761c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2762f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2763f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2764f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 27659ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 27669ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 27679ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2768f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2769f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2770c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2771c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2772c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2773f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2774c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2775c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27768327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 27778327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 277847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 27798327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 27808327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 27818327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 27828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 27838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 27858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2819c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2820af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2821c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2822c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2823c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2830d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2831d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2832d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2833d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2834d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2835d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2836d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2837d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2838d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2839d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2841d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 2842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2843d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2878b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 28924efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2893c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2894c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2895c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2896c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2897c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2898c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2899c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 29001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 29011bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 29021bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 29031bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2904c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2905c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 290647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2907c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2908180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2910c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2911c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2912c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 29131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 291483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 291583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 29161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 29174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 29184efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2919770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 29214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 29241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2925c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2926c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 29288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2929bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 29308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 29318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 29328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 29338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 293447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 29358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 29368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 293786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 293886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 29398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 29408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 294126bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 294226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 294426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2945db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2946c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 29470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 29480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 29490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 29500a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2951db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2953180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2954180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 295626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 295726bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 29584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 29594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 29604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2961c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2962c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2963c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2964c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2965c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2966efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2967c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2968c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2969c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 29708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 29714efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 29741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 29751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 29761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2977c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2978c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2979c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2980436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2982177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2983177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 298483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2985177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2986177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 29871bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2988177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 298950c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 299047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2991f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2992f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2993f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 299435873c49adad211ff466e34342a52665742794f5Anders Carlsson} 299535873c49adad211ff466e34342a52665742794f5Anders Carlsson 2996bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2997bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2999af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 3000e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 3001e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 300283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 300383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 300483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 3005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 3008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 3009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 3010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 3011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3012f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 3013e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 3014e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 301583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 3016e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3017bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 3018bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 30198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 30208cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 3021c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 3022c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 3023c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 3024efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 30254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30264efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 302747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 302847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 302947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 303047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 303147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 303247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 303347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 303447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 303547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 303647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 303747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 303847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 303947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 30408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 3041c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 3042c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 3043c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3044c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 3045c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 3046c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 3047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 3048d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 3049d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 3050d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 30511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 3052d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 3053d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 3054d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 3055180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 3056e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 30574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 3060c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 3061c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 3062f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3063c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 30643068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 3065efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30673068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 30683068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 3069efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3070180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 3071180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 3072180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 30733068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 3074b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 30753068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 30764efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 3078efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 3079e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 3080e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 308186024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 308286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 308386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 308486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 308586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 308686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 308786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 308886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 308986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 309086024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 309186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 309286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 309386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 309486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 309586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 309686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 309786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 309886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 30994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 3100f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 3101f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3102f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3103c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 3104770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 31058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 3106efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 3107efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 31088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 31091bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 3110efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3111efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 31122bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 31131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3114efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 31158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 3116f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 311747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 31188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 31198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 31202bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 312151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3122f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 3123f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 31242bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3125efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 31268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3127efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 31288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3129efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 31308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3131efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 31328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 31338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3134469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3135efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3137b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3138180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3139180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3140f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3141180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3142180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3143180f47959a066795cc0f409433023af448bb0328Richard Smith } 314456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3145ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 31462bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3147f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 31482bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3149efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 31518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3152f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3153650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3154efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 31552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 31562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3157e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 31581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3159650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3160650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3161650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3162f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 31631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3164745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3165745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3166efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 31671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3168efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3169745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3170efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3171efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3172efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3173efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 31740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 31750a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3176650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3177180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3178b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3179b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3180650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 31814efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3182efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3183efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 31844efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 31851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 31878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3188650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 318909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 319009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 319109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 319209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31932de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 31941d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 31951d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 31962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 319728c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 319828c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3199c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3200c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3201c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 32024cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 320328c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 32044cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 32054cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 32064cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 32074cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 32084cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 32094cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 32100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 321109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 32125c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 32135c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 321447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 32155c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3216e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3217e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 32185c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3219180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 32205c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3221180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3222180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 32235c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3224180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 32255c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 32285c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3229180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 32305c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 32315c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 32325c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 32335c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 32345c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 324247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 324351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3244404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 32452de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3246c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3247c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 324847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 3249efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 325009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 325169ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3252efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 325347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 325447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 32551bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 325647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 325783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 32580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3259efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3260efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3261efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 326247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 3263efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3264650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3265650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 32662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 327183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 327283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 327383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3274e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3275e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 32760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3280b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3281b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 32820a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 32836a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 32842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 32856a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 32864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 32874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3288c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 32891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3290650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 32918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3292180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3293efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 329456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 32958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 32964efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3297f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3298f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3302e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3303e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3304e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3305e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3307e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3308e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3311e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3314e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3316e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 3317e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3318e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3319e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 332051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3321e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3322e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3323e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3326e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3327e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3328e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3329e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3330e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3336e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3337e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3338e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3340e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 334151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3342e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3343e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3344e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3345e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3346e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3347e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3348e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3349e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3350e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3351e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3352e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3353e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3354e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3355e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3356e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3357f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3358e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3359e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3360e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3361f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3362e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3363e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3364e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3365e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3366e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3367e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3368e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3369e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3370e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3371e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3372e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3374e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3375e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3376e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3377e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3378e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3379e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3380e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3381e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3382e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3383e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3384e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3385e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3386180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3387180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3388180f47959a066795cc0f409433023af448bb0328Richard Smith 3389180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3390180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3391180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3392180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3393180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3394180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3395180f47959a066795cc0f409433023af448bb0328Richard Smith 3396180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3397180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3398180f47959a066795cc0f409433023af448bb0328Richard Smith 3399180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 340083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 340183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3402180f47959a066795cc0f409433023af448bb0328Richard Smith } 340351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3404180f47959a066795cc0f409433023af448bb0328Richard Smith 340559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3406180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3407180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3408180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3409180f47959a066795cc0f409433023af448bb0328Richard Smith} 3410180f47959a066795cc0f409433023af448bb0328Richard Smith 341151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 341251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 341351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 341451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 341551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 341651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 341751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3418b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3419b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 342051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 342151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 342251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 342351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 342451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 342551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 342751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 342951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 343051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3431b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 343251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 343351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3434b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3435b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 343651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 343751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 343851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 343951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 344051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3441b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3442b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 344351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 344451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 344551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 344651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 344751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3448b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 344951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 345051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 345183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 345251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 345351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 345451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 345551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 345651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 345751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 345851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 345951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 346051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 346151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 346251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 346351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 346451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 346551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 346651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 346751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 346851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 346951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 347051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3471b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 347251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 347351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 347483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 347551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 347651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3477ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 3478ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_virtual_base) << RD; 3479ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3480ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3481ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3482b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 348351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 348451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 348559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 348659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 348759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 348859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 348959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 349059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 349159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 349259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 349359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 349459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 349559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 3496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 349759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 350059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 350159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 350259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 350359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 350459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 350559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 350659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 350759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 350859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 350959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 351059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 351159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 351259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 351359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 351459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 351559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 351659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3517180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 351824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 351924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 352024fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 352124fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3522180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3523180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3524180f47959a066795cc0f409433023af448bb0328Richard Smith 3525180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3526ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3527ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3528ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3529180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3530ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3531ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3532ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3533ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3534ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3535ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3536180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3537ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 353883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3539180f47959a066795cc0f409433023af448bb0328Richard Smith } 3540180f47959a066795cc0f409433023af448bb0328Richard Smith 3541180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3542180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3543180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3544180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3545180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3546745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3547180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3548180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3549180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3550180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3551180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3552180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3553180f47959a066795cc0f409433023af448bb0328Richard Smith 3554180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3555180f47959a066795cc0f409433023af448bb0328Richard Smith 3556745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3557745f5147e065900267c85a5568785a1991d4838fRichard Smith 3558745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3559745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3560745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3561745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3562745f5147e065900267c85a5568785a1991d4838fRichard Smith 3563745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3564745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3565745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3566745f5147e065900267c85a5568785a1991d4838fRichard Smith 356783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3568745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3569745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3570745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3571180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3572745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3573180f47959a066795cc0f409433023af448bb0328Richard Smith } 3574180f47959a066795cc0f409433023af448bb0328Richard Smith } 3575180f47959a066795cc0f409433023af448bb0328Richard Smith 3576745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3577180f47959a066795cc0f409433023af448bb0328Richard Smith} 3578180f47959a066795cc0f409433023af448bb0328Richard Smith 3579180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3580180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 358151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 358251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3583ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3584ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3585ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3586ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 358751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 358851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 358951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 35906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 35916180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 35926180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 35936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 35946180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 35956180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 35966180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 35976180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 35986180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3599180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3600180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3601180f47959a066795cc0f409433023af448bb0328Richard Smith 3602c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3603c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3604180f47959a066795cc0f409433023af448bb0328Richard Smith 3605610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 360651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3607180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3608180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3609180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3610180f47959a066795cc0f409433023af448bb0328Richard Smith 361151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 361251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 361351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3614180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3615745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3617f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3618180f47959a066795cc0f409433023af448bb0328Richard Smith} 3619180f47959a066795cc0f409433023af448bb0328Richard Smith 3620180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3621180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3622180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3623180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3624180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3625180f47959a066795cc0f409433023af448bb0328Richard Smith} 3626180f47959a066795cc0f409433023af448bb0328Richard Smith 3627180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3628e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3630e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3631e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3632e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3637e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3639e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3640e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3641e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3642e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 364383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 364483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3648e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3670af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 367559b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 367659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 367759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 367859b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3679770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 368007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 368107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 368259b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 36831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 368407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 368507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 36861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 368707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 368807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 368907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 369007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 369107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 369207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 369369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 369469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 369507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 369607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 369707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 369851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 36991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 370007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 370191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 370207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 370307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 370407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 370591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 37062217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 370791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 370859b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 370959b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 371059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 371159b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3712c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 371307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 371459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 371559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 371607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 371707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3718c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 37191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3720d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3721e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 372259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 372346a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 372446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 372507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 372646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 372746a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 372846a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3729f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 373007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 373146a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 373246a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 373346a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3734f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 373507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 373646a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 373707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 373846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3739c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3740c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 374107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 374207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3743e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3744e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3745e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3746e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3747e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3748e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3749e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3750e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3751e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3752e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3753e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3754e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3755e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3756e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3757e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3758e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3759e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3760e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3761e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3762e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3763e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3764e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3765e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3766e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3767e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3768e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3769e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3770e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3771e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3772e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3773e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3774e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3775e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3776e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3777e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3778e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3779e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3780e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3781e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 378246a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3783c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3784c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 378559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 378659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 378707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 378859b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 378907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 379059b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 379191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 37921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 379359b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 37945f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 379559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 37963edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 37973edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 37983edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 37993edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 38003edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 38013edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 38023edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 38033edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 38043edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 38053edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 38063edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 38073edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38083edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 38093edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 38103edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 38113edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 38123edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 381359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 38143edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 38153edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 38163edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38173edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 38183edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 38193edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 38203edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 382159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 382259b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 38233edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 38243edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 38253edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38263edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 38273edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 38283edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 38293edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 383059b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 38313edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 383259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 383307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 383459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 383559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 383607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 383751201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 383807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 383991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 384091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 384191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 384291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 384391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 384491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 384591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 384691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 38475f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 384807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 384991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 385091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 385107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 38528327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 385351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 385491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 385591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 385659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3857cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3858cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3859cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3860cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3861cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3862cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3863180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3864cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3866cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3867180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3868180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3869cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3870cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3871f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3872f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3873cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3874cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3875cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3876cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 387751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3878180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3879180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3880180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3881f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3882180f47959a066795cc0f409433023af448bb0328Richard Smith 3883180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3884180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3885180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3886180f47959a066795cc0f409433023af448bb0328Richard Smith 388751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3888180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3889b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3890180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 389183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3892180f47959a066795cc0f409433023af448bb0328Richard Smith } 3893180f47959a066795cc0f409433023af448bb0328Richard Smith 3894cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3896cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3897cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3898cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3899180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3900180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 390151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3902180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3903cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3904cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3905cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3906cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3907cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3908f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3909cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3910974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3911974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3912ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3913974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3914974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3915974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3916974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3917f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith CCValue Val; 3918f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3919f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3920974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3921974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3922745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3923745f5147e065900267c85a5568785a1991d4838fRichard Smith 3924cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3925cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3926180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3927b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3928180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3929cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3930180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 393183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 393283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3933745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3934745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3935745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3936745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3937745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3938745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3939180f47959a066795cc0f409433023af448bb0328Richard Smith } 3940cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3941745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3942cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3943180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3944180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3945180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3946180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 394783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 394883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3949cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3950cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3954f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3956ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3957ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3958ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 39636180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 396451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 396551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3966ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3967ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3968ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 396951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 397051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3971b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 397251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 397383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 397451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 397551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 39766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 39776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 39786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 39796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 39806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 39816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 39826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 39836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 39846180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 39856180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3987e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3988e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3989c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3990c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3991e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3997b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 399851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3999ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 400051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 400183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 400251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 400351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 400451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 4005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 4006745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 4007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 4008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 4009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 4010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 4011cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 4012f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 4013c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 4014c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 4015c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 4016c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 4017f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 4018f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4019f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 4020770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 40218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 402247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 4023f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 402447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 40258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 4026f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4027973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 4028973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 40292ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 4030973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 40313f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 4032973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 40333f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 403447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 40353f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 40363f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 40373f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 4038131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 40392ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 40402ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 404130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 40423f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 404347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 4044575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 4045575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 4046131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 4047131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4048131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4049131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 40502ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 40512ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 405247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 4053131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 4054131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4055131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 40564f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 40574f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 40584f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 40594f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 406047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 40615930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 4062342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 4063342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 4064342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 40658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 406632fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 40671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 406851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 4069f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 40708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 40718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 40728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 4073f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40744c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 4075131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40764c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 40774c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 4078131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40794c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 4080043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 4081043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 4082043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 40838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 40848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 40858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4087043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4088043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4089043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4090c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4091043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4092043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4095043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4096043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4098b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40998ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4100b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4101f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 41028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4103f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 41040518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 41053068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4106131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 41073068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 41081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4109f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 41103f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 411151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4112664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4113664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 411464b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 41150dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 411664b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 411764b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 41186ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 41196ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 41206ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 41216ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 412221ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 412321ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 412421ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 412521ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4126552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4127552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4128552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4129552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4130722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4131664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4132664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4133295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4134ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4135cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4136fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 41378b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 41388b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 41391bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 41408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4141664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4142f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4143f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4144f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4145c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4146c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4149c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4151c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4152c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 4153f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 415447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4155c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 41568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 415769ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 415869ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4159f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 416047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 4161f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4162f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4163f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4164f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4165f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 4166dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 416730c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4168f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 416930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 417030c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4171f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4172f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4173f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4174f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4175f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4176043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 41774c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4178bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4179973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4180973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4181973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4182973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4183973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4184973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4185973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4186973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4187973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4188973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4189973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4190973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4191973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4192973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4193973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4194973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4195973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4196bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41984c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41994c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4200a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4201a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4202a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4203a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 42047c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4205a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4206a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4207a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4208a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4209a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4210a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4211a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4212a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4213a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4214a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4215a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 42161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 42171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4218a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4219a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4220a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 42211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4222a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4223a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4224a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4225a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4226a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4227a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4228a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4229a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4230a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4231a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4232a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4233a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4234a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4235a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4236a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4237a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4238a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4239a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4240a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4241a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4242a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4243fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4244a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4245a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4246a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4247a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4248a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4249a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4250a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4251a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4252b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4253a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4254a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 425580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 425680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 425780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 425880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 425980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 426080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 426180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 426280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 426380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 426480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 426580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 426680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 426780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 426880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 426980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 427080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 427180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 427280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 427380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 427480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 427580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 427680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 427780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 427880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 427980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 428080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 428180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 428280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 428380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 428480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 428580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 428680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 428780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 428880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 428980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 429080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 429180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 429280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 429380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 429480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 429580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 429680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 429780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 429880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 429980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 430080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 430180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 430280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 430380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 430480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 430580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 430680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 430780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 430880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 430980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 431042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 431142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 43121bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 43131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 43141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 431542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 43161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 43171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 43181bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 431942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 432042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 432142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 432242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 432342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 432542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 432642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 432742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 432842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 432942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 433042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 43311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 433242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 433442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 433542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 43361357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 433742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 433842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4339f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 434042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 434142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 434242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 434342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 434442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 434542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 434642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 434742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 43484f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 434942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 435042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4352180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4353019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 43548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 435564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 435664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 435742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 435842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 435964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4360b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4361b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4362393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4363a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4364cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 436564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 436664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4367c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4368f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 436964eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 437064eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4371019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4372131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 437480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 437580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4376e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 437721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4378a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4379bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 438021fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 438121fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4382c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4383c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4384c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 438540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43865726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 438740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 438840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 438940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 439040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 439140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 439240b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 439340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43945726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43955726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43965726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43985726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43995726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 44005726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 44015f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 44025f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 44035f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 44045726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 44055726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 44065726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 44075726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 44085726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4409f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4410454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4411454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4412454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4413454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4414454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4415454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4416454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4417454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4418454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4419454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4420454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4421454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4422454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4423454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4424454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4425454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4426454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4427454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4428454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4429454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4430454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4431454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4432454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4433f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4434454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4435454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4436454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4437454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4438454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4439454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4440454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4441454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4442454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4443454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4444454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4445454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4446454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4447454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4448454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4449454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4450454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4451454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4452f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4453454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4454019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 44554c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4456f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4457625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4458625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4459625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4460625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4461625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4462625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4465625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4466625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4467625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4468625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4470625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4471625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4472625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4473625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 447483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4475625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4476625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44777b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44807b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44827b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44837b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44847b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44857b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44867b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44877b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44887b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44897b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44907b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44917b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44927b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44937b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4494b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4495c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4497c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 44982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 44998327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 45008327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4501a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4502a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4503a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 4504a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 450574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // necessarily integral nor evaluated. 4506fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 45071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4508c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 450951fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 451051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 45112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 45123f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4513a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4514c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 45152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4516131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 45174bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4518131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 45194bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 45204bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 452174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Since we weren't able to evaluate the left hand side, it 452274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // must have had side effects. 452374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.HasSideEffects = true; 452474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 452574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Suppress diagnostics from this arm. 452674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculative(Info); 4527c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 45284bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 45294bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 453074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) 4531131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 45324bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4533a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4534a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4535a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4536c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 453754176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4538286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4539286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 45404087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45414087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 45424087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4543f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 45444087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4545745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4546745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 45474087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45484087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4549745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 45504087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45514087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45524087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 45531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 45544087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 45551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 45564087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 45574087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4559131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4560131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4561131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4563131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 45641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4565fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4566fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 45671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4568fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4569fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4570131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45714087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 45722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4573131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4574131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4575131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4577131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4578131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4579131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4580131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45814087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45824087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4584286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4585286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4586286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 45871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4588745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4589745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4590286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4592745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4593286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4595286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4596529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4597286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4598286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4599b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 46002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4601131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 46022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4603131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 46042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4605131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 46062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 46071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4608131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 46092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4610131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 46112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 46121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4613fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4614fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4615286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4616286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 46171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4618ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4619625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4620745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4621745f5147e065900267c85a5568785a1991d4838fRichard Smith 4622745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4623745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 46243068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4625a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4626745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 46273068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4628a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4629625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4630625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4631625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 463265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 463365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 463465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 463565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 463665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 463765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 463865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 463965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 464065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 464165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 464265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 464365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 46445930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 46455930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 46465930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 46475930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 464865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 464965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 465065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 46519e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 46529e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 46535bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4654f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4655ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4656ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4657c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4658ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4659ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4660f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46619e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4662b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4663b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4664b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 466574f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 466674f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4667f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46689e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 46699e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 46709e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4671f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46729e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4673c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4674c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4675c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 46769e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 46775bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4678a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 467915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 468015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 468115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46954992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 46964992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 46973068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4698180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 469974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 4700180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4701a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 470215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 470315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 470415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 470515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 470615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 470715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 470815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 470915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 471015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 471115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 471215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 471315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 471415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 471515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 471615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 471715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 471815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 471915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 472015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 472115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4722ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4723625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 472482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 472582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 472682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 472782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 472882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 472982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 473082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 473182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4732f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 473382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 473482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4735f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4736f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4737f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4738f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4739f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4740f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4741f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4742f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4743f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4744f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4745f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4746f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4747f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4748f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4749f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4750f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4751f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4752f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4753f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4754f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4755f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4756f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4757f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4758f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4759f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4760f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4761f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4762f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4763f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4764f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4765f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4766f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4767f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4768f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4769f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4770f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4771f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4772f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4773f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4774f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4775f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4776f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4777625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4778625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4779625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4780625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4781625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4782625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4783625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4784625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4785ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 47863068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 47873068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4788b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4789b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4790b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4791b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4792b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4793b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4794b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4795b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4796b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4797b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4798b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4799b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4800b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4801b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4802b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4803b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4804b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4805b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4806b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4807b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4808b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4809b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4810b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4811b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4812b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4813b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4814b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4815b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4816b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4817b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4818b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4819b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4820b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4821b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4822b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4823b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4824b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4825b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4826b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 482726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 482826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 482926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 483026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 483126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 483226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 483326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 483426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 483526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 483626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 48372ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 48382ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4841a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4842a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4843a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 484447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4845745f5147e065900267c85a5568785a1991d4838fRichard Smith 4846745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4847745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4848f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4849d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4850745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 485130c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4852745f5147e065900267c85a5568785a1991d4838fRichard Smith 485347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 485442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 485542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4856c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4857a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4858a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 48592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 486047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 486142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 486247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 486347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 486442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 486542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 486642edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 486742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 48682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4869c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 487047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 487147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 487247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 487342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 487442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 487542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 487665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 487765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 487865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 487965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 488065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 488165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 488265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 488365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 488465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 488565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 488665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 488765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 488865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 48895930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 48905930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 48915930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 48925930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 489365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 489465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 489565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 489665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 489742edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4898c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4899f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4900a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4901c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4902c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 490342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4904a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 490532fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4906f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49077b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 49087b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49097b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 49107b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 49117b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 49127b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49137b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 49147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 49157b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 49167b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49177b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 49187b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4921c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 49222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 49233df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 492454176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4925f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 49263df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 49273df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4928789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4929789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4930789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 49313df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 49322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4933789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4934789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4935091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4936789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4937091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4938091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4939091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4940091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4941091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4942789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4943789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4944789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4945789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4946789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4947789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4948789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4949789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4950925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith // operand, and must not overflow the corresponding unsigned type. 4951789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4952789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4953925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith else if (LHS.countLeadingZeros() < SA) 4954925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith CCEDiag(E, diag::note_constexpr_lshift_discards); 4955789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4956789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4957c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 49583f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4960789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4961789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4962091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4963789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4964091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4965091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4966091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4967091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4968091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4969789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4970789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4971789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4972789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4973789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4974789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4975789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4976c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 49773f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4979c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4980c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4982c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4983c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4984c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4985b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4986a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4987a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 49888b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 49895d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 49905d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 49915d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 49925d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 49939f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 49949f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 49959f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 49969f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4997e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4998e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 49998b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 5000af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 5001af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5002af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 50031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 5004af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 50058b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 50068b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5007a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5008af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 50098b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 50108b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5011af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5012e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 5013e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5014e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5015e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5016f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 5017f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 5018f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 5019f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 5020f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 5021f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 5022e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 50234f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 5024e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 50254f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 5026e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 5027a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5028f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 5029f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 50300518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 5031f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 5032f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 5033a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5034f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 5035f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 5036f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5037f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5038f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5039f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5040f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5041f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5042f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5043f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5044f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5045f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5046f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5047f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5048f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5049f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5050f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5051180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 505274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5053f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5054180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5055f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5056f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5057f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5058f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5059fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5060fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 50618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 50628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 50638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 50648ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5065f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 50678ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 50688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 50698ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 50708ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 50718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 50728ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 50738ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 50748ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 50758ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 50768ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5077f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50788ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 50798ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 50808ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 50818ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50828ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50848ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 50858ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 50868ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5087f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5088f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50898ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 50908ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5091ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5092cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5093fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 50948ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 50958ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50968ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5097f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50988ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 50998ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5100f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5101cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5102cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5103cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5104f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5105cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5106cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5107cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5108f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5109f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5110cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 5111cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5112cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5113cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5114cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5115cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5116cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5117f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5118cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5119cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 51207c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5121cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5122cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 51238ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 51248ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 51258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 51268ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 51278ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5128b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 512975a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 51304c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 513175a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 513275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5133f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 51342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 51354c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 51364c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5137f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 51382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5140f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5141f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5142f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5143f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5144f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5145789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5146789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5147789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5148789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5149789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5150f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5151f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5152f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5153f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5154f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5155f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5156f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5157f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5158f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5159f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5160f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5161f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5162f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 516306a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5164a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 51651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5166732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5167732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 51688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 51698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 517082206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5171b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 517282206e267ce6cc709797127616f64672d255b310Anders Carlsson 517346a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 517446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 517546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 517646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 517746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 517846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 517946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 518046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 518146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 518246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 518346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 518446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 51854d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 518646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 518746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 518846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 518946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 519046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 519146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 51921d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 51931d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 519446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 519546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 519646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 519746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 519846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 519946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 520046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 520146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 520246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 520346a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 520446a523285928aa07bf14803178dc04616ac85994Eli Friedman 5205e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 520646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 520746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 520833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 520933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 521033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 521133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5212f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 521346a523285928aa07bf14803178dc04616ac85994Eli Friedman 52147d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 521546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 52167a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 52177a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 521846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5219c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 522046a523285928aa07bf14803178dc04616ac85994Eli Friedman 522146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 522246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 522346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 522446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 522546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 522646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 52274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5228c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 52294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5230131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 52314efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 52324efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 523346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5234732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5235b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5236a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5237be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 523865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 523965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 524065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 524165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 524265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 524365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 524465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5245be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5246be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5247be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 524830c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5249f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5250f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5251732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 52521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 525346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5254c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5255c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5256efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 525787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5258b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 52594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5260dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5261dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5262f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5263f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5264f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5265dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5266f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5267dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5268b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5269efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5270dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5271dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 52724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5273a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5274a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5275f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 52762bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 52774efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 527846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5279f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 52801725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 52811725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 528246a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 52831725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 52842217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 528546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 528646a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 528746a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 528846a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5289732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5290c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5291c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5292c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5293c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 529446a523285928aa07bf14803178dc04616ac85994Eli Friedman } 529546a523285928aa07bf14803178dc04616ac85994Eli Friedman } 52961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 529746a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5298a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 52992bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5300722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5301722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5302f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5303f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5304f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5305f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5306f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5307722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5308722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5309722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5310722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5311722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5312722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5313664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5314722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5315f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5316f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5317f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5318f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5319f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5320722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5321722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5322722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 53238327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5324664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5325664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5326664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5327ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5328ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5329ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5330ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5331295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5332295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5333295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5334295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5335f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5336d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5337d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5338d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5339d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5340770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 53418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5342d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5343d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5344d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 53458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5346d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 534747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 53488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 53498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 53508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5351d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 535251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5353f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5354f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5355f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5356f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5357019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5358d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53595db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5360d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5361d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 53628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 53632217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5364abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5365abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5366ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 536751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5368d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5369d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5370d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5371d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5372c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 53738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5374d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5375d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53764ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5377db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5378db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5379db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5380db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5381db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5382db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5383db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5384db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5385db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5386db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5387db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5388db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5389db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5390db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5391db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5392db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5393db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5394db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5395db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5396db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5397db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5398db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5399db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5400db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5401019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5402180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 54038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 54048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 54058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5406019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5407019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5408019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5409019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5410019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 54117cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 54127cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 54137cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 541434a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 541534a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 54167cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 54171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5418db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5419db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5420db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5421f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5423f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5424f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5425db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 54269e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 54279e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 54289e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 54294572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 54309e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5433f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5434f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 54355db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54365db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 54375db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 54385db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 54395db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 54405db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54425db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 54435db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54445db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54455db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 54471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 54485db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 54495db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 54505db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 54515db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 54525db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54535db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 54545db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54555db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5456019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5457019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5458019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5459abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 546043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 546143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 546243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 546343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 546443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 546543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 546643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 546743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 546843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5469abd3a857ace59100305790545d1baae5877b8945John McCall} 5470abd3a857ace59100305790545d1baae5877b8945John McCall 5471abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 547243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 547343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 547443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 547543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 547643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 547743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 547843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 547943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 54808327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 548143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 548243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5483abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5484abd3a857ace59100305790545d1baae5877b8945John McCall} 5485abd3a857ace59100305790545d1baae5877b8945John McCall 54865db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 54875db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5488f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 54907993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 54912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 54927993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 54937993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 54945db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54955db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54965db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 54975db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5498019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5499d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 550296e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 55035db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5504745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5505745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5506d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5507745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5508d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5509d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5510d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5511f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 55122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5513d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 55147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5516d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 55177b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5519d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 55207b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5522d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 55237b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5524d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 55257b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 55267b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 55277b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 55287b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5529d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5530d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5531d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5532d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5533d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5534d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5535d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 55378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 55381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55392a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 55402a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5541c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 55422a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55432a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 55444efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5545c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5546c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5547c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 55484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 55492a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55502a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 55514efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 55524efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5553c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5554c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 55554efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5556f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 55572a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5558f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5559f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5560f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5561f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5562f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5563f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 55642a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 55654efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 55664efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5567d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5568a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 55699ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 55709ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55719ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5572770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 55738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5574f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 55751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55769ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5577f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 55788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 55791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 558047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 55818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 55828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 55841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55857ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 55867ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 55898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55909ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 55928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5593b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 559496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 55957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5596b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5597b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 55981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5599b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5600b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5601c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 56028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5603b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5604b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5606f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 56077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 56087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 56097ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 56107ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 56117ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 56127ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 56137ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 56147ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 56157ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 56167ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 56177ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 56187ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 56197ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 56207ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 56218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 56228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5623b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5624b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5625b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5626b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5627b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5628b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5629b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5630b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5631b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5632b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5633b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5634b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5635b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5636b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5637b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5638b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5639b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5640b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5641b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5642b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5643b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5644b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5645b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5647b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 56498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 56508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 56518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 56528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 56538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 56548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 56558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 56568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 56578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 56588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 56598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 56608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 56618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 56624d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 56638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 56648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 56658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 56668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 56678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 56688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 56698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 56708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 56718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 56728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 56738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 56748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 56751d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 56761d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 56778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 56788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 56798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 56808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 56818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 56828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 568333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 568433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 568533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 568633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 56878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 56888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56898786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 56907a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 56917a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 56928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5693c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 56942bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 56958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 569646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 56978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5698f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 56998786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5701b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 57028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5703b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5704b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 57058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 57068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 57078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 57118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5718c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5719c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 57208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 57238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5730c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5731c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5732c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5733c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 57348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5737b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 57388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5739b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 57409ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 57428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 57438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 57478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5748b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5749ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 57508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57531725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5754f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5755f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 57568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 57608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5767c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5768c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5769c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5770c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 57718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5772ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 57731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 57759ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 57769ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5777f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 57792ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 57802ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5781745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5782745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5783f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 57841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5785f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5786745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5787f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5788a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 57893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 57903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5791ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5792f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57932de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5794a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5795a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5796a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5797a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5798a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5799a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5800a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5801a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5802a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 58033f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 58042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5805a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5806a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5807a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5808a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5809a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5810a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5811a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5812a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5813a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 58143f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 58152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 58163f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5817f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 58183f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 58193f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 58203f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 58213f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 58221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58233f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 58243f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 58253f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 58263f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 58273f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 58283f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 58293f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 58303f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 58313f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 58323f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 58333f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 58343f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 58353f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 58363f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5837f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 58381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 58393f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 58403f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 58411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 58423f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 58433f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 58443f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 58453f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 584696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 584796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 584896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 584996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 585096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 585196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 585296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 585396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 585496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 585596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 585696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 585796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 585896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 585996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 586096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 586196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 586296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 586396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 586496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 586596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 586696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 586796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 586896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 586996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 587096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 587196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 587296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 587396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 587496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 587596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5876f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5877f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5878f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 587996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 588096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 588196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 588296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 588396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 588496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 588596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 588696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 588796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 588896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 588996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5890ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5891ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5892f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5893ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5894ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 589596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 589696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 589796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 589896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 589996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 590096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 590196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5902f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 590396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 590496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 590596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 590696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 590796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 590896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 590996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 591096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 591196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 591296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 591396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 591496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 591596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 591696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 591796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 591896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 591996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 592096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 592196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 592296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 592396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 592496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 592596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 592696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 59277ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 59287ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 59297ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 59307ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 59317ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 59327ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59337ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 59347ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59357ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 59367ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 59377ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 59387ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59397ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 59407ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59417ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59427ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 59437ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59447ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 59457ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 59467ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 59479ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5948aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5949aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5950aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5951aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5952aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5953aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5954aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5955aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5956aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5957aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5958aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5959aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5960aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5961aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5962aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5963aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5964aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5965aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5966aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5967aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5968aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5969aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5970aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5971aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5972aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5973aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5974aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5975aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5976aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5977aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 597851f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5979f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5980f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 598147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5982c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5983c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5984c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5985c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5986c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5987c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5988c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5989c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 59901e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 599159b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5992575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 59931e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 59946dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5995efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5996efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5997efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 59986dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59991e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 6000efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 6001efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 6002efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 60036dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 600447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 6005efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 6006efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 6007efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 6008660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 60091e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 601069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 6011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 6012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 6013e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 6014e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 6015e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 601651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 6017180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 601883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6019180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6020cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 6021180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 602251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 6023180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 602483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6025180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6026180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 6027180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 6028aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 6029c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 6030c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 6031c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 6032c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 6033c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 6034aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6035aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 6036c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 6037c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 6038c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6039f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 6040dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 6041660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6042f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6043660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6044660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6045660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6046660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 604783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 604883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 604983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 605083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 605183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 605283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 60537ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 605451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 605551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 605651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 605769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 605869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6059180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6060180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6061180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6062180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 606369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 606469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 606569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 606669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 606783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(CoreConstResult, Info, E)) 606883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 606983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = CoreConstResult.toAPValue(); 607083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 607169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 607269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6073f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6074f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6075f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 607651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 607751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 607851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 6079f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 6080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 6081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6082f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6084f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 6085f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 6086f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 6087f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6088f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6089f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6090f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 6091f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 609283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = Value.toAPValue(); 609383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6095c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 609651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 609756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 609856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6099c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6100c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 610151f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6102ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6103ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6104ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6105ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6106ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6107ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6108ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6109ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 61102d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 61112d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 6113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 61141445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 61151445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6116f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6117f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 611856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 611956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 61204ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 61214ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6122c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 612351f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 6124b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 6125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 612647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 6127cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6128cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 612980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 613080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 613180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 613280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 613380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 613580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 613680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6138f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6139c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6140c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6141a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6142a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 61434ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 61441b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 61451b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6146efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 614783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 614883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 614983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 615083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 615183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 615283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Tmp; 615383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.moveInto(Tmp); 615483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.Val = Tmp.toAPValue(); 615583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6156b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6157b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6158099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6159099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6160099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 61612d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 61622d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 61632d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 61642d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 61652d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 61662d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6167099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6168099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6169099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6170099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6171099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6172099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6173099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6174099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6175099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 617651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 617751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 617851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 617951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 618051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 618151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 618251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 618383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 618483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 618551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 618651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 618751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 618883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 618983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 619083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 619183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 619283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 619383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 619483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6195099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6196099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 619751f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 619851f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 61994ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 62004fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 620151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 620245b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 620351fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 62044ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 62051e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6206393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6207393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6208a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 62091c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 621051f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6211c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 621251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 62131c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 621451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 62151c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 621651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6217d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6218e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6219e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6220e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6221e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6222e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6223e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6224d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6225d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6226d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6227d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6228d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6229d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6230d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6231d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6232d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6233d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6234d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6235d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6236d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6237d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6238d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6239d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6240d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 624251f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6243d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6245d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6246d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6247d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62483c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 62493c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6253d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6256d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6257d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6258d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62593c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 62603c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 62613c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6262d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6263d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6264d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 626551f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6266d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6267d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6268d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6269d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6272d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6273d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 62742ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6275d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6276d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6277d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6278d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 627963c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6280d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6281d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6282d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6283d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6284d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6285d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6286d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6287d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6288d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6289d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6290d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6291d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6292d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6293d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6294d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6295d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6296d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6297d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6298d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6299e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6300d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6301d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 63029be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6303d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 6304d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6305d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6306d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6307d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6308d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6309d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6310d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6311d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6312d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 63134765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6314d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6315d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6316d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6317d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6318d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6319d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6320d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6321d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6322d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6323d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6324d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6325d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6326d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6327d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6328d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 6329d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 63307cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6331be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6332c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 633361eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6334f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 633503e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 63364b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6337276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6338cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 633901d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6340cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6341cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6342ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6343d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6344d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6345d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6346d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 634791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 634891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 634991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 635091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6351d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6352d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6353f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6354f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6355d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6356d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6357d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6358ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6359d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 63606ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 636121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6362552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 63632e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6364d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6365d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 63666cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 636705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 636805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 636905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6370d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6371180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6372d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6373d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6375d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 6376d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 637803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 6379d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 6380d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6381d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6382d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6383d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6384d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6385d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6386d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6388d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6389d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6390d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6391db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6392db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6393db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6394099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6395099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6396099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6397099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6398099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6399099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6400099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6402d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6403d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6404d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6405d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6406d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 64072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 64082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 64092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 64102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 64112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 64122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 641305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 641405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 641505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6416d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 64172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 64182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 64192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 64202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 64212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 64222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 64232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6424d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6426d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6427d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6428d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6429d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6430d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 643151f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 643205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6433d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6435d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6436d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6437d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6438f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6439f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6440f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6441f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6442d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6443d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6444d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6445d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6446d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6447d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 64482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 64492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 64502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 64512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 64522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 64532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 64542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 64552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 64562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 64572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 64582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 64592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 64602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 646105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 646205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 646305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6465d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 64672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 64682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 64692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 64702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 64712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 64722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 64732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 64742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 64752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 64762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 64772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 64782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 64792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 64802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 64812de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 64822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6483d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6484d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 64852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 64862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 648751f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6488d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 64893b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6490a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6494a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6495d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6496d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6497d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6498d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 65002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 6501d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 6502d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6503d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6504d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6505d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6506d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6507d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6508d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6509d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6510d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6511d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6512d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6513d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6514d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 65152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 65162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6517d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6518d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6519d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6520d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6521d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6522d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 65232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6524a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6525d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6526d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6527d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6528d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6529d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6530d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6531d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6537d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6538d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6539d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 654032cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6541f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6542d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 65432116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 65442116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 65452116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 65462116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 65472116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 65482116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 65492116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 65502116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 65512116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 65522116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 65532116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 65542116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 65552116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 65562116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 65572116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 65582116b144cf07f2574d20517187eb8863645376ebRichard Smith } 65592116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6560eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6561eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 65627a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 65637a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6564eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6565eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6566eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6568eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6569eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6570eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6571d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 657256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 657356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 657456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 657556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 657656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 657756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 657856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 657956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6580a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 658156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 658256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6583d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6584d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6586d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6587d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6588d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6589d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6590d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 659180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 659280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6593d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6594d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6595d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 659663fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6597f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6598f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 659963fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6600d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6601d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6602d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6603d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6604d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6605d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6606d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6607d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6608d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6609d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6610d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6611a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6612d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6613d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6614d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6617d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6618d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6619d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6620d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6621d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6622d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 66233026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6624d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6625d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6629f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6631f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6632f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6633f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6634f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6635f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 66364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 66374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6638dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6639dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 66404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 66414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6642dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6643f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6644f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6645dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6647f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6648f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6649d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6650d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6651d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6652d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6653d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6654f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6655f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6656f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6657f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6658f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6660f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6661f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6662f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6663f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6664f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6665d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6666d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6667d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 66684c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 666970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 667070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 667170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 667270488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 66734c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 66744c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 66754c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 66764c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 66774c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 66784c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 667970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 66804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 66814c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 66824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 66834c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 66844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 66864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 66874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 66894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 66904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 66914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 66924c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 66934c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 66944c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 66954c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66964c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 66974c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6698745f5147e065900267c85a5568785a1991d4838fRichard Smith 6699745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6700745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6701745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6702745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6703745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6704745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6705745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6706745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6707745f5147e065900267c85a5568785a1991d4838fRichard Smith 6708745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6709745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6710745f5147e065900267c85a5568785a1991d4838fRichard Smith 6711745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6712745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6713745f5147e065900267c85a5568785a1991d4838fRichard Smith 6714745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6715745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6716745f5147e065900267c85a5568785a1991d4838fRichard Smith 6717745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6718745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6719745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6720745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 672183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6722745f5147e065900267c85a5568785a1991d4838fRichard Smith 6723745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6724745f5147e065900267c85a5568785a1991d4838fRichard Smith 6725745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6726745f5147e065900267c85a5568785a1991d4838fRichard Smith 6727745f5147e065900267c85a5568785a1991d4838fRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 672883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue Scratch; 6729745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 673083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 673183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Scratch; 6732745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6733745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 673483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 6735745f5147e065900267c85a5568785a1991d4838fRichard Smith 6736745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6737745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6738