ExprConstant.cpp revision 48def65d1cfbd020c5d4a7e542a00d63808c6060
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 290f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman // Note that we intentionally use std::map here so that references to 291f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman // values are stable. 292f6172aee547241427e6dabdd0bd6fcaf1c046689Eli Friedman typedef std::map<const Expr*, APValue> MapTy; 293bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 294bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 295bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 296bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 29708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 29808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 2991aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments); 300bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 301bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 302bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 303dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 304dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 305dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 306dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 307dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 308dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 309dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 310dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 311dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 312dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 313dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 314dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 315dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 316dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 317789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 318789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 319789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 320789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 321789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 322789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 323789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 324789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 325789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 326789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 327789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 328789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 329789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 330789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 331789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 332789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 333789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 334789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 335dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 336dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 33783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 34183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 34383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 34483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 34583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 34683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 34783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 34883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 34983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 35083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 351c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 352dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 353d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis 3541e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 3551e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 356f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 357d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 358bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 359d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 360d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 361d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 362d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 36383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 36483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 36583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 366bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 367745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 368bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 369bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 370180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 371180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 372180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 373180f47959a066795cc0f409433023af448bb0328Richard Smith 374180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 375180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 376180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 377180f47959a066795cc0f409433023af448bb0328Richard Smith 378c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 379c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 380c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 381c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 382745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 383745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 384745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 385745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 386745f5147e065900267c85a5568785a1991d4838fRichard Smith 387bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 388dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 38983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 39083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 391745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 392649dfbc389671d0c852ead5953da630d675a5d43Argyrios Kyrtzidis CheckingPotentialConstantExpression(false) {} 393bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 394180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 395180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 396180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 397180f47959a066795cc0f409433023af448bb0328Richard Smith } 398180f47959a066795cc0f409433023af448bb0328Richard Smith 3994e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &getLangOpts() const { return Ctx.getLangOpts(); } 400c18c42345636e2866fed75c7e434fb659d747672Richard Smith 401c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 402745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 403745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 404745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 405745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 40683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 40783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 40883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 40983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 41083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 411c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 412c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 413c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 414c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 415c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 416c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 417f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 41883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 41983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 42083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 42183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 42283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 42383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 42483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 42583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 42683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 42783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 428c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 429c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 430c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 431c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 432c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 433c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 434c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 435c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 43608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 43708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 43808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 440f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 4417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 4427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 443c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 444f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 445f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 446f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 447dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 44808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 44908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 45008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 45108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 452745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 453745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 45408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 455c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 456dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 45708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 45808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 459745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 460745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 46108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 462dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 463c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 464dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 465dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 466dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 4675cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic Diag(const Expr *E, diag::kind DiagId 4685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith = diag::note_invalid_subexpr_in_const_expr, 4695cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith unsigned ExtraNotes = 0) { 4705cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (EvalStatus.Diag) 4715cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Diag(E->getExprLoc(), DiagId, ExtraNotes); 4725cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith HasActiveDiagnostic = false; 4735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return OptionalDiagnostic(); 4745cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith } 4755cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith 476dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 477dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 4785cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith template<typename LocArg> 4795cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith OptionalDiagnostic CCEDiag(LocArg Loc, diag::kind DiagId 4807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 482dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 48351e47df5a57430f1b691b04258e663cce68aef9dEli Friedman if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) { 48451e47df5a57430f1b691b04258e663cce68aef9dEli Friedman HasActiveDiagnostic = false; 485dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 48651e47df5a57430f1b691b04258e663cce68aef9dEli Friedman } 487c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 488c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 489c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 490c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 491c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 492c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 493c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 494c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 495f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 496099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 497099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 498099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 499099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 500099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 501099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 502099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 503099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 504745f5147e065900267c85a5568785a1991d4838fRichard Smith 505745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 506745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 507745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 50874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 50974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 510745f5147e065900267c85a5568785a1991d4838fRichard Smith } 511c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 512f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 513f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 514f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 515f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 516f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 517f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 518f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 519f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 520f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 521f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 522f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 523f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 524f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 525f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 526f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 527f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 52874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 52974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 53074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 53174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 53274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 53374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 53474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 53574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 53674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 53774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 53874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 53974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 54074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 54174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 54274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 54374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 54474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 54574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 54608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 54708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 548b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 549b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 550b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 551b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 552b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 5535cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) 554b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 555b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 556b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 557b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 558b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 559b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 560b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 561b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 562b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 563b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 5645cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 566b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 5685cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_array_index) 569b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 570b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 571b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 572b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 57308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 57408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 5751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue *Arguments) 57608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 57783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 57808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 57908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 58008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 58108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 58208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 58308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 58408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 58508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 58608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 58787eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 58808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 58908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 59008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 59108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 5925ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 5935ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 59408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 59608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 59708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 59808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 59908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6005fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 60108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 6041aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const APValue &Arg = Frame->Arguments[ArgIndex]; 6051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 60608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 60708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 60808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 609bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 610d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 61108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 61208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 61308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 61408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 61508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 61608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 61708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 61808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 61908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 62008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 62108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 62208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 62308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 62408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 62508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 62608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 62708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 62808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 63308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 641bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 643d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 645f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 646f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 647f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 648f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 649f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 650f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 651f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 652f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 653f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 654f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 655f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 656f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 657f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 658f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 659f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 660f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 661f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 662f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 663f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 664f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 6651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &v) const { 666f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 6671aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(FloatReal, FloatImag); 668f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 6691aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith v = APValue(IntReal, IntImag); 670f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 6711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &v) { 67256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 67356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 67456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 67556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 67656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 67756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 67856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 67956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 68056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 68156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 68256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 683f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 684efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 685efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 6861bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 687efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 68883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 6890a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 690efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 69247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 693625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 69483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 6950a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 6960a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 697efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 6981aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 6991aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (Designator.Invalid) 7001aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, APValue::NoLValuePath(), CallIndex); 7011aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 7021aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(Base, Offset, Designator.Entries, 7031aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator.IsOnePastTheEnd, CallIndex); 704efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 7051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(ASTContext &Ctx, const APValue &V) { 70647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 70747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 70847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 70983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7101aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Designator = SubobjectDesignator(Ctx, V); 7110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 71383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 71683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 717b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 718b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 719b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 720b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 721b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 722b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 723b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 724b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 725b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 726b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 7275cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_null_subobject) 728b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 729b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 730b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 731b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 732b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 733b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 734b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 735b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 736b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 737b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 7385cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // Outside C++11, do not build a designator referring to a subobject of 7395cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith // any object: we won't use such a designator for anything. 7405cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (!Info.getLangOpts().CPlusPlus0x) 7415cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.setInvalid(); 742b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 743b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 744b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 745b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 746b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 747b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 7485cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) 7495cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addDeclUnchecked(D, Virtual); 750b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 751b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 7525cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, CSK_ArrayToPointer)) 7535cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addArrayUnchecked(CAT); 754b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 75586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 7565cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) 7575cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.addComplexUnchecked(EltTy, Imag); 75886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 7605cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith if (checkNullPointer(Info, E, CSK_ArrayIndex)) 7615cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Designator.adjustIndex(Info, E, N); 76256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 763efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 764e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 765e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 766e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 767e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 768e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 769e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 770e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 771e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 772e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 773e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 774e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 775e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 778e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 779e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 781e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 784e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 7851aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void moveInto(APValue &V) const { 7861aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith V = APValue(getDecl(), isDerivedMember(), Path); 787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 7881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith void setFrom(const APValue &V) { 789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 817e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 818e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 819e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 820e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 821e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 853c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 854b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 855b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 856b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 857b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 858b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 859b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 860b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 861b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 862b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 863c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 864c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 865c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 866c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 867c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 868c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 869f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 87087eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 8711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); 87283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 87383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 87483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 87583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 876efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 877efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 88187eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 8821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 883d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 884d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 885f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 886f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 887f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 8884efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 8894efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 8904efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 891180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 892180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 893180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 894180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 895180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 896180f47959a066795cc0f409433023af448bb0328Richard Smith} 897180f47959a066795cc0f409433023af448bb0328Richard Smith 8981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 899180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 900180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 901180f47959a066795cc0f409433023af448bb0328Richard Smith 902180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 903180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9041bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 90542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9061bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 907180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9081bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 90942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9101bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 91242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9131bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 918b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 919b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 920b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 921b78ae9716576399145786b93f687943f8b197170Richard Smith } 922180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 923180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 924180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 925180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 926180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 92747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 928e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet case Expr::CXXUuidofExprClass: 929180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 930180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 931180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 932180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 933180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 934180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 935180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 936180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 937180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 938180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 939745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 940745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 941745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 942745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 943745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 944745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 945745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 946745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 947180f47959a066795cc0f409433023af448bb0328Richard Smith } 94842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 94942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 95083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 95183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 95283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 95383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 95483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 95583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 956890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek Info.Note(Base.get<const Expr*>()->getExprLoc(), 95783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 95883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 95983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 9609a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 9611aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// value for an address or reference constant expression. Return true if we 9621aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith/// can fold this expression, whether or not it's a constant expression. 96383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 96483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 96583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 96683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 967c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 968c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 969c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 970b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 971b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 972b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 973c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 974c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 975c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 97683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 97783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 97883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 97983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 980c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 98183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 982c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 98361e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 98469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 985f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 98683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 98783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 98883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 989b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 99048def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg // Check if this is a thread-local variable. 99148def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) { 99248def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (const VarDecl *Var = dyn_cast<const VarDecl>(VD)) { 99348def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg if (Var->isThreadSpecified()) 99448def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg return false; 99548def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg } 99648def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg } 99748def65d1cfbd020c5d4a7e542a00d63808c6060Hans Wennborg 998b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 999b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1001b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1003b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 100683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 100761e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1010c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1011b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1012c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 101383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1014c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 101583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1016c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1017c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 101869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 101947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 102047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 102151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 102251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 102351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 102451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 102551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 102651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 102751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 102851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 10295cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) 103051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 103151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 10325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 103351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 103451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 103551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10369a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 103783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 103883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 103983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 104083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 104183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 104283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 104383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 104783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 104883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 104983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 105083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 105283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 105383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 105483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 105583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 105783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 105883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 105983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 106083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 106183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 106283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 106483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 106683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 106783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 106883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 106983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 107383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 1074262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 1075262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Value.getStructField(I->getFieldIndex()))) 107683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 107783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 107983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 108183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 10821aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LVal.setFrom(Info.Ctx, Value); 108383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 10849a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 108583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 108683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 10889a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 10899a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 10909e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 10911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 10929e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10939e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 10949e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 109583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 10969e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 10979e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 109865ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 109965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11000dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 110165ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 110265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 11031aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { 11043554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11053554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1106e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1107e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11083554283157190e67918fad4221a5e6faf9317362John McCall return true; 11093554283157190e67918fad4221a5e6faf9317362John McCall } 11103554283157190e67918fad4221a5e6faf9317362John McCall 1111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1112e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11133554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1114e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11150dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11165bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11175bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 11181aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool HandleConversionToBool(const APValue &Val, bool &Result) { 1119c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1120c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1121c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1122c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1123c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 112441bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1125c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1126c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1127a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1128c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1129c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1130c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1131c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1133c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1134c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1135436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1136e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1137e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1138e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1140e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1141c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1142cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1143180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1144180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 114565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1146c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1149c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1151c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1152c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1153c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1154c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 11551aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 1156d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis if (!Evaluate(Val, Info, E)) 1157c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1158d411a4b23077b29e19c9371bbb19b054a374d922Argyrios Kyrtzidis return HandleConversionToBool(Val, Result); 11594efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 11604efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1161c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 116226dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedmanstatic void HandleOverflow(EvalInfo &Info, const Expr *E, 1163c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 116426dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman Info.CCEDiag(E, diag::note_constexpr_overflow) 1165789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1166c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1167c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1168c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1169c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1170c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1171c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1172a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1173575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 11741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1175c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1176a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1177c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1178c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 117926dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1180c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1181a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1182a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1183c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1184c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1185c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1186c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1187a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1188c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1189c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1190c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 119126dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1192c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1193a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1194a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1195f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1196f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1197f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1198f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1199a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1200a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1201a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12029f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1203575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1204a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1205a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1206a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1207c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1208c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1209c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1210c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1211c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1212c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1213c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 121426dc97cbeba8ced19972a259720a71aefa01ef43Eli Friedman HandleOverflow(Info, E, Value, DestType); 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1216a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1217a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1218e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1219e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 12201aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue SVal; 1221e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1222e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1223e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1224e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1225e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1226e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1227e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1228e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1229e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1230e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1231e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1232e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1233e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1234e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1235e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1236e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1237e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1238e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1239e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1240e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1241e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1242e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1243e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1244e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1245e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1246e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1247e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 12485cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1249e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1250e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1251e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1252e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1253e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1254e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1255e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1256e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1257e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1258e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1259e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1260e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 12615cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1262e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1263e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1264e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1265b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1266b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1267b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1268b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1269b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1270b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1271180f47959a066795cc0f409433023af448bb0328Richard Smith 1272b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1273b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1274b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1278180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1279180f47959a066795cc0f409433023af448bb0328Richard Smith 1280b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1281e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1282e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 12838d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 1284180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1285180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1286e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1287180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1288e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1289180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1290180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1291180f47959a066795cc0f409433023af448bb0328Richard Smith } 1292e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1293180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1294180f47959a066795cc0f409433023af448bb0328Richard Smith} 1295180f47959a066795cc0f409433023af448bb0328Richard Smith 12968d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1297180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1298180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1299180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 13008d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!RL) { 13018d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (Derived->isInvalidDecl()) return false; 13028d59deec807ed53efcd07855199cdc9c979f447fJohn McCall RL = &Info.Ctx.getASTRecordLayout(Derived); 13038d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 13048d59deec807ed53efcd07855199cdc9c979f447fJohn McCall 1305180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1306b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 13078d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1308180f47959a066795cc0f409433023af448bb0328Richard Smith} 1309180f47959a066795cc0f409433023af448bb0328Richard Smith 1310b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1311180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1312180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1313180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1314180f47959a066795cc0f409433023af448bb0328Richard Smith 13158d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!Base->isVirtual()) 13168d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1317180f47959a066795cc0f409433023af448bb0328Richard Smith 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1320b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1322180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1323b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1325180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1326180f47959a066795cc0f409433023af448bb0328Richard Smith 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 13288d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (DerivedDecl->isInvalidDecl()) return false; 1329180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1330180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1331b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1332180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1333180f47959a066795cc0f409433023af448bb0328Richard Smith} 1334180f47959a066795cc0f409433023af448bb0328Richard Smith 1335180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1336180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 13378d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1338180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1339180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 13408d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!RL) { 13418d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (FD->getParent()->isInvalidDecl()) return false; 1342180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 13438d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 1344180f47959a066795cc0f409433023af448bb0328Richard Smith 1345180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1346180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1347b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 13488d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1349180f47959a066795cc0f409433023af448bb0328Richard Smith} 1350180f47959a066795cc0f409433023af448bb0328Richard Smith 1351d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 13528d59deec807ed53efcd07855199cdc9c979f447fJohn McCallstatic bool HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1353d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1354d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1355d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1356d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 13578d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C))) 13588d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 13598d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return true; 1360d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1361d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1362180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 136374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 136474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1365180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1366180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1367180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1368180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1369180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1370180f47959a066795cc0f409433023af448bb0328Richard Smith } 1371180f47959a066795cc0f409433023af448bb0328Richard Smith 1372180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1373180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 137474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 137574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1376180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1377180f47959a066795cc0f409433023af448bb0328Richard Smith } 1378180f47959a066795cc0f409433023af448bb0328Richard Smith 1379180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1380180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1381180f47959a066795cc0f409433023af448bb0328Richard Smith} 1382180f47959a066795cc0f409433023af448bb0328Richard Smith 1383180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1384180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1385b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1386180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1387180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1388180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1389b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1390b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1391b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1392180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 139374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1394180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1395180f47959a066795cc0f409433023af448bb0328Richard Smith 1396180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1397180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1398b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1399180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1400180f47959a066795cc0f409433023af448bb0328Richard Smith} 1401180f47959a066795cc0f409433023af448bb0328Richard Smith 140286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 140386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 140486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 140586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 140686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 140786024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 140886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 140986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 141086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 141186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 141286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 141386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 141486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 141586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 141686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 141786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 141886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 141986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 142003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1421f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 14231aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith CallStackFrame *Frame, APValue &Result) { 1424d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1425d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1426d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1427745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1428745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1429745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1430745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 14325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1433177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1434f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1435177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1436177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1437d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 143803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1439099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1440099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1441099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1442745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1443745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1444745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 14455cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 1446099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1447099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1448099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1449180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1450180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1451180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 14521aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *Info.EvaluatingDeclValue; 1453180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1454180f47959a066795cc0f409433023af448bb0328Richard Smith } 1455180f47959a066795cc0f409433023af448bb0328Richard Smith 145665ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 145765ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1458f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 14595cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 146065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1461f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 146265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1463099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1464099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1465099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1466099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 14675cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_var_init_non_constant, 1468099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1469099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1470099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 147147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1472099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 14735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, 1474099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1475099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1476099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1477f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 147803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 14791aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = *VD->getEvaluatedValue(); 148047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 148103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 148203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1483c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 148403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 148503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 148603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 148703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 148859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 148959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 149059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 149159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 149259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 149359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 149459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 149559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 149659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 149759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 149859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 149959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 150059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 150159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 150259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1503fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// Extract the value of a character from a string literal. CharType is used to 1504fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// determine the expected signedness of the result -- a string literal used to 1505fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// initialize an array of 'signed char' or 'unsigned char' might contain chars 1506fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith/// of the wrong signedness. 1507f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1508fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith uint64_t Index, QualType CharType) { 1509f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1510f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1511f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1512fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith assert(CharType->isIntegerType() && "unexpected character type"); 1513f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1514f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1515fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith CharType->isUnsignedIntegerType()); 1516f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1517f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1518f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1519f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1520f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1521cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1522f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 15231aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Obj, QualType ObjType, 1524cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1525b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1526b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1527cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1528b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15295cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1530aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1531aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1534f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1535cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1536745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1537745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1538745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1539cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 15400069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue *O = &Obj; 1541180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1542cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1543cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1544180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1545cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1546f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1547cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1548f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15497098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15515cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 1552aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1553aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1554cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1555f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1556f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1557f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1558f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1559f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1560f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 15611aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(ExtractStringLiteralCharacter( 1562fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith Info, O->getLValueBase().get<const Expr*>(), Index, SubType)); 1563f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1564f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1565cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1566cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1567cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1568cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 156986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 157086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 157186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 157286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 15735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, Info.getLangOpts().CPlusPlus0x ? 157486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 157586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 157686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 157786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 157886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 157986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 15801aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexIntImag() 158186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 158286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 158386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 15841aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Obj = APValue(Index ? O->getComplexFloatImag() 158586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 158686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 158786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1588180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1589b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 15905cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_mutable, 1) 1591b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1592b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1593b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1594b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1595b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1596180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1597180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1598180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1599180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1600180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1601f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 16025cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_inactive_union_member) 16037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1604180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1605f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1606180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1607180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1608180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1609180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16145cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_ltor_volatile_obj, 1) 16157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16167098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16185cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 16197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1622cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1623180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 162459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 162559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 162659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 162759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1628cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1629180f47959a066795cc0f409433023af448bb0328Richard Smith 1630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1631745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 16325cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_read_uninit); 1633180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1634f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1635cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1636cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 16370069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // This may look super-stupid, but it serves an important purpose: if we just 16380069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // swapped Obj and *O, we'd create an object which had itself as a subobject. 16390069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // To avoid the leak, we ensure that Tmp ends up owning the original complete 16400069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith // object, which is destroyed by Tmp's destructor. 16410069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith APValue Tmp; 16420069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith O->swap(Tmp); 16430069b84c2aa7cc39263e85997b7cb1ed0b132ccdRichard Smith Obj.swap(Tmp); 1644cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1645cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1646cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1647f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1648f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1649f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1650f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1651f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1652f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1653f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1654f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 165586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 165686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1657f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1658f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1659f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1660f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1661f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 166286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 166386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 166486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 166586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1666f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1667f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1668f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1669f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1670f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1671f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1672f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1673f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1674f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1675f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1676f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1677f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1678f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1679f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1696f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1697f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1698f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1699f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1700f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1701f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1704180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1705180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1706180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1707180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1708180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1709f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1710f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17119ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17129ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1713180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1714180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1715f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1716f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 17171aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith const LValue &LVal, APValue &RVal) { 1718b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1719b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1720b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1721b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17221bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 1723c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1724f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1725f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17265cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 17277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 173083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 173183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 173283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 173383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 17345cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 173583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 173683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 173783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 173983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17465cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_type) << Type; 17477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17485cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1750f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1751c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17521bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1753c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1754c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1755d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1756d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1757c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1758c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1759d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (VD) { 1760d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) 1761d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor VD = VDef; 1762d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor } 1763f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 17645cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1766f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1767f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 17687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 17697098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 17701bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 17717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 17727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17735cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 17747098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17757098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17765cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 1777f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 17787098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 17827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 17875cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_const_int, 1) << VD; 17887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 17897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 17905cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 17917098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17927098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17937098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17947098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 17957098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 17967098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 17977098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 17987098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 17995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(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.CCEDiag(Conv); 18037098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18047098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 18067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 18075cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18105cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18120a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1813f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1816f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1817c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1818c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 181947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1820f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1821c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1823c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1824c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1825c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1826c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18270a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 183083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 183183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 183283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 183383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 18345cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_lifetime_ended, 1) << !Base; 183583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 183683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 183783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 183883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 183983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 184083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1841c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1842c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18465cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18495cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv); 18507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1854177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1855cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1856cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1857177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1858cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1859cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1860cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1861cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1862cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1863c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1864cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1865cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1866f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1867f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1868f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1869f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 18701aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RVal = APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0); 1871f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 18725cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(Conv, diag::note_invalid_subexpr_in_const_expr); 1873cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1874f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1875c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1876f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1877f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1878c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1879c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 188059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 188159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 188259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 188359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 188459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 188559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 188659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 188759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 188859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1912745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1913745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1914e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1915e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1916e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1917e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1919e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1922e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1923e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1924e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1925745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1926745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1927745f5147e065900267c85a5568785a1991d4838fRichard Smith 1928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1932b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1946b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1947b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1948b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1952e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 19638d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, BO, LV, RD, Base)) 19648d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 1965e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 1966e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 19688d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord())) 19698d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 1970e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1971e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 1973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 19748d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) { 19758d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, BO, LV, FD)) 19768d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 19778d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } else if (const IndirectFieldDecl *IFD = 19788d59deec807ed53efcd07855199cdc9c979f447fJohn McCall dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) { 19798d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueIndirectMember(Info, BO, LV, IFD)) 19808d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return 0; 19818d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } else { 1982d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 19838d59deec807ed53efcd07855199cdc9c979f447fJohn McCall } 1984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 1987e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1988e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1989e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 1990e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 1991e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 1992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 1993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 1994b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 1995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 2000b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2001b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 2002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 20035cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2004b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2005b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 2006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2007b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2008b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 2009b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 2010b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 2011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 2012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2013b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2014b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2015b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2016e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2017b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 20185cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) 2019b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2020e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2021b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2022e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2023e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2024b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 202559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 202659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2027c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2028d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2029d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2030d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2031d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2032d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2033d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2034d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2035d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2036d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2037d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2038d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 20391aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic EvalStmtResult EvaluateStmt(APValue &Result, EvalInfo &Info, 2040d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2041d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2042d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2043d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2044d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2045d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2048d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2049c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2050c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 205183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2052c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2053c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2054c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2055d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2056d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2057d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2058d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2059d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2060d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2061d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2062d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2063d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2064d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2065d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2066d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2067d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2068d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 20696180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 20706180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 20716180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 20726180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 20736180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 207451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 207551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 20766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 20776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 20786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 20794c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 20804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 20814c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 20824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 20836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 20844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 20854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 20864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 20874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 20884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 20896180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 20906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 20916180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20926180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 20936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 20946180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 20956180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2096c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2097c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2098c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2099c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2100c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2101745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2102745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2103745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2104745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2105745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2106745f5147e065900267c85a5568785a1991d4838fRichard Smith 2107c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2108c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2109c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2110c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2111c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2112c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2113099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2114099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2115c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2116c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2117c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2118c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2119c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2120c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2121c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2122c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2123c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2124c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2125180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 21261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithtypedef SmallVector<APValue, 8> ArgVector; 2127180f47959a066795cc0f409433023af448bb0328Richard Smith} 2128180f47959a066795cc0f409433023af448bb0328Richard Smith 2129180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2130180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2131180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2132745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2133180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2134745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2135745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2136745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2137745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2138745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2139745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2140745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2141745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2142745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2143745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2144180f47959a066795cc0f409433023af448bb0328Richard Smith} 2145180f47959a066795cc0f409433023af448bb0328Richard Smith 2146d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2147745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2148745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2149f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 21501aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith EvalInfo &Info, APValue &Result) { 2151180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2152180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2153180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2154d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2155745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2156745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2157745f5147e065900267c85a5568785a1991d4838fRichard Smith 2158745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2159d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2160d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2161d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2162180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2163745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 216459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2165180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 216651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2167180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2168180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2169180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2170180f47959a066795cc0f409433023af448bb0328Richard Smith 2171745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2172745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2173745f5147e065900267c85a5568785a1991d4838fRichard Smith 217486c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 217586c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 217686c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 217786c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 217886c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 217986c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2180745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2181180f47959a066795cc0f409433023af448bb0328Richard Smith 2182180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2183180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2184180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 218583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2186180f47959a066795cc0f409433023af448bb0328Richard Smith } 2187180f47959a066795cc0f409433023af448bb0328Richard Smith 2188610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2189610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2190610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2191610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2192f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor ((Definition->isCopyConstructor() && Definition->isTrivial()) || 2193f6cfe8ba2b4d98c20181568e449edf0b60904b03Douglas Gregor (Definition->isMoveConstructor() && Definition->isTrivial()))) { 2194610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 21951aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS.setFrom(Info.Ctx, ArgValues[0]); 21961aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 21971aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RHS, Result); 2198610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2199610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2200610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 220151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2202180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2203180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2204180f47959a066795cc0f409433023af448bb0328Richard Smith 22058d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 2206180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2207180f47959a066795cc0f409433023af448bb0328Richard Smith 2208745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2209180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2210180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2211180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2212180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2213180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2214180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2215745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2216745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2217745f5147e065900267c85a5568785a1991d4838fRichard Smith 2218745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2219180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2220180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2221180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2222180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 222386c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2224180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2225180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2226180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2227180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2228180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 22298d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 22308d59deec807ed53efcd07855199cdc9c979f447fJohn McCall BaseType->getAsCXXRecordDecl(), &Layout)) 22318d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2232745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2233180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 22348d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout)) 22358d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2236180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2237180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2238745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2239745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2240745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2241745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2242d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2243d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2244d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2245d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2246d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2247d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2248d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2249d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2250d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2251d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2252d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2253d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2254d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2255d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2256d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2257d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2258d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2259d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2260d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2261d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2262d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 22638d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, (*I)->getInit(), Subobject, FD)) 22648d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2265d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2266d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2267d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2268d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2269d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2270180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2271d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2272180f47959a066795cc0f409433023af448bb0328Richard Smith } 2273745f5147e065900267c85a5568785a1991d4838fRichard Smith 227483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 227583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2276745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2277745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2278745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2279745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2280745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2281745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2282745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2283180f47959a066795cc0f409433023af448bb0328Richard Smith } 2284180f47959a066795cc0f409433023af448bb0328Richard Smith 2285745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2286180f47959a066795cc0f409433023af448bb0328Richard Smith} 2287180f47959a066795cc0f409433023af448bb0328Richard Smith 22884efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 22898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 22908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 22918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 22928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2293f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2294f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 22958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 22968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 22978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 22981aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith RetTy DerivedSuccess(const APValue &V, const Expr *E) { 22998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 23008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 230151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 230251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2303f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 23048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 230574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 230674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 230774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 230874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 230974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 231074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 231174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 231274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 231374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 231474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 231574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 231674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 231774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 231874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 231974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 232074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 232174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 232274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 232374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 232474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 232574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 232674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 232774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 232874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 232974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 233074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 233174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 233274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 233374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 233474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 233574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 233674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 233774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 233874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 233974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 234074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 234174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 234274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 234374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 23448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 23458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 23468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 23478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 23488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2349dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 23505cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith return Info.CCEDiag(E, D); 2351f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2352f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2353cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2354cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2355cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 2356cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 2357cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2358cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &getEvalInfo() { return Info; } 2359cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 2360f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2361f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2362f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 23635cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, D); 2364f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2365f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2366f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2367f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2368f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2369f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 23708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2371b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 23728cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2374f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 23768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 23778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 23788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 23828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 23838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 23858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 23868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 238791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 238891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 23893d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 23903d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2391bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2392bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2393bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2394bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 23958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2396c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2397c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2398c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2399c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2400c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2401c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2402c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2403c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2404c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2405e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2406e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2407e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2408f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2409e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2410e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2411e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2412e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2413e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2414e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2415e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2416e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2417e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2418e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 24191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2420f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2421e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2422e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2423e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2424e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2425e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2426e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 24278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 2428e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith // Evaluate and cache the common expression. We treat it as a temporary, 2429e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith // even though it's not quite the same thing. 2430e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith if (!Evaluate(Info.CurrentCall->Temporaries[E->getOpaqueValue()], 2431e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith Info, E->getCommon())) 2432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 24338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 243474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 24358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2438f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2439f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2440f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2441f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2442f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2443f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2444f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2445f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2446f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2447f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2448f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2449f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2450f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2451f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2452f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2453f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2454f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 245574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2456f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2457f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2458f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2459f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2460f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2461f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 24628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 24638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 24648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 2465e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith APValue &Value = Info.CurrentCall->Temporaries[E]; 2466e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith if (Value.isUninit()) { 246742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 246842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2469f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 247042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 247142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2472f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 247342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 247442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 247542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 2476e92b1f4917bfb669a09d220dc979fc3676df4da8Richard Smith return DerivedSuccess(Value, E); 24778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2478f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2479d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2480e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2481d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2482d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 24836142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 248459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 248559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 248686c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 248759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 248859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 248959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2490f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2491e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2492e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2493e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2494f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2495f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2496e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 249786c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2500f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2502e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2503e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2505f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2506f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2507f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2508f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 250959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2510b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2511b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 251359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2514b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2515f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 25161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 25171bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 251859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2519f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 252059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 252159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 252259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 252359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 252459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2525f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2526f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2527f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2528f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2529f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2530f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 253159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 253259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 253359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 253459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 253559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2536d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 253759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 253859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2539f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 254059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2541f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2542d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2543b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2544b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2545b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 254686c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 254786c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 254886c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 254986c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 255086c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 255186c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2552c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2553d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 25541aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Result; 2555d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2556c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2557745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2558745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2559f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2560d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 256183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2562d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2563d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2564c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2565c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2566c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2567f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 256871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 256971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 257071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 257171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2572f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2573f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2574f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 257551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2576f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2577f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 257851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2579f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2580e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 258151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2582e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2583f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2584180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2585180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2586180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2587180f47959a066795cc0f409433023af448bb0328Richard Smith 25881aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 2589180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2590180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2591180f47959a066795cc0f409433023af448bb0328Richard Smith 2592180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2593180f47959a066795cc0f409433023af448bb0328Richard Smith 2594180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2596180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2597890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == 2598180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2599180f47959a066795cc0f409433023af448bb0328Richard Smith 2600b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2601b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2602180f47959a066795cc0f409433023af448bb0328Richard Smith 2603f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2604180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2605180f47959a066795cc0f409433023af448bb0328Richard Smith } 2606180f47959a066795cc0f409433023af448bb0328Richard Smith 2607c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2608c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2609c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2610c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2611c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26127a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 26137a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2614c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 26157d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2616c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2617c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2618c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2619c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2620f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2621f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 26221aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RVal; 26239ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 26249ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 26259ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2628c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2629c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2630c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2631f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2632c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2633c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 26348327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 26358327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 26361aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 26378327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 26388327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 26398327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 26408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 26418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 26438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2648e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 26651aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 26661aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(this->Info.Ctx, V); 2667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2668e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2673e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2674e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2675e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2676890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek BaseTy = E->getBase()->getType()->castAs<PointerType>()->getPointeeType(); 2677c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2678af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2679c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2680c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2681c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2682e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2683e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2684e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2685e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2686e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2687e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2688d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2689d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2690d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2691d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2692d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 26938d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(this->Info, E, Result, FD)) 26948d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2695d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 26968d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueIndirectMember(this->Info, E, Result, IFD)) 26978d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 2698d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2699d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2700e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2701d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 27021aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue RefValue; 2703d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2704e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2705e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2706e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2707e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2708e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2709e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2710e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2711e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2712e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2713e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2714e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2715e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2716e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2717e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2718e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2719e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2721e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2723e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2724e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2725e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2726e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2727e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2728e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2729e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2730e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2731e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2732e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2733e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2734e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2735e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2736e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2737e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2738b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2739e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2740e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2741e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2742e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2743e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2744e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2745e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2746e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2747e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2748e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2749e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2750e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2751e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 27524efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2753c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2754c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2755c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2756c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2757c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2758c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2759c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 27601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 27611bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 27621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 27631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2764c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2765c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 276647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2767c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2768180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2769c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2770c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2771c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2772c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 27731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 277483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 277583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 27761bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 27774efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 27784efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2779770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2780e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 27814efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2782e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2783e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 27841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2785c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2786c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 27888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2789bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 27908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 27918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 27928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 27938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 279447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 2795e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet bool VisitCXXUuidofExpr(const CXXUuidofExpr *E); 27968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 27978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 279886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 279986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 28008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 28018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 280226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 280326bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 280526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2806db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2807c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 28080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 28090a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 28100a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 28110a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2812db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2814180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2815180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 281726bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 281826bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 28194efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 28204efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 28214efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2822c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2823c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2824c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2825c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2826c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2827efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2828c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2829c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2830c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 28318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 28324efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28334efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 28348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 28351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 28361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 28371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2838c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2839c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2840c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2841436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2842c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2843177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2844177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 284583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2846177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2847177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 28481bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2849177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 285050c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 28511aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue V; 2852f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2853f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2854f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 285535873c49adad211ff466e34342a52665742794f5Anders Carlsson} 285635873c49adad211ff466e34342a52665742794f5Anders Carlsson 2857bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2858bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2860af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 286383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 286483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 286583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 2866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 2869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 2872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2873f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 2874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 2875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 287683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 2877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2878bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 2879bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 28808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 28818cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2882c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 2883c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 2884c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 2885efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 28864efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 28874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 288847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 288947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 289047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 289147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 28920d729105ecb50a7e3cbe6e57c29149edfa5cf05aRichard Smith // FIXME: The standard says "a typeid expression whose operand is of a 28930d729105ecb50a7e3cbe6e57c29149edfa5cf05aRichard Smith // polymorphic class type" is not a constant expression, but it probably 28940d729105ecb50a7e3cbe6e57c29149edfa5cf05aRichard Smith // means "a typeid expression whose operand is potentially evaluated". 289547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 28965cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_typeid_polymorphic) 289747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 289847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 289947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 290047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 290147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 290247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 290347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 2904e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichetbool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) { 2905e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet return Success(E); 2906e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet} 2907e275a1845b9e32bd3034f2593dee1780855c8fd6Francois Pichet 29088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 2909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 2910c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 2911c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 2912c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2913c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2914c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2915d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 2916d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 2917d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 2918d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 29191bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 2920d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2921d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2922d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2923180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 2924e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 29254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29264efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 2928c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 2929c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 2930f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2931c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29323068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 2933efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 29341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29353068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 29363068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 2937efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 2938180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 2939180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 2940180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 29413068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 2942b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 29433068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 29444efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 2946efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 2947e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 2948e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 294986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 295086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 295186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 295286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 295386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 295486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 295586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 295686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 295786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 295886024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 295986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 296086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 296186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 296286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 296386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 296486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 296586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 296686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 29674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 2968f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 2969f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 2970f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 2971c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 2972770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 29738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 2974efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 2975efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 29768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 29771bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 2978efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 2979efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 29802bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 29811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2982efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 29838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 2984f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 29851aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 29861aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, V); 29878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 29882bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 298951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 2990f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 2991f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 29922bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 2993efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 29948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 2995efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 29968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 2997efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 2998eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) 2999ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek { return Success(E); } 30008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3001efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 30028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 30038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3004469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3005efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3006f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3007b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3008180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3009180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3010f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3011180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3012180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3013180f47959a066795cc0f409433023af448bb0328Richard Smith } 301456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3015ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 30162bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3017f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 30182bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3019efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3020c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 30218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3022f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3023650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3024efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 30252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 30262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3027e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 30281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3029650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3030650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3031650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3032f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 30331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3034745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3035745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3036efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3038efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3039745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3040efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3041efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3042efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3043efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 30440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 30450a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3046650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3047890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType Pointee = PExp->getType()->castAs<PointerType>()->getPointeeType(); 3048b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3049b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3050650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 30514efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3052efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3053efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 30544efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30568cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 30578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3058650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 305909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 306009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 306109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 306209a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 30641d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 30651d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 30662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 306728c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 306828c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3069c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3070c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3071c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 30724cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 307328c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 30744cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 30754cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 30764cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 30774cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 30784cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 30794cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 30800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 308109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 30825c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 30835c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 308447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 30855c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3086e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3087e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 30885c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3089180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 30905c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3091180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3092180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 30935c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3094180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 30955c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3096b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3097b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 30985c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3099180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 31005c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31015c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 31025c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 31035c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 31045c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3105e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3106e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3107e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3108e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3109e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3110e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 311247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 311349149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 311451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3115404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 31162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3117c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3118c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 31191aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Value; 3120efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 312109a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 312269ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3123efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 312447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 312547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 31261bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 312747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 312883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 31290a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3130efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3131efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3132efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 31331aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result.setFrom(Info.Ctx, Value); 3134efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3135650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3136650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 31372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3138e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3139e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3140e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3141e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 314283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 314383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 314483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3145e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3146e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 31470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3148b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3150b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3151b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3152b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 31530a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 31546a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 31552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 31566a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 31574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 31584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3159c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 31601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3161650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 31628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3163180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3164efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 316556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 31668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 31674efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3168f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3169f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3170e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3171e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3172e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3173e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3174e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3175e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3176e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3177e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3178e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3179e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3180e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3181e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3182e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3183e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3184e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3185e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3186e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 31871aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 3188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3190e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 319151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3192e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3193e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3194e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3195e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3196e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3197e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3198e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3199e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3200e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3201e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3202e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3203e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3204e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3205e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3206e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3207e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3208e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3209e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3210e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3211e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 321249149fe0d2be06ce1ceed1e9d2548a0b75a59c47Richard Smith VisitIgnoredValue(E->getSubExpr()); 321351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3214e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3215e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3216e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3217e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3218e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3219e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3220e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3221e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3222e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3223e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3224e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3225e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3226e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3227e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3228e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3229f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3230e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3231e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3232e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3233f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3240e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3241e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3242e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3243e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3244e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3245f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3246e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3247e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3248e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3249e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3250e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3251e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3252e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3253e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3254e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3255e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3256e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3257e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3258180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3259180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3260180f47959a066795cc0f409433023af448bb0328Richard Smith 3261180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3262180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3263180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3264180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3265180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3266180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3267180f47959a066795cc0f409433023af448bb0328Richard Smith 3268180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3269180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3270180f47959a066795cc0f409433023af448bb0328Richard Smith 32711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 327283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 327383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3274180f47959a066795cc0f409433023af448bb0328Richard Smith } 327551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3276180f47959a066795cc0f409433023af448bb0328Richard Smith 327759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3278180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3279180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3280180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3281180f47959a066795cc0f409433023af448bb0328Richard Smith} 3282180f47959a066795cc0f409433023af448bb0328Richard Smith 328351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 328451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 328551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 328651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 328751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 328851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 328951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3290b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3291b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 329251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 329351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 329451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 329551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 329651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 329751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 32988d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 329951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 330051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 330151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 330251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 330351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3304b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 330551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 330651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 33078d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout)) 33088d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3309b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 331051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 331151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 331251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 331351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 331451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3315b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3316b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 331751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 3318262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie if (I->getType()->isReferenceType()) 331951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 332051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 332151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3322581deb3da481053c4993c7600f97acf7768caac5David Blaikie if (!HandleLValueMember(Info, E, Subobject, *I, &Layout)) 33238d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 332451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3325262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie ImplicitValueInitExpr VIE(I->getType()); 332683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3327262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Result.getStructField(I->getFieldIndex()), Info, Subobject, &VIE)) 332851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 332951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 333051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 333151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 333251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 333351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 333451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 333551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 33361de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (RD->isInvalidDecl()) return false; 333751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 333851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 333951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 334051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 334151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 334251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 334351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 334451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 334551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 334651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3347581deb3da481053c4993c7600f97acf7768caac5David Blaikie if (!HandleLValueMember(Info, E, Subobject, *I)) 33488d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3349581deb3da481053c4993c7600f97acf7768caac5David Blaikie Result = APValue(*I); 3350262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie ImplicitValueInitExpr VIE(I->getType()); 335183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 335251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 335351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3354ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 33555cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_virtual_base) << RD; 3356ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3357ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3358ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3359b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 336051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 336151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 336259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 336359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 336459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 336559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 336659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 336759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 336859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 336959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 337059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 337159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 33721aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue DerivedObject; 3373f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 337459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3375f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3376f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 337759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 337859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 337959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 338059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 338159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 338259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 338359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 338459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 338559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 338659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 338759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 338859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 338959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 339059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 339159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 339259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 339359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3394180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 339524fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 339624fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 339724fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 339824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3399180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 34001de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (RD->isInvalidDecl()) return false; 3401180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3402180f47959a066795cc0f409433023af448bb0328Richard Smith 3403180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3404ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3405ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3406ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3407180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3408ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3409ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3410ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3411ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3412ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3413ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3414180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 34158d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout)) 34168d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 341783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3418180f47959a066795cc0f409433023af448bb0328Richard Smith } 3419180f47959a066795cc0f409433023af448bb0328Richard Smith 3420180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3421180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3422180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3423180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3424180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3425745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3426180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3427180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3428180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3429180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3430180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3431180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3432180f47959a066795cc0f409433023af448bb0328Richard Smith 3433180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3434180f47959a066795cc0f409433023af448bb0328Richard Smith 3435745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3436745f5147e065900267c85a5568785a1991d4838fRichard Smith 3437745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3438745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 34398d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (!HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, 3440581deb3da481053c4993c7600f97acf7768caac5David Blaikie Subobject, *Field, &Layout)) 34418d59deec807ed53efcd07855199cdc9c979f447fJohn McCall return false; 3442745f5147e065900267c85a5568785a1991d4838fRichard Smith 3443745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3444745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3445745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3446745f5147e065900267c85a5568785a1991d4838fRichard Smith 344783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3448262bc18e32500558af7cb0afa205b34bd37bafedDavid Blaikie Result.getStructField(Field->getFieldIndex()), 3449745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3450745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3451180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3452745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3453180f47959a066795cc0f409433023af448bb0328Richard Smith } 3454180f47959a066795cc0f409433023af448bb0328Richard Smith } 3455180f47959a066795cc0f409433023af448bb0328Richard Smith 3456745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3457180f47959a066795cc0f409433023af448bb0328Richard Smith} 3458180f47959a066795cc0f409433023af448bb0328Richard Smith 3459180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3460180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 34611de9d7de172379d6af75fd11dda2a713e4f36f62John McCall if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) return false; 34621de9d7de172379d6af75fd11dda2a713e4f36f62John McCall 346351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 346451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3465ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3466ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3467ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3468ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 346951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 347051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 347151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 34726180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 34736180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 34746180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 34756180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 34766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 34776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 34786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 34796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 34806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3481180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3482180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3483180f47959a066795cc0f409433023af448bb0328Richard Smith 3484c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3485c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3486180f47959a066795cc0f409433023af448bb0328Richard Smith 3487610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 348851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3489180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3490180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3491180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3492180f47959a066795cc0f409433023af448bb0328Richard Smith 349351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 349451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 349551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3496180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3497745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3499f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3500180f47959a066795cc0f409433023af448bb0328Richard Smith} 3501180f47959a066795cc0f409433023af448bb0328Richard Smith 3502180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3503180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3504180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3505180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3506180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3507180f47959a066795cc0f409433023af448bb0328Richard Smith} 3508180f47959a066795cc0f409433023af448bb0328Richard Smith 3509180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3510e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3511e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3512e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3513e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3514e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3515e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3516e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3517e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3518e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3519e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3520e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3521e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3522e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3523e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3524e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 352583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 352683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3527e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3528e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3529e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3530e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3531e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3532e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3533e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3534e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3535e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3536e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3537e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3538e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3539e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3540e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3541e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3542e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3543e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3544e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3545e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3546e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3547e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3548e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3549e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3550e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3551e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3552af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3553e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3554e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3555e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3556e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 355759b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 355859b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 355959b5da6d853b4368b984700315adf7b37de05764Nate Begeman 356059b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3561770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 356207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 356307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 356459b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 35651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 356607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 356707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 35681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 356907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 357007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 357107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 357207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 357307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 357407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 35751aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 357669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 357707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 357807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 357907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 358051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 35811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 358207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 358391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 358407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 358507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 358607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 358791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 35882217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 358991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 359059b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 359159b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 359259b5da6d853b4368b984700315adf7b37de05764Nate Begeman 359359b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3594c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 359507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 359659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 359759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 359807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 359907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3600c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 36011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3602d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3603e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 360459b5da6d853b4368b984700315adf7b37de05764Nate Begeman 360546a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 360646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 360707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 360846a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 360946a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 361046a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3611f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 361207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 361346a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 361446a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 361546a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3616f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 361707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 361846a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 361907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 362046a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3621c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3622c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 362307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 362407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3625e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3626e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3627e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3628e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3629e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3630e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3631e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3632e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3633e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3634e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3635e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3636e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3637e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3638e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3639e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3640e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3641e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3642e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3643e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3644e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3645e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3646e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3647e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3648e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3649e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3650e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3651e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3652e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3653e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3654e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3655e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3656e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3657e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3658e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3659e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3660e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3661e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3662e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3663e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 366446a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3665c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3666c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 366759b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 366859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 366907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 367059b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 367107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 367259b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 367391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 36741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 367559b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 36765f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 367759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 36783edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 36793edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 36803edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 36813edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 36823edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 36833edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 36843edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 36853edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 36863edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 36873edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 36883edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 36893edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 36903edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 36913edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 36923edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 36933edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 36943edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 369559b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 36963edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 36973edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 36984b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 36993edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 37003edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 37013edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 37023edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 370359b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 370459b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 37053edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 37063edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 37074b1f684416980ef6f1a7cb9e6af9c4fa4a164617Richard Smith return false; 37083edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 37093edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 37103edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 37113edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 371259b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 37133edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 371459b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 371507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 371659b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 371759b5da6d853b4368b984700315adf7b37de05764Nate Begeman 371807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 371951201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 372007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 372191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 372291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 372391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 372491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 372591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 372691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 372791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 372891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 37295f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 373007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 373191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 373291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 373307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 37348327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 373551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 373691110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 373791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 373859b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3739cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3740cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3741cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3742cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3743cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3744cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3745180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3746cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3747cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3748cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3749180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3750180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3751cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3752cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3753f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3754f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3755cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3756cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3757cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3758cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 375951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3760180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3761180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3762180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3763f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3764180f47959a066795cc0f409433023af448bb0328Richard Smith 3765180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3766180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3767180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3768180f47959a066795cc0f409433023af448bb0328Richard Smith 376951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3770180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3771b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3772180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 377383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3774180f47959a066795cc0f409433023af448bb0328Richard Smith } 3775180f47959a066795cc0f409433023af448bb0328Richard Smith 3776cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3777e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3778cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3779cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3780cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3781180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3782180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 378351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3784180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3785cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3786cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3787cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3788cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3789cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3790f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3791cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3792974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3793974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3794fe587201feaebc69e6d18858bea85c77926b6ecfRichard Smith if (E->isStringLiteralInit()) { 3795974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3796974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3797974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 37981aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 3799f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3800f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3801974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3802974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3803745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3804745f5147e065900267c85a5568785a1991d4838fRichard Smith 3805de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith assert((!Result.isArray() || Result.getArrayInitializedElts() == 0) && 3806de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith "zero-initialized array shouldn't have any initialized elts"); 3807de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith APValue Filler; 3808de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (Result.isArray() && Result.hasArrayFiller()) 3809de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Filler = Result.getArrayFiller(); 3810de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3811cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3812cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3813de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3814de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // If the array was previously zero-initialized, preserve the 3815de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // zero-initialized values. 3816de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!Filler.isUninit()) { 3817de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith for (unsigned I = 0, E = Result.getArrayInitializedElts(); I != E; ++I) 3818de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Result.getArrayInitializedElt(I) = Filler; 3819de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (Result.hasArrayFiller()) 3820de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Result.getArrayFiller() = Filler; 3821de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith } 3822de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3823180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3824b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3825180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3826cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3827180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 382883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 382983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3830745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3831745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3832745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3833745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3834745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3835745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3836180f47959a066795cc0f409433023af448bb0328Richard Smith } 3837cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3838745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3839cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3840180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3841180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3842180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3843180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 384483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 384583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3846cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3847cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3849de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3850de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // but sometimes does: 3851de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3852de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith // S s[10]; 3853de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith LValue Subobject = This; 3854de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith 3855de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith APValue *Value = &Result; 3856de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith bool HadZeroInit = true; 3857a4334dffde250c22c339a974a7131914fe723180Richard Smith QualType ElemTy = E->getType(); 3858a4334dffde250c22c339a974a7131914fe723180Richard Smith while (const ConstantArrayType *CAT = 3859a4334dffde250c22c339a974a7131914fe723180Richard Smith Info.Ctx.getAsConstantArrayType(ElemTy)) { 3860de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Subobject.addArray(Info, E, CAT); 3861de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith HadZeroInit &= !Value->isUninit(); 3862de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!HadZeroInit) 3863de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3864de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!Value->hasArrayFiller()) 3865de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith return true; 3866de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Value = &Value->getArrayFiller(); 3867a4334dffde250c22c339a974a7131914fe723180Richard Smith ElemTy = CAT->getElementType(); 3868de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith } 3869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3870a4334dffde250c22c339a974a7131914fe723180Richard Smith if (!ElemTy->isRecordType()) 3871a4334dffde250c22c339a974a7131914fe723180Richard Smith return Error(E); 3872a4334dffde250c22c339a974a7131914fe723180Richard Smith 3873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 38746180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 387551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 387651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3877ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3878ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3879ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 388051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 3881a4334dffde250c22c339a974a7131914fe723180Richard Smith ImplicitValueInitExpr VIE(ElemTy); 3882de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith return EvaluateInPlace(*Value, Info, Subobject, &VIE); 388351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 388451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 38856180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 38866180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 3887de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = APValue((FieldDecl*)0); 38886180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 3889de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith *Value = 38906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 38916180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 38926180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 38936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 38946180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3898c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3899c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3901ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 3902a4334dffde250c22c339a974a7131914fe723180Richard Smith ImplicitValueInitExpr VIE(ElemTy); 3903de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith if (!EvaluateInPlace(*Value, Info, Subobject, &VIE)) 390451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 390551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 390651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3908745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 3909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 3910de31aa7f0ef71f5c162372e319cbc03c0924f074Richard Smith Info, *Value); 3911e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3912e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3913cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3914f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 3915c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 3916c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 3917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 3918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 3919f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3920f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3921f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 3922770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 39238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 39241aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue &Result; 3925f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 39261aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith IntExprEvaluator(EvalInfo &info, APValue &result) 39278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 3928f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3929cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) { 3930973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 39312ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 3932973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 39333f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 3934973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39353f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39361aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(SI); 39373f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 39383f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 3939cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APSInt &SI, const Expr *E) { 3940cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(SI, E, Result); 3941cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 39423f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 3943cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) { 39442ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39452ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 394630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 39473f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 39481aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(APSInt(I)); 3949575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 3950575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 3951131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3952131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3953cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const llvm::APInt &I, const Expr *E) { 3954cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(I, E, Result); 3955cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 3956131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 3957cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 39582ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 39592ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 39601aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); 3961131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 3962131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 3963cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E) { 3964cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(Value, E, Result); 3965cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 3966131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 39674f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 39684f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 39694f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 39704f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 39711aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *E) { 39725930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 3973342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 3974342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 3975342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 39768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 397732fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 39781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 397951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 3980f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 39818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 39828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 39838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 3984f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 39854c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 3986131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39874c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 39884c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 3989131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 39904c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 3991043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 3992043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 3993043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 39948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 39958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 39968cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 39978cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 3998043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 3999043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4000043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4001c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4002043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4003043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40058cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4006043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4007043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4009b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40108ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4011b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4012f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4014f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 40150518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 40163068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4017131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40183068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 40191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4020ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { 4021ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek return Success(E->getValue(), E); 4022ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek } 4023ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek 4024f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 40253f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 402651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4027664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4028664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 402964b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 40300dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 403164b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 403264b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 40336ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 40346ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 40356ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 40366ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 40374ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor bool VisitTypeTraitExpr(const TypeTraitExpr *E) { 40384ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor return Success(E->getValue(), E); 40394ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor } 40404ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor 404121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 404221ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 404321ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 404421ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4045552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4046552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4047552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4048552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4049722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4050664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4051664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4052295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4053ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4054cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4055fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 40568b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 40578b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 40581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 40598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4060664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4061f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4062f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4063f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4064c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4065c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4066c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4067c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4068c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4069c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4070c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4071c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 40721aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, 407347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4074c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 40758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 407669ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 407769ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4078f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 40791aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Val; 4080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4082f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4084f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 40855cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 408630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4087f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 408830c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 408930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4090f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4091f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4092f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4093f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4094f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4095043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 40964c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4097bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4098973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4099973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4100973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4101973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4102973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4103973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4104973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4105973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4106973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4107973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4108973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4109973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4110973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4111973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4112973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4113973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4114973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4115bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41174c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41184c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4119a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4120a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4121a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4122a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 41237c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4124a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4125a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4126a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4127a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4128a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4129a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4130a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4131a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4132a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4133a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4134a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 41351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 41361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4137a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4138a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4139a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 41401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4141a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4142a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4143a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4144a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4145a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4146a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4147a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4148a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4149a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4150a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4151a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4152a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4153a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4154a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4155a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4156a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4157a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4158a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4159a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4160a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4161a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4162fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4163a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4164a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4165a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4166a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4167a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4168a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4169a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4170a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4171b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4172a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4173a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 417480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 417580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 417680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 417780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 417880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 417980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 418080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 41818e55ed1ad3acf9c7f8424aa7d326b3b2c18e943bDouglas Gregor const Expr *E = LV.getLValueBase().template dyn_cast<const Expr*>(); 418280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 418380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 418480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 418580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 418680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 418780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 418880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 418980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 419080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 419180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 419280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 419380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 419480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 419580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 419680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 419780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 419880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 419980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 420080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 420180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 420280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 420380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 420480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 420580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 420680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 420780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 420880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 420980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 421080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 421180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 421280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 421380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 421480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 421580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 421680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 421780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 421880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 421980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 422080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 422180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 422280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 422380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 422480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 422580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 422680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 422780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 422880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 422942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 423042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 42311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 42321bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 42331bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 423442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 42351bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 42361bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 42371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 423842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 423942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 424042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 424142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 424242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 424442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 4245c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith 4246c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith { 4247c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // The operand of __builtin_object_size is never evaluated for side-effects. 4248c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // If there are any, but we can determine the pointed-to object anyway, then 4249c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // ignore the side-effects. 4250c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith SpeculativeEvaluationRAII SpeculativeEval(Info); 4251c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith if (!EvaluatePointer(E->getArg(0), Base, Info)) 4252c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith return false; 4253c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith } 425442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 425542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 42561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 425742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42581bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 425942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 426042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 42611357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 426242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 426342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 426542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 426642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 426742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 426842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 426942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 427042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 427142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 427242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 42734f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 427442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 427542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 42768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 42772c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith switch (unsigned BuiltinOp = E->isBuiltinCall()) { 4278019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 42798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 428064eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 428164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 428242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 428342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 428464eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 42858ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // If evaluating the argument has side-effects, we can't determine the size 42868ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // of the object, and so we lower it to unknown now. CodeGen relies on us to 42878ae4ec28451a16a57718286da3e476fc2f495c3fRichard Smith // handle all cases where the expression has side-effects. 4288393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4289a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4290cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 429164eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 429264eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4293c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4294c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // Expression had no side effects, but we couldn't statically determine the 4295c6794850a570a91c5f224b6f0293db9f560f4213Richard Smith // size of the referenced object. 4296f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 429764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 429864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4299019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4300131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 430280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 430380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4304e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 430521fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4306a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4307bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 430821fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 430921fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4310c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4311c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4312c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 431340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43145726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 431540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 431640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 43175cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_invalid_function) 431840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 431940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 43205cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 432140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43225726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43235726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43245726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43265726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43275726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43285726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43295f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 43305f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 43315f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 43325726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 43335726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 43345726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 43355726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 43365726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4337f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4338454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 43392c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith case Builtin::BI__atomic_always_lock_free: 4340fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__atomic_is_lock_free: 4341fafbf06732746f3ceca21d452d77b144ba8652aeRichard Smith case Builtin::BI__c11_atomic_is_lock_free: { 4342454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4343454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4344454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4345454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4346454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4347454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4348454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4349454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4350454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4351454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4352454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4353454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4354454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4355454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4356454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 43572c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size.isPowerOfTwo()) { 43582c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // Check against inlining width. 43592c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith unsigned InlineWidthBits = 43602c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 43612c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) { 43622c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free || 43632c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Size == CharUnits::One() || 43642c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith E->getArg(1)->isNullPointerConstant(Info.Ctx, 43652c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Expr::NPC_NeverValueDependent)) 43662c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline appropriately-aligned operations of this size, 43672c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // and _Atomic(T) is appropriately-aligned. 43682c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 43692c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith 43702c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()-> 43712c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith castAs<PointerType>()->getPointeeType(); 43722c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith if (!PointeeType->isIncompleteType() && 43732c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) { 43742c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith // OK, we will inline operations on this object. 43752c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return Success(1, E); 43762c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 43772c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 43782c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith } 4379454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 43802c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith return BuiltinOp == Builtin::BI__atomic_always_lock_free ? 43812c39d71bb7cefdfe6116fa52454f3b3dc5abd517Richard Smith Success(0, E) : Error(E); 4382454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4383019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 43844c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4385f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4386625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4387625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4388625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4389625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4390625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4391625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 43921bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 43931bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4394625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4395625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4396625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4397625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 43989a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4399625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4400625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4401625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4402625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 440383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4404625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4405625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44067b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44077b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44087b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44097b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44107b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44117b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44127b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44137b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44157b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44167b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44177b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44187b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44197b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44207b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44217b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44227b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4423cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisnamespace { 4424c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 4425cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// \brief Data recursive integer evaluator of certain binary operators. 4426cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// 4427cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// We use a data recursive algorithm for binary operators so that we are able 4428cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// to handle extreme cases of chained binary operators without causing stack 4429cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis/// overflow. 4430cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisclass DataRecursiveIntBinOpEvaluator { 4431cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct EvalResult { 4432cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue Val; 4433cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Failed; 4434cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4435cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult() : Failed(false) { } 4436cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4437cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void swap(EvalResult &RHS) { 4438cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Val.swap(RHS.Val); 4439cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Failed = RHS.Failed; 4440cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.Failed = false; 4441cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4442cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4443cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4444cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis struct Job { 4445cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *E; 4446cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult LHSResult; // meaningful only for binary operator expression. 4447cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind; 4448cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4449cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job() : StoredInfo(0) { } 4450cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void startSpeculativeEval(EvalInfo &Info) { 4451cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OldEvalStatus = Info.EvalStatus; 4452cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.Diag = 0; 4453cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo = &Info; 4454cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4455cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis ~Job() { 4456cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (StoredInfo) { 4457cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis StoredInfo->EvalStatus = OldEvalStatus; 4458cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4459cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4460cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis private: 4461cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo *StoredInfo; // non-null if status changed. 4462cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Expr::EvalStatus OldEvalStatus; 4463cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis }; 4464cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4465cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SmallVector<Job, 16> Queue; 4466cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4467cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis IntExprEvaluator &IntEval; 4468cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalInfo &Info; 4469cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APValue &FinalResult; 4470cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4471cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidispublic: 4472cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result) 4473cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { } 4474cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4475cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// \brief True if \param E is a binary operator that we are going to handle 4476cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// data recursively. 4477cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// We handle binary operators that are comma, logical, or that have operands 4478cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis /// with integral or enumeration type. 4479cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis static bool shouldEnqueue(const BinaryOperator *E) { 4480cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return E->getOpcode() == BO_Comma || 4481cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->isLogicalOp() || 4482cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis (E->getLHS()->getType()->isIntegralOrEnumerationType() && 4483cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4484cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4485cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4486cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Traverse(const BinaryOperator *E) { 4487cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(E); 4488cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult PrevResult; 4489b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu while (!Queue.empty()) 4490b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu process(PrevResult); 4491b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu 4492b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu if (PrevResult.Failed) return false; 4493cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4494cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis FinalResult.swap(PrevResult.Val); 4495cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4496a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4497a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4498cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisprivate: 4499cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(uint64_t Value, const Expr *E, APValue &Result) { 4500cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4501cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4502cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Success(const APSInt &Value, const Expr *E, APValue &Result) { 4503cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Success(Value, E, Result); 4504cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4505cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E) { 4506cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E); 4507cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4508cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool Error(const Expr *E, diag::kind D) { 4509cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return IntEval.Error(E, D); 4510cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4511cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4512cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 4513cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Info.CCEDiag(E, D); 4514cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4515cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 45169293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis // \brief Returns true if visiting the RHS is necessary, false otherwise. 45179293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4518cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags); 45192fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4520cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4521cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result); 4522cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4523cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void EvaluateExpr(const Expr *E, EvalResult &Result) { 4524cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Failed = !Evaluate(Result.Val, Info, E); 4525cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (Result.Failed) 4526cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.Val = APValue(); 4527cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4528cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4529b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu void process(EvalResult &Result); 4530cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4531cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis void enqueue(const Expr *E) { 4532cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E = E->IgnoreParens(); 4533cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.resize(Queue.size()+1); 4534cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().E = E; 4535cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.back().Kind = Job::AnyExprKind; 4536cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4537cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis}; 4538cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4539cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4540cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4541cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 45429293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, 4543cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool &SuppressRHSDiags) { 4544cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4545cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Ignore LHS but note if we could not evaluate it. 4546cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed) 4547cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4548cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4549cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4550cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4551cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4552cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult; 4553cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (HandleConversionToBool(LHSResult.Val, lhsResult)) { 45542fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We were able to evaluate the LHS, see if we can get away with not 45552fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 4556cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (lhsResult == (E->getOpcode() == BO_LOr)) { 45579293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis Success(lhsResult, E, LHSResult.Val); 45589293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS 45592fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 45602fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } else { 45612fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // Since we weren't able to evaluate the left hand side, it 45622fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // must have had side effects. 45632fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis Info.EvalStatus.HasSideEffects = true; 4564cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4565cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 4566cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 4567cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Don't ignore RHS and suppress diagnostics from this arm. 4568cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis SuppressRHSDiags = true; 4569cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4570cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4571cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4572cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4573cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4574cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4575cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4576cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4577cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed && !Info.keepEvaluatingAfterFailure()) 45789293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis return false; // Ignore RHS; 45799293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis 4580cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4581cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 45822fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis 4583cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool DataRecursiveIntBinOpEvaluator:: 4584cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, 4585cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *E, APValue &Result) { 4586cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Comma) { 4587cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSResult.Failed) 4588cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4589cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSResult.Val; 4590cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4591cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4592cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4593cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isLogicalOp()) { 4594cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool lhsResult, rhsResult; 4595cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult); 4596cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult); 4597cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4598cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSIsOK) { 4599cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 4600cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_LOr) 4601cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult || rhsResult, E, Result); 4602cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4603cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(lhsResult && rhsResult, E, Result); 4604cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4605cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else { 4606cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHSIsOK) { 46072fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // We can't evaluate the LHS; however, sometimes the result 46082fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 46092fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis if (rhsResult == (E->getOpcode() == BO_LOr)) 4610cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(rhsResult, E, Result); 46112fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 46122fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4613cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 46142fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis return false; 46152fa975c94027c6565cb112ffcf93c05b22922c0eArgyrios Kyrtzidis } 4616cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4617cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert(E->getLHS()->getType()->isIntegralOrEnumerationType() && 4618cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis E->getRHS()->getType()->isIntegralOrEnumerationType()); 4619cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4620cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSResult.Failed || RHSResult.Failed) 4621cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4622cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4623cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &LHSVal = LHSResult.Val; 4624cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APValue &RHSVal = RHSResult.Val; 4625cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4626cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like (unsigned long)&a + 4. 4627cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4628cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = LHSVal; 4629cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CharUnits AdditionalOffset = CharUnits::fromQuantity( 4630cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.getInt().getZExtValue()); 4631cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add) 4632cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += AdditionalOffset; 4633cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else 4634cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() -= AdditionalOffset; 4635cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4636cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4637cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4638cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle cases like 4 + (unsigned long)&a 4639cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Add && 4640cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSVal.isLValue() && LHSVal.isInt()) { 4641cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = RHSVal; 4642cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result.getLValueOffset() += CharUnits::fromQuantity( 4643cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHSVal.getInt().getZExtValue()); 4644cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4645cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4646cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4647cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 4648cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Handle (intptr_t)&&A - (intptr_t)&&B. 4649cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.getLValueOffset().isZero() || 4650cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSVal.getLValueOffset().isZero()) 4651cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4652cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 4653cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 4654cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSExpr || !RHSExpr) 4655cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4656cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 4657cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 4658cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSAddrExpr || !RHSAddrExpr) 4659cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4660cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Make sure both labels come from the same function. 4661cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHSAddrExpr->getLabel()->getDeclContext() != 4662cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHSAddrExpr->getLabel()->getDeclContext()) 4663cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return false; 4664cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result = APValue(LHSAddrExpr, RHSAddrExpr); 4665cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return true; 4666cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4667cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4668cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // All the following cases expect both operands to be an integer 4669cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (!LHSVal.isInt() || !RHSVal.isInt()) 4670cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4671cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4672cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const APSInt &LHS = LHSVal.getInt(); 4673cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis APSInt RHS = RHSVal.getInt(); 4674cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4675cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (E->getOpcode()) { 4676cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis default: 4677cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4678cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Mul: 4679cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4680cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() * 2, 4681cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::multiplies<APSInt>()), E, 4682cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4683cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Add: 4684cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4685cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4686cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::plus<APSInt>()), E, Result); 4687cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Sub: 4688cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 4689cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.getBitWidth() + 1, 4690cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis std::minus<APSInt>()), E, Result); 4691cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_And: return Success(LHS & RHS, E, Result); 4692cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Xor: return Success(LHS ^ RHS, E, Result); 4693cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Or: return Success(LHS | RHS, E, Result); 4694cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Div: 4695cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Rem: 4696cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS == 0) 4697cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E, diag::note_expr_divide_by_zero); 4698cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is 4699cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // not actually undefined behavior in C++11 due to a language defect. 4700cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isNegative() && RHS.isAllOnesValue() && 4701cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis LHS.isSigned() && LHS.isMinSignedValue()) 4702cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 4703cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E, 4704cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Result); 4705cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shl: { 4706cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // During constant-folding, a negative shift is an opposite shift. Such 4707cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // a shift is not a constant expression. 4708cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isSigned() && RHS.isNegative()) { 4709cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4710cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4711cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_right; 4712cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4713cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4714cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_left: 4715cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of 4716cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // the shifted type. 4717cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4718cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) { 4719cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4720cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4721cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } else if (LHS.isSigned()) { 4722cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4723cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // operand, and must not overflow the corresponding unsigned type. 4724cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (LHS.isNegative()) 4725cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4726cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis else if (LHS.countLeadingZeros() < SA) 4727cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_lshift_discards); 4728cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4729cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4730cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS << SA, E, Result); 4731cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4732cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_Shr: { 4733cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // During constant-folding, a negative shift is an opposite shift. Such a 4734cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // shift is not a constant expression. 4735cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (RHS.isSigned() && RHS.isNegative()) { 4736cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4737cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS = -RHS; 4738cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis goto shift_left; 4739cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4740cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4741cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis shift_right: 4742cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4743cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // shifted type. 4744cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4745cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SA != RHS) 4746cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis CCEDiag(E, diag::note_constexpr_large_shift) 4747cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis << RHS << E->getType() << LHS.getBitWidth(); 4748cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4749cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Success(LHS >> SA, E, Result); 4750cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4751cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4752cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LT: return Success(LHS < RHS, E, Result); 4753cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GT: return Success(LHS > RHS, E, Result); 4754cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_LE: return Success(LHS <= RHS, E, Result); 4755cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_GE: return Success(LHS >= RHS, E, Result); 4756cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_EQ: return Success(LHS == RHS, E, Result); 4757cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case BO_NE: return Success(LHS != RHS, E, Result); 4758cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4759cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4760cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4761b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieuvoid DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) { 4762cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Job &job = Queue.back(); 4763cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4764cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis switch (job.Kind) { 4765cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::AnyExprKind: { 4766cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) { 4767cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (shouldEnqueue(Bop)) { 4768cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpKind; 4769cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getLHS()); 4770b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4771cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4772cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4773cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4774cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvaluateExpr(job.E, Result); 4775cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4776b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4777cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4778cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4779cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpKind: { 4780cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4781cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis bool SuppressRHSDiags = false; 47829293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) { 4783cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4784b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4785cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4786cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (SuppressRHSDiags) 4787cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.startSpeculativeEval(Info); 47889293fff58aa0198fa7a6bb504169bcac01dbbff7Argyrios Kyrtzidis job.LHSResult.swap(Result); 4789cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis job.Kind = Job::BinOpVisitedLHSKind; 4790cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis enqueue(Bop->getRHS()); 4791b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4792cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4793cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4794cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis case Job::BinOpVisitedLHSKind: { 4795cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis const BinaryOperator *Bop = cast<BinaryOperator>(job.E); 4796cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis EvalResult RHS; 4797cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis RHS.swap(Result); 4798b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val); 4799cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis Queue.pop_back(); 4800b778305e95f9977e6710f2b04830ecc36398ab5eRichard Trieu return; 4801cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4802cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis } 4803cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4804cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis llvm_unreachable("Invalid Job::Kind!"); 4805cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis} 4806cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4807cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidisbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4808cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (E->isAssignmentOp()) 4809cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return Error(E); 4810cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis 4811cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E)) 4812cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E); 481354176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4814286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4815286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 48164087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48174087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 48184087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4819f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 48204087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4821745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4822745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 48234087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48244087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4825745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 48264087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 48274087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48284087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 48291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 48304087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 48311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 48324087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 48334087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 48342de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4835131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4836131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4837131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4839131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 48401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4841fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4842fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 48431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4844fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4845fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4846131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48474087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 48482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4849131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4850131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4851131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 48522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4853131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4854131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4855131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4856131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 48574087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48584087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 48591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4860286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4861286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4862286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 48631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4864745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4865745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4866286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 48671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4868745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4869286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 48701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4871286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4872529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4873286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4874286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4875b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 48762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4877131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 48782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4879131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 48802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4881131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 48822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 48831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4884131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 48852de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4886131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 48872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 48881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4889fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4890fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4891286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4892286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 48931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4894ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4895625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4896745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4897745f5147e065900267c85a5568785a1991d4838fRichard Smith 4898745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4899745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 49003068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4901a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4902745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 49033068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4904a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4905625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4906625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4907625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 490865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 490965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 491065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 491165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 491265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 491365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 491465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 491565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 491665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 491765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 491865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 491965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 49205930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 49215930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 49225930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 49235930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 49241aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(LHSAddrExpr, RHSAddrExpr); 492565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 492665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 49279e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 49289e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 49295bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4930f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4931ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4932ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4933c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4934ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4935ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4936f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49379e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4938b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4939b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4940b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 494174f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 494274f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4943f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49449e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 49459e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 49469e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4947f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49489e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4949c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4950c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4951c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 49529e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 49535bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4954a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 495515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 495615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 495715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4958f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4959f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4960f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 49612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4962f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4963f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4964f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4965f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4966f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4967f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4968f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4969f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4970f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 49714992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 49724992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 49733068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4974180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 497574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 4976180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4977a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 497815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 497915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 498015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 498115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 498215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 498315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 498415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 498515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 498615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 498715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 498815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 498915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 499015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 499115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 499215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 499315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 499415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 499515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 499615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 499715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4998ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4999625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 500082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 500182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 500282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 500382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 500482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 500582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 500682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 500782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 5008f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 500982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 501082f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 5011f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 5012f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 5013f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 5014f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 5015f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 5016f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 5017f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 5018f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 5019f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 5020f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 5021f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 5022f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 5023f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 5024f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 5025f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 5026f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 5027f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 5028f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 5029f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 5030f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 5031f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 5032f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 5033f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 5034f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 5035f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 5036f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 5037f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 5038f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5039f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 5040f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 5041f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 5042f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 5043f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 5044f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 5045f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 5046f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 5047f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 5048f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 5049f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 5050f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5051f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 5052f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 5053a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // The comparison here must be unsigned, and performed with the same 5054a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman // width as the pointer. 5055a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy); 5056a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareLHS = LHSOffset.getQuantity(); 5057a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t CompareRHS = RHSOffset.getQuantity(); 5058a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman assert(PtrSize <= 64 && "Unexpected pointer width"); 5059a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman uint64_t Mask = ~0ULL >> (64 - PtrSize); 5060a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareLHS &= Mask; 5061a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman CompareRHS &= Mask; 5062a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman 50632850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // If there is a base and this is a relational operator, we can only 50642850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // compare pointers within the object in question; otherwise, the result 50652850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman // depends on where the object is located in memory. 50662850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (!LHSValue.Base.isNull() && E->isRelationalOp()) { 50672850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman QualType BaseTy = getType(LHSValue.Base); 50682850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (BaseTy->isIncompleteType()) 50692850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 50702850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy); 50712850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman uint64_t OffsetLimit = Size.getQuantity(); 50722850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit) 50732850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman return Error(E); 50742850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman } 50752850376184b7e7aa81b5034ba44b001f8c55e07aEli Friedman 5076625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 5077625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 5078a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LT: return Success(CompareLHS < CompareRHS, E); 5079a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GT: return Success(CompareLHS > CompareRHS, E); 5080a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_LE: return Success(CompareLHS <= CompareRHS, E); 5081a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_GE: return Success(CompareLHS >= CompareRHS, E); 5082a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_EQ: return Success(CompareLHS == CompareRHS, E); 5083a31698842e9893559d58a7bf1a987f2ae90bea0bEli Friedman case BO_NE: return Success(CompareLHS != CompareRHS, E); 5084ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 50853068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 50863068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 5087b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5088b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 5089b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 5090b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 5091b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5092b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 5093b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5094b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 5095b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 5096b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5097b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5098b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 5099b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 5100b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5101b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 5102b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 5103b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 5104b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 5105b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 5106b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5107b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5108b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5109b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 5110b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 5111b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 5112b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5113b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5114b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 5115b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 5116b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 5117b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 5118b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 5119b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 5120b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 5121b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 5122b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 5123b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 5124b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 5125b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 512626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 512726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 512826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 512926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 513026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 513126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 513226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 513326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 513426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 513526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 5136cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis assert((!LHSTy->isIntegralOrEnumerationType() || 5137cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis !RHSTy->isIntegralOrEnumerationType()) && 5138cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis "DataRecursiveIntBinOpEvaluator should have handled integral types"); 5139cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis // We can't continue from here for non-integral types. 5140cc2f77a7dbc5fb58fe188d55fbfb074e80fe5663Argyrios Kyrtzidis return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 5141a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 5142a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 51438b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 51445d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 51455d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 51465d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 51475d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 51489f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 51499f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 51509f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 51519f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 5152e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5153e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 51548b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 5155af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 5156af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5157af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 51581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 5159af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 51608b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 51618b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5162a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5163af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 51648b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 51658b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5166af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5167e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 5168e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5169e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5170e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5171f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 5172f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 5173f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 5174f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 5175f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 5176f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 5177e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 51784f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 5179e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 51804f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 5181e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 5182a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5183f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 5184f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 51850518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 5186f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 5187890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek unsigned n = Ty->castAs<VectorType>()->getNumElements(); 5188a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5189f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 5190f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 5191f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5192f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5193f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5194f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5195f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5196f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5197f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5198f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5199f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5200f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5201f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5202f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5203f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5204f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5205f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5206180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 520774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5208f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5209180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5210f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5211f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5212f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5213f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5214fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5215fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 52168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 52178ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 52188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 52198ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5220f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 52228ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 52238ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 52248ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 52258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 52268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 52278ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 52288ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 52298ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 52308ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 52318ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5232f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52338ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 52348ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 52358ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 52368ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52378ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5238f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52398ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 52408ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 52418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5242f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5243f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 52448ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 52458d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 52468ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5247ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5248cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5249fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 52508ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 52518ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 52528ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5253f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 52548ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 52558ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5256f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5257cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5258cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5259cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5260f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5261cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5262cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5263cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5265f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5266cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 52678d59deec807ed53efcd07855199cdc9c979f447fJohn McCall if (RD->isInvalidDecl()) return false; 5268cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5269cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5270cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5271cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5272cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5273cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5274f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5275cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5276cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 52777c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5278cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5279cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 52808ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 52818ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 52828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 52838ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 52848ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5285b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 528675a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 52874c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 528875a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 528975a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5290f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 52912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 52924c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 52934c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5294f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 52952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5296c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5297f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5298f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5299f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5300f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5301f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5302789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5303789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5304789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5305789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5306789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5307f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5308f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5309f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5310f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5311f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5312f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5313f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5314f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5315f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5316f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5317f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5318f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5319f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 532006a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5321a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 53221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5323732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5324732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 53258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 53268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 532782206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5328b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 532982206e267ce6cc709797127616f64672d255b310Anders Carlsson 533046a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 533146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 533246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 533346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 533446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 533546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 533646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 533746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 533846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 533946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 534046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 534146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 53424d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 534346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 534446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 534546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 534646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 534746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 534846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 53491d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 53501d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 535146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 535246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 535346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 535446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 535546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 535646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 535746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 535846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 535946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 536046a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 536146a523285928aa07bf14803178dc04616ac85994Eli Friedman 5362e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 536346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 536446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 536533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 536633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 536733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 536833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5369ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 5370f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 537146a523285928aa07bf14803178dc04616ac85994Eli Friedman 53727d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 537346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 53747a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 53757a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 537646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5377c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 537846a523285928aa07bf14803178dc04616ac85994Eli Friedman 537946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 538046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 538146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 538246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 538346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 538446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 53854efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5386c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 53874efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5388131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 53894efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 53904efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 539146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5392732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5393b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5394a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5395be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 539665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 539765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 539865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 539965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 540065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 540165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 540265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5403be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5404be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5405be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 540630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5407f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5408f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5409732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 54101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 541146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5412c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5413c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5414efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 541587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5416b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 54174efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5418dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5419dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5420f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5421f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5422f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5423dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5424f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5425dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5426b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5427efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5428dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5429dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 54304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5431a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5432a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5433f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 54342bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 54354efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 543646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5437f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 54381725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 54391725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 544046a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 54411725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 54422217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 544346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 544446a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 544546a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 544646a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5447732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5448c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5449c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5450c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5451c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 545246a523285928aa07bf14803178dc04616ac85994Eli Friedman } 545346a523285928aa07bf14803178dc04616ac85994Eli Friedman } 54541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 545546a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5456a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 54572bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5458722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5459722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5460f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5461f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5462f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5463f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5465722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5466722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5467722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5468722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5469722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5470722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5471664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5472722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5473f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5474f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5475f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5476f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5477f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5478722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5479722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5480722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 54818327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5482664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5483664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5484664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5485ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5486ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5487ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5488ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5489295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5490295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5491295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5492295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5493f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5494d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5495d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5496d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5497d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5498770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 54998cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5500d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5501d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5502d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 55038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5504d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55051aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 55068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 55078cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5509d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 551051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5511f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5512f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5513f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5514f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5515019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5516d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55175db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5518d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5519d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 55208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 55212217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5522abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5523abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5524ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 552551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5526d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5527d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5528d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5529d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5530c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 55318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5532d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5533d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55344ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5535db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5536db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5537db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5538db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5539db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5540db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5541db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5542db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5543db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5544db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5545db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5546db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5547db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5548db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5549db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5550db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5551db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5552db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5553db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5554db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5555db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5556db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5557db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5558db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5559019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5560180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 55618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 55628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 55638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5564019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5565019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5566019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5567019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5568019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 55697cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 55707cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 55717cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 557234a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 557334a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 55747cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 55751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5576db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5577db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5578db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5579f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5580f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5581f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5582f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5583db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 55849e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 55859e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 55869e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 55874572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 55889e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5589f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5590f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5591f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5592f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 55935db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 55945db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 55955db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 55965db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 55975db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 55985db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 55991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56005db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 56015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56025db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56035db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 56041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 56051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 56065db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 56075db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 56085db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 56095db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 56105db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 56115db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 56125db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56135db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5614019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5615019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5616019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5617abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 561843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 561943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 562043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 562143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 562243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 562343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 562443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 562543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 562643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5627abd3a857ace59100305790545d1baae5877b8945John McCall} 5628abd3a857ace59100305790545d1baae5877b8945John McCall 5629abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 563043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 563143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 563243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 563343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 563443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 563543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 563643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 563743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 56388327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 563943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 564043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5641abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5642abd3a857ace59100305790545d1baae5877b8945John McCall} 5643abd3a857ace59100305790545d1baae5877b8945John McCall 56445db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 56455db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 56472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 56487993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 56492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 56507993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 56517993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 56525db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 56535db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 56545db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 56555db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5656019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5657d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 566096e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 56615db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5662745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5663745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5664d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5665745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5666d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5667d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5668d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5669f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 56702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5671d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 56727b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 56732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5674d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 56757b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 56762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5677d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 56787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 56792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5680d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 56817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5682d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 56837b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 56847b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 56857b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 56867b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5687d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5688d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5689d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5690d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5691d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5692d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5693d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 56948cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 56958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 56961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 56972a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 56982a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5699c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 57002a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57012a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 57024efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5703c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5704c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5705c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 57064efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 57072a523eec6a31955be876625819b89e8dc5def707Eli Friedman 57082a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 57094efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 57104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5711c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5712c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 57134efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5714f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 57152a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5716f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5717f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5718f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5719f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5720f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5721f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 57222a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 57234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 57244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5725d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5726a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 57279ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 57289ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57299ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5730770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 57318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5732f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 57331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57349ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5735f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 57368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 57371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57381aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { 57398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 57408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 57418cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 57421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57437ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 57447ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 57458cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 57478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 57489ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 57508cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5751b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 575296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 57537ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5754b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5755b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 57561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5757b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5758b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5759c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 57608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5761b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5762b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 57637ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5764890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType(); 57657ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 57667ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 57677ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 57687ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 57697ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 57707ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 57717ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 57727ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 57737ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 57747ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 57757ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 57767ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 57777ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 57787ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 57798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 57808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5781b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5782b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5783b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5784b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5785b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5786b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5787b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5788b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5789b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5790b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5791b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5792b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5793b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5794b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5795b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5796b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5797b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5798b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5799b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5800b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5801b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5802b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5803b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5805b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 58078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 58088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 58098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 58108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 58118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 58128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 58138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 58148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 58158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 58168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 58178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 58188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 58198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 58204d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 58218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 58228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 58238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 58248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 58258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 58268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 58278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 58288786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 58298786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 58308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 58318786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 58328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 58331d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 58341d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 58358786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 58368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 58378786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 58388786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 58398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 58408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 584133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 584233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 584333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 584433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5845ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfaDouglas Gregor case CK_CopyAndAutoreleaseBlockObject: 58468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 58478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 58497a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 58507a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 58518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5852c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 58532bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 58548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 585546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 58568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5857f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 58588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5860b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 58618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5862b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5863b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 58648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 58658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 58668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 58678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 58688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 58708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 58718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 58728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58738786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 58748786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 58758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 58768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5877c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5878c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 58798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 58808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58818786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 58828786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 58838786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 58848786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 58868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 58878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 58888786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5889c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5890c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5891c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5892c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 58938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 58948786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 58958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5896b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 58978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5898b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 58999ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 59008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 59018786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 59028786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 59068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5907b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5908ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 59098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 59108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 59118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 59121725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5913f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5914f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 59158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 59168786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 59178786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 59188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 59198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 59208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 59218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5922890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek QualType To = E->getType()->castAs<ComplexType>()->getElementType(); 59238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 5924890f0f1612b0028b8b16730ae7ed07e295600c76Ted Kremenek = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); 59258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5926c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5927c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5928c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5929c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 59308786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5931ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 59321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 59338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 59349ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 59359ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5936f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 59382ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 59392ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5940745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5941745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5942f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 59431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5944f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5945745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5946f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5947a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 59483f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 59493f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5950ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5951f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 59522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5953a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5954a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5955a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5956a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5957a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5958a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5959a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5960a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5961a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 59623f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 59632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5964a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5965a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5966a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5967a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5968a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5969a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5970a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5971a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5972a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 59733f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 59742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 59753f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5976f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 59773f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 59783f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 59793f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 59803f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 59811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 59823f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 59833f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 59843f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 59853f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 59863f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 59873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 59883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 59893f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 59903f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 59913f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 59923f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 59933f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 59943f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 59953f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5996f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 59971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 59983f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 59993f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 60001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 60013f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 60023f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 60033f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 60043f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 600596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 600696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 600796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 600896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 600996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 601096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 601196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 601296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 601396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 601496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 601596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 601696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 601796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 601896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 601996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 602096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 602196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 602296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 602396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 602496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 602596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 602696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 602796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 602896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 602996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 603096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 603196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 603296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 603396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 603496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 6035f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 6036f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 6037f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 603896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 603996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 604096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 604196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 604296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 604396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 604496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 604596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 604696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 604796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 604896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 6049ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 6050ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 6051f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 6052ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 6053ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 605496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 605596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 605696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 605796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 605896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 605996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 606096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 6061f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 606296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 606396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 606496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 606596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 606696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 606796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 606896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 606996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 607096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 607196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 607296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 607396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 607496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 607596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 607696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 607796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 607896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 607996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 608096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 608196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 608296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 608396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 608496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 608596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 60867ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 60877ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 60887ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 60897ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 60907ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 60917ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 60927ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 60937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 60947ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 60957ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 60967ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 60977ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 60987ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 60997ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 61007ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61017ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 61027ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 61037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 61047ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 61057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 61069ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 6107aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 6108aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 6109aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 6110aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6111aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 6112aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 6113aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 6114aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 6115aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 6116aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 61171aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith bool Success(const APValue &V, const Expr *e) { return true; } 6118aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6119aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 6120aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 6121aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 6122aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 6123aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 6124aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 6125aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 6126aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6127aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 6128aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 6129aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 6130aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6131aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 6132aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 6133aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 6134aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 6135aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 6136aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 613751f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 6138f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 6139f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 61401aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smithstatic bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { 6141c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 6142c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 6143c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 6144c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 6145c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 6146c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 6148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 61491e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 615059b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 6151575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 61521e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 61536dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 6154efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 6155efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 6156efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 61576dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61581e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 6159efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 6160efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 6161efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 61626dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 61631aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith Result = APValue(F); 6164efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 6165efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 6166efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 6167660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 61681e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 616969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 6170e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 6171e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 6172e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 6173e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 6174e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 617551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 6176180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 617783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6178180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6179cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 6180180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 618151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 6182180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 618383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6184180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6185180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 6186180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 6187aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 6188c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 61895cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_constexpr_nonliteral) 6190c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 6191c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 61925cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); 6193aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6194aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 6195c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 61965cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_constexpr_nonliteral) << E->getType(); 6197c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6198f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 61995cfc7d85fe13f144c9a8b264d6de9d38dfebc383Richard Smith Info.Diag(E, diag::note_invalid_subexpr_in_const_expr); 6200660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6201f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6202660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6203660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6204660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6205660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 620683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 620783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 620883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 620983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 621083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 621183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 62127ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 621351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 621451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 621551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 621669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 621769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6218180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6219180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6220180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6221180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 622269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 622369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 622469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 62251aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith return Evaluate(Result, Info, E); 622669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 622769c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6228f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6229f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6230f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 623151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 623251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 623351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 62341aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!::Evaluate(Result, Info, E)) 6235f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6236f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6237f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6238f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 62391aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.setFrom(Info.Ctx, Result); 62401aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) 6241f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6242f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6243f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 62441aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith // Check this core constant expression is a constant expression. 624583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6246f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6247c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 624851f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 624956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 625056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6251c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6252c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 625351f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6254ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6255ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6256ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6257ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6258ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6259ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6260ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6261ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 62622d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 62632d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6264e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 62654e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 62661445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 62671445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6268f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6269f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 627056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 627156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 62724ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 62734ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6274c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 627551f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 62761aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith HandleConversionToBool(Scratch.Val, Result); 6277cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6278cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 627980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 628080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 628180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 628280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 628380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6284c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 628580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 628680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6287c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6288f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6289c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6290c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6291a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6292a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 62934ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 62941b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 62951b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6296efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 629783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 629883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 629983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 630083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 630183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 63021aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith LV.moveInto(Result.Val); 630383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6304b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6305b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6306099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6307099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6308099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 63092d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 63102d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 63112d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 63124e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie !Ctx.getLangOpts().CPlusPlus0x) 63132d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 63142d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6315099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6316099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6317099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6318099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6319099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6320099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6321099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6322099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6323099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 632451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 632551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 632651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 632751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 63284e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() && 632951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 633051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 633183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 633283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 633351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 633451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 633551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 633683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 633783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 633883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 633983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 634083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 634183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 634283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6343099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6344099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 634551f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 634651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 63474ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 63484fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 634951f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 635045b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 635151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 6352a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 63531c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 635451f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6355c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 635651fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 63571c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 635851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 63591c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 636051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6361d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6362e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6363e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6364e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6365e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6366e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6367e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6368d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6369d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6370d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6371d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6372d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6373d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6375d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6376d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6378d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6379d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6380d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6381d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6382d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6383d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6384d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6385d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 638651f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6388d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6389d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6390d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6391d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 63923c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 63933c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6394d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6395d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6396d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6397d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6398d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6399d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6400d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6402d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64033c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 64043c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 64053c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6406d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6407d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6408d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 640951f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6410d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6411d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6412d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6413d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6414d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6415d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6416d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6417d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 64182ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6419d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6420d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6421d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6422d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 642363c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6424d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6426d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6427d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6428d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6429d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6430d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6431d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6432d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6433d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6435d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6436d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6437d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6438d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6439d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6440d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6441d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6442d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6443e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6444d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6445d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 64469be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6447d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 64489fcce65e7e1307b5b8da9be13e4092d6bb94dc1dRichard Smith case Expr::UserDefinedLiteralClass: 6449d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6450d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6451d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6452d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6453d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6454d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6455d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6456d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6457d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 64584765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6459d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6460d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6461d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6462d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6463d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6464eb382ec1507cf2c8c12d7443d0b67c076223aec6Patrick Beard case Expr::ObjCBoxedExprClass: 6465ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCArrayLiteralClass: 6466ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCDictionaryLiteralClass: 6467d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6468d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6469d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6470d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6471d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6472d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6473ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCSubscriptRefExprClass: 6474d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6475d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6476d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6477d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 64787cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6479be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6480c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 648161eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6482f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 648303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 64844b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6485276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6486cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 648701d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6488cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6489cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6490ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6492d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 649591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 649691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 649791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 649891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6500d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6501f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6502f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6503d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6504d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6505ebcb57a8d298862c65043e88b2429591ab3c58d3Ted Kremenek case Expr::ObjCBoolLiteralExprClass: 6506d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6507ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6508d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 65096ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 65104ca8ac2e61c37ddadf37024af86f3e1019af8532Douglas Gregor case Expr::TypeTraitExprClass: 651121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6512552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 65132e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6514d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6515d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 65166cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 651705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 651805830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 651905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6520d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6521180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6522d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6523d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6524d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6525359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith case Expr::DeclRefExprClass: { 6526d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6527d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6528359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith const ValueDecl *D = dyn_cast<ValueDecl>(cast<DeclRefExpr>(E)->getDecl()); 65294e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus && 6530359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith D && IsConstNonVolatile(D->getType())) { 6531d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6537d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6538d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6539d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6540d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6541db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6542db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6543db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6544099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6545099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6546099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6547099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6548099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6549099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6550099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6551d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6552d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6553d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6554359c89df5479810c9d4784fc0b6ab592eb136777Richard Smith } 6555d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6556d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6557d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 65582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 65592de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 65602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 65612de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 65622de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 65632de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 656405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 656505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 656605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6567d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 65682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 65692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 65702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 65712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 65722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 65732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 65742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6575d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6576d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6577d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6578d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6579d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6580d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6581d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 658251f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 658305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6584d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6586d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6587d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6588d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6589f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6590f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6591f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6592f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6593d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6594d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6595d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6596d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6597d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6598d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 65992de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 66002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 66012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 66022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 66032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 66042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 66052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 66062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 66072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 66082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 66092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 66102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 66112de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 661205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 661305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 661405830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 66172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 66182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 66192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 66202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 66212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 66222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 66232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 66242de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 66252de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 66262de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 66272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 66282de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 66292de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 66302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 66312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 66322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 66332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6634d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6635d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 66362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 66372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 663851f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6639d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 66403b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6641a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6642d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6643d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6644d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6645a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6646d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6647d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6648d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6649d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6650d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 66512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 66524e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().C99) { 6653d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6654d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6655d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6656d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6657d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6658d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6659d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6660d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6661d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6662d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6663d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6664d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6665d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 66662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 66672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6668d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6669d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6670d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6671d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6672d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6673d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 66742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6675a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6676d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6677d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6678d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6679d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6680d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6681d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6682d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6683d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6684d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6685d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6686d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6687d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6688d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6689d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6690d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 669132cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6692f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6693d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 66942116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 66952116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 66962116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 66972116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 66982116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 66992116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 67002116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 67012116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 67022116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 67032116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 67042116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 67052116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 67062116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 67072116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 67082116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 67092116b144cf07f2574d20517187eb8863645376ebRichard Smith } 67102116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6711eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6712eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 67137a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 67147a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6715eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6716eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6717eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6718d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6719eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6720eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6721eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6722d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 672356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 672456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 672556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 672656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 672756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 672856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 672956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 673056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6731a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 673256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 673356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6734d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6735d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6736d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6737d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6738d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6739d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6740d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6741d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 674280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 674380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6744d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6745d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6746d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 674763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6748f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6749f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 675063fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6751d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6752d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6753d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6754d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6755d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6756d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6757d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6758d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6759d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6760d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6761d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6762a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6763d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6764d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6765d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6766d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6767d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6768d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6769d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6770d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6771d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6772d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6773d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 67743026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6775d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6776d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6777f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6778f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6779f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6780f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6781f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6782f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6783f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6784f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6785f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6786f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 67874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 67884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6789dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6790dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 67914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 67924c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6793dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6794f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6795f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6796dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 67974e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6798f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6799f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6800d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6801d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6802d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6803d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6804d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6805f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6806f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6807f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6808f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6809f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 68104e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (Ctx.getLangOpts().CPlusPlus0x) 6811f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6812f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6813f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6814f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6815f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6816d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6817d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6818d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 68194c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 682070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 682170488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 682270488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 682370488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 68244c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 68254c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 68264c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 68274c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 68284e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie assert(Ctx.getLangOpts().CPlusPlus); 68294c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 683070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 68314c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 68324c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 68334c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 68344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 68354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68364c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 68374c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 68384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 68404c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 68414c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 68424c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 68434c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 68444c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 68454c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 68464c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 68474c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 68484c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6849745f5147e065900267c85a5568785a1991d4838fRichard Smith 6850745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6851745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6852745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6853745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6854745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6855745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6856745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6857745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6858745f5147e065900267c85a5568785a1991d4838fRichard Smith 6859745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6860745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6861745f5147e065900267c85a5568785a1991d4838fRichard Smith 6862745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6863745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6864745f5147e065900267c85a5568785a1991d4838fRichard Smith 6865745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6866745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6867745f5147e065900267c85a5568785a1991d4838fRichard Smith 6868745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6869745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6870745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6871745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 687283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6873745f5147e065900267c85a5568785a1991d4838fRichard Smith 6874745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6875745f5147e065900267c85a5568785a1991d4838fRichard Smith 6876745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6877745f5147e065900267c85a5568785a1991d4838fRichard Smith 68781aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith APValue Scratch; 68791aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 6880745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 68811aa0be86358002fe876e5a4a00c3038c96be28eeRichard Smith else 6882745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6883745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 6884745f5147e065900267c85a5568785a1991d4838fRichard Smith 6885745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6886745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6887