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 267bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 268bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 269bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 270bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 271bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 272bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 273bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 27408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 27508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 27608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 27708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 27808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 27908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 28083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// Index - The call index of this call. 28183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned Index; 28283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 283180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 284180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 285180f47959a066795cc0f409433023af448bb0328Richard Smith 286bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 287bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 2881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments; 289bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 2901aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith typedef llvm::DenseMap<const Expr*, APValue> MapTy; 291bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 292bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 293bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 294bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 29608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 2971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments); 298bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 299bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 300bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 301dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 302dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 303dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 304dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 305dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 306dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 307dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 308dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 309dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 310dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 311dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 312dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 313dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 314dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 315789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 316789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 317789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 318789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 319789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 320789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 321789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 322789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 323789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 324789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 325789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 326789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 327789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 328789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 329789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 330789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 331789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 332789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 333dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 334dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 33583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 33683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 33783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 34183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 34283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 34383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 34583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 34683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 34783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 34883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 349c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 350dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 351d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis 3521e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3531e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 354f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 355d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 356bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 357d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 358d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 359d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 360d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 36183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 36283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 36383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 3641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, APValue> MapTy; 365bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 366bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 367c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 368bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 370745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 371bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 372bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 373180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 374180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 375180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 376180f47959a066795cc0f409433023af448bb0328Richard Smith 377180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 378180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 379180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 380180f47959a066795cc0f409433023af448bb0328Richard Smith 381c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 382c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 383c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 384c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 385745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 386745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 387745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 388745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 389745f5147e065900267c85a5568785a1991d4838fRichard Smith 390bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 391dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 39283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 39383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 394745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 395649dfbc389671d0c852ead5953da630d675a5d43Argyrios Kyrtzidis CheckingPotentialConstantExpression(false) {} 396bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 3971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *getOpaqueValue(const OpaqueValueExpr *e) const { 398c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 399c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 400c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 401c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 40256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 403180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 404180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 405180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 406180f47959a066795cc0f409433023af448bb0328Richard Smith } 407180f47959a066795cc0f409433023af448bb0328Richard Smith 4084e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &getLangOpts() const { return Ctx.getLangOpts(); } 409c18c42345636e2866fed75c7e434fb659d747672Richard Smith 410c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 411745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 412745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 413745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 414745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 41583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 41683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 41783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 41883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 41983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 420c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 421c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 422c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 423c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 424c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 425c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 426f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 42783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 42883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 42983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 43083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 43183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 43283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 43383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 43483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 43583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 43683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 437c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 438c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 441c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 442c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 443c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 444c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 44508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 44608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 44708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 448c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 449f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 452c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 453f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 454f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 455f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 456dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 45708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 45808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 45908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 46008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 461745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 462745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 46308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 464c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 465dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 46608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 46708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 468745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 469745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 47008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 471dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 472c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 473dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 474dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 475dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 4765cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic Diag(const Expr *E, diag::kind DiagId 4775cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith = diag::note_invalid_subexpr_in_const_expr, 4785cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith unsigned ExtraNotes = 0) { 4795cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (EvalStatus.Diag) 4805cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Diag(E->getExprLoc(), DiagId, ExtraNotes); 4815cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith HasActiveDiagnostic = false; 4825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return OptionalDiagnostic(); 4835cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith } 4845cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith 485dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 486dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4875cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith template<typename LocArg> 4885cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic CCEDiag(LocArg Loc, diag::kind DiagId 4897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 490c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 491dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 49251e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 49351e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 494dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 49551e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 501c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 502c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 503c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 505099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 506099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 507099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 510099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 511099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 512099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 513745f5147e065900267c85a5568785a1991d4838fRichard Smith 514745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 515745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 516745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 51774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 51874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 519745f5147e065900267c85a5568785a1991d4838fRichard Smith } 520c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 53774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 53874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 53974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 54074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 54174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 54274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 54374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 54474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 54574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 54674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 54774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 54874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 54974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 55074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 55274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 55374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 55474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 55508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 55608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 557b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 559b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 560b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 561b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 5625cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) 563b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 564b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 568b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 5735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 574b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 575b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 576b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 5775cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 578b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 579b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 580b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 581b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 58308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 5841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments) 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 58683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 58708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 59208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 59308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 59687eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 59808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 60008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6015ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6025ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 60508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6095fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 61008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 6131aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue &Arg = Frame->Arguments[ArgIndex]; 6141aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 618bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 619d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 62008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 64808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 64908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 650bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 65108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 652d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 655f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 657f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 658f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 659f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 660f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 662f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 664f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 665f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 666f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 667f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 668f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 669f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 670f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 671f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 672f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 673f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 6741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &v) const { 675f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 6761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(FloatReal, FloatImag); 677f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 6781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(IntReal, IntImag); 679f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 6801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &v) { 68156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 68256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 68356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 68456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 68556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 68656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 68756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 68856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 68956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 69056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 69156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 692f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 693efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 694efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6951bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 696efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 69783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 6980a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 699efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 70147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 702625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 70383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 706efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7081aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (Designator.Invalid) 7091aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, APValue::NoLValuePath(), CallIndex); 7101aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 7111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, Designator.Entries, 7121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator.IsOnePastTheEnd, CallIndex); 713efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 7141aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(ASTContext &Ctx, const APValue &V) { 71547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 71647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 71747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 71883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator = SubobjectDesignator(Ctx, V); 7200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7210a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 72283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7240a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 72583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 727b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 731b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 732b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 7365cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_null_subobject) 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 739b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 7475cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // Outside C++11, do not build a designator referring to a subobject of 7485cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // any object: we won't use such a designator for anything. 7495cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (!Info.getLangOpts().CPlusPlus0x) 7505cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.setInvalid(); 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 752b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 753b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 754b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 755b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 756b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 7575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) 7585cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addDeclUnchecked(D, Virtual); 759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 760b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 7615cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, CSK_ArrayToPointer)) 7625cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addArrayUnchecked(CAT); 763b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 76486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 7655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) 7665cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addComplexUnchecked(EltTy, Imag); 76786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 768b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 7695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkNullPointer(Info, E, CSK_ArrayIndex)) 7705cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.adjustIndex(Info, E, N); 77156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 772efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7941aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7951aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(getDecl(), isDerivedMember(), Path); 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 7971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &V) { 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 862c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 863b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 864b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 865b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 866b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 867b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 868b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 869b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 870b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 871b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 872c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 873c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 874c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 875c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 876c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 877c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 878f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 87987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 8801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); 88183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 88283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 88383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 88483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 885efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 886efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 89087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 8911aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 892d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 893d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 894f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 895f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 896f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 900180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 901180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 902180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 903180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 904180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 905180f47959a066795cc0f409433023af448bb0328Richard Smith} 906180f47959a066795cc0f409433023af448bb0328Richard Smith 9071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 908180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 909180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 910180f47959a066795cc0f409433023af448bb0328Richard Smith 911180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 912180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 91442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 916180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 91842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9191bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9201bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 92142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9231bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9241bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9251bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 927b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 928b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 929b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 930b78ae9716576399145786b93f687943f8b197170Richard Smith } 931180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 932180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 933180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 934180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 935180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 93647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 937e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet case Expr::CXXUuidofExprClass: 938180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 939180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 940180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 941180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 942180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 943180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 944180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 945180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 946180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 947180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 948745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 949745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 950745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 951745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 952745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 953745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 954745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 955745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 956180f47959a066795cc0f409433023af448bb0328Richard Smith } 95742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 95842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 95983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 96083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 96183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 96283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 96383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 96483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 96583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 96783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 96883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 9701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// value for an address or reference constant expression. Return true if we 9711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// can fold this expression, whether or not it's a constant expression. 97283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 97383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 97483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 97583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 976c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 977c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 978c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 979b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 980b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 981b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 982c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 983c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 984c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 98583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 98683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 98783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 98883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 989c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 99083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 991c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 99261e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 99369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 994f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 99583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 99683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 99783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 998b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 999b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1001b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1003b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 100783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 100861e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1011c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1012b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1013c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 101483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1015c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 101683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1017c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1018c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 101969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 102047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 102147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 102251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 102351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 102451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 102551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 102651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 102751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 102851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 102951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 10305cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) 103151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 103251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 10335cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 103451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 103551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 103651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10379a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 103883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 103983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 104083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 104183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 104283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 104383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 107483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 107583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 107683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 108283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 10831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LVal.setFrom(Info.Ctx, Value); 108483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10859a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 108683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 108883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10899a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10909a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10919e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10939e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10949e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 10959e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 109683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 10979e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10989e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 109965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 110065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11010dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 110265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 110365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 11041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { 11053554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11063554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1107e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11093554283157190e67918fad4221a5e6faf9317362John McCall return true; 11103554283157190e67918fad4221a5e6faf9317362John McCall } 11113554283157190e67918fad4221a5e6faf9317362John McCall 1112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1113e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11143554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1115e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11160dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11175bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11185bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 11191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool HandleConversionToBool(const APValue &Val, bool &Result) { 1120c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1121c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1122c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1123c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1124c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 112541bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1126c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1127c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1128a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1129c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1130c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1131c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1133c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1136436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1137e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1138e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1140e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1141e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1142c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1143cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1144180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1145180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 114665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1151c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1152c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1153c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1154c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1155c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 11561aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 1157d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis if (!Evaluate(Val, Info, E)) 1158c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1159d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis return HandleConversionToBool(Val, Result); 11604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11614efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1162c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1163c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1164c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 11655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_overflow) 1166789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1167c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1168c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1169c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1171c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1172c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1173c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1174a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1175575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1177c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1178a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1179c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1180c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1181c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1182c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1183a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1184a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1185c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1187c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1188c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1189a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1190c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1191c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1193c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1194c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1195a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1196a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1197f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1198f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1199f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1200f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1201a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1202a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1203a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12049f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1205575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1206a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1207a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1208a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1209c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1210c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1211c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1212c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1213c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1214c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1216c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1218a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1219a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1220e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1221e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 12221aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue SVal; 1223e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1224e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1225e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1226e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1228e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1229e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1248e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 12505cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1261e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 12635cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1265e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1266e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1267b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1268b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1269b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1270b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1271b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1272b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1273180f47959a066795cc0f409433023af448bb0328Richard Smith 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1280180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1281180f47959a066795cc0f409433023af448bb0328Richard Smith 1282b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1283e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1284e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1285180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1286180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1287e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1288180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1290180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1291180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1292180f47959a066795cc0f409433023af448bb0328Richard Smith } 1293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1294180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1295180f47959a066795cc0f409433023af448bb0328Richard Smith} 1296180f47959a066795cc0f409433023af448bb0328Richard Smith 1297b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1298180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1299180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1300180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1301180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1302180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1303b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1304180f47959a066795cc0f409433023af448bb0328Richard Smith} 1305180f47959a066795cc0f409433023af448bb0328Richard Smith 1306b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1307180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1308180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1309180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1310180f47959a066795cc0f409433023af448bb0328Richard Smith 1311180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1312b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1313180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1314180f47959a066795cc0f409433023af448bb0328Richard Smith } 1315180f47959a066795cc0f409433023af448bb0328Richard Smith 1316b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1317b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1320180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1322b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1323180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1324180f47959a066795cc0f409433023af448bb0328Richard Smith 1325b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1326180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1327180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1328b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1329180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1330180f47959a066795cc0f409433023af448bb0328Richard Smith} 1331180f47959a066795cc0f409433023af448bb0328Richard Smith 1332180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1333180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1334b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1335180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1336180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1337180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1338180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1339180f47959a066795cc0f409433023af448bb0328Richard Smith 1340180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1341180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1342b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1343180f47959a066795cc0f409433023af448bb0328Richard Smith} 1344180f47959a066795cc0f409433023af448bb0328Richard Smith 1345d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1346d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1347d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1348d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1349d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1350d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1351d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1352d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1353d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1354180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 135574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 135674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1357180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1358180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1359180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1360180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1361180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1362180f47959a066795cc0f409433023af448bb0328Richard Smith } 1363180f47959a066795cc0f409433023af448bb0328Richard Smith 1364180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1365180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 136674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 136774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1368180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1369180f47959a066795cc0f409433023af448bb0328Richard Smith } 1370180f47959a066795cc0f409433023af448bb0328Richard Smith 1371180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1372180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1373180f47959a066795cc0f409433023af448bb0328Richard Smith} 1374180f47959a066795cc0f409433023af448bb0328Richard Smith 1375180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1376180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1377b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1378180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1379180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1380180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1381b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1382b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1383b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1384180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 138574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1386180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1387180f47959a066795cc0f409433023af448bb0328Richard Smith 1388180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1389180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1390b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1391180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1392180f47959a066795cc0f409433023af448bb0328Richard Smith} 1393180f47959a066795cc0f409433023af448bb0328Richard Smith 139486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 139586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 139686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 139786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 139886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 139986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 140086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 140186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 140286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 140386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 140486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 140586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 140686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 140786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 140886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 140986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 141086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 141186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 141203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1413f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1414f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 14151aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith CallStackFrame *Frame, APValue &Result) { 1416d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1417d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1418d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1419745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1420745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1421745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1422745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1423f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 14245cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1425177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1426f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1427177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1428177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1429d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 143003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1431099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1432099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1433099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1434745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1435745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1436745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 14375cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1438099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1439099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1440099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1441180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1442180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1443180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 14441aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *Info.EvaluatingDeclValue; 1445180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1446180f47959a066795cc0f409433023af448bb0328Richard Smith } 1447180f47959a066795cc0f409433023af448bb0328Richard Smith 144865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 144965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 14515cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 145265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1453f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 145465ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1455099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1456099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1457099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1458099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 14595cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_var_init_non_constant, 1460099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1461099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1462099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 146347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1464099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 14655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, 1466099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1467099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1468099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1469f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 147003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 14711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *VD->getEvaluatedValue(); 147247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 147303f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 147403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1475c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 147603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 147703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 147803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 147903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 148059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 148159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 148259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 148359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 148459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 148559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 148659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 148759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 148859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 148959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 149059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 149159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 149259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 149359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 149459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1495fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// Extract the value of a character from a string literal. CharType is used to 1496fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// determine the expected signedness of the result -- a string literal used to 1497fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// initialize an array of 'signed char' or 'unsigned char' might contain chars 1498fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// of the wrong signedness. 1499f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1500fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith uint64_t Index, QualType CharType) { 1501f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1502f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1503f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1504fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith assert(CharType->isIntegerType() && "unexpected character type"); 1505f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1506f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1507fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith CharType->isUnsignedIntegerType()); 1508f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1509f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1510f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1511f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1512f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1513cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 15151aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Obj, QualType ObjType, 1516cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1517b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1518b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1519cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1520b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15215cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1522aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1523aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1526f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1527cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1528745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1529745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1530745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1531cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 15320069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue *O = &Obj; 1533180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1534cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1535cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1536180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1537cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1538f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1539cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1540f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15435cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1544aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1545aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1546cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1547f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1548f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1549f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1550f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1551f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1552f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 15531aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(ExtractStringLiteralCharacter( 1554fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith Info, O->getLValueBase().get<const Expr*>(), Index, SubType)); 1555f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1556f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1557cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1558cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1559cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1560cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 156186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 156286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 156386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 156486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 15655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 156686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 156786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 156886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 156986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 157086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 157186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 15721aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexIntImag() 157386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 157486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 157586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 15761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexFloatImag() 157786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 157886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 157986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1580180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1581b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 15825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_mutable, 1) 1583b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1584b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1585b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1586b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1587b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1588180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1589180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1590180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1591180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1592180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1593f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 15945cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_inactive_union_member) 15957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1596180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1597f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1598180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1599180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1600180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1601180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16027098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16065cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_volatile_obj, 1) 16077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16105cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 16117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1614cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1615180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 161659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 161759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 161859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 161959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1620cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1621180f47959a066795cc0f409433023af448bb0328Richard Smith 1622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1623745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 16245cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_uninit); 1625180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1627cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1628cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 16290069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // This may look super-stupid, but it serves an important purpose: if we just 16300069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // swapped Obj and *O, we'd create an object which had itself as a subobject. 16310069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // To avoid the leak, we ensure that Tmp ends up owning the original complete 16320069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // object, which is destroyed by Tmp's destructor. 16330069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue Tmp; 16340069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith O->swap(Tmp); 16350069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith Obj.swap(Tmp); 1636cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1637cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1638cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1639f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1640f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1641f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1642f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1643f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1644f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1645f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1646f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 164786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 164886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1649f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1650f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1651f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1652f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1653f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 165486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 165586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 165686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 165786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1658f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1659f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1660f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1661f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1662f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1663f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1664f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1665f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1666f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1667f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1668f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1669f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1670f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1671f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1672f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1673f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1674f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1675f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1676f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1677f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1678f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1679f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1696180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1697180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1698180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1699180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1700180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1701f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1702f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17039ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17049ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1705180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1706180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1707f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1708f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 17091aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const LValue &LVal, APValue &RVal) { 1710b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1711b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1712b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1713b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1715c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1716f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1717f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17185cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 17197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 172283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 172383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 172483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 172583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 17265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 172783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 172883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 172983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17385cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_type) << Type; 17397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17405cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1741c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1742f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1743c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1745c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1746c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1747d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1748d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1750c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1751d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (VD) { 1752d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) 1753d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor VD = VDef; 1754d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor } 1755f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 17565cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17570a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1758f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1759f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 17607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 17617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 17621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 17637098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17647098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17655cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1769f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17707098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17737098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17767098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17777098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17795cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17825cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 17907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17915cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17945cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(Conv); 17957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 17987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18007098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18025cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1805f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18077098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1808f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1809c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1810c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 181147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1812f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1813c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1814c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1815c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1816c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1817c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1818c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18190a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18211bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 182283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 182383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 182483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 182583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 18265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 182783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 182883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 182983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 183083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 183183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 183283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1833c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18385cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1846177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1847cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1848cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1849177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1850cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1851cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1852cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1853cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1854cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1855c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1856cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1857cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1858f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1859f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1860f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1861f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 18621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RVal = APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0); 1863f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 18645cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 1865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1866f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1867c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1868f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1869f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1870c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1871c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 187259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 187359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 187459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 187559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 187659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 187759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 187859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 187959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 188059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1904745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1905745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1913e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1917745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1918745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1919745f5147e065900267c85a5568785a1991d4838fRichard Smith 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1924b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1925e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1926e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1927e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1938b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1939b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1940b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 1955b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 1959b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 1964d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 1965d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 1966d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 1967d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 1968d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 1969d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 1970d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1981b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 1987b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1988b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 1989b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 19905cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 1991b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 1992b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1993b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1995b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 1996b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 1997b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2001b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 20055cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 201259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 201359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2014c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2015d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2016d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2017d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2018d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2019d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2020d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2021d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2022d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2023d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2024d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2025d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 20261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 2027d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2028d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2029d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2030d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2031d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2032d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2033d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2034d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2035d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2036c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2037c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 203883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2039c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2040c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2041c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2042d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2043d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2044d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2045d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2048d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2049d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2050d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2051d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2052d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2053d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2054d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2055d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20566180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20576180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20586180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20596180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20606180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 206151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 206251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20636180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20646180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20656180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20674c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20684c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20694c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 20706180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 20714c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20724c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20734c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20744c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20754c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 20786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 20816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 20826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2083c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2084c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2085c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2087c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2088745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2089745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2090745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2091745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2092745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2093745f5147e065900267c85a5568785a1991d4838fRichard Smith 2094c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2095c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2096c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2097c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2098c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2099c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2100099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2101099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2102c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2103c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2104c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2105c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2106c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2107c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2110c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2111c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2112180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 21131aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithtypedef SmallVector<APValue, 8> ArgVector; 2114180f47959a066795cc0f409433023af448bb0328Richard Smith} 2115180f47959a066795cc0f409433023af448bb0328Richard Smith 2116180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2117180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2118180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2119745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2120180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2121745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2122745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2123745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2124745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2125745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2126745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2127745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2128745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2129745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2130745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2131180f47959a066795cc0f409433023af448bb0328Richard Smith} 2132180f47959a066795cc0f409433023af448bb0328Richard Smith 2133d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2134745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2135745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 21371aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith EvalInfo &Info, APValue &Result) { 2138180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2139180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2140180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2141d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2142745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2143745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2144745f5147e065900267c85a5568785a1991d4838fRichard Smith 2145745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2146d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2147d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2148d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2149180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2150745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 215159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2152180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 215351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2154180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2155180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2156180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2157180f47959a066795cc0f409433023af448bb0328Richard Smith 2158745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2159745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2160745f5147e065900267c85a5568785a1991d4838fRichard Smith 216186c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 216286c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 216386c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 216486c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 216586c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 216686c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2167745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2168180f47959a066795cc0f409433023af448bb0328Richard Smith 2169180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2170180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2171180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 217283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2173180f47959a066795cc0f409433023af448bb0328Richard Smith } 2174180f47959a066795cc0f409433023af448bb0328Richard Smith 2175610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2176610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2177610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2178610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2179f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor ((Definition->isCopyConstructor() && Definition->isTrivial()) || 2180f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor (Definition->isMoveConstructor() && Definition->isTrivial()))) { 2181610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 21821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS.setFrom(Info.Ctx, ArgValues[0]); 21831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 21841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS, Result); 2185610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2186610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2187610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 218851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2189180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2190180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2191180f47959a066795cc0f409433023af448bb0328Richard Smith 2192180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2193180f47959a066795cc0f409433023af448bb0328Richard Smith 2194745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2195180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2196180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2197180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2198180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2199180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2200180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2201745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2202745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2203745f5147e065900267c85a5568785a1991d4838fRichard Smith 2204745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2205180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2206180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2207180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2208180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 220986c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2210180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2211180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2212180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2213180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2214180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2215b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2216180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2217745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2218180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2219b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2220180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2221180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2222745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2223745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2224745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2225745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2226d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2227d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2228d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2229d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2230d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2231d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2232d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2233d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2234d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2235d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2236d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2237d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2238d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2239d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2240d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2241d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2242d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2243d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2244d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2245d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2246d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2247745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2248d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2249d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2250d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2251d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2252d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2253180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2254d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2255180f47959a066795cc0f409433023af448bb0328Richard Smith } 2256745f5147e065900267c85a5568785a1991d4838fRichard Smith 225783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 225883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2259745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2260745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2261745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2262745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2263745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2264745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2265745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2266180f47959a066795cc0f409433023af448bb0328Richard Smith } 2267180f47959a066795cc0f409433023af448bb0328Richard Smith 2268745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2269180f47959a066795cc0f409433023af448bb0328Richard Smith} 2270180f47959a066795cc0f409433023af448bb0328Richard Smith 2271d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2272770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 22738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 22741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2275c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2276c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22771e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2278c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2279c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 22808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2281c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2282c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2283c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 22848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 22858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2286f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2287f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 22888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 22891e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2290c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2291c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2292c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2293f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 22941e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2295f85e193739c953358c865005855253af4f68a497John McCall return true; 2296f85e193739c953358c865005855253af4f68a497John McCall return false; 2297f85e193739c953358c865005855253af4f68a497John McCall } 2298f85e193739c953358c865005855253af4f68a497John McCall 2299c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2300c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 23018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 23028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 23038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2304c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 23058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 23068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 23078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 23088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 23098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 23108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2311f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 23128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2313980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 23151e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 23168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 23178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 23188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 23198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2320980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 23228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 23238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 23248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 23258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 23261e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2327c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2328980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2329c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2331363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2332363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2334363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2335363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23374423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2338363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2339363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2340ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 23418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2342c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2343c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 234456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 234556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 234656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 234756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 234856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 234956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 235056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 235156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 235256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 235356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 23541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 235556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 235656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 235756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 235856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 235956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 236056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 236156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 236256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 236374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: For a recursive constexpr call, an outer stack frame might have 236474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // been using this opaque value too, and will now have to re-evaluate the 236574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // source expression. 236656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 236756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 236856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 236956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2370c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2371c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23724efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 23748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 23768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2377f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2378f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 23821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RetTy DerivedSuccess(const APValue &V, const Expr *E) { 23838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 238551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 238651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2387f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 238974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 239074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 239174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 239274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 239374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 239474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 239574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 239674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 239774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 239874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 239974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 240074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 240274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 240374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 240474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 240574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 240674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 240774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 240874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 240974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 241274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 241374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 241574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 241674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 241774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 241874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 241974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 242074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 242174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 242274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 242374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 242474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 242574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 242674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 242774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 24288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 24298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 24308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 24318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 24328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2433dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 24345cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Info.CCEDiag(E, D); 2435f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2436f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2437cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2438cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2439cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 2440cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 2441cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2442cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &getEvalInfo() { return Info; } 2443cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2444f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 24475cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, D); 2448f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2449f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2451f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2452f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2453f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 24548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2455b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 24568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2458f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 24598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 24628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 24648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 24668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 24678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 24688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 24698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 24708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 247191a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 247291a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 24733d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 24743d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2475bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2476bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2477bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2478bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 24798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2480c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2481c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2482c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2483c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2484c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2485c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2486c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2487c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2488c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2489e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2490e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2492f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2494e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2495e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2497e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2500e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2501e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2502e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 25031aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2505e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2506e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2507e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2508e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2509e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2510e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 25118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 251274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Cache the value of the common expression. 25138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 25148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2515f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 25168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 251774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 25188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2528f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2529f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2530f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2531f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2532f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2533f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2534f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2535f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2536f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2537f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 253874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2539f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2540f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2541f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2542f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2543f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2544f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 25458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 25481aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Value = Info.getOpaqueValue(E); 254942786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 255042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 255142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2552f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 255342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 255442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2555f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 255642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 255742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 255842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 255947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 25608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2561f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2562d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2563e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2564d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2565d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 25666142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 256759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 256859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 256986c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 257059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 257159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 257259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2573f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2574e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2575e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2576e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2577f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2578f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 258086c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2583f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2584f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2585e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2588f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2590f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2591f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 259259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2593b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2594b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 259659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2597b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2598f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25991bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 26001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 260159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2602f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 260359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 260459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 260559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 260659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 260759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2608f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2610f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2613f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 261459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 261559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 261659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 261759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 261859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2619d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 262059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 262159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2622f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 262359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2624f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2625d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2626b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2627b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2628b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 262986c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 263086c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 263186c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 263286c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 263386c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 263486c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2635c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2636d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 26371aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2638d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2639c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2640745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2641745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2643d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 264483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2645d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2646d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2647c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2648c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2649c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2650f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 265171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 265271523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 265371523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 265471523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2655f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2656f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2657f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 265851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2659f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2660f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 266151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2662f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 266451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2666f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2667180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2668180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2669180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2670180f47959a066795cc0f409433023af448bb0328Richard Smith 26711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 2672180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2673180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2674180f47959a066795cc0f409433023af448bb0328Richard Smith 2675180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2676180f47959a066795cc0f409433023af448bb0328Richard Smith 2677180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2678f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2679180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2680180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2681180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2682180f47959a066795cc0f409433023af448bb0328Richard Smith 2683b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2684b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2685180f47959a066795cc0f409433023af448bb0328Richard Smith 2686f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2687180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2688180f47959a066795cc0f409433023af448bb0328Richard Smith } 2689180f47959a066795cc0f409433023af448bb0328Richard Smith 2690c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2691c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2692c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2693c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2694c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26957a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26967a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2697c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26987d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2699c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2700c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2701c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2702c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2703f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2704f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 27051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RVal; 27069ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 27079ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 27089ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2709f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2710f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2711c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2712c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2713c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2714f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2715c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2716c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27178327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 27188327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 27191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 27208327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 27218327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 27228327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 27238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 27248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 27268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2738e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 27481aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 27491aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(this->Info.Ctx, V); 2750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2752e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2753e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2754e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2755e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2756e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2757e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2758e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2759e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2760c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2761af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2762c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2763c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2764c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2771d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2772d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2773d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2774d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2775d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2776d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2777d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2778d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2779d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2780d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2782d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 27831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RefValue; 2784d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2819b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 28334efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2834c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2835c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2836c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2837c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2838c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2840c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 28411bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 28421bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 28431bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 28441bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2845c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2846c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 284747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2848c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2849180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2850c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2851c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2852c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2853c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 28541bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 285583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 285683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 28571bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 28584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 28594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2860770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 28624efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 28651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2866c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2867c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 28688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 28698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2870bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 28718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 28728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 28738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 28748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 287547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 2876e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet bool VisitCXXUuidofExpr(const CXXUuidofExpr *E); 28778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 28788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 287986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 288086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 28818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 288326bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 288426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 288626bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2887db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2888c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28910a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28920a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2893db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2895180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2896180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 289826bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 289926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 29004efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 29014efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 29024efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2903c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2904c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2905c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2906c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2907c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2908efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2910c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2911c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 29128cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 29134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29144efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 29161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 29171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 29181bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2920c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2921c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2922436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2923c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2924177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2925177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 292683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2927177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2928177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 29291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2930177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 293150c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 29321aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue V; 2933f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2934f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2935f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 293635873c49adad211ff466e34342a52665742794f5Anders Carlsson} 293735873c49adad211ff466e34342a52665742794f5Anders Carlsson 2938bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2939bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2941af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 294483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 294583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 294683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2954f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 295783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2959bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2960bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 29628cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2963c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2964c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2965c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2966efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 29674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29684efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 296947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 297047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 297147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 297247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 297347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 29745cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_typeid_polymorphic) 297547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 297647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 297747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 297847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 297947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 298047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 298147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 2982e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichetbool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) { 2983e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet return Success(E); 2984e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet} 2985e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet 29868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2987c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2988c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2989c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2990c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2991c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2992c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2993d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2994d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2995d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2996d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2998d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2999d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 3000d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 3001180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 3002e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 30034efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30044efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 3006c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 3007c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 3008f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3009c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 30103068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 3011efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30133068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 30143068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 3015efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3016180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 3017180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 3018180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 30193068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 3020b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 30213068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 30224efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 3024efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 3025e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 3026e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 302786024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 302886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 302986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 303086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 303186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 303286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 303386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 303486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 303586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 303686024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 303786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 303886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 303986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 304086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 304186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 304286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 304386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 304486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 30454efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 3046f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 3047f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3048f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3049c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 3050770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 30518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 3052efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 3053efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 30548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 30551bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 3056efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3057efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 30582bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 30591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3060efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 30618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 3062f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 30631aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 30641aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, V); 30658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 30662bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 306751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3068f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 3069f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 30702bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3071efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 30728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3073efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 30748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3075efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 3076eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) 3077ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek { return Success(E); } 30788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3079efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 30808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 30818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3082469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3083efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3084f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3085b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3086180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3087180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3088f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3089180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3090180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3091180f47959a066795cc0f409433023af448bb0328Richard Smith } 309256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3093ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30942bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3095f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30962bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3097efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3098c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3100f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3101650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3102efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 31032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 31042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3105e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 31061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3107650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3108650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3109650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3110f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 31111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3112745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3113745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3114efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 31151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3116efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3117745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3118efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3119efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3120efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3121efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 31220a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 31230a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3124650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3125180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3127b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3128650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 31294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3130efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3131efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 31324efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 31331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 31358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3136650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 313709a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 313809a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 313909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 314009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 31421d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 31431d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 31442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 314528c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 314628c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3147c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3148c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3149c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 31504cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 315128c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 31524cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 31534cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 31544cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 31554cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 31564cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 31574cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 31580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 315909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31605c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 31615c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 316247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 31635c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3164e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 31665c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3167180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 31685c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3169180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3170180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 31715c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3172180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 31735c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3175b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 31765c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3177180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 31785c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31795c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 31805c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 31815c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31825c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3183e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3184e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3185e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3186e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3187e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 319047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 319149149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 319251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3193404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3195c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3196c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 31971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Value; 3198efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 319909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 320069ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3201efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 320247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 320347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 32041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 320547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 320683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 32070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3208efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3209efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3210efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 32111aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, Value); 3212efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3213650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3214650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 32152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3216e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3217e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3218e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3219e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 322083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 322183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 322283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3223e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3224e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 32250a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3228b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3229b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3230b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 32310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 32326a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 32332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 32346a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 32354efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 32364efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3237c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 32381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3239650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 32408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3241180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3242efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 324356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 32448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 32454efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3246f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3247f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3249e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3250e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3251e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3257e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3258e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3259e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3260e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3261e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3262e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3263e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 32651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 3266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 326951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3271e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3273e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3274e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3275e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3276e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3277e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3278e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3279e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3280e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3281e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3282e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3283e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3284e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3285e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3287e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3289e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 329049149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 329151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3293e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3294e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3302e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3303e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3304e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3305e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3307f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3308e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3311f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3314e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3316e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3317e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3318e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3319e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3320e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3321e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3322e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3323f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3326e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3327e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3328e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3329e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3330e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3336180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3337180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3338180f47959a066795cc0f409433023af448bb0328Richard Smith 3339180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3340180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3341180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3342180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3343180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3344180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3345180f47959a066795cc0f409433023af448bb0328Richard Smith 3346180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3347180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3348180f47959a066795cc0f409433023af448bb0328Richard Smith 33491aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 335083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 335183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3352180f47959a066795cc0f409433023af448bb0328Richard Smith } 335351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3354180f47959a066795cc0f409433023af448bb0328Richard Smith 335559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3356180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3357180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3358180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3359180f47959a066795cc0f409433023af448bb0328Richard Smith} 3360180f47959a066795cc0f409433023af448bb0328Richard Smith 336151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 336251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 336351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 336451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 336551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 336651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 336751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3368b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3369b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 337051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 337151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 337251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 337351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 337451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 337551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 337651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 337751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 337851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 337951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 338051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3381b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 338251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 338351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3384b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3385b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 338651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 338751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 338851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 338951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 339051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3391b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3392b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 339351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 339451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 339551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 339651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 339751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3398b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 339951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 340051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 340183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 340251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 340351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 340451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 340551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 340651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 340751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 340851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 340951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 341051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 341151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 341251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 341351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 341451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 341551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 341651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 341751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 341851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 341951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3421b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 342251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 342351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 342483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 342551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 342651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3427ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 34285cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_virtual_base) << RD; 3429ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3430ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3431ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3432b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 343351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 343451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 343559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 343659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 343759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 343859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 343959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 344059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 344159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 344259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 344359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 344459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 34451aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue DerivedObject; 3446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 344759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3448f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3449f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 345059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 345159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 345259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 345359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 345459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 345559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 345659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 345759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 345859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 345959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 346059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 346159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 346259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 346359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 346459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 346559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 346659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3467180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 346824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 346924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 347024fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 347124fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3472180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3473180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3474180f47959a066795cc0f409433023af448bb0328Richard Smith 3475180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3476ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3477ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3478ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3479180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3480ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3481ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3482ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3483ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3484ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3485ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3486180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3487ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 348883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3489180f47959a066795cc0f409433023af448bb0328Richard Smith } 3490180f47959a066795cc0f409433023af448bb0328Richard Smith 3491180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3492180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3493180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3494180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3495180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3496745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3497180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3498180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3499180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3500180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3501180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3502180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3503180f47959a066795cc0f409433023af448bb0328Richard Smith 3504180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3505180f47959a066795cc0f409433023af448bb0328Richard Smith 3506745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3507745f5147e065900267c85a5568785a1991d4838fRichard Smith 3508745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3509745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3510745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3511745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3512745f5147e065900267c85a5568785a1991d4838fRichard Smith 3513745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3514745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3515745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3516745f5147e065900267c85a5568785a1991d4838fRichard Smith 351783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3518745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3519745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3520745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3521180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3522745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3523180f47959a066795cc0f409433023af448bb0328Richard Smith } 3524180f47959a066795cc0f409433023af448bb0328Richard Smith } 3525180f47959a066795cc0f409433023af448bb0328Richard Smith 3526745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3527180f47959a066795cc0f409433023af448bb0328Richard Smith} 3528180f47959a066795cc0f409433023af448bb0328Richard Smith 3529180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3530180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 353151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 353251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3533ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3534ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3535ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3536ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 353751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 353851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 353951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 35406180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 35416180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 35426180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 35436180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 35446180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 35456180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 35466180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 35476180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 35486180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3549180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3550180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3551180f47959a066795cc0f409433023af448bb0328Richard Smith 3552c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3553c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3554180f47959a066795cc0f409433023af448bb0328Richard Smith 3555610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 355651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3557180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3558180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3559180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3560180f47959a066795cc0f409433023af448bb0328Richard Smith 356151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 356251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 356351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3564180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3565745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3566f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3567f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3568180f47959a066795cc0f409433023af448bb0328Richard Smith} 3569180f47959a066795cc0f409433023af448bb0328Richard Smith 3570180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3571180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3572180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3573180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3574180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3575180f47959a066795cc0f409433023af448bb0328Richard Smith} 3576180f47959a066795cc0f409433023af448bb0328Richard Smith 3577180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3578e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3579e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3581e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3583e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3584e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3585e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3586e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3587e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3588e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3589e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3590e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3591e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3592e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 359383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 359483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3595e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3596e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3597e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3598e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3599e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3600e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3601e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3602e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3603e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3604e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3605e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3606e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3607e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3608e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3609e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3610e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3611e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3612e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3613e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3614e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3615e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3616e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3617e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3618e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3619e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3620af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3621e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3622e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3623e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3624e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 362559b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 362659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 362759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 362859b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3629770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 363007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 363107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 363259b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 36331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 363407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 363507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 36361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 363707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 363807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 363907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 364007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 364107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 364207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 36431aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 364469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 364507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 364607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 364707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 364851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 36491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 365007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 365191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 365207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 365307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 365407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 365591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 36562217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 365791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 365859b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 365959b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 366059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 366159b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3662c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 366307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 366459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 366559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 366607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 366707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3668c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 36691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3670d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3671e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 367259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 367346a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 367446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 367507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 367646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 367746a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 367846a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3679f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 368007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 368146a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 368246a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 368346a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3684f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 368507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 368646a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 368707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 368846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3689c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3690c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 369107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 369207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3693e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3694e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3695e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3696e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3697e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3698e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3699e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3700e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3701e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3702e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3703e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3704e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3705e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3706e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3707e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3708e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3709e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3710e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3711e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3712e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3713e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3714e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3715e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3716e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3717e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3718e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3719e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3720e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3721e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3722e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3723e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3724e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3725e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3726e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3727e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3728e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3729e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3730e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3731e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 373246a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3733c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3734c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 373559b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 373659b5da6d853b4368b984700315adf7b37de05764Nate Begeman 373707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 373859b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 373907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 374059b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 374191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 37421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 374359b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 37445f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 374559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 37463edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 37473edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 37483edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 37493edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 37503edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 37513edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 37523edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 37533edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 37543edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 37553edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 37563edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 37573edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 37583edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 37593edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 37603edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 37613edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 37623edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 376359b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 37643edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37653edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 37664b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37673edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 37683edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 37693edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 37703edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 377159b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 377259b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 37733edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37743edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 37754b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37763edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 37773edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 37783edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 37793edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 378059b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 37813edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 378259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 378307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 378459b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 378559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 378607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 378751201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 378807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 378991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 379091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 379191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 379291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 379391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 379491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 379591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 379691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 37975f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 379807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 379991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 380091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 380107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 38028327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 380351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 380491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 380591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 380659b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3807cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3808cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3809cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3810cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3811cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3812cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3813180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3814cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3815cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3816cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3817180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3818180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3819cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3820cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3821f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3822f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3823cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3824cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3825cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3826cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 382751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3828180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3829180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3830180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3831f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3832180f47959a066795cc0f409433023af448bb0328Richard Smith 3833180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3834180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3835180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3836180f47959a066795cc0f409433023af448bb0328Richard Smith 383751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3838180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3839b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3840180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 384183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3842180f47959a066795cc0f409433023af448bb0328Richard Smith } 3843180f47959a066795cc0f409433023af448bb0328Richard Smith 3844cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3846cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3847cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3848cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3849180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3850180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 385151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3852180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3853cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3854cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3855cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3856cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3857cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3858f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3859cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3860974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3861974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3862fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith if (E->isStringLiteralInit()) { 3863974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3864974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3865974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 38661aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 3867f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3868f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3869974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3870974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3871745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3872745f5147e065900267c85a5568785a1991d4838fRichard Smith 3873cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3874cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3875180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3876b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3877180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3878cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3879180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 388083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 388183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3882745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3883745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3884745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3885745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3886745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3887745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3888180f47959a066795cc0f409433023af448bb0328Richard Smith } 3889cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3890745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3891cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3892180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3893180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3894180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3895180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 389683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 389783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3898cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3899cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3903f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3905ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3906ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3907ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 39126180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 391351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 391451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3915ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3916ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3917ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 391851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 391951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3920b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 392151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 392283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 392351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 392451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 39256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 39266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 39276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 39286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 39296180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 39306180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 39316180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 39326180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 39336180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 39346180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3938c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3939c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3946b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 394751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3948ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 394951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 395083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 395151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 395251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 395351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3955745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 3958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3960cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3961f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3962c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3963c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3964c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3965c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3966f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3967f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3968f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3969770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 39708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 39711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Result; 3972f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 39731aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith IntExprEvaluator(EvalInfo &info, APValue &result) 39748cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3975f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3976cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) { 3977973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 39782ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3979973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 39803f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3981973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39823f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39831aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(SI); 39843f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 39853f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 3986cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E) { 3987cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(SI, E, Result); 3988cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 39893f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3990cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) { 39912ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39922ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 399330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39943f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39951aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(APSInt(I)); 3996575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3997575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3998131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3999131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4000cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E) { 4001cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(I, E, Result); 4002cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4003131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4004cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 40052ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 40062ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 40071aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); 4008131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 4009131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4010cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E) { 4011cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(Value, E, Result); 4012cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4013131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 40144f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 40154f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 40164f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 40174f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 40181aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 40195930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 4020342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 4021342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 4022342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 40238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 402432fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 40251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 402651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 4027f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 40288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 40298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 40308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 4031f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40324c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 4033131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40344c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 40354c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 4036131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40374c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 4038043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 4039043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 4040043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 40418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 40428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 40438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4045043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4046043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4047043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4048c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4049043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4050043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40518cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4053043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4054043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40558cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4056b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4058b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4059f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4061f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 40620518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 40633068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4064131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40653068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 40661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4067ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { 4068ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek return Success(E->getValue(), E); 4069ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } 4070ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek 4071f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 40723f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 407351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4074664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4075664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 407664b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 40770dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 407864b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 407964b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 40806ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 40816ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 40826ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 40836ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 40844ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor bool VisitTypeTraitExpr(const TypeTraitExpr *E) { 40854ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor return Success(E->getValue(), E); 40864ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor } 40874ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor 408821ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 408921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 409021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 409121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4092552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4093552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4094552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4095552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4096722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4097664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4098664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4099295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4100ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4101cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4102fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 41038b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 41048b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 41051bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 41068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4107664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4108f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4109f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4110f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4111c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4112c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4113c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4114c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4115c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4116c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4117c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4118c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 41191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 412047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4121c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 41228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 412369ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 412469ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4125f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 41261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 4127f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4128f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4129f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4130f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4131f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 41325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 413330c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4134f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 413530c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 413630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4137f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4138f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4139f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4140f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4141f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4142043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 41434c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4144bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4145973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4146973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4147973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4148973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4149973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4150973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4151973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4152973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4153973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4154973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4155973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4156973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4157973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4158973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4159973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4160973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4161973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4162bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41644c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41654c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4166a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4167a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4168a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4169a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 41707c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4171a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4172a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4173a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4174a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4175a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4176a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4177a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4178a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4179a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4180a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4181a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 41821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 41831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4184a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4185a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4186a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 41871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4188a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4189a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4190a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4191a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4192a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4193a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4194a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4195a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4196a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4197a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4198a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4199a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4200a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4201a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4202a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4203a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4204a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4205a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4206a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4207a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4208a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4209fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4210a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4211a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4212a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4213a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4214a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4215a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4216a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4217a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4218b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4219a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4220a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 422180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 422280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 422380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 422480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 422580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 422680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 422780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 42288e55ed1ad3acf9c7f8424aa7d326b3b2c18e943bDouglas Gregor const Expr *E = LV.getLValueBase().template dyn_cast<const Expr*>(); 422980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 423080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 423180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 423280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 423380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 423480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 423580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 423680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 423780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 423880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 423980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 424080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 424180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 424280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 424380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 424480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 424580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 424680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 424780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 424880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 424980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 425080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 425180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 425280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 425380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 425480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 425580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 425680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 425780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 425880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 425980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 426080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 426180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 426280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 426380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 426480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 426580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 426680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 426780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 426880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 426980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 427080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 427180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 427280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 427380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 427480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 427580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 427642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 427742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 42781bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 42791bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 42801bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 428142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 42821bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 42831bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 42841bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 428542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 428642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 428742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 428842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 428942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 429142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 429242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 429342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 429442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 429542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 429642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 42971bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 429842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42991bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 430042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 430142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 43021357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 430342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 430442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4305f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 430642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 430742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 430842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 430942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 431042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 431142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 431242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 431342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 43144f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 431542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 431642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 43182c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith switch (unsigned BuiltinOp = E->isBuiltinCall()) { 4319019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 43208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 432164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 432264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 432342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 432442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 432564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4326b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4327b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4328393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4329a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4330cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 433164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 433264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4333c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4334f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 433564eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 433664eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4337019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4338131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 434080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 434180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4342e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 434321fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4344a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4345bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 434621fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 434721fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4348c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4349c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4350c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 435140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43525726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 435340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 435440b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 43555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_function) 435640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 435740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 43585cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 435940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43605726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43615726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43625726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43645726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43655726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43665726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43675f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 43685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 43695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 43705726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 43715726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 43725726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 43735726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 43745726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4376454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 43772c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith case Builtin::BI__atomic_always_lock_free: 4378fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__atomic_is_lock_free: 4379fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__c11_atomic_is_lock_free: { 4380454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4381454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4382454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4383454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4384454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4385454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4386454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4387454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4388454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4389454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4390454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4391454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4392454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4393454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4394454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 43952c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size.isPowerOfTwo()) { 43962c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // Check against inlining width. 43972c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith unsigned InlineWidthBits = 43982c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 43992c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) { 44002c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free || 44012c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Size == CharUnits::One() || 44022c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith E->getArg(1)->isNullPointerConstant(Info.Ctx, 44032c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Expr::NPC_NeverValueDependent)) 44042c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline appropriately-aligned operations of this size, 44052c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // and _Atomic(T) is appropriately-aligned. 44062c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 44072c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith 44082c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()-> 44092c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith castAs<PointerType>()->getPointeeType(); 44102c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (!PointeeType->isIncompleteType() && 44112c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) { 44122c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline operations on this object. 44132c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 44142c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 44152c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 44162c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 4417454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 44182c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return BuiltinOp == Builtin::BI__atomic_always_lock_free ? 44192c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Success(0, E) : Error(E); 4420454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4421019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 44224c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4423f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4424625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4425625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4426625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4427625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4428625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4429625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44301bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4432625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4433625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4434625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4435625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44369a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4437625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4438625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4439625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4440625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 444183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4442625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4443625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44447b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44457b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44467b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44477b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44497b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44507b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44517b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44527b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44537b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44547b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44557b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44567b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44577b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44587b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44597b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44607b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4461cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisnamespace { 4462c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 4463cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// \brief Data recursive integer evaluator of certain binary operators. 4464cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// 4465cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// We use a data recursive algorithm for binary operators so that we are able 4466cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// to handle extreme cases of chained binary operators without causing stack 4467cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// overflow. 4468cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisclass DataRecursiveIntBinOpEvaluator { 4469cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct EvalResult { 4470cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue Val; 4471cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Failed; 4472cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4473cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult() : Failed(false) { } 4474cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4475cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void swap(EvalResult &RHS) { 4476cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Val.swap(RHS.Val); 4477cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Failed = RHS.Failed; 4478cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.Failed = false; 4479cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4480cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4481cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4482cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct Job { 4483cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *E; 4484cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult LHSResult; // meaningful only for binary operator expression. 4485cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind; 4486cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4487cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job() : StoredInfo(0) { } 4488cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void startSpeculativeEval(EvalInfo &Info) { 4489cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OldEvalStatus = Info.EvalStatus; 4490cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.Diag = 0; 4491cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo = &Info; 4492cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4493cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ~Job() { 4494cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (StoredInfo) { 4495cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo->EvalStatus = OldEvalStatus; 4496cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4497cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4498cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis private: 4499cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo *StoredInfo; // non-null if status changed. 4500cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Expr::EvalStatus OldEvalStatus; 4501cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4502cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4503cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SmallVector<Job, 16> Queue; 4504cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4505cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis IntExprEvaluator &IntEval; 4506cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &Info; 4507cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue &FinalResult; 4508cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4509cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 4510cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result) 4511cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { } 4512cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4513cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// \brief True if \param E is a binary operator that we are going to handle 4514cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// data recursively. 4515cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// We handle binary operators that are comma, logical, or that have operands 4516cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// with integral or enumeration type. 4517cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis static bool shouldEnqueue(const BinaryOperator *E) { 4518cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return E->getOpcode() == BO_Comma || 4519cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->isLogicalOp() || 4520cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis (E->getLHS()->getType()->isIntegralOrEnumerationType() && 4521cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4522cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4523cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4524cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Traverse(const BinaryOperator *E) { 4525cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(E); 4526cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult PrevResult; 4527b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu while (!Queue.empty()) 4528b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu process(PrevResult); 4529b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu 4530b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu if (PrevResult.Failed) return false; 4531cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4532cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis FinalResult.swap(PrevResult.Val); 4533cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4534a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4535a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4536cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisprivate: 4537cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 4538cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4539cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4540cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const APSInt &Value, const Expr *E, APValue &Result) { 4541cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4542cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4543cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E) { 4544cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E); 4545cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4546cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E, diag::kind D) { 4547cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E, D); 4548cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4549cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4550cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 4551cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Info.CCEDiag(E, D); 4552cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4553cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 45549293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis // \brief Returns true if visiting the RHS is necessary, false otherwise. 45559293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4556cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags); 45572fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4558cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4559cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result); 4560cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4561cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void EvaluateExpr(const Expr *E, EvalResult &Result) { 4562cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Failed = !Evaluate(Result.Val, Info, E); 4563cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (Result.Failed) 4564cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Val = APValue(); 4565cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4566cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4567b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu void process(EvalResult &Result); 4568cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4569cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void enqueue(const Expr *E) { 4570cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E = E->IgnoreParens(); 4571cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.resize(Queue.size()+1); 4572cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().E = E; 4573cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().Kind = Job::AnyExprKind; 4574cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4575cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis}; 4576cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4577cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4578cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4579cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 45809293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4581cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags) { 4582cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4583cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Ignore LHS but note if we could not evaluate it. 4584cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed) 4585cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4586cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4587cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4588cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4589cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4590cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult; 4591cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (HandleConversionToBool(LHSResult.Val, lhsResult)) { 45922fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We were able to evaluate the LHS, see if we can get away with not 45932fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 4594cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (lhsResult == (E->getOpcode() == BO_LOr)) { 45959293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis Success(lhsResult, E, LHSResult.Val); 45969293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS 45972fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 45982fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } else { 45992fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Since we weren't able to evaluate the left hand side, it 46002fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // must have had side effects. 46012fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4602cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4603cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 4604cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4605cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Don't ignore RHS and suppress diagnostics from this arm. 4606cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SuppressRHSDiags = true; 4607cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4608cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4609cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4610cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4611cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4612cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4613cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4614cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4615cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed && !Info.keepEvaluatingAfterFailure()) 46169293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS; 46179293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis 4618cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4619cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 46202fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4621cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 4622cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4623cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result) { 4624cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4625cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSResult.Failed) 4626cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4627cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSResult.Val; 4628cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4629cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4630cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4631cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4632cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult, rhsResult; 4633cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult); 4634cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult); 4635cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4636cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSIsOK) { 4637cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 4638cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_LOr) 4639cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult || rhsResult, E, Result); 4640cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4641cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult && rhsResult, E, Result); 4642cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4643cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else { 4644cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 46452fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 46462fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 46472fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (rhsResult == (E->getOpcode() == BO_LOr)) 4648cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(rhsResult, E, Result); 46492fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 46502fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4651cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 46522fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return false; 46532fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4654cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4655cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4656cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4657cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4658cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed || RHSResult.Failed) 4659cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4660cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4661cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &LHSVal = LHSResult.Val; 4662cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &RHSVal = RHSResult.Val; 4663cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4664cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like (unsigned long)&a + 4. 4665cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4666cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = LHSVal; 4667cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CharUnits AdditionalOffset = CharUnits::fromQuantity( 4668cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.getInt().getZExtValue()); 4669cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add) 4670cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += AdditionalOffset; 4671cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4672cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() -= AdditionalOffset; 4673cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4674cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4675cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4676cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like 4 + (unsigned long)&a 4677cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add && 4678cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.isLValue() && LHSVal.isInt()) { 4679cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSVal; 4680cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += CharUnits::fromQuantity( 4681cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHSVal.getInt().getZExtValue()); 4682cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4683cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4684cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4685cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 4686cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle (intptr_t)&&A - (intptr_t)&&B. 4687cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.getLValueOffset().isZero() || 4688cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSVal.getLValueOffset().isZero()) 4689cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4690cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 4691cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 4692cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSExpr || !RHSExpr) 4693cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4694cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 4695cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 4696cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSAddrExpr || !RHSAddrExpr) 4697cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4698cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Make sure both labels come from the same function. 4699cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSAddrExpr->getLabel()->getDeclContext() != 4700cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSAddrExpr->getLabel()->getDeclContext()) 4701cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4702cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = APValue(LHSAddrExpr, RHSAddrExpr); 4703cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4704cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4705cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4706cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // All the following cases expect both operands to be an integer 4707cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.isInt() || !RHSVal.isInt()) 4708cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4709cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4710cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APSInt &LHS = LHSVal.getInt(); 4711cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APSInt RHS = RHSVal.getInt(); 4712cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4713cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (E->getOpcode()) { 4714cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis default: 4715cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4716cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Mul: 4717cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4718cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() * 2, 4719cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::multiplies<APSInt>()), E, 4720cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4721cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Add: 4722cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4723cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4724cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::plus<APSInt>()), E, Result); 4725cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Sub: 4726cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4727cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4728cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::minus<APSInt>()), E, Result); 4729cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_And: return Success(LHS & RHS, E, Result); 4730cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Xor: return Success(LHS ^ RHS, E, Result); 4731cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Or: return Success(LHS | RHS, E, Result); 4732cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Div: 4733cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Rem: 4734cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS == 0) 4735cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E, diag::note_expr_divide_by_zero); 4736cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is 4737cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // not actually undefined behavior in C++11 due to a language defect. 4738cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isNegative() && RHS.isAllOnesValue() && 4739cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.isSigned() && LHS.isMinSignedValue()) 4740cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 4741cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E, 4742cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4743cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shl: { 4744cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // During constant-folding, a negative shift is an opposite shift. Such 4745cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // a shift is not a constant expression. 4746cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isSigned() && RHS.isNegative()) { 4747cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4748cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4749cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_right; 4750cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4751cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4752cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_left: 4753cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of 4754cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // the shifted type. 4755cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4756cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) { 4757cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4758cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4759cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else if (LHS.isSigned()) { 4760cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4761cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // operand, and must not overflow the corresponding unsigned type. 4762cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHS.isNegative()) 4763cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4764cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else if (LHS.countLeadingZeros() < SA) 4765cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_discards); 4766cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4767cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4768cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS << SA, E, Result); 4769cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4770cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shr: { 4771cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // During constant-folding, a negative shift is an opposite shift. Such a 4772cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // shift is not a constant expression. 4773cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isSigned() && RHS.isNegative()) { 4774cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4775cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4776cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_left; 4777cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4778cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4779cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_right: 4780cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4781cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // shifted type. 4782cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4783cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) 4784cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4785cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4786cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4787cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS >> SA, E, Result); 4788cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4789cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4790cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LT: return Success(LHS < RHS, E, Result); 4791cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GT: return Success(LHS > RHS, E, Result); 4792cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LE: return Success(LHS <= RHS, E, Result); 4793cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GE: return Success(LHS >= RHS, E, Result); 4794cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_EQ: return Success(LHS == RHS, E, Result); 4795cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_NE: return Success(LHS != RHS, E, Result); 4796cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4797cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4798cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4799b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieuvoid DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) { 4800cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job &job = Queue.back(); 4801cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4802cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (job.Kind) { 4803cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::AnyExprKind: { 4804cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) { 4805cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (shouldEnqueue(Bop)) { 4806cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpKind; 4807cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getLHS()); 4808b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4809cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4810cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4811cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4812cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvaluateExpr(job.E, Result); 4813cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4814b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4815cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4816cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4817cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpKind: { 4818cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4819cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool SuppressRHSDiags = false; 48209293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) { 4821cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4822b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4823cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4824cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SuppressRHSDiags) 4825cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.startSpeculativeEval(Info); 48269293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis job.LHSResult.swap(Result); 4827cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpVisitedLHSKind; 4828cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getRHS()); 4829b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4830cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4831cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4832cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpVisitedLHSKind: { 4833cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4834cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult RHS; 4835cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.swap(Result); 4836b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val); 4837cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4838b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4839cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4840cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4841cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4842cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis llvm_unreachable("Invalid Job::Kind!"); 4843cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4844cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4845cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4846cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAssignmentOp()) 4847cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4848cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4849cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E)) 4850cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E); 485154176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4852286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4853286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 48544087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48554087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 48564087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4857f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 48584087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4859745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4860745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 48614087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48624087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4863745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 48644087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48654087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48664087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 48671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 48684087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 48691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 48704087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 48714087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4873131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4874131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4875131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4877131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 48781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4879fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4880fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 48811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4882fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4883fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4884131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48854087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 48862de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4887131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4888131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4889131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48902de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4891131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4892131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4893131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4894131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48954087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48964087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4898286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4899286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4900286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 49011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4902745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4903745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4904286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 49051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4906745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4907286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 49081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4909286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4910529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4911286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4912286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4913b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 49142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4915131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 49162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4917131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 49182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4919131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 49202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 49211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4922131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 49232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4924131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 49252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 49261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4927fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4928fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4929286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4930286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 49311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4932ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4933625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4934745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4935745f5147e065900267c85a5568785a1991d4838fRichard Smith 4936745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4937745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 49383068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4939a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4940745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 49413068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4942a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4943625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4944625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4945625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 494665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 494765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 494865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 494965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 495065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 495165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 495265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 495365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 495465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 495565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 495665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 495765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 49585930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 49595930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 49605930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 49615930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 49621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 496365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 496465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 49659e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 49669e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 49675bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4968f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4969ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4970ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4971c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4972ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4973ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4974f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49759e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4976b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4977b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4978b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 497974f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 498074f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4981f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49829e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 49839e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 49849e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4985f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49869e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4987c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4988c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4989c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 49909e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 49915bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4992a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 499315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 499415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 499515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4996f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4997f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4998f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 49992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 5000f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 5001f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 5002f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 5003f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 5004f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 5005f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 5006f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 5007f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 5008f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 50094992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 50104992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 50113068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 5012180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 501374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 5014180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 5015a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 501615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 501715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 501815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 501915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 502015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 502115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 502215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 502315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 502415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 502515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 502615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 502715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 502815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 502915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 503015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 503115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 503215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 503315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 503415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 503515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 5036ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 5037625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 503882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 503982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 504082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 504182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 504282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 504382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 504482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 504582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 5046f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 504782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 504882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 5049f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 5050f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 5051f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 5052f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 5053f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 5054f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 5055f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 5056f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 5057f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 5058f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 5059f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 5060f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 5061f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 5062f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 5063f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 5064f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 5065f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 5066f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 5067f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 5068f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 5069f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 5070f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 5071f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 5072f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 5073f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 5074f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 5075f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 5076f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5077f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 5078f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 5079f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 5080f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5081f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 5082f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 5083f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 5084f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 5085f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 5086f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 5087f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 5088f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5089f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5090f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 5091a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // The comparison here must be unsigned, and performed with the same 5092a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // width as the pointer. 5093a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy); 5094a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareLHS = LHSOffset.getQuantity(); 5095a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareRHS = RHSOffset.getQuantity(); 5096a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman assert(PtrSize <= 64 && "Unexpected pointer width"); 5097a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t Mask = ~0ULL >> (64 - PtrSize); 5098a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareLHS &= Mask; 5099a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareRHS &= Mask; 5100a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman 51012850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // If there is a base and this is a relational operator, we can only 51022850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // compare pointers within the object in question; otherwise, the result 51032850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // depends on where the object is located in memory. 51042850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (!LHSValue.Base.isNull() && E->isRelationalOp()) { 51052850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman QualType BaseTy = getType(LHSValue.Base); 51062850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (BaseTy->isIncompleteType()) 51072850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 51082850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy); 51092850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman uint64_t OffsetLimit = Size.getQuantity(); 51102850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit) 51112850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 51122850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman } 51132850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman 5114625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 5115625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 5116a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LT: return Success(CompareLHS < CompareRHS, E); 5117a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GT: return Success(CompareLHS > CompareRHS, E); 5118a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LE: return Success(CompareLHS <= CompareRHS, E); 5119a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GE: return Success(CompareLHS >= CompareRHS, E); 5120a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_EQ: return Success(CompareLHS == CompareRHS, E); 5121a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_NE: return Success(CompareLHS != CompareRHS, E); 5122ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 51233068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 51243068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 5125b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5126b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 5127b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 5128b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 5129b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5130b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 5131b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5132b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 5133b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 5134b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5135b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5136b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 5137b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5138b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5139b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 5140b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 5141b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 5142b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 5143b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 5144b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5145b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5146b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5147b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 5148b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 5149b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 5150b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5151b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5152b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 5153b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5154b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5155b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5156b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 5157b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 5158b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 5159b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 5160b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 5161b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5162b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5163b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 516426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 516526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 516626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 516726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 516826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 516926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 517026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 517126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 517226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 517326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 5174cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert((!LHSTy->isIntegralOrEnumerationType() || 5175cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSTy->isIntegralOrEnumerationType()) && 5176cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis "DataRecursiveIntBinOpEvaluator should have handled integral types"); 5177cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't continue from here for non-integral types. 5178cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 5179a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 5180a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 51818b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 51825d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 51835d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 51845d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 51855d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 51869f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 51879f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 51889f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 51899f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 5190e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5191e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 51928b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 5193af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 5194af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5195af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 51961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 5197af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 51988b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 51998b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5200a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5201af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 52028b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 52038b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5204af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5205e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 5206e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5207e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5208e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5209f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 5210f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 5211f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 5212f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 5213f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 5214f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 5215e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 52164f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 5217e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 52184f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 5219e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 5220a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5221f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 5222f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 52230518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 5224f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 5225f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 5226a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5227f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 5228f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 5229f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5230f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5231f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5232f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5233f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5234f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5235f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5236f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5237f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5238f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5239f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5240f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5241f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5242f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5243f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5244180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 524574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5246f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5247180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5248f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5249f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5250f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5251f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5252fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5253fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 52548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 52558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 52568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 52578ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5258f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 52608ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 52618ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 52628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 52638ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 52648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 52658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 52668ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 52678ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 52688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 52698ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5270f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52718ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 52728ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 52738ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 52748ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52758ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5276f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52778ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 52788ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 52798ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5280f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5281f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52828ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 52838ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5284ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5285cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5286fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 52878ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 52888ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52898ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5290f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52918ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 52928ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5294cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5295cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5296cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5297f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5298cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5299cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5300cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5301f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5303cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 5304cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5305cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5306cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5307cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5308cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5309cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5310f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5311cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5312cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 53137c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5314cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5315cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 53168ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 53178ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 53188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 53198ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 53208ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5321b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 532275a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 53234c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 532475a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 532575a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5326f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 53272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 53284c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 53294c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5330f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 53312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5332c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5333f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5334f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5335f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5336f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5337f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5338789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5339789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5340789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5341789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5342789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5343f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5344f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5345f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5346f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5347f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5348f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5349f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5350f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5351f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5352f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5353f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5354f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5355f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 535606a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5357a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 53581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5359732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5360732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 53618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 53628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 536382206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5364b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 536582206e267ce6cc709797127616f64672d255b310Anders Carlsson 536646a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 536746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 536846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 536946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 537046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 537146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 537246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 537346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 537446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 537546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 537646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 537746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 53784d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 537946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 538046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 538146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 538246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 538346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 538446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 53851d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 53861d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 538746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 538846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 538946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 539046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 539146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 539246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 539346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 539446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 539546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 539646a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 539746a523285928aa07bf14803178dc04616ac85994Eli Friedman 5398e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 539946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 540046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 540133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 540233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 540333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 540433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5405ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5406f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 540746a523285928aa07bf14803178dc04616ac85994Eli Friedman 54087d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 540946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 54107a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 54117a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 541246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5413c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 541446a523285928aa07bf14803178dc04616ac85994Eli Friedman 541546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 541646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 541746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 541846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 541946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 542046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 54214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5422c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 54234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5424131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 54254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 54264efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 542746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5428732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5429b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5430a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5431be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 543265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 543365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 543465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 543565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 543665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 543765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 543865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5439be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5440be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5441be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 544230c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5443f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5444f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5445732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 54461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 544746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5448c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5449c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5450efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 545187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5452b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 54534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5454dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5455dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5456f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5457f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5458f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5459dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5460f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5461dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5462b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5463efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5464dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5465dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 54664efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5467a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5468a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5469f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 54702bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 54714efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 547246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5473f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 54741725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 54751725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 547646a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 54771725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 54782217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 547946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 548046a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 548146a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 548246a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5483732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5484c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5485c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5486c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5487c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 548846a523285928aa07bf14803178dc04616ac85994Eli Friedman } 548946a523285928aa07bf14803178dc04616ac85994Eli Friedman } 54901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 549146a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5492a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 54932bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5494722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5495722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5496f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5500f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5501722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5502722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5503722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5504722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5505722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5506722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5507664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5508722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5509f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5510f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5511f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5514722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5515722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5516722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 55178327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5518664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5519664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5520664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5521ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5522ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5523ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5524ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5525295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5526295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5527295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5528295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5529f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5530d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5531d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5532d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5533d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5534770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 55358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5536d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5537d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5538d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 55398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5540d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55411aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 55428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 55438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5545d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 554651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5547f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5548f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5549f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5550f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5551019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5552d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55535db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5554d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5555d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 55568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 55572217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5558abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5559abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5560ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 556151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5562d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5563d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5564d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5565d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5566c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 55678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5568d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5569d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55704ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5571db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5572db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5573db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5574db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5575db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5576db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5577db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5578db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5579db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5580db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5581db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5582db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5583db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5584db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5585db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5586db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5587db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5588db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5589db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5590db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5591db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5592db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5593db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5594db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5595019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5596180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 55978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 55988cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 55998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5600019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5601019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5602019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5603019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5604019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 56057cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 56067cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 56077cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 560834a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 560934a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 56107cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 56111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5612db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5613db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5614db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5615f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5617f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5618f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5619db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 56209e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 56219e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 56229e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 56234572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 56249e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5625f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 56295db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 56305db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 56315db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 56325db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 56335db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 56345db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 56351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56365db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 56375db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56385db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56395db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 56401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 56411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 56425db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 56435db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 56445db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 56455db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 56465db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 56475db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 56485db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56495db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5650019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5651019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5652019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5653abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 565443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 565543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 565643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 565743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 565843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 565943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 566043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 566143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 566243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5663abd3a857ace59100305790545d1baae5877b8945John McCall} 5664abd3a857ace59100305790545d1baae5877b8945John McCall 5665abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 566643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 566743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 566843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 566943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 567043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 567143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 567243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 567343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 56748327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 567543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 567643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5677abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5678abd3a857ace59100305790545d1baae5877b8945John McCall} 5679abd3a857ace59100305790545d1baae5877b8945John McCall 56805db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 56815db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5682f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 56832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 56847993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 56852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 56867993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 56877993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 56885db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56895db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56905db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 56915db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5692019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5693d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5694e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5695e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 569696e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 56975db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5698745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5699745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5700d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5701745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5702d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5703d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5704d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5705f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5707d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 57087b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5710d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 57117b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5713d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 57147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 57152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5716d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 57177b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5718d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 57197b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 57207b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 57217b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 57227b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5723d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5724d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5725d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5726d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5727d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5728d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5729d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 57308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 57318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 57321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57332a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 57342a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5735c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 57362a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57372a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 57384efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5739c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5740c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5741c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 57424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 57432a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57442a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 57454efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 57464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5747c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5748c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 57494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5750f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 57512a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5752f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5753f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5754f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5755f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5756f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5757f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 57582a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 57594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 57604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5761d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5762a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 57639ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 57649ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57659ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5766770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 57678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5768f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 57691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57709ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5771f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 57728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 57731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57741aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 57758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 57768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 57778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 57781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57797ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 57807ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 57818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 57838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57849ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 57868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5787b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 578896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 57897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5790b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5791b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 57921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5793b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5794b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5795c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 57968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5797b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5798b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 57997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5800f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 58017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 58027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 58037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 58047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 58057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 58067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 58077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 58087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 58097ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 58107ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 58117ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 58127ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 58137ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 58147ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 58158cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 58168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5817b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5818b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5819b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5820b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5821b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5822b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5823b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5824b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5825b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5826b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5827b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5828b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5829b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5830b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5831b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5832b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5833b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5834b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5835b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5836b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5837b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5838b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5839b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5841b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 58438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 58448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 58458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 58468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 58478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 58488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 58498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 58508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 58518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 58528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 58538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 58548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 58558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 58564d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 58578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 58588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 58598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 58608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 58618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 58628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 58638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 58648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 58658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 58668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 58678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 58688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 58691d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 58701d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 58718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 58728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 58738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 58748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 58758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 58768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 587733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 587833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 587933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 588033e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5881ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 58828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 58838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 58857a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 58867a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 58878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5888c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 58892bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 58908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 589146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 58928786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5893f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 58948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5896b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 58978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5898b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5899b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 59008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 59018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 59028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 59068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5913c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5914c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 59158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 59188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5925c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5926c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5927c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5928c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 59298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5932b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 59338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5934b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 59359ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 59368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 59378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 59388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 59428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5943b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5944ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 59458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59481725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5949f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5950f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 59518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 59558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5962c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5963c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5964c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5965c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 59668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5967ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 59681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 59698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 59709ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 59719ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5972f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 59742ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 59752ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5976745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5977745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5978f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 59791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5980f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5981745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5982f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5983a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 59843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 59853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5986ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5987f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 59882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5989a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5990a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5991a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5992a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5993a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5994a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5995a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5996a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5997a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 59983f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 59992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 6000a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 6001a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 6002a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 6003a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 6004a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 6005a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 6006a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 6007a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 6008a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 60093f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 60102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 60113f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 6012f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 60133f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 60143f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 60153f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 60163f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 60171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 60183f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 60193f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 60203f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 60213f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 60223f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 60233f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 60243f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 60253f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 60263f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 60273f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 60283f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 60293f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 60303f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 60313f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 6032f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 60331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 60343f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 60353f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 60361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 60373f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 60383f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 60393f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 60403f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 604196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 604296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 604396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 604496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 604596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 604696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 604796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 604896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 604996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 605096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 605196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 605296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 605396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 605496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 605596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 605696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 605796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 605896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 605996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 606096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 606196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 606296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 606396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 606496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 606596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 606696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 606796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 606896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 606996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 607096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 6071f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 6072f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 6073f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 607496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 607596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 607696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 607796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 607896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 607996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 608096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 608196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 608296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 608396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 608496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 6085ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 6086ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 6087f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 6088ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 6089ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 609096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 609196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 609296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 609396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 609496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 609596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 609696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 6097f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 609896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 609996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 610096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 610196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 610296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 610396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 610496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 610596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 610696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 610796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 610896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 610996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 611096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 611196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 611296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 611396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 611496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 611596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 611696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 611796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 611896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 611996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 612096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 612196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 61227ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 61237ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 61247ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 61257ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 61267ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 61277ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61287ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 61297ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61307ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 61317ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 61327ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 61337ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61347ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 61357ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61367ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61377ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 61387ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61397ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 61407ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 61417ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 61429ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 6143aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 6144aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 6145aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 6146aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6147aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 6148aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 6149aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 6150aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 6151aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 6152aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 61531aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { return true; } 6154aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6155aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 6156aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 6157aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 6158aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 6159aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 6160aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 6161aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 6162aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6163aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6164aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 6165aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 6166aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6167aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 6168aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 6169aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 6170aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 6171aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6172aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 617351f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 6174f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 6175f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 61761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { 6177c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 6178c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 6179c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 6180c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 6181c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 6182c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6183c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 6184c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 61851e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 618659b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 6187575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 61881e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 61896dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 6190efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 6191efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 6192efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 61936dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61941e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 6195efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 6196efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 6197efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 61986dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61991aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(F); 6200efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 6201efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 6202efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 6203660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 62041e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 620569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 6206e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 6207e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 6208e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 6209e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 6210e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 621151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 6212180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 621383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6214180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6215cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 6216180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 621751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 6218180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 621983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6220180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6221180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 6222180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 6223aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 6224c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 62255cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_nonliteral) 6226c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 6227c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 62285cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 6229aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6230aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 6231c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 62325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) << E->getType(); 6233c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6234f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 62355cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 6236660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6237f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6238660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6239660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6240660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6241660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 624283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 624383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 624483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 624583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 624683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 624783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 62487ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 624951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 625051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 625151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 625269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 625369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6254180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6255180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6256180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6257180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 625869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 625969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 626069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 62611aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return Evaluate(Result, Info, E); 626269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 626369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6265f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6266f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 626751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 626851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 626951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 62701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!::Evaluate(Result, Info, E)) 6271f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6272f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6273f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6274f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 62751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.setFrom(Info.Ctx, Result); 62761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) 6277f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6278f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6279f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 62801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith // Check this core constant expression is a constant expression. 628183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6282f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6283c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 628451f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 628556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 628656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6287c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6288c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 628951f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6290ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6291ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6292ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6293ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6294ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6295ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6296ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6297ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 62982d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 62992d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 63014e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 63021445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 63031445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6304f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6305f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 630656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 630756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 63084ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 63094ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6310c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 631151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 63121aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith HandleConversionToBool(Scratch.Val, Result); 6313cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6314cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 631580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 631680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 631780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 631880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 631980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6320c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 632180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 632280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6323c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6324f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6325c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6326c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6327a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6328a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 63294ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 63301b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 63311b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6332efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 633383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 633483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 633583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 633683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 633783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 63381aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.moveInto(Result.Val); 633983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6340b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6341b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6342099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6343099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6344099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 63452d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 63462d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 63472d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 63484e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 63492d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 63502d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6351099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6352099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6353099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6354099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6355099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6356099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6357099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6358099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6359099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 636051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 636151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 636251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 636351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 63644e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() && 636551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 636651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 636783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 636883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 636951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 637051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 637151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 637283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 637383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 637483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 637583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 637683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 637783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 637883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6379099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6380099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 638151f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 638251f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 63834ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 63844fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 638551f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 638645b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 638751fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 63884ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 63891e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6390393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6391393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6392a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 63931c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 639451f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6395c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 639651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 63971c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 639851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 63991c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 640051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6402e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6403e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6404e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6405e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6406e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6407e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6408d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6409d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6410d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6411d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6412d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6413d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6414d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6415d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6416d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6417d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6418d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6419d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6420d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6421d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6422d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6423d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6424d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 642651f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6427d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6428d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6429d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6430d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6431d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64323c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 64333c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6435d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6436d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6437d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6438d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6439d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6440d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6441d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6442d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64433c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 64443c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 64453c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6446d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6447d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6448d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 644951f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6450d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6451d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6453d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6455d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6456d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 64582ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6459d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6460d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6461d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6462d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 646363c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6464d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6465d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6466d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6467d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6468d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6469d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6470d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6473d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6474d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6476d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6477d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6478d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6479d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6480d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6483e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6484d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6485d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 64869be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6487d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 64889fcce65e7e1307b5b8da9be13e4092d6bb94dc1dRichard Smith case Expr::UserDefinedLiteralClass: 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6490d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6495d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6496d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6497d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 64984765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6500d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6501d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6502d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6503d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6504eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard case Expr::ObjCBoxedExprClass: 6505ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCArrayLiteralClass: 6506ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCDictionaryLiteralClass: 6507d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6508d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6509d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6510d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6511d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6512d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6513ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCSubscriptRefExprClass: 6514d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6515d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6516d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6517d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 65187cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6519be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6520c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 652161eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6522f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 652303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 65244b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6525276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6526cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 652701d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6528cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6529cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6530ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6531d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 653591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 653691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 653791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 653891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6539d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6540d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6541f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6542f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6543d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6544d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6545ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCBoolLiteralExprClass: 6546d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6547ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6548d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 65496ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 65504ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor case Expr::TypeTraitExprClass: 655121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6552552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 65532e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6554d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6555d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 65566cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 655705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 655805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 655905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6560d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6561180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6562d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6563d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6564d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6565359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith case Expr::DeclRefExprClass: { 6566d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6568359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith const ValueDecl *D = dyn_cast<ValueDecl>(cast<DeclRefExpr>(E)->getDecl()); 65694e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && 6570359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith D && IsConstNonVolatile(D->getType())) { 6571d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6572d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6573d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6574d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6575d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6576d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6577d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6578d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6579d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6580d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6581db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6582db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6583db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6584099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6585099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6586099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6587099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6588099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6589099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6590099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6591d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6592d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6593d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6594359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith } 6595d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6596d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6597d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 65982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 65992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 66002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 66012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 66022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 66032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 660405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 660505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 660605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6607d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 66082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 66092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 66102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 66112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 66122de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 66132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 66142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6617d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6618d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6619d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6620d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6621d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 662251f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 662305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6624d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6625d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6626d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6627d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6628d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6629f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6630f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6631f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6632f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6633d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6634d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6635d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6636d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6637d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6638d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 66392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 66402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 66412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 66422de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 66432de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 66442de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 66452de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 66462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 66472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 66482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 66492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 66502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 66512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 665205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 665305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 665405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6655d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6656d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 66572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 66582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 66592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 66602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 66612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 66622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 66632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 66642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 66652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 66662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 66672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 66682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 66692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 66702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 66712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 66722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 66732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6674d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6675d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 66762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 66772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 667851f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6679d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 66803b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6681a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6682d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6683d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6684d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6685a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6686d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6687d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6688d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6689d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6690d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 66912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 66924e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().C99) { 6693d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6694d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6695d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6696d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6697d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6698d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6699d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6700d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6701d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6702d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6703d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6704d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6705d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 67062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 67072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6708d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6709d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6710d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6711d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6712d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6713d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 67142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6715a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6716d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6717d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6718d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6719d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6720d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6721d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6722d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6723d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6724d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6725d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6726d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6727d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6728d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6729d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6730d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 673132cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6732f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6733d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 67342116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 67352116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 67362116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 67372116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 67382116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 67392116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 67402116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 67412116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 67422116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 67432116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 67442116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 67452116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 67462116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 67472116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 67482116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 67492116b144cf07f2574d20517187eb8863645376ebRichard Smith } 67502116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6751eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6752eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 67537a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 67547a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6755eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6756eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6757eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6758d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6759eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6760eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6761eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6762d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 676356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 676456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 676556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 676656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 676756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 676856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 676956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 677056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6771a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 677256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 677356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6774d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6775d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6776d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6777d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6778d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6779d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6780d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6781d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 678280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 678380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6784d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6785d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6786d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 678763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6788f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6789f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 679063fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6791d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6792d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6793d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6794d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6795d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6796d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6797d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6798d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6799d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6800d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6801d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6802a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6803d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6804d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6805d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6806d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6807d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6808d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6809d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6810d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6811d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6812d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6813d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 68143026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6815d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6816d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6817f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6818f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6819f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6820f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6821f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6822f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6823f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6824f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6825f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6826f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 68274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 68284c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6829dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6830dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 68314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 68324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6833dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6834f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6835f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6836dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 68374e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6838f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6839f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6840d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6841d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6842d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6843d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6844d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6845f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6846f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6847f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6848f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6849f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 68504e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6851f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6853f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6854f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6855f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6856d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6857d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6858d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 68594c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 686070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 686170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 686270488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 686370488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 68644c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 68654c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 68664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 68674c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 68684e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie assert(Ctx.getLangOpts().CPlusPlus); 68694c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 687070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 68714c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 68724c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 68734c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 68744c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 68754c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68764c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 68774c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 68784c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68794c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 68804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 68814c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 68824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 68834c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 68844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 68854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 68864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 68884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6889745f5147e065900267c85a5568785a1991d4838fRichard Smith 6890745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6891745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6892745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6893745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6894745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6895745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6896745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6897745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6898745f5147e065900267c85a5568785a1991d4838fRichard Smith 6899745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6900745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6901745f5147e065900267c85a5568785a1991d4838fRichard Smith 6902745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6903745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6904745f5147e065900267c85a5568785a1991d4838fRichard Smith 6905745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6906745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6907745f5147e065900267c85a5568785a1991d4838fRichard Smith 6908745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6909745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6910745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6911745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 691283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6913745f5147e065900267c85a5568785a1991d4838fRichard Smith 6914745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6915745f5147e065900267c85a5568785a1991d4838fRichard Smith 6916745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6917745f5147e065900267c85a5568785a1991d4838fRichard Smith 69181aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 69191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 6920745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 69211aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 6922745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6923745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6924745f5147e065900267c85a5568785a1991d4838fRichard Smith 6925745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6926745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6927