ExprConstant.cpp revision 24fe798fffc1748d8bce1321af42981c3719cb85
1b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner//===--- ExprConstant.cpp - Expression Constant Evaluator -----------------===// 2c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 3c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// The LLVM Compiler Infrastructure 4c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 5c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file is distributed under the University of Illinois Open Source 6c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// License. See LICENSE.TXT for details. 7c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 8c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 9c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 10c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// This file implements the Expr constant evaluator. 11c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson// 12745f5147e065900267c85a5568785a1991d4838fRichard Smith// Constant expression evaluation produces four main results: 13745f5147e065900267c85a5568785a1991d4838fRichard Smith// 14745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A success/failure flag indicating whether constant folding was successful. 15745f5147e065900267c85a5568785a1991d4838fRichard Smith// This is the 'bool' return value used by most of the code in this file. A 16745f5147e065900267c85a5568785a1991d4838fRichard Smith// 'false' return value indicates that constant folding has failed, and any 17745f5147e065900267c85a5568785a1991d4838fRichard Smith// appropriate diagnostic has already been produced. 18745f5147e065900267c85a5568785a1991d4838fRichard Smith// 19745f5147e065900267c85a5568785a1991d4838fRichard Smith// * An evaluated result, valid only if constant folding has not failed. 20745f5147e065900267c85a5568785a1991d4838fRichard Smith// 21745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A flag indicating if evaluation encountered (unevaluated) side-effects. 22745f5147e065900267c85a5568785a1991d4838fRichard Smith// These arise in cases such as (sideEffect(), 0) and (sideEffect() || 1), 23745f5147e065900267c85a5568785a1991d4838fRichard Smith// where it is possible to determine the evaluated result regardless. 24745f5147e065900267c85a5568785a1991d4838fRichard Smith// 25745f5147e065900267c85a5568785a1991d4838fRichard Smith// * A set of notes indicating why the evaluation was not a constant expression 26745f5147e065900267c85a5568785a1991d4838fRichard Smith// (under the C++11 rules only, at the moment), or, if folding failed too, 27745f5147e065900267c85a5568785a1991d4838fRichard Smith// why the expression could not be folded. 28745f5147e065900267c85a5568785a1991d4838fRichard Smith// 29745f5147e065900267c85a5568785a1991d4838fRichard Smith// If we are checking for a potential constant expression, failure to constant 30745f5147e065900267c85a5568785a1991d4838fRichard Smith// fold a potential constant sub-expression will be indicated by a 'false' 31745f5147e065900267c85a5568785a1991d4838fRichard Smith// return value (the expression could not be folded) and no diagnostic (the 32745f5147e065900267c85a5568785a1991d4838fRichard Smith// expression is not necessarily non-constant). 33745f5147e065900267c85a5568785a1991d4838fRichard Smith// 34c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson//===----------------------------------------------------------------------===// 35c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 36c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/APValue.h" 37c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson#include "clang/AST/ASTContext.h" 38199c3d6cd16aebbb9c7f0d42af9d922c9628bf70Ken Dyck#include "clang/AST/CharUnits.h" 3919cc4abea06a9b49e0e16a50d335c064cd723572Anders Carlsson#include "clang/AST/RecordLayout.h" 400fe52e1bcaa69ba127f1bda036f057fec1f478deSeo Sanghyeon#include "clang/AST/StmtVisitor.h" 418ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/TypeLoc.h" 42500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/AST/ASTDiagnostic.h" 438ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor#include "clang/AST/Expr.h" 441b63e4f732dbc73d90abf886b4d21f8e3a165f6dChris Lattner#include "clang/Basic/Builtins.h" 4506a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson#include "clang/Basic/TargetInfo.h" 467462b39a9bccaf4392687831036713f09f9c0681Mike Stump#include "llvm/ADT/SmallString.h" 474572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump#include <cstring> 487b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith#include <functional> 494572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump 50c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlssonusing namespace clang; 51f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerusing llvm::APSInt; 52d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanusing llvm::APFloat; 53c44eec6dd29ee9415cbd38a35deff4c8b67abb6aAnders Carlsson 5483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool IsGlobalLValue(APValue::LValueBase B); 5583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 56c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramernamespace { 57180f47959a066795cc0f409433023af448bb0328Richard Smith struct LValue; 58d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith struct CallStackFrame; 59bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct EvalInfo; 60d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 6183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static QualType getType(APValue::LValueBase B) { 621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return QualType(); 631bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) 641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return D->getType(); 651bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return B.get<const Expr*>()->getType(); 661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } 671bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 68180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 69f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field or base class. 7083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static 71f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith APValue::BaseOrMemberType getAsBaseOrMember(APValue::LValuePathEntry E) { 72180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value; 73180f47959a066795cc0f409433023af448bb0328Richard Smith Value.setFromOpaqueValue(E.BaseOrMember); 74f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return Value; 75f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 76f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 77f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 78f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// field declaration. 7983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const FieldDecl *getAsField(APValue::LValuePathEntry E) { 80f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<FieldDecl>(getAsBaseOrMember(E).getPointer()); 81180f47959a066795cc0f409433023af448bb0328Richard Smith } 82180f47959a066795cc0f409433023af448bb0328Richard Smith /// Get an LValue path entry, which is known to not be an array index, as a 83180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class declaration. 8483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { 85f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return dyn_cast<CXXRecordDecl>(getAsBaseOrMember(E).getPointer()); 86180f47959a066795cc0f409433023af448bb0328Richard Smith } 87180f47959a066795cc0f409433023af448bb0328Richard Smith /// Determine whether this LValue path entry for a base class names a virtual 88180f47959a066795cc0f409433023af448bb0328Richard Smith /// base class. 8983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith static bool isVirtualBaseClass(APValue::LValuePathEntry E) { 90f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return getAsBaseOrMember(E).getInt(); 91180f47959a066795cc0f409433023af448bb0328Richard Smith } 92180f47959a066795cc0f409433023af448bb0328Richard Smith 93b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Find the path length and type of the most-derived subobject in the given 94b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// path, and find the size of the containing array, if any. 95b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith static 96b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned findMostDerivedSubobject(ASTContext &Ctx, QualType Base, 97b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArrayRef<APValue::LValuePathEntry> Path, 98b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t &ArraySize, QualType &Type) { 99b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedLength = 0; 100b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = Base; 1019a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith for (unsigned I = 0, N = Path.size(); I != N; ++I) { 102b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Type->isArrayType()) { 103b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const ConstantArrayType *CAT = 104b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith cast<ConstantArrayType>(Ctx.getAsArrayType(Type)); 105b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = CAT->getElementType(); 106b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = CAT->getSize().getZExtValue(); 107b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 10886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (Type->isAnyComplexType()) { 10986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith const ComplexType *CT = Type->castAs<ComplexType>(); 11086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Type = CT->getElementType(); 11186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ArraySize = 2; 11286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedLength = I + 1; 113b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else if (const FieldDecl *FD = getAsField(Path[I])) { 114b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Type = FD->getType(); 115b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 116b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedLength = I + 1; 117b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } else { 1189a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith // Path[I] describes a base class. 119b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith ArraySize = 0; 120b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1219a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return MostDerivedLength; 1239a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1249a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 125b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // The order of this enum is important for diagnostics. 126b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith enum CheckSubobjectKind { 127b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith CSK_Base, CSK_Derived, CSK_Field, CSK_ArrayToPointer, CSK_ArrayIndex, 12886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CSK_This, CSK_Real, CSK_Imag 129b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith }; 130b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1310a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// A path from a glvalue to a subobject of that glvalue. 1320a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith struct SubobjectDesignator { 1330a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// True if the subobject was named in a manner not supported by C++11. Such 1340a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// lvalues can still be folded, but they are not core constant expressions 1350a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// and we cannot perform lvalue-to-rvalue conversions on them. 1360a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith bool Invalid : 1; 1370a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 138b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Is this a pointer one past the end of an object? 139b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool IsOnePastTheEnd : 1; 140b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 141b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The length of the path to the most-derived object of which this is a 142b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// subobject. 143b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned MostDerivedPathLength : 30; 144b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 145b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The size of the array of which the most-derived object is an element, or 146b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// 0 if the most-derived object is not an array element. 147b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith uint64_t MostDerivedArraySize; 1480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 149b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// The type of the most derived object referred to by this address. 150b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith QualType MostDerivedType; 1510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 1529a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith typedef APValue::LValuePathEntry PathEntry; 1539a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1540a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// The entries on the path from the glvalue to the designated subobject. 1550a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SmallVector<PathEntry, 8> Entries; 1560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 157b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator() : Invalid(true) {} 1580a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 159b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith explicit SubobjectDesignator(QualType T) 160b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(false), IsOnePastTheEnd(false), MostDerivedPathLength(0), 161b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize(0), MostDerivedType(T) {} 162b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 163b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator(ASTContext &Ctx, const APValue &V) 164b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), 165b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength(0), MostDerivedArraySize(0) { 1669a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!Invalid) { 167b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = V.isLValueOnePastTheEnd(); 1689a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith ArrayRef<PathEntry> VEntries = V.getLValuePath(); 1699a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); 1709a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (V.getLValueBase()) 171b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = 172b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith findMostDerivedSubobject(Ctx, getType(V.getLValueBase()), 173b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith V.getLValuePath(), MostDerivedArraySize, 174b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType); 1759a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1769a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 1779a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 1780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith void setInvalid() { 1790a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Invalid = true; 1800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.clear(); 1810a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 182b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 183b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Determine whether this is a one-past-the-end pointer. 184b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isOnePastTheEnd() const { 185b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd) 186b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 187b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedArraySize && 188b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entries[MostDerivedPathLength - 1].ArrayIndex == MostDerivedArraySize) 189b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 190b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 191b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 192b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 193b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject. 194b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool isValidSubobject() const { 195b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 196b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 197b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return !isOnePastTheEnd(); 198b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 199b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Check that this refers to a valid subobject, and if not, produce a 200b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// relevant diagnostic and set the designator as invalid. 201b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); 202b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 203b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith /// Update this designator to refer to the first element within this array. 204b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArrayUnchecked(const ConstantArrayType *CAT) { 2050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 206b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Entry.ArrayIndex = 0; 2070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 208b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 209b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // This is a most-derived object. 210b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = CAT->getElementType(); 211b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = CAT->getSize().getZExtValue(); 212b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 2130a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2140a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Update this designator to refer to the given base or member of this 2150a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// object. 216b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDeclUnchecked(const Decl *D, bool Virtual = false) { 2170a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith PathEntry Entry; 218180f47959a066795cc0f409433023af448bb0328Richard Smith APValue::BaseOrMemberType Value(D, Virtual); 219180f47959a066795cc0f409433023af448bb0328Richard Smith Entry.BaseOrMember = Value.getOpaqueValue(); 2200a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Entries.push_back(Entry); 221b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 222b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // If this isn't a base class, it's a new most-derived object. 223b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedType = FD->getType(); 225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedArraySize = 0; 226b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith MostDerivedPathLength = Entries.size(); 227b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2280a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 22986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith /// Update this designator to refer to the given complex component. 23086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplexUnchecked(QualType EltTy, bool Imag) { 23186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith PathEntry Entry; 23286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entry.ArrayIndex = Imag; 23386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Entries.push_back(Entry); 23486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 23586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // This is technically a most-derived object, though in practice this 23686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // is unlikely to matter. 23786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedType = EltTy; 23886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedArraySize = 2; 23986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith MostDerivedPathLength = Entries.size(); 24086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 241b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, uint64_t N); 2420a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// Add N to the address of this subobject. 243b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 2440a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (Invalid) return; 245b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) { 2469a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith Entries.back().ArrayIndex += N; 247b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Entries.back().ArrayIndex > MostDerivedArraySize) { 248b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, Entries.back().ArrayIndex); 249b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 250b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return; 2520a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 253b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // [expr.add]p4: For the purposes of these operators, a pointer to a 254b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // nonarray object behaves the same as a pointer to the first element of 255b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an array of length one with the type of the object as its element type. 256b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (IsOnePastTheEnd && N == (uint64_t)-1) 257b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = false; 258b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (!IsOnePastTheEnd && N == 1) 259b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith IsOnePastTheEnd = true; 260b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else if (N != 0) { 261b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith diagnosePointerArithmetic(Info, E, uint64_t(IsOnePastTheEnd) + N); 2620a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith setInvalid(); 263b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2640a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 2650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith }; 2660a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 26747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// A core constant value. This can be the value of any constant expression, 26847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith /// or a pointer or reference to a non-static object or function parameter. 269e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// 270e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// For an LValue, the base and offset are stored in the APValue subobject, 271e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// but the other information is stored in the SubobjectDesignator. For all 272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// other value kinds, the value is stored directly in the APValue subobject. 27347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith class CCValue : public APValue { 27447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APSInt APSInt; 27547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::APFloat APFloat; 2760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// If the value is a reference or pointer, this is a description of how the 2770a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith /// subobject was specified. 2780a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 27947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith public: 280177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith struct GlobalValue {}; 281177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith 28247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue() {} 28347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APSInt &I) : APValue(I) {} 28447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith explicit CCValue(const APFloat &F) : APValue(F) {} 28547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APValue *E, unsigned N) : APValue(E, N) {} 28647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APSInt &R, const APSInt &I) : APValue(R, I) {} 28747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue(const APFloat &R, const APFloat &I) : APValue(R, I) {} 28883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(const CCValue &V) : APValue(V), Designator(V.Designator) {} 28983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue(LValueBase B, const CharUnits &O, unsigned I, 2900a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &D) : 29183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(B, O, APValue::NoLValuePath(), I), Designator(D) {} 292b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue(ASTContext &Ctx, const APValue &V, GlobalValue) : 29383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue(V), Designator(Ctx, V) { 29483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 295e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue(const ValueDecl *D, bool IsDerivedMember, 296e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> Path) : 297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith APValue(D, IsDerivedMember, Path) {} 29865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman CCValue(const AddrLabelExpr* LHSExpr, const AddrLabelExpr* RHSExpr) : 29965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman APValue(LHSExpr, RHSExpr) {} 30047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 3010a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { 3020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(getKind() == LValue); 3030a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return Designator; 3040a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 3050a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { 3060a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return const_cast<CCValue*>(this)->getLValueDesignator(); 3070a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 30883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue toAPValue() const { 30983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!isLValue()) 31083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return *this; 31183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 31283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Designator.Invalid) { 31383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // This is not a core constant expression. An appropriate diagnostic 31483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // will have already been produced. 31583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 31683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue::NoLValuePath(), getLValueCallIndex()); 31783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 31883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 31983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return APValue(getLValueBase(), getLValueOffset(), 32083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Designator.Entries, Designator.IsOnePastTheEnd, 32183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith getLValueCallIndex()); 32283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 32347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith }; 32447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 325bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// A stack frame in the constexpr call stack. 326bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith struct CallStackFrame { 327bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo &Info; 328bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 329bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Parent - The caller of this stack frame. 330bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *Caller; 331bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 33208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// CallLoc - The location of the call expression for this call. 33308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SourceLocation CallLoc; 33408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 33508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Callee - The function which was called. 33608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee; 33708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 33883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// Index - The call index of this call. 33983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned Index; 34083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 341180f47959a066795cc0f409433023af448bb0328Richard Smith /// This - The binding for the this pointer in this call, if any. 342180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue *This; 343180f47959a066795cc0f409433023af448bb0328Richard Smith 344bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// ParmBindings - Parameter bindings for this function call, indexed by 345bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// parameters' function scope indices. 346bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const CCValue *Arguments; 347bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 348bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef llvm::DenseMap<const Expr*, CCValue> MapTy; 349bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith typedef MapTy::const_iterator temp_iterator; 350bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// Temporaries - Temporary lvalues materialized within this stack frame. 351bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith MapTy Temporaries; 352bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 35308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 35408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 355180f47959a066795cc0f409433023af448bb0328Richard Smith const CCValue *Arguments); 356bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith ~CallStackFrame(); 357bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith }; 358bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 359dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// A partial diagnostic which we might know in advance that we are not going 360dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// to emit. 361dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith class OptionalDiagnostic { 362dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith PartialDiagnostic *Diag; 363dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 364dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith public: 365dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith explicit OptionalDiagnostic(PartialDiagnostic *Diag = 0) : Diag(Diag) {} 366dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 367dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith template<typename T> 368dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic &operator<<(const T &v) { 369dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (Diag) 370dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith *Diag << v; 371dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return *this; 372dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 373789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 374789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APSInt &I) { 375789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 376789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 377789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith I.toString(Buffer); 378789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 379789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 380789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 381789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 382789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 383789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith OptionalDiagnostic &operator<<(const APFloat &F) { 384789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Diag) { 385789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith llvm::SmallVector<char, 32> Buffer; 386789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith F.toString(Buffer); 387789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith *Diag << StringRef(Buffer.data(), Buffer.size()); 388789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 389789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return *this; 390789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 391dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith }; 392dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 39383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// EvalInfo - This is a private struct used by the evaluator to capture 39483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// information about a subexpression as it is folded. It retains information 39583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// about the AST context, but also maintains information about the folded 39683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// expression. 39783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 39883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// If an expression could be evaluated, it is still possible it is not a C 39983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// "integer constant expression" or constant expression. If not, this struct 40083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// captures information about how and why not. 40183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// 40283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// One bit of information passed *into* the request for constant folding 40383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// indicates whether the subexpression is "evaluated" or not according to C 40483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can 40583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// evaluate the expression regardless of what the RHS is, but C only allows 40683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// certain things in certain situations. 407c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer struct EvalInfo { 408dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith ASTContext &Ctx; 4091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4101e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith /// EvalStatus - Contains information about the evaluation. 4111e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith Expr::EvalStatus &EvalStatus; 412f0c1e4b679e15c26bffb5892e35985bf3c52f77aAnders Carlsson 413d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CurrentCall - The top of the constexpr call stack. 414bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame *CurrentCall; 415d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 416d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// CallStackDepth - The number of calls in the call stack right now. 417d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith unsigned CallStackDepth; 418d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 41983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /// NextCallIndex - The next call index to assign. 42083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned NextCallIndex; 42183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 42247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith typedef llvm::DenseMap<const OpaqueValueExpr*, CCValue> MapTy; 423bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// OpaqueValues - Values used as the common expression in a 424bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BinaryConditionalOperator. 425c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy OpaqueValues; 426bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 427bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith /// BottomFrame - The frame in which evaluation started. This must be 428745f5147e065900267c85a5568785a1991d4838fRichard Smith /// initialized after CurrentCall and CallStackDepth. 429bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith CallStackFrame BottomFrame; 430bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 431180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDecl - This is the declaration whose initializer is being 432180f47959a066795cc0f409433023af448bb0328Richard Smith /// evaluated, if any. 433180f47959a066795cc0f409433023af448bb0328Richard Smith const VarDecl *EvaluatingDecl; 434180f47959a066795cc0f409433023af448bb0328Richard Smith 435180f47959a066795cc0f409433023af448bb0328Richard Smith /// EvaluatingDeclValue - This is the value being constructed for the 436180f47959a066795cc0f409433023af448bb0328Richard Smith /// declaration whose initializer is being evaluated, if any. 437180f47959a066795cc0f409433023af448bb0328Richard Smith APValue *EvaluatingDeclValue; 438180f47959a066795cc0f409433023af448bb0328Richard Smith 439c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further 440c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// notes attached to it will also be stored, otherwise they will not be. 441c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool HasActiveDiagnostic; 442c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 443745f5147e065900267c85a5568785a1991d4838fRichard Smith /// CheckingPotentialConstantExpression - Are we checking whether the 444745f5147e065900267c85a5568785a1991d4838fRichard Smith /// expression is a potential constant expression? If so, some diagnostics 445745f5147e065900267c85a5568785a1991d4838fRichard Smith /// are suppressed. 446745f5147e065900267c85a5568785a1991d4838fRichard Smith bool CheckingPotentialConstantExpression; 447745f5147e065900267c85a5568785a1991d4838fRichard Smith 448bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 449bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith EvalInfo(const ASTContext &C, Expr::EvalStatus &S) 450dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0), 45183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackDepth(0), NextCallIndex(1), 45283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith BottomFrame(*this, SourceLocation(), 0, 0, 0), 453745f5147e065900267c85a5568785a1991d4838fRichard Smith EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false), 454745f5147e065900267c85a5568785a1991d4838fRichard Smith CheckingPotentialConstantExpression(false) {} 455bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 45647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const { 457c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer MapTy::const_iterator i = OpaqueValues.find(e); 458c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer if (i == OpaqueValues.end()) return 0; 459c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer return &i->second; 460c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer } 46156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 462180f47959a066795cc0f409433023af448bb0328Richard Smith void setEvaluatingDecl(const VarDecl *VD, APValue &Value) { 463180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDecl = VD; 464180f47959a066795cc0f409433023af448bb0328Richard Smith EvaluatingDeclValue = &Value; 465180f47959a066795cc0f409433023af448bb0328Richard Smith } 466180f47959a066795cc0f409433023af448bb0328Richard Smith 467c18c42345636e2866fed75c7e434fb659d747672Richard Smith const LangOptions &getLangOpts() const { return Ctx.getLangOptions(); } 468c18c42345636e2866fed75c7e434fb659d747672Richard Smith 469c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith bool CheckCallLimit(SourceLocation Loc) { 470745f5147e065900267c85a5568785a1991d4838fRichard Smith // Don't perform any constexpr calls (other than the call we're checking) 471745f5147e065900267c85a5568785a1991d4838fRichard Smith // when checking a potential constant expression. 472745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression && CallStackDepth > 1) 473745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 47483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (NextCallIndex == 0) { 47583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // NextCallIndex has wrapped around. 47683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Diag(Loc, diag::note_constexpr_call_limit_exceeded); 47783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 47883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 479c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (CallStackDepth <= getLangOpts().ConstexprCallDepth) 480c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 481c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Diag(Loc, diag::note_constexpr_depth_limit_exceeded) 482c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << getLangOpts().ConstexprCallDepth; 483c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 484c18c42345636e2866fed75c7e434fb659d747672Richard Smith } 485f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 48683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *getCallFrame(unsigned CallIndex) { 48783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(CallIndex && "no call index in getCallFrame"); 48883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // We will eventually hit BottomFrame, which has Index 1, so Frame can't 48983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // be null in this loop. 49083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = CurrentCall; 49183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith while (Frame->Index > CallIndex) 49283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Frame->Caller; 49383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return (Frame->Index == CallIndex) ? Frame : 0; 49483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 49583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 496c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith private: 497c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a diagnostic to the diagnostics list. 498c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic &addDiag(SourceLocation Loc, diag::kind DiagId) { 499c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith PartialDiagnostic PD(DiagId, Ctx.getDiagAllocator()); 500c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith EvalStatus.Diag->push_back(std::make_pair(Loc, PD)); 501c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvalStatus.Diag->back().second; 502c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 503c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 50408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith /// Add notes containing a call stack to the current point of evaluation. 50508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith void addCallStack(unsigned Limit); 50608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 507c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith public: 508f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Diagnose that the evaluation cannot be folded. 5097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic Diag(SourceLocation Loc, diag::kind DiagId 5107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 511c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 512f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // If we have a prior diagnostic, it will be noting that the expression 513f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // isn't a constant expression. This diagnostic is more important. 514f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: We might want to show both diagnostics to the user. 515dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (EvalStatus.Diag) { 51608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallStackNotes = CallStackDepth - 1; 51708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned Limit = Ctx.getDiagnostics().getConstexprBacktraceLimit(); 51808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit) 51908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith CallStackNotes = std::min(CallStackNotes, Limit + 1); 520745f5147e065900267c85a5568785a1991d4838fRichard Smith if (CheckingPotentialConstantExpression) 521745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackNotes = 0; 52208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 523c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = true; 524dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith EvalStatus.Diag->clear(); 52508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith EvalStatus.Diag->reserve(1 + ExtraNotes + CallStackNotes); 52608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Loc, DiagId); 527745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!CheckingPotentialConstantExpression) 528745f5147e065900267c85a5568785a1991d4838fRichard Smith addCallStack(Limit); 52908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith return OptionalDiagnostic(&(*EvalStatus.Diag)[0].second); 530dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 531c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HasActiveDiagnostic = false; 532dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 533dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith } 534dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 535dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// Diagnose that the evaluation does not produce a C++11 core constant 536dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith /// expression. 5377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith OptionalDiagnostic CCEDiag(SourceLocation Loc, diag::kind DiagId 5387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith = diag::note_invalid_subexpr_in_const_expr, 539c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned ExtraNotes = 0) { 540dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith // Don't override a previous diagnostic. 541dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith if (!EvalStatus.Diag || !EvalStatus.Diag->empty()) 542dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return OptionalDiagnostic(); 543c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Diag(Loc, DiagId, ExtraNotes); 544c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 545c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 546c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Add a note to a prior diagnostic. 547c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith OptionalDiagnostic Note(SourceLocation Loc, diag::kind DiagId) { 548c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HasActiveDiagnostic) 549c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(); 550c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return OptionalDiagnostic(&addDiag(Loc, DiagId)); 551f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 552099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 553099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith /// Add a stack of notes to a prior diagnostic. 554099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith void addNotes(ArrayRef<PartialDiagnosticAt> Diags) { 555099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (HasActiveDiagnostic) { 556099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalStatus.Diag->insert(EvalStatus.Diag->end(), 557099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Diags.begin(), Diags.end()); 558099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 559099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 560745f5147e065900267c85a5568785a1991d4838fRichard Smith 561745f5147e065900267c85a5568785a1991d4838fRichard Smith /// Should we continue evaluation as much as possible after encountering a 562745f5147e065900267c85a5568785a1991d4838fRichard Smith /// construct which can't be folded? 563745f5147e065900267c85a5568785a1991d4838fRichard Smith bool keepEvaluatingAfterFailure() { 56474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return CheckingPotentialConstantExpression && 56574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalStatus.Diag && EvalStatus.Diag->empty(); 566745f5147e065900267c85a5568785a1991d4838fRichard Smith } 567c54061a679d8db4169438b2f97f81e3f443c6a25Benjamin Kramer }; 568f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 569f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith /// Object used to treat all foldable expressions as constant expressions. 570f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith struct FoldConstant { 571f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool Enabled; 572f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 573f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith explicit FoldConstant(EvalInfo &Info) 574f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith : Enabled(Info.EvalStatus.Diag && Info.EvalStatus.Diag->empty() && 575f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) { 576f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 577f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Treat the value we've computed since this object was created as constant. 578f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith void Fold(EvalInfo &Info) { 579f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Enabled && !Info.EvalStatus.Diag->empty() && 580f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !Info.EvalStatus.HasSideEffects) 581f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Info.EvalStatus.Diag->clear(); 582f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 583f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith }; 58474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 58574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// RAII object used to suppress diagnostics and side-effects from a 58674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith /// speculative evaluation. 58774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith class SpeculativeEvaluationRAII { 58874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith EvalInfo &Info; 58974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr::EvalStatus Old; 59074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 59174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith public: 59274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII(EvalInfo &Info, 59374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> 59474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith *NewDiag = 0) 59574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith : Info(Info), Old(Info.EvalStatus) { 59674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.Diag = NewDiag; 59774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 59874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith ~SpeculativeEvaluationRAII() { 59974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus = Old; 60074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 60174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith }; 60208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 60308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 604b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithbool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, 605b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 606b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Invalid) 607b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 608b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (isOnePastTheEnd()) { 609b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_past_end_subobject) 610b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 611b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 612b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 613b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 614b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 615b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 616b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 617b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithvoid SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, 618b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Expr *E, uint64_t N) { 619b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (MostDerivedPathLength == Entries.size() && MostDerivedArraySize) 620b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 621b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*array*/ 0 622b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<unsigned>(MostDerivedArraySize); 623b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 624b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_array_index) 625b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << static_cast<int>(N) << /*non-array*/ 1; 626b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith setInvalid(); 627b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith} 628b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 62908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, 63008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const FunctionDecl *Callee, const LValue *This, 63108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue *Arguments) 63208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith : Info(Info), Caller(Info.CurrentCall), CallLoc(CallLoc), Callee(Callee), 63383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Index(Info.NextCallIndex++), This(This), Arguments(Arguments) { 63408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = this; 63508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith ++Info.CallStackDepth; 63608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 63708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 63808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard SmithCallStackFrame::~CallStackFrame() { 63908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith assert(Info.CurrentCall == this && "calls retired out of order"); 64008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith --Info.CallStackDepth; 64108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Info.CurrentCall = Caller; 64208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 64387eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 64408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith/// Produce a string describing the given constexpr call. 64508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithstatic void describeCall(CallStackFrame *Frame, llvm::raw_ostream &Out) { 64608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ArgIndex = 0; 64708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith bool IsMemberCall = isa<CXXMethodDecl>(Frame->Callee) && 6485ba73e1af8ef519161bd40063dc325457e21676aRichard Smith !isa<CXXConstructorDecl>(Frame->Callee) && 6495ba73e1af8ef519161bd40063dc325457e21676aRichard Smith cast<CXXMethodDecl>(Frame->Callee)->isInstance(); 65008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!IsMemberCall) 65208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << *Frame->Callee << '('; 65308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (FunctionDecl::param_const_iterator I = Frame->Callee->param_begin(), 65508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith E = Frame->Callee->param_end(); I != E; ++I, ++ArgIndex) { 6565fe31228c883040cf016cfc71ad4bfeba462602eNAKAMURA Takumi if (ArgIndex > (unsigned)IsMemberCall) 65708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ", "; 65808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 65908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const ParmVarDecl *Param = *I; 66008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith const CCValue &Arg = Frame->Arguments[ArgIndex]; 66108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (!Arg.isLValue() || Arg.getLValueDesignator().Invalid) 66208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.printPretty(Out, Frame->Info.Ctx, Param->getType()); 66308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith else { 66483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Convert the CCValue to an APValue without checking for constantness. 66508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith APValue Value(Arg.getLValueBase(), Arg.getLValueOffset(), 66608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Arg.getLValueDesignator().Entries, 66783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueDesignator().IsOnePastTheEnd, 66883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Arg.getLValueCallIndex()); 66908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Value.printPretty(Out, Frame->Info.Ctx, Param->getType()); 67008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 67108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 67208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (ArgIndex == 0 && IsMemberCall) 67308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << "->" << *Frame->Callee << '('; 674bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 675d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 67608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Out << ')'; 67708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 67808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 67908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithvoid EvalInfo::addCallStack(unsigned Limit) { 68008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Determine which calls to skip, if any. 68108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned ActiveCalls = CallStackDepth - 1; 68208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned SkipStart = ActiveCalls, SkipEnd = SkipStart; 68308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (Limit && Limit < ActiveCalls) { 68408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipStart = Limit / 2 + Limit % 2; 68508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith SkipEnd = ActiveCalls - Limit / 2; 68608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 68708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 68808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Walk the call stack and add the diagnostics. 68908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith unsigned CallIdx = 0; 69008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith for (CallStackFrame *Frame = CurrentCall; Frame != &BottomFrame; 69108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith Frame = Frame->Caller, ++CallIdx) { 69208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Skip this call? 69308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx >= SkipStart && CallIdx < SkipEnd) { 69408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith if (CallIdx == SkipStart) { 69508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith // Note that we're skipping calls. 69608d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_calls_suppressed) 69708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith << unsigned(ActiveCalls - Limit); 69808d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 69908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith continue; 70008d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith } 70108d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith 70208d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::SmallVector<char, 128> Buffer; 70308d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith llvm::raw_svector_ostream Out(Buffer); 70408d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith describeCall(Frame, Out); 70508d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith addDiag(Frame->CallLoc, diag::note_constexpr_call_here) << Out.str(); 706bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith } 70708d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smith} 708d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 70908d6e032a2a0a8656d12b3b7b93942987bb12eb7Richard Smithnamespace { 710f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall struct ComplexValue { 711f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall private: 712f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool IsInt; 713f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 714f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall public: 715f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt IntReal, IntImag; 716f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat FloatReal, FloatImag; 717f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 718f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue() : FloatReal(APFloat::Bogus), FloatImag(APFloat::Bogus) {} 719f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 720f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexFloat() { IsInt = false; } 721f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexFloat() const { return !IsInt; } 722f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatReal() { return FloatReal; } 723f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APFloat &getComplexFloatImag() { return FloatImag; } 724f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 725f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall void makeComplexInt() { IsInt = true; } 726f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall bool isComplexInt() const { return IsInt; } 727f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntReal() { return IntReal; } 728f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall APSInt &getComplexIntImag() { return IntImag; } 729f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall 73047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &v) const { 731f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall if (isComplexFloat()) 73247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(FloatReal, FloatImag); 733f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall else 73447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith v = CCValue(IntReal, IntImag); 735f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall } 73647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &v) { 73756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall assert(v.isComplexFloat() || v.isComplexInt()); 73856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (v.isComplexFloat()) { 73956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexFloat(); 74056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatReal = v.getComplexFloatReal(); 74156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall FloatImag = v.getComplexFloatImag(); 74256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } else { 74356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall makeComplexInt(); 74456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntReal = v.getComplexIntReal(); 74556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall IntImag = v.getComplexIntImag(); 74656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 74756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 748f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall }; 749efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 750efdb83e26f9a1fd2566afe54461216cd84814d42John McCall struct LValue { 7511bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith APValue::LValueBase Base; 752efdb83e26f9a1fd2566afe54461216cd84814d42John McCall CharUnits Offset; 75383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned CallIndex; 7540a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator Designator; 755efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 7561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const APValue::LValueBase getLValueBase() const { return Base; } 75747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CharUnits &getLValueOffset() { return Offset; } 758625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const CharUnits &getLValueOffset() const { return Offset; } 75983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned getLValueCallIndex() const { return CallIndex; } 7600a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith SubobjectDesignator &getLValueDesignator() { return Designator; } 7610a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith const SubobjectDesignator &getLValueDesignator() const { return Designator;} 762efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 76347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void moveInto(CCValue &V) const { 76483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith V = CCValue(Base, Offset, CallIndex, Designator); 765efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 76647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith void setFrom(const CCValue &V) { 76747a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith assert(V.isLValue()); 76847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Base = V.getLValueBase(); 76947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Offset = V.getLValueOffset(); 77083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = V.getLValueCallIndex(); 7710a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Designator = V.getLValueDesignator(); 7720a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 7730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith 77483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith void set(APValue::LValueBase B, unsigned I = 0) { 7751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = B; 7760a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Offset = CharUnits::Zero(); 77783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallIndex = I; 778b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator = SubobjectDesignator(getType(B)); 779b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 780b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 781b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check that this LValue is not based on a null pointer. If it is, produce 782b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // a diagnostic and mark the designator as invalid. 783b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkNullPointer(EvalInfo &Info, const Expr *E, 784b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CheckSubobjectKind CSK) { 785b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.Invalid) 786b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 787b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 788b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_null_subobject) 789b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << CSK; 790b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.setInvalid(); 791b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 792b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 793b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 794b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 795b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 796b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this LValue refers to an object. If not, set the designator to be 797b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // invalid and emit a diagnostic. 798b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { 799b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return checkNullPointer(Info, E, CSK) && 800b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.checkSubobject(Info, E, CSK); 801b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 802b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 803b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addDecl(EvalInfo &Info, const Expr *E, 804b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const Decl *D, bool Virtual = false) { 805b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base); 806b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(D, Virtual); 807b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 808b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { 809b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith checkSubobject(Info, E, CSK_ArrayToPointer); 810b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addArrayUnchecked(CAT); 811b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 81286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { 81386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real); 81486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Designator.addComplexUnchecked(EltTy, Imag); 81586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 816b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith void adjustIndex(EvalInfo &Info, const Expr *E, uint64_t N) { 817b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!checkNullPointer(Info, E, CSK_ArrayIndex)) 818b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return; 819b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.adjustIndex(Info, E, N); 82056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 821efdb83e26f9a1fd2566afe54461216cd84814d42John McCall }; 822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith struct MemberPtr { 824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr() {} 825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith explicit MemberPtr(const ValueDecl *Decl) : 826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember(Decl, false), Path() {} 827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 828e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// The member or (direct or indirect) field referred to by this member 829e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// pointer, or 0 if this is a null member pointer. 830e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *getDecl() const { 831e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getPointer(); 832e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 833e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Is this actually a member of some type derived from the relevant class? 834e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool isDerivedMember() const { 835e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DeclAndIsDerivedMember.getInt(); 836e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Get the class which the declaration actually lives in. 838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *getContainingRecord() const { 839e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return cast<CXXRecordDecl>( 840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.getPointer()->getDeclContext()); 841e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void moveInto(CCValue &V) const { 844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith V = CCValue(getDecl(), isDerivedMember(), Path); 845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith void setFrom(const CCValue &V) { 847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(V.isMemberPointer()); 848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); 849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); 850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.clear(); 851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); 852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.insert(Path.end(), P.begin(), P.end()); 853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// DeclAndIsDerivedMember - The member declaration, and a flag indicating 856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// whether the member is a member of some class derived from the class type 857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// of the member pointer. 858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; 859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Path - The path of base/derived classes from the member declaration's 860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// class (exclusive) to the class type of the member pointer (inclusive). 861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SmallVector<const CXXRecordDecl*, 4> Path; 862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a cast towards the class of the Decl (either up or down the 864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// hierarchy). 865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castBack(const CXXRecordDecl *Class) { 866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!Path.empty()); 867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Expected; 868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.size() >= 2) 869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = Path[Path.size() - 2]; 870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Expected = getContainingRecord(); 872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { 873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), 874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // if B does not contain the original member and is not a base or 875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived class of the class containing the original member, the result 876e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // of the cast is undefined. 877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to 878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (D::*). We consider that to be a language defect. 879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.pop_back(); 882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a base-to-derived member pointer cast. 885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToDerived(const CXXRecordDecl *Derived) { 886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!isDerivedMember()) { 889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Derived); 890e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 891e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 892e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!castBack(Derived)) 893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 894e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 895e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(false); 896e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 897e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 898e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Perform a derived-to-base member pointer cast. 899e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool castToBase(const CXXRecordDecl *Base) { 900e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!getDecl()) 901e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 902e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Path.empty()) 903e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith DeclAndIsDerivedMember.setInt(true); 904e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isDerivedMember()) { 905e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Path.push_back(Base); 906e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 907e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 908e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return castBack(Base); 909e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 910e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith }; 911c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 912b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith /// Compare two member pointers, which are assumed to be of the same type. 913b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { 914b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHS.getDecl() || !RHS.getDecl()) 915b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return !LHS.getDecl() && !RHS.getDecl(); 916b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) 917b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 918b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return LHS.Path == RHS.Path; 919b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 920b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 921c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith /// Kinds of constant expression checking, for diagnostics. 922c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith enum CheckConstantExpressionKind { 923c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_Constant, ///< A normal constant. 924c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_ReturnValue, ///< A constexpr function return value. 925c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith CCEK_MemberInit ///< A constexpr constructor mem-initializer. 926c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith }; 927f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall} 92887eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner 92947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E); 93083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, 93183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const LValue &This, const Expr *E, 93283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CheckConstantExpressionKind CCEK = CCEK_Constant, 93383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes = false); 934efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info); 935efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info); 936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info); 938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); 93987eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattnerstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); 94047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 941d9becd1846e2c72bf6ad283faa1b048f33dd3afeChris Lattner EvalInfo &Info); 942d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); 943f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallstatic bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); 944f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 945f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 9464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// Misc utilities 9474efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 9484efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 949180f47959a066795cc0f409433023af448bb0328Richard Smith/// Should this call expression be treated as a string literal? 950180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool IsStringLiteralCall(const CallExpr *E) { 951180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Builtin = E->isBuiltinCall(); 952180f47959a066795cc0f409433023af448bb0328Richard Smith return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || 953180f47959a066795cc0f409433023af448bb0328Richard Smith Builtin == Builtin::BI__builtin___NSStringMakeConstantString); 954180f47959a066795cc0f409433023af448bb0328Richard Smith} 955180f47959a066795cc0f409433023af448bb0328Richard Smith 9561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smithstatic bool IsGlobalLValue(APValue::LValueBase B) { 957180f47959a066795cc0f409433023af448bb0328Richard Smith // C++11 [expr.const]p3 An address constant expression is a prvalue core 958180f47959a066795cc0f409433023af448bb0328Richard Smith // constant expression of pointer type that evaluates to... 959180f47959a066795cc0f409433023af448bb0328Richard Smith 960180f47959a066795cc0f409433023af448bb0328Richard Smith // ... a null pointer value, or a prvalue core constant expression of type 961180f47959a066795cc0f409433023af448bb0328Richard Smith // std::nullptr_t. 9621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!B) return true; 96342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 9641bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 965180f47959a066795cc0f409433023af448bb0328Richard Smith // ... the address of an object with static storage duration, 9661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 96742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->hasGlobalStorage(); 9681bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith // ... the address of a function, 9691bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return isa<FunctionDecl>(D); 97042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 9711bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith 9721bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *E = B.get<const Expr*>(); 9731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith switch (E->getStmtClass()) { 9741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith default: 9751bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return false; 976b78ae9716576399145786b93f687943f8b197170Richard Smith case Expr::CompoundLiteralExprClass: { 977b78ae9716576399145786b93f687943f8b197170Richard Smith const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); 978b78ae9716576399145786b93f687943f8b197170Richard Smith return CLE->isFileScope() && CLE->isLValue(); 979b78ae9716576399145786b93f687943f8b197170Richard Smith } 980180f47959a066795cc0f409433023af448bb0328Richard Smith // A string literal has static storage duration. 981180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::StringLiteralClass: 982180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::PredefinedExprClass: 983180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCStringLiteralClass: 984180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::ObjCEncodeExprClass: 98547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith case Expr::CXXTypeidExprClass: 986180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 987180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::CallExprClass: 988180f47959a066795cc0f409433023af448bb0328Richard Smith return IsStringLiteralCall(cast<CallExpr>(E)); 989180f47959a066795cc0f409433023af448bb0328Richard Smith // For GCC compatibility, &&label has static storage duration. 990180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::AddrLabelExprClass: 991180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 992180f47959a066795cc0f409433023af448bb0328Richard Smith // A Block literal expression may be used as the initialization value for 993180f47959a066795cc0f409433023af448bb0328Richard Smith // Block variables at global or local static scope. 994180f47959a066795cc0f409433023af448bb0328Richard Smith case Expr::BlockExprClass: 995180f47959a066795cc0f409433023af448bb0328Richard Smith return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); 996745f5147e065900267c85a5568785a1991d4838fRichard Smith case Expr::ImplicitValueInitExprClass: 997745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: 998745f5147e065900267c85a5568785a1991d4838fRichard Smith // We can never form an lvalue with an implicit value initialization as its 999745f5147e065900267c85a5568785a1991d4838fRichard Smith // base through expression evaluation, so these only appear in one case: the 1000745f5147e065900267c85a5568785a1991d4838fRichard Smith // implicit variable declaration we invent when checking whether a constexpr 1001745f5147e065900267c85a5568785a1991d4838fRichard Smith // constructor can produce a constant expression. We must assume that such 1002745f5147e065900267c85a5568785a1991d4838fRichard Smith // an expression might be a global lvalue. 1003745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 1004180f47959a066795cc0f409433023af448bb0328Richard Smith } 100542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 100642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 100783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { 100883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert(Base && "no location for a null lvalue"); 100983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 101083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (VD) 101183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 101283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith else 101383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Note(Base.dyn_cast<const Expr*>()->getExprLoc(), 101483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith diag::note_constexpr_temporary_here); 101583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith} 101683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 10179a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this reference or pointer core constant expression is a valid 1018b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// value for an address or reference constant expression. Type T should be 101961e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// either LValue or CCValue. Return true if we can fold this expression, 102061e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith/// whether or not it's a constant expression. 102183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, 102283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const LValue &LVal) { 102383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool IsReferenceType = Type->isReferenceType(); 102483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 1025c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APValue::LValueBase Base = LVal.getLValueBase(); 1026c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const SubobjectDesignator &Designator = LVal.getLValueDesignator(); 1027c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1028b78ae9716576399145786b93f687943f8b197170Richard Smith // Check that the object is a global. Note that the fake 'this' object we 1029b78ae9716576399145786b93f687943f8b197170Richard Smith // manufacture when checking potential constant expressions is conservatively 1030b78ae9716576399145786b93f687943f8b197170Richard Smith // assumed to be global here. 1031c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!IsGlobalLValue(Base)) { 1032c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 1033c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 103483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_non_global, 1) 103583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << IsReferenceType << !Designator.Entries.empty() 103683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith << !!VD << VD; 103783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1038c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 103983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc); 1040c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 104161e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith // Don't allow references to temporaries to escape. 104269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return false; 1043f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 104483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith assert((Info.CheckingPotentialConstantExpression || 104583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.getLValueCallIndex() == 0) && 104683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith "have call index for global lvalue"); 1047b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1048b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Allow address constant expressions to be past-the-end pointers. This is 1049b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // an extension: the standard requires them to point to an object. 1050b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!IsReferenceType) 1051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1052b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1053b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A reference constant expression must refer to an object. 1054b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Base) { 1055b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // FIXME: diagnostic 105683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.CCEDiag(Loc); 105761e616206413d1779c7545c7a8ad1ce1129ad9c1Richard Smith return true; 1058b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 1059b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1060c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Does this refer one past the end of some object? 1061b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Designator.isOnePastTheEnd()) { 1062c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); 106383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_past_end, 1) 1064c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << !Designator.Entries.empty() << !!VD << VD; 106583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, Base); 1066c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 1067c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 106869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith return true; 106947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith} 107047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith 107151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Check that this core constant expression is of literal type, and if not, 107251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// produce an appropriate diagnostic. 107351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithstatic bool CheckLiteralType(EvalInfo &Info, const Expr *E) { 107451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!E->isRValue() || E->getType()->isLiteralType()) 107551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 107651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 107751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Prvalue constant expressions must be of literal types. 107851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Info.getLangOpts().CPlusPlus0x) 107951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) 108051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith << E->getType(); 108151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith else 108251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 108351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 108451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 108551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 10869a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith/// Check that this core constant expression value is a valid value for a 108783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// constant expression. If not, report an appropriate diagnostic. Does not 108883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// check that the expression is of literal type. 108983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, 109083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType Type, const APValue &Value) { 109183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Core issue 1454: For a literal constant expression of array or class type, 109283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // each subobject of its value shall have been initialized by a constant 109383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // expression. 109483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isArray()) { 109583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); 109683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { 109783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, EltTy, 109883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayInitializedElt(I))) 109983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 110083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 110183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Value.hasArrayFiller()) 110283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 110383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, EltTy, 110483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getArrayFiller()); 110583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 110683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isUnion() && Value.getUnionField()) { 110783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, DiagLoc, 110883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionField()->getType(), 110983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getUnionValue()); 111083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 111183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isStruct()) { 111283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); 111383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { 111483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith unsigned BaseIndex = 0; 111583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 111683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith End = CD->bases_end(); I != End; ++I, ++BaseIndex) { 111783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, I->getType(), 111883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructBase(BaseIndex))) 111983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 112083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 112383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith I != E; ++I) { 112483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!CheckConstantExpression(Info, DiagLoc, (*I)->getType(), 112583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value.getStructField((*I)->getFieldIndex()))) 112683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 112783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 112983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 113083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (Value.isLValue()) { 113183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Val(Info.Ctx, Value, CCValue::GlobalValue()); 113283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LValue LVal; 113383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LVal.setFrom(Val); 113483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal); 11359a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith } 113683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 113783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith // Everything else is fine. 113883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 11399a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith} 11409a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith 11419e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithconst ValueDecl *GetLValueBaseDecl(const LValue &LVal) { 11421bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return LVal.Base.dyn_cast<const ValueDecl*>(); 11439e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11449e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 11459e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smithstatic bool IsLiteralLValue(const LValue &Value) { 114683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return Value.Base.dyn_cast<const Expr*>() && !Value.CallIndex; 11479e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith} 11489e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith 114965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smithstatic bool IsWeakLValue(const LValue &Value) { 115065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith const ValueDecl *Decl = GetLValueBaseDecl(Value); 11510dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return Decl && Decl->isWeak(); 115265ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith} 115365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1154e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvalPointerValueAsBool(const CCValue &Value, bool &Result) { 11553554283157190e67918fad4221a5e6faf9317362John McCall // A null base expression indicates a null pointer. These are always 11563554283157190e67918fad4221a5e6faf9317362John McCall // evaluatable, and they are false unless the offset is zero. 1157e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Value.getLValueBase()) { 1158e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = !Value.getLValueOffset().isZero(); 11593554283157190e67918fad4221a5e6faf9317362John McCall return true; 11603554283157190e67918fad4221a5e6faf9317362John McCall } 11613554283157190e67918fad4221a5e6faf9317362John McCall 1162e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We have a non-null base. These are generally known to be true, but if it's 1163e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // a weak declaration it can be null at runtime. 11643554283157190e67918fad4221a5e6faf9317362John McCall Result = true; 1165e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); 11660dd7a25e8d679de1dc0ce788222d6dee0e879885Lang Hames return !Decl || !Decl->isWeak(); 11675bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman} 11685bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman 116947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool HandleConversionToBool(const CCValue &Val, bool &Result) { 1170c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (Val.getKind()) { 1171c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Uninitialized: 1172c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1173c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Int: 1174c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getInt().getBoolValue(); 117541bf4f38348561a0f12c10d34f1673cd19a6eb04Richard Smith return true; 1176c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Float: 1177c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getFloat().isZero(); 1178a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman return true; 1179c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexInt: 1180c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = Val.getComplexIntReal().getBoolValue() || 1181c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Val.getComplexIntImag().getBoolValue(); 1182c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 1183c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::ComplexFloat: 1184c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = !Val.getComplexFloatReal().isZero() || 1185c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith !Val.getComplexFloatImag().isZero(); 1186436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith return true; 1187e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::LValue: 1188e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvalPointerValueAsBool(Val, Result); 1189e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case APValue::MemberPointer: 1190e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = Val.getMemberPointerDecl(); 1191e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 1192c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case APValue::Vector: 1193cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith case APValue::Array: 1194180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Struct: 1195180f47959a066795cc0f409433023af448bb0328Richard Smith case APValue::Union: 119665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman case APValue::AddrLabelDiff: 1197c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 11984efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 11994efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1200c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith llvm_unreachable("unknown APValue kind"); 1201c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1202c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1203c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, 1204c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalInfo &Info) { 1205c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition"); 120647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 1207c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!Evaluate(Val, Info, E)) 1208c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1209c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return HandleConversionToBool(Val, Result); 12104efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 12114efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 1212c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithtemplate<typename T> 1213c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleOverflow(EvalInfo &Info, const Expr *E, 1214c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const T &SrcValue, QualType DestType) { 1215c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_overflow) 1216789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << SrcValue << DestType; 1217c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 1218c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 1219c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 1220c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, 1221c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APFloat &Value, 1222c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APSInt &Result) { 1223c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1224a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Determine whether we are converting to unsigned or signed. 1225575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); 12261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1227c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APSInt(DestWidth, !DestSigned); 1228a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1229c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) 1230c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opInvalidOp) 1231c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1232c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1233a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1234a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1235c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, 1236c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, QualType DestType, 1237c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat &Result) { 1238c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat Value = Result; 1239a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar bool ignored; 1240c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), 1241c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven, &ignored) 1242c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1243c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1244c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1245a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1246a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1247f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smithstatic APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, 1248f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith QualType DestType, QualType SrcType, 1249f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith APSInt &Value) { 1250f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith unsigned DestWidth = Info.Ctx.getIntWidth(DestType); 1251a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar APSInt Result = Value; 1252a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // Figure out if this is a truncate, extend or noop cast. 1253a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar // If the input is signed, do a sign extend, noop, or truncate. 12549f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Result = Result.extOrTrunc(DestWidth); 1255575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); 1256a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar return Result; 1257a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1258a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1259c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, 1260c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType SrcType, const APSInt &Value, 1261c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith QualType DestType, APFloat &Result) { 1262c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); 1263c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Result.convertFromAPInt(Value, Value.isSigned(), 1264c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APFloat::rmNearestTiesToEven) 1265c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith & APFloat::opOverflow) 1266c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleOverflow(Info, E, Value, DestType); 1267c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 1268a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar} 1269a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 1270e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedmanstatic bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, 1271e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt &Res) { 1272e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman CCValue SVal; 1273e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!Evaluate(SVal, Info, E)) 1274e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1275e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isInt()) { 1276e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getInt(); 1277e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1278e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1279e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isFloat()) { 1280e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = SVal.getFloat().bitcastToAPInt(); 1281e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1282e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1283e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (SVal.isVector()) { 1284e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType VecTy = E->getType(); 1285e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned VecSize = Info.Ctx.getTypeSize(VecTy); 1286e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); 1287e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 1288e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 1289e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res = llvm::APInt::getNullValue(VecSize); 1290e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < SVal.getVectorLength(); i++) { 1291e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman APValue &Elt = SVal.getVectorElt(i); 1292e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt EltAsInt; 1293e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (Elt.isInt()) { 1294e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getInt(); 1295e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (Elt.isFloat()) { 1296e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman EltAsInt = Elt.getFloat().bitcastToAPInt(); 1297e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 1298e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Don't try to handle vectors of anything other than int or float 1299e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // (not sure if it's possible to hit this case). 1300e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1301e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1302e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1303e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned BaseEltSize = EltAsInt.getBitWidth(); 1304e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 1305e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); 1306e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 1307e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); 1308e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1309e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return true; 1310e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 1311e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Give up if the input isn't an int, float, or vector. For example, we 1312e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // reject "(v4i16)(intptr_t)&a". 1313e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1314e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 1315e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman} 1316e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman 1317b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// Cast an lvalue referring to a base subobject to a derived class, by 1318b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// truncating the lvalue's path to the given length. 1319b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, 1320b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *TruncatedType, 1321b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned TruncatedElements) { 1322b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Result.Designator; 1323180f47959a066795cc0f409433023af448bb0328Richard Smith 1324b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check we actually point to a derived class object. 1325b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (TruncatedElements == D.Entries.size()) 1326b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return true; 1327b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith assert(TruncatedElements >= D.MostDerivedPathLength && 1328b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith "not casting to a derived class"); 1329b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Result.checkSubobject(Info, E, CSK_Derived)) 1330180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1331180f47959a066795cc0f409433023af448bb0328Richard Smith 1332b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Truncate the path to the subobject, and remove any derived-to-base offsets. 1333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const RecordDecl *RD = TruncatedType; 1334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { 1335180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 1336180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); 1337e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isVirtualBaseClass(D.Entries[I])) 1338180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getVBaseClassOffset(Base); 1339e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith else 1340180f47959a066795cc0f409433023af448bb0328Richard Smith Result.Offset -= Layout.getBaseClassOffset(Base); 1341180f47959a066795cc0f409433023af448bb0328Richard Smith RD = Base; 1342180f47959a066795cc0f409433023af448bb0328Richard Smith } 1343e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith D.Entries.resize(TruncatedElements); 1344180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1345180f47959a066795cc0f409433023af448bb0328Richard Smith} 1346180f47959a066795cc0f409433023af448bb0328Richard Smith 1347b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1348180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Derived, 1349180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *Base, 1350180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1351180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived); 1352180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += RL->getBaseClassOffset(Base); 1353b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, Base, /*Virtual*/ false); 1354180f47959a066795cc0f409433023af448bb0328Richard Smith} 1355180f47959a066795cc0f409433023af448bb0328Richard Smith 1356b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, 1357180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *DerivedDecl, 1358180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXBaseSpecifier *Base) { 1359180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); 1360180f47959a066795cc0f409433023af448bb0328Richard Smith 1361180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Base->isVirtual()) { 1362b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); 1363180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1364180f47959a066795cc0f409433023af448bb0328Richard Smith } 1365180f47959a066795cc0f409433023af448bb0328Richard Smith 1366b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator &D = Obj.Designator; 1367b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid) 1368b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1369b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 1370180f47959a066795cc0f409433023af448bb0328Richard Smith // Extract most-derived object and corresponding type. 1371b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); 1372b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) 1373180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1374180f47959a066795cc0f409433023af448bb0328Richard Smith 1375b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Find the virtual base class. 1376180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); 1377180f47959a066795cc0f409433023af448bb0328Richard Smith Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); 1378b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); 1379180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1380180f47959a066795cc0f409433023af448bb0328Richard Smith} 1381180f47959a066795cc0f409433023af448bb0328Richard Smith 1382180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update LVal to refer to the given field, which must be a member of the type 1383180f47959a066795cc0f409433023af448bb0328Richard Smith/// currently described by LVal. 1384b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic void HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, 1385180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD, 1386180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout *RL = 0) { 1387180f47959a066795cc0f409433023af448bb0328Richard Smith if (!RL) 1388180f47959a066795cc0f409433023af448bb0328Richard Smith RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); 1389180f47959a066795cc0f409433023af448bb0328Richard Smith 1390180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned I = FD->getFieldIndex(); 1391180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I)); 1392b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.addDecl(Info, E, FD); 1393180f47959a066795cc0f409433023af448bb0328Richard Smith} 1394180f47959a066795cc0f409433023af448bb0328Richard Smith 1395d9b02e726262e4009dda830998bb934172ac0020Richard Smith/// Update LVal to refer to the given indirect field. 1396d9b02e726262e4009dda830998bb934172ac0020Richard Smithstatic void HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, 1397d9b02e726262e4009dda830998bb934172ac0020Richard Smith LValue &LVal, 1398d9b02e726262e4009dda830998bb934172ac0020Richard Smith const IndirectFieldDecl *IFD) { 1399d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 1400d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); C != CE; ++C) 1401d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, E, LVal, cast<FieldDecl>(*C)); 1402d9b02e726262e4009dda830998bb934172ac0020Richard Smith} 1403d9b02e726262e4009dda830998bb934172ac0020Richard Smith 1404180f47959a066795cc0f409433023af448bb0328Richard Smith/// Get the size of the given type in char units. 140574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smithstatic bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, 140674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith QualType Type, CharUnits &Size) { 1407180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc 1408180f47959a066795cc0f409433023af448bb0328Richard Smith // extension. 1409180f47959a066795cc0f409433023af448bb0328Richard Smith if (Type->isVoidType() || Type->isFunctionType()) { 1410180f47959a066795cc0f409433023af448bb0328Richard Smith Size = CharUnits::One(); 1411180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1412180f47959a066795cc0f409433023af448bb0328Richard Smith } 1413180f47959a066795cc0f409433023af448bb0328Richard Smith 1414180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Type->isConstantSizeType()) { 1415180f47959a066795cc0f409433023af448bb0328Richard Smith // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 141674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: Better diagnostic. 141774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.Diag(Loc); 1418180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1419180f47959a066795cc0f409433023af448bb0328Richard Smith } 1420180f47959a066795cc0f409433023af448bb0328Richard Smith 1421180f47959a066795cc0f409433023af448bb0328Richard Smith Size = Info.Ctx.getTypeSizeInChars(Type); 1422180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1423180f47959a066795cc0f409433023af448bb0328Richard Smith} 1424180f47959a066795cc0f409433023af448bb0328Richard Smith 1425180f47959a066795cc0f409433023af448bb0328Richard Smith/// Update a pointer value to model pointer arithmetic. 1426180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1427b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith/// \param E - The expression being evaluated, for diagnostic purposes. 1428180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The pointer value to be updated. 1429180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param EltTy - The pointee type represented by LVal. 1430180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Adjustment - The adjustment, in objects of type EltTy, to add. 1431b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, 1432b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue &LVal, QualType EltTy, 1433b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith int64_t Adjustment) { 1434180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits SizeOfPointee; 143574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) 1436180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1437180f47959a066795cc0f409433023af448bb0328Richard Smith 1438180f47959a066795cc0f409433023af448bb0328Richard Smith // Compute the new offset in the appropriate width. 1439180f47959a066795cc0f409433023af448bb0328Richard Smith LVal.Offset += Adjustment * SizeOfPointee; 1440b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LVal.adjustIndex(Info, E, Adjustment); 1441180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 1442180f47959a066795cc0f409433023af448bb0328Richard Smith} 1443180f47959a066795cc0f409433023af448bb0328Richard Smith 144486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// Update an lvalue to refer to a component of a complex number. 144586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Info - Information about the ongoing evaluation. 144686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param LVal - The lvalue to be updated. 144786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param EltTy - The complex number's component type. 144886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith/// \param Imag - False for the real component, true for the imaginary. 144986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithstatic bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, 145086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LValue &LVal, QualType EltTy, 145186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool Imag) { 145286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Imag) { 145386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith CharUnits SizeOfComponent; 145486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) 145586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 145686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.Offset += SizeOfComponent; 145786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 145886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith LVal.addComplex(Info, E, EltTy, Imag); 145986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 146086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 146186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 146203f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith/// Try to evaluate the initializer for a variable declaration. 1463f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E, 1464f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const VarDecl *VD, 1465177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith CallStackFrame *Frame, CCValue &Result) { 1466d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // If this is a parameter to an active constexpr function call, perform 1467d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // argument substitution. 1468d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { 1469745f5147e065900267c85a5568785a1991d4838fRichard Smith // Assume arguments of a potential constant expression are unknown 1470745f5147e065900267c85a5568785a1991d4838fRichard Smith // constant expressions. 1471745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression) 1472745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1473f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Frame || !Frame->Arguments) { 1474dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1475177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return false; 1476f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1477177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith Result = Frame->Arguments[PVD->getFunctionScopeIndex()]; 1478177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 1479d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 148003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1481099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Dig out the initializer, and use the declaration which it's attached to. 1482099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const Expr *Init = VD->getAnyInitializer(VD); 1483099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!Init || Init->isValueDependent()) { 1484745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking a potential constant expression, the variable could be 1485745f5147e065900267c85a5568785a1991d4838fRichard Smith // initialized later. 1486745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1487745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1488099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return false; 1489099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } 1490099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 1491180f47959a066795cc0f409433023af448bb0328Richard Smith // If we're currently evaluating the initializer of this declaration, use that 1492180f47959a066795cc0f409433023af448bb0328Richard Smith // in-flight value. 1493180f47959a066795cc0f409433023af448bb0328Richard Smith if (Info.EvaluatingDecl == VD) { 1494b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *Info.EvaluatingDeclValue, 1495b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith CCValue::GlobalValue()); 1496180f47959a066795cc0f409433023af448bb0328Richard Smith return !Result.isUninit(); 1497180f47959a066795cc0f409433023af448bb0328Richard Smith } 1498180f47959a066795cc0f409433023af448bb0328Richard Smith 149965ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // Never evaluate the initializer of a weak variable. We can't be sure that 150065ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith // this is the definition which will be used. 1501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (VD->isWeak()) { 1502dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 150365ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith return false; 1504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 150565ac598c7ba7e36f2ad611f2bb39cc957053be5dRichard Smith 1506099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Check that we can fold the initializer. In C++, we will have already done 1507099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // this in the cases where it matters for conformance. 1508099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 1509099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (!VD->evaluateValue(Notes)) { 1510099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1511099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1512099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1513099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 151447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return false; 1515099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith } else if (!VD->checkInitIsICE()) { 1516099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_var_init_non_constant, 1517099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Notes.size() + 1) << VD; 1518099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 1519099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Info.addNotes(Notes); 1520f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 152103f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1522b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result = CCValue(Info.Ctx, *VD->getEvaluatedValue(), CCValue::GlobalValue()); 152347a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return true; 152403f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 152503f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 1526c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithstatic bool IsConstNonVolatile(QualType T) { 152703f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith Qualifiers Quals = T.getQualifiers(); 152803f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith return Quals.hasConst() && !Quals.hasVolatile(); 152903f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith} 153003f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith 153159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Get the base index of the given base class within an APValue representing 153259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// the given derived class. 153359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic unsigned getBaseIndex(const CXXRecordDecl *Derived, 153459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base) { 153559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Base = Base->getCanonicalDecl(); 153659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith unsigned Index = 0; 153759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), 153859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith E = Derived->bases_end(); I != E; ++I, ++Index) { 153959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) 154059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Index; 154159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 154259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 154359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm_unreachable("base class missing from derived class's bases list"); 154459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 154559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1546f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith/// Extract the value of a character from a string literal. 1547f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smithstatic APSInt ExtractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, 1548f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith uint64_t Index) { 1549f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1550f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith const StringLiteral *S = dyn_cast<StringLiteral>(Lit); 1551f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(S && "unexpected string literal expression kind"); 1552f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1553f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), 1554f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Lit->getType()->getArrayElementTypeNoTypeQual()->isUnsignedIntegerType()); 1555f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (Index < S->getLength()) 1556f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Value = S->getCodeUnit(Index); 1557f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Value; 1558f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith} 1559f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith 1560cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith/// Extract the designated sub-object of an rvalue. 1561f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool ExtractSubobject(EvalInfo &Info, const Expr *E, 1562f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue &Obj, QualType ObjType, 1563cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const SubobjectDesignator &Sub, QualType SubType) { 1564b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.Invalid) 1565b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1566cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1567b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (Sub.isOnePastTheEnd()) { 15687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1569aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1570aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 15717098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 15727098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1573f64699e8db3946e21b5f4a0421cbc58a3e439599Richard Smith if (Sub.Entries.empty()) 1574cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1575745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && Obj.isUninit()) 1576745f5147e065900267c85a5568785a1991d4838fRichard Smith // This object might be initialized later. 1577745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 1578cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1579cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const APValue *O = &Obj; 1580180f47959a066795cc0f409433023af448bb0328Richard Smith // Walk the designator's path to find the subobject. 1581cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) { 1582cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (ObjType->isArrayType()) { 1583180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is an array element. 1584cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); 1585f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith assert(CAT && "vla in literal type?"); 1586cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 1587f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (CAT->getSize().ule(Index)) { 15887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Note, it should not be possible to form a pointer with a valid 15897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // designator which points more than one past the end of the array. 15907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 1591aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_constexpr_read_past_end : 1592aa5d533427d803e52ee42b250ffd6645ef5ccb0fMatt Beaumont-Gay (unsigned)diag::note_invalid_subexpr_in_const_expr); 1593cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1594f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1595f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // An array object is represented as either an Array APValue or as an 1596f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // LValue which refers to a string literal. 1597f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith if (O->isLValue()) { 1598f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(I == N - 1 && "extracting subobject of character?"); 1599f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert(!O->hasLValuePath() || O->getLValuePath().empty()); 1600f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Obj = CCValue(ExtractStringLiteralCharacter( 1601f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith Info, O->getLValueBase().get<const Expr*>(), Index)); 1602f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return true; 1603f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (O->getArrayInitializedElts() > Index) 1604cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayInitializedElt(Index); 1605cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith else 1606cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith O = &O->getArrayFiller(); 1607cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith ObjType = CAT->getElementType(); 160886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else if (ObjType->isAnyComplexType()) { 160986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // Next subobject is a complex number. 161086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith uint64_t Index = Sub.Entries[I].ArrayIndex; 161186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (Index > 1) { 161286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Info.Diag(E->getExprLoc(), Info.getLangOpts().CPlusPlus0x ? 161386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_constexpr_read_past_end : 161486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (unsigned)diag::note_invalid_subexpr_in_const_expr); 161586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 161686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 161786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(I == N - 1 && "extracting subobject of scalar?"); 161886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (O->isComplexInt()) { 161986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Obj = CCValue(Index ? O->getComplexIntImag() 162086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexIntReal()); 162186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } else { 162286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(O->isComplexFloat()); 162386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith Obj = CCValue(Index ? O->getComplexFloatImag() 162486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith : O->getComplexFloatReal()); 162586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith } 162686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 1627180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { 1628b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith if (Field->isMutable()) { 1629b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_mutable, 1) 1630b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith << Field; 1631b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 1632b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith return false; 1633b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith } 1634b4e5e286a5cd156247720b1eb204abaa8e09568dRichard Smith 1635180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a class, struct or union field. 1636180f47959a066795cc0f409433023af448bb0328Richard Smith RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); 1637180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 1638180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *UnionField = O->getUnionField(); 1639180f47959a066795cc0f409433023af448bb0328Richard Smith if (!UnionField || 1640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { 16417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), 16427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith diag::note_constexpr_read_inactive_union_member) 16437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << Field << !UnionField << UnionField; 1644180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1645f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1646180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getUnionValue(); 1647180f47959a066795cc0f409433023af448bb0328Richard Smith } else 1648180f47959a066795cc0f409433023af448bb0328Richard Smith O = &O->getStructField(Field->getFieldIndex()); 1649180f47959a066795cc0f409433023af448bb0328Richard Smith ObjType = Field->getType(); 16507098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 16517098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (ObjType.isVolatileQualified()) { 16527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 16537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Include a description of the path to the volatile subobject. 16547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_ltor_volatile_obj, 1) 16557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith << 2 << Field; 16567098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Field->getLocation(), diag::note_declared_at); 16577098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 16587098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 16597098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 16607098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 16617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 1662cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else { 1663180f47959a066795cc0f409433023af448bb0328Richard Smith // Next subobject is a base class. 166459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); 166559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); 166659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith O = &O->getStructBase(getBaseIndex(Derived, Base)); 166759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ObjType = Info.Ctx.getRecordType(Base); 1668cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1669180f47959a066795cc0f409433023af448bb0328Richard Smith 1670f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (O->isUninit()) { 1671745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckingPotentialConstantExpression) 1672745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_read_uninit); 1673180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 1674f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1675cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 1676cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1677b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Obj = CCValue(Info.Ctx, *O, CCValue::GlobalValue()); 1678cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 1679cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 1680cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 1681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Find the position where two subobject designators diverge, or equivalently 1682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// the length of the common initial subsequence. 1683f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic unsigned FindDesignatorMismatch(QualType ObjType, 1684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B, 1686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool &WasArrayIndex) { 1687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); 1688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith for (/**/; I != N; ++I) { 168986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!ObjType.isNull() && 169086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith (ObjType->isArrayType() || ObjType->isAnyComplexType())) { 1691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is an array element. 1692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].ArrayIndex != B.Entries[I].ArrayIndex) { 1693f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = true; 1694f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1695f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 169686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (ObjType->isAnyComplexType()) 169786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAs<ComplexType>()->getElementType(); 169886024013d4c3728122c58fa07a2a67e6c15837efRichard Smith else 169986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); 1700f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } else { 1701f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries[I].BaseOrMember != B.Entries[I].BaseOrMember) { 1702f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1703f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1704f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1705f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const FieldDecl *FD = getAsField(A.Entries[I])) 1706f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a field. 1707f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = FD->getType(); 1708f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else 1709f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Next subobject is a base class. 1710f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith ObjType = QualType(); 1711f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1712f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 1713f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith WasArrayIndex = false; 1714f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return I; 1715f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1716f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1717f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// Determine whether the given subobject designators refer to elements of the 1718f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith/// same array object. 1719f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smithstatic bool AreElementsOfSameArray(QualType ObjType, 1720f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &A, 1721f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const SubobjectDesignator &B) { 1722f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (A.Entries.size() != B.Entries.size()) 1723f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1724f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1725f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsArray = A.MostDerivedArraySize != 0; 1726f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsArray && A.MostDerivedPathLength != A.Entries.size()) 1727f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // A is a subobject of the array element. 1728f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 1729f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1730f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If A (and B) designates an array element, the last entry will be the array 1731f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // index. That doesn't have to match. Otherwise, we're in the 'implicit array 1732f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // of length 1' case, and the entire path must match. 1733f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 1734f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); 1735f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return CommonLength >= A.Entries.size() - IsArray; 1736f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith} 1737f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 1738180f47959a066795cc0f409433023af448bb0328Richard Smith/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on 1739180f47959a066795cc0f409433023af448bb0328Richard Smith/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions 1740180f47959a066795cc0f409433023af448bb0328Richard Smith/// for looking up the glvalue referred to by an entity of reference type. 1741180f47959a066795cc0f409433023af448bb0328Richard Smith/// 1742180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param Info - Information about the ongoing evaluation. 1743f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// \param Conv - The expression for which we are performing the conversion. 1744f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Used for diagnostics. 17459ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// \param Type - The type we expect this conversion to produce, before 17469ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith/// stripping cv-qualifiers in the case of a non-clas type. 1747180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param LVal - The glvalue on which we are attempting to perform this action. 1748180f47959a066795cc0f409433023af448bb0328Richard Smith/// \param RVal - The produced value will be placed here. 1749f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool HandleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, 1750f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith QualType Type, 1751cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const LValue &LVal, CCValue &RVal) { 17527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // In C, an lvalue-to-rvalue conversion is never a constant expression. 17537098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!Info.getLangOpts().CPlusPlus) 17547098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 17557098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1756b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LVal.Designator.Invalid) 1757b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // A diagnostic will have already been produced. 1758b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 1759b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 17601bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); 17617098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith SourceLocation Loc = Conv->getExprLoc(); 1762c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1763f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LVal.Base) { 1764f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: Indirection through a null pointer deserves a specific diagnostic. 17657098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_invalid_subexpr_in_const_expr); 17667098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 17677098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 17687098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 176983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CallStackFrame *Frame = 0; 177083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (LVal.CallIndex) { 177183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(LVal.CallIndex); 177283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 177383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 177483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, LVal.Base); 177583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 177683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 177783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 177883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 17797098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type 17807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // is not a constant expression (even if the object is non-volatile). We also 17817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // apply this rule to C++98, in order to conform to the expected 'volatile' 17827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // semantics. 17837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Type.isVolatileQualified()) { 17847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) 17857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_type) << Type; 17867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith else 17877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1788c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1789f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1790c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 17911bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { 1792c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++98, const, non-volatile integers initialized with ICEs are ICEs. 1793c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C++11, constexpr, non-volatile variables initialized with constant 1794d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // expressions are constant expressions too. Inside constexpr functions, 1795d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // parameters are constant expressions even if they're non-const. 1796c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, such things can also be folded, although they are not ICEs. 1797c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith const VarDecl *VD = dyn_cast<VarDecl>(D); 1798f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const VarDecl *VDef = VD->getDefinition()) 1799f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith VD = VDef; 1800f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!VD || VD->isInvalidDecl()) { 18017098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18020a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1803f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1804f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 18057098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // DR1313: If the object is volatile-qualified but the glvalue was not, 18067098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // behavior is undefined so the result is not a constant expression. 18071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType VT = VD->getType(); 18087098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VT.isVolatileQualified()) { 18097098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18107098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 1 << VD; 18117098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18127098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18137098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 1814f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18157098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18167098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18177098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 18187098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!isa<ParmVarDecl>(VD)) { 18197098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (VD->isConstexpr()) { 18207098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // OK, we can read this variable. 18217098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isIntegralOrEnumerationType()) { 18227098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (!VT.isConstQualified()) { 18237098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18247098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_const_int, 1) << VD; 18257098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18267098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18277098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18287098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18297098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18307098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18317098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else if (VT->isFloatingType() && VT.isConstQualified()) { 18327098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // We support folding of const floating-point types, in order to make 18337098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // static const data members of such types (supported as an extension) 18347098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // more useful. 18357098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 18367098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18377098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18387098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18397098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.CCEDiag(Loc); 18407098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18417098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18427098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // FIXME: Allow folding of values of any literal type in all languages. 18437098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 18447098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_non_constexpr, 1) << VD; 18457098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(VD->getLocation(), diag::note_declared_at); 18467098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18477098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18487098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18490a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 1850f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 18510a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith } 18527098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1853f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, Conv, VD, Frame, RVal)) 1854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 1855c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 185647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue()) 1857f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, VT, LVal.Designator, Type); 1858c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1859c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The declaration was initialized by an lvalue, with no lvalue-to-rvalue 1860c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // conversion. This happens when the declaration and the lvalue should be 1861c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // considered synonymous, for instance when initializing an array of char 1862c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // from a string literal. Continue as if the initializer lvalue was the 1863c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // value we were originally given. 18640a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith assert(RVal.getLValueOffset().isZero() && 18650a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith "offset for lvalue init of non-reference"); 18661bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Base = RVal.getLValueBase().get<const Expr*>(); 186783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 186883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (unsigned CallIndex = RVal.getLValueCallIndex()) { 186983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = Info.getCallFrame(CallIndex); 187083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Frame) { 187183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info.Diag(Loc, diag::note_constexpr_lifetime_ended, 1) << !Base; 187283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith NoteLValueLocation(Info, RVal.getLValueBase()); 187383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 187483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 187583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 187683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Frame = 0; 187783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 1878c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 1879c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 18807098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith // Volatile temporary objects cannot be read in constant expressions. 18817098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Base->getType().isVolatileQualified()) { 18827098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith if (Info.getLangOpts().CPlusPlus) { 18837098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc, diag::note_constexpr_ltor_volatile_obj, 1) << 0; 18847098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Note(Base->getExprLoc(), diag::note_constexpr_temporary_here); 18857098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } else { 18867098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith Info.Diag(Loc); 18877098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18887098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith return false; 18897098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith } 18907098cbd601ad915aed22d4b5850da99359f25bf3Richard Smith 1891177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (Frame) { 1892cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // If this is a temporary expression with a nontrivial initializer, grab the 1893cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // value from the relevant stack frame. 1894177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith RVal = Frame->Temporaries[Base]; 1895cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } else if (const CompoundLiteralExpr *CLE 1896cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith = dyn_cast<CompoundLiteralExpr>(Base)) { 1897cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the 1898cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // initializer until now for such expressions. Such an expression can't be 1899cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith // an ICE in C, so this only matters for fold. 1900c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 1901cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!Evaluate(RVal, Info, CLE->getInitializer())) 1902cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1903f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith } else if (isa<StringLiteral>(Base)) { 1904f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // We represent a string literal array as an lvalue pointing at the 1905f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // corresponding expression, rather than building an array of chars. 1906f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith // FIXME: Support PredefinedExpr, ObjCEncodeExpr, MakeStringConstant 1907f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith RVal = CCValue(Info.Ctx, 1908f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith APValue(Base, CharUnits::Zero(), APValue::NoLValuePath(), 0), 1909f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith CCValue::GlobalValue()); 1910f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 1911dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(Conv->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 1912cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 1913f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 1914c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 1915f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, Conv, RVal, Base->getType(), LVal.Designator, 1916f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Type); 1917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 1918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 191959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith/// Build an lvalue for the object argument of a member function call. 192059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithstatic bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, 192159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue &This) { 192259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->getType()->isPointerType()) 192359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluatePointer(Object, This, Info); 192459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 192559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (Object->isGLValue()) 192659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return EvaluateLValue(Object, This, Info); 192759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 1928e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (Object->getType()->isLiteralType()) 1929e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(Object, This, Info); 1930e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1931e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 1932e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 1933e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1934e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleMemberPointerAccess - Evaluate a member access operation and build an 1935e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// lvalue referring to the result. 1936e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// 1937e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param Info - Information about the ongoing evaluation. 1938e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param BO - The member pointer access operation. 1939e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param LV - Filled in with a reference to the resulting object. 1940e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \param IncludeMember - Specifies whether the member itself is included in 1941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the resulting LValue subobject designator. This is not possible when 1942e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// creating a bound member function. 1943e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// \return The field or method declaration to which the member pointer refers, 1944e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// or 0 if evaluation fails. 1945e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, 1946e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const BinaryOperator *BO, 1947e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &LV, 1948e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool IncludeMember = true) { 1949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI); 1950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1951745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalObjOK = EvaluateObjectArgument(Info, BO->getLHS(), LV); 1952745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK && !Info.keepEvaluatingAfterFailure()) 1953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1954e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1955e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr MemPtr; 1956e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(BO->getRHS(), MemPtr, Info)) 1957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to 1960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member value, the behavior is undefined. 1961e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!MemPtr.getDecl()) 1962e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1963e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1964745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalObjOK) 1965745f5147e065900267c85a5568785a1991d4838fRichard Smith return 0; 1966745f5147e065900267c85a5568785a1991d4838fRichard Smith 1967e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (MemPtr.isDerivedMember()) { 1968e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // This is a member of some derived class. Truncate LV appropriately. 1969e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The end of the derived-to-base path for the base object must match the 1970e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // derived-to-base path for the member pointer. 1971b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > 1972e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size()) 1973e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1974e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith unsigned PathLengthToMember = 1975e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.size() - MemPtr.Path.size(); 1976e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { 1977e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *LVDecl = getAsBaseClass( 1978e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries[PathLengthToMember + I]); 1979e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *MPDecl = MemPtr.Path[I]; 1980e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) 1981e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return 0; 1982e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 1983e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 1985b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!CastToDerivedClass(Info, BO, LV, MemPtr.getContainingRecord(), 1986b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith PathLengthToMember)) 1987b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return 0; 1988e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (!MemPtr.Path.empty()) { 1989e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Extend the LValue path with the member pointer's path. 1990e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LV.Designator.Entries.reserve(LV.Designator.Entries.size() + 1991e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemPtr.Path.size() + IncludeMember); 1992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 1993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Walk down to the appropriate base class. 1994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType LVType = BO->getLHS()->getType(); 1995e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = LVType->getAs<PointerType>()) 1996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LVType = PT->getPointeeType(); 1997e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); 1998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(RD && "member pointer access on non-class-type expression"); 1999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // The first class in the path is that of the lvalue. 2000e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { 2001e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; 2002b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, Base); 2003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RD = Base; 2004e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Finally cast to the class containing the member. 2006b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, BO, LV, RD, MemPtr.getContainingRecord()); 2007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Add the member. Note that we cannot build bound member functions here. 2010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (IncludeMember) { 2011d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) 2012d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(Info, BO, LV, FD); 2013d9b02e726262e4009dda830998bb934172ac0020Richard Smith else if (const IndirectFieldDecl *IFD = 2014d9b02e726262e4009dda830998bb934172ac0020Richard Smith dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) 2015d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(Info, BO, LV, IFD); 2016d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2017d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("can't construct reference to bound member function"); 2018e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2019e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2020e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemPtr.getDecl(); 2021e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2022e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2023e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on 2024e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// the provided lvalue, which currently refers to the base object. 2025e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, 2026e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result) { 2027e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith SubobjectDesignator &D = Result.Designator; 2028b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) 2029e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2030e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2031e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType TargetQT = E->getType(); 2032e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const PointerType *PT = TargetQT->getAs<PointerType>()) 2033e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TargetQT = PT->getPointeeType(); 2034b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2035b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check this cast lands within the final derived-to-base subobject path. 2036b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { 2037b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 2038b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2039b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return false; 2040b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2041b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith 2042b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // Check the type of the final cast. We don't need to check the path, 2043b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith // since a cast can only be formed if the path is unique. 2044b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith unsigned NewEntriesSize = D.Entries.size() - E->path_size(); 2045e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); 2046e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *FinalType; 2047b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (NewEntriesSize == D.MostDerivedPathLength) 2048b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith FinalType = D.MostDerivedType->getAsCXXRecordDecl(); 2049b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 2050e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); 2051b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { 2052b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_downcast) 2053b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith << D.MostDerivedType << TargetQT; 2054e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2055b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith } 2056e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2057e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Truncate the lvalue to the appropriate derived class. 2058b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); 205959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 206059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2061c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumpnamespace { 2062d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithenum EvalStmtResult { 2063d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation failed. 2064d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Failed, 2065d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Hit a 'return' statement. 2066d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Returned, 2067d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith /// Evaluation succeeded. 2068d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith ESR_Succeeded 2069d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith}; 2070d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2071d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2072d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith// Evaluate a statement. 207383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic EvalStmtResult EvaluateStmt(CCValue &Result, EvalInfo &Info, 2074d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const Stmt *S) { 2075d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith switch (S->getStmtClass()) { 2076d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith default: 2077d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Failed; 2078d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2079d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::NullStmtClass: 2080d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::DeclStmtClass: 2081d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2082d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2083c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith case Stmt::ReturnStmtClass: { 2084c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); 208583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(Result, Info, RetExpr)) 2086c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Failed; 2087c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return ESR_Returned; 2088c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2089d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2090d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith case Stmt::CompoundStmtClass: { 2091d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith const CompoundStmt *CS = cast<CompoundStmt>(S); 2092d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith for (CompoundStmt::const_body_iterator BI = CS->body_begin(), 2093d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith BE = CS->body_end(); BI != BE; ++BI) { 2094d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); 2095d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (ESR != ESR_Succeeded) 2096d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR; 2097d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2098d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return ESR_Succeeded; 2099d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2100d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2101d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2102d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 21036180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial 21046180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// default constructor. If so, we'll fold it whether or not it's marked as 21056180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// constexpr. If it is marked as constexpr, we will never implicitly define it, 21066180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith/// so we need special handling. 21076180245e9f63d2927b185ec251fb75aba30f1cacRichard Smithstatic bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, 210851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXConstructorDecl *CD, 210951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool IsValueInitialization) { 21106180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (!CD->isTrivial() || !CD->isDefaultConstructor()) 21116180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return false; 21126180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 21134c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // Value-initialization does not call a trivial default constructor, so such a 21144c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // call is a core constant expression whether or not the constructor is 21154c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // constexpr. 21164c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!CD->isConstexpr() && !IsValueInitialization) { 21176180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (Info.getLangOpts().CPlusPlus0x) { 21184c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, 21194c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // we should be much more explicit about why it's not constexpr. 21204c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) 21214c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; 21224c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Info.Note(CD->getLocation(), diag::note_declared_at); 21236180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } else { 21246180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); 21256180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21266180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 21276180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 21286180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith} 21296180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 2130c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// CheckConstexprFunction - Check that a function can be called in a constant 2131c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith/// expression. 2132c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smithstatic bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, 2133c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Declaration, 2134c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition) { 2135745f5147e065900267c85a5568785a1991d4838fRichard Smith // Potential constant expressions can contain calls to declared, but not yet 2136745f5147e065900267c85a5568785a1991d4838fRichard Smith // defined, constexpr functions. 2137745f5147e065900267c85a5568785a1991d4838fRichard Smith if (Info.CheckingPotentialConstantExpression && !Definition && 2138745f5147e065900267c85a5568785a1991d4838fRichard Smith Declaration->isConstexpr()) 2139745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2140745f5147e065900267c85a5568785a1991d4838fRichard Smith 2141c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith // Can we evaluate this function call? 2142c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Definition && Definition->isConstexpr() && !Definition->isInvalidDecl()) 2143c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return true; 2144c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2145c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) { 2146c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; 2147099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // FIXME: If DiagDecl is an implicitly-declared special member function, we 2148099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // should be much more explicit about why it's not constexpr. 2149c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_constexpr_invalid_function, 1) 2150c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl->isConstexpr() << isa<CXXConstructorDecl>(DiagDecl) 2151c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << DiagDecl; 2152c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Note(DiagDecl->getLocation(), diag::note_declared_at); 2153c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else { 2154c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(CallLoc, diag::note_invalid_subexpr_in_const_expr); 2155c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } 2156c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2157c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith} 2158c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith 2159180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 2160cd99b072e8b32075da6233cbf14ea58a5c82de4fRichard Smithtypedef SmallVector<CCValue, 8> ArgVector; 2161180f47959a066795cc0f409433023af448bb0328Richard Smith} 2162180f47959a066795cc0f409433023af448bb0328Richard Smith 2163180f47959a066795cc0f409433023af448bb0328Richard Smith/// EvaluateArgs - Evaluate the arguments to a function call. 2164180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues, 2165180f47959a066795cc0f409433023af448bb0328Richard Smith EvalInfo &Info) { 2166745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2167180f47959a066795cc0f409433023af448bb0328Richard Smith for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); 2168745f5147e065900267c85a5568785a1991d4838fRichard Smith I != E; ++I) { 2169745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { 2170745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2171745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2172745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2173745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2174745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2175745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2176745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2177745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2178180f47959a066795cc0f409433023af448bb0328Richard Smith} 2179180f47959a066795cc0f409433023af448bb0328Richard Smith 2180d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith/// Evaluate a function call. 2181745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleFunctionCall(SourceLocation CallLoc, 2182745f5147e065900267c85a5568785a1991d4838fRichard Smith const FunctionDecl *Callee, const LValue *This, 2183f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ArrayRef<const Expr*> Args, const Stmt *Body, 218483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EvalInfo &Info, CCValue &Result) { 2185180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2186180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2187180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2188d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2189745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2190745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2191745f5147e065900267c85a5568785a1991d4838fRichard Smith 2192745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); 2193d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith return EvaluateStmt(Result, Info, Body) == ESR_Returned; 2194d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith} 2195d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2196180f47959a066795cc0f409433023af448bb0328Richard Smith/// Evaluate a constructor call. 2197745f5147e065900267c85a5568785a1991d4838fRichard Smithstatic bool HandleConstructorCall(SourceLocation CallLoc, const LValue &This, 219859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith ArrayRef<const Expr*> Args, 2199180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *Definition, 220051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith EvalInfo &Info, APValue &Result) { 2201180f47959a066795cc0f409433023af448bb0328Richard Smith ArgVector ArgValues(Args.size()); 2202180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArgs(Args, ArgValues, Info)) 2203180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2204180f47959a066795cc0f409433023af448bb0328Richard Smith 2205745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.CheckCallLimit(CallLoc)) 2206745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2207745f5147e065900267c85a5568785a1991d4838fRichard Smith 220886c3ae46250cdcc57778c27826060779a92f3815Richard Smith const CXXRecordDecl *RD = Definition->getParent(); 220986c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (RD->getNumVBases()) { 221086c3ae46250cdcc57778c27826060779a92f3815Richard Smith Info.Diag(CallLoc, diag::note_constexpr_virtual_base) << RD; 221186c3ae46250cdcc57778c27826060779a92f3815Richard Smith return false; 221286c3ae46250cdcc57778c27826060779a92f3815Richard Smith } 221386c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2214745f5147e065900267c85a5568785a1991d4838fRichard Smith CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues.data()); 2215180f47959a066795cc0f409433023af448bb0328Richard Smith 2216180f47959a066795cc0f409433023af448bb0328Richard Smith // If it's a delegating constructor, just delegate. 2217180f47959a066795cc0f409433023af448bb0328Richard Smith if (Definition->isDelegatingConstructor()) { 2218180f47959a066795cc0f409433023af448bb0328Richard Smith CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); 221983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result, Info, This, (*I)->getInit()); 2220180f47959a066795cc0f409433023af448bb0328Richard Smith } 2221180f47959a066795cc0f409433023af448bb0328Richard Smith 2222610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // For a trivial copy or move constructor, perform an APValue copy. This is 2223610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // essential for unions, where the operations performed by the constructor 2224610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // cannot be represented by ctor-initializers. 2225610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith if (Definition->isDefaulted() && 2226610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith ((Definition->isCopyConstructor() && RD->hasTrivialCopyConstructor()) || 2227610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith (Definition->isMoveConstructor() && RD->hasTrivialMoveConstructor()))) { 2228610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith LValue RHS; 2229610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith RHS.setFrom(ArgValues[0]); 2230610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith CCValue Value; 2231745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!HandleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), 2232745f5147e065900267c85a5568785a1991d4838fRichard Smith RHS, Value)) 2233745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2234745f5147e065900267c85a5568785a1991d4838fRichard Smith assert((Value.isStruct() || Value.isUnion()) && 2235745f5147e065900267c85a5568785a1991d4838fRichard Smith "trivial copy/move from non-class type?"); 2236745f5147e065900267c85a5568785a1991d4838fRichard Smith // Any CCValue of class type must already be a constant expression. 2237745f5147e065900267c85a5568785a1991d4838fRichard Smith Result = Value; 2238745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 2239610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith } 2240610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith 2241610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Reserve space for the struct members. 224251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!RD->isUnion() && Result.isUninit()) 2243180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 2244180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 2245180f47959a066795cc0f409433023af448bb0328Richard Smith 2246180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 2247180f47959a066795cc0f409433023af448bb0328Richard Smith 2248745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 2249180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned BasesSeen = 0; 2250180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2251180f47959a066795cc0f409433023af448bb0328Richard Smith CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); 2252180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2253180f47959a066795cc0f409433023af448bb0328Richard Smith for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(), 2254180f47959a066795cc0f409433023af448bb0328Richard Smith E = Definition->init_end(); I != E; ++I) { 2255745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue Subobject = This; 2256745f5147e065900267c85a5568785a1991d4838fRichard Smith APValue *Value = &Result; 2257745f5147e065900267c85a5568785a1991d4838fRichard Smith 2258745f5147e065900267c85a5568785a1991d4838fRichard Smith // Determine the subobject to initialize. 2259180f47959a066795cc0f409433023af448bb0328Richard Smith if ((*I)->isBaseInitializer()) { 2260180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseType((*I)->getBaseClass(), 0); 2261180f47959a066795cc0f409433023af448bb0328Richard Smith#ifndef NDEBUG 2262180f47959a066795cc0f409433023af448bb0328Richard Smith // Non-virtual base classes are initialized in the order in the class 226386c3ae46250cdcc57778c27826060779a92f3815Richard Smith // definition. We have already checked for virtual base classes. 2264180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!BaseIt->isVirtual() && "virtual base for literal type"); 2265180f47959a066795cc0f409433023af448bb0328Richard Smith assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && 2266180f47959a066795cc0f409433023af448bb0328Richard Smith "base class initializers not in expected order"); 2267180f47959a066795cc0f409433023af448bb0328Richard Smith ++BaseIt; 2268180f47959a066795cc0f409433023af448bb0328Richard Smith#endif 2269b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, (*I)->getInit(), Subobject, RD, 2270180f47959a066795cc0f409433023af448bb0328Richard Smith BaseType->getAsCXXRecordDecl(), &Layout); 2271745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructBase(BasesSeen++); 2272180f47959a066795cc0f409433023af448bb0328Richard Smith } else if (FieldDecl *FD = (*I)->getMember()) { 2273b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD, &Layout); 2274180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 2275180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(FD); 2276745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getUnionValue(); 2277745f5147e065900267c85a5568785a1991d4838fRichard Smith } else { 2278745f5147e065900267c85a5568785a1991d4838fRichard Smith Value = &Result.getStructField(FD->getFieldIndex()); 2279745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2280d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (IndirectFieldDecl *IFD = (*I)->getIndirectMember()) { 2281d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Walk the indirect field decl's chain to find the object to initialize, 2282d9b02e726262e4009dda830998bb934172ac0020Richard Smith // and make sure we've initialized every step along it. 2283d9b02e726262e4009dda830998bb934172ac0020Richard Smith for (IndirectFieldDecl::chain_iterator C = IFD->chain_begin(), 2284d9b02e726262e4009dda830998bb934172ac0020Richard Smith CE = IFD->chain_end(); 2285d9b02e726262e4009dda830998bb934172ac0020Richard Smith C != CE; ++C) { 2286d9b02e726262e4009dda830998bb934172ac0020Richard Smith FieldDecl *FD = cast<FieldDecl>(*C); 2287d9b02e726262e4009dda830998bb934172ac0020Richard Smith CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); 2288d9b02e726262e4009dda830998bb934172ac0020Richard Smith // Switch the union field if it differs. This happens if we had 2289d9b02e726262e4009dda830998bb934172ac0020Richard Smith // preceding zero-initialization, and we're now initializing a union 2290d9b02e726262e4009dda830998bb934172ac0020Richard Smith // subobject other than the first. 2291d9b02e726262e4009dda830998bb934172ac0020Richard Smith // FIXME: In this case, the values of the other subobjects are 2292d9b02e726262e4009dda830998bb934172ac0020Richard Smith // specified, since zero-initialization sets all padding bits to zero. 2293d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (Value->isUninit() || 2294d9b02e726262e4009dda830998bb934172ac0020Richard Smith (Value->isUnion() && Value->getUnionField() != FD)) { 2295d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2296d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(FD); 2297d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2298d9b02e726262e4009dda830998bb934172ac0020Richard Smith *Value = APValue(APValue::UninitStruct(), CD->getNumBases(), 2299d9b02e726262e4009dda830998bb934172ac0020Richard Smith std::distance(CD->field_begin(), CD->field_end())); 2300d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2301745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, (*I)->getInit(), Subobject, FD); 2302d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (CD->isUnion()) 2303d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getUnionValue(); 2304d9b02e726262e4009dda830998bb934172ac0020Richard Smith else 2305d9b02e726262e4009dda830998bb934172ac0020Richard Smith Value = &Value->getStructField(FD->getFieldIndex()); 2306d9b02e726262e4009dda830998bb934172ac0020Richard Smith } 2307180f47959a066795cc0f409433023af448bb0328Richard Smith } else { 2308d9b02e726262e4009dda830998bb934172ac0020Richard Smith llvm_unreachable("unknown base initializer kind"); 2309180f47959a066795cc0f409433023af448bb0328Richard Smith } 2310745f5147e065900267c85a5568785a1991d4838fRichard Smith 231183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(*Value, Info, Subobject, (*I)->getInit(), 231283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith (*I)->isBaseInitializer() 2313745f5147e065900267c85a5568785a1991d4838fRichard Smith ? CCEK_Constant : CCEK_MemberInit)) { 2314745f5147e065900267c85a5568785a1991d4838fRichard Smith // If we're checking for a potential constant expression, evaluate all 2315745f5147e065900267c85a5568785a1991d4838fRichard Smith // initializers even if some of them fail. 2316745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 2317745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 2318745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 2319745f5147e065900267c85a5568785a1991d4838fRichard Smith } 2320180f47959a066795cc0f409433023af448bb0328Richard Smith } 2321180f47959a066795cc0f409433023af448bb0328Richard Smith 2322745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 2323180f47959a066795cc0f409433023af448bb0328Richard Smith} 2324180f47959a066795cc0f409433023af448bb0328Richard Smith 2325d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smithnamespace { 2326770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass HasSideEffect 23278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<HasSideEffect, bool> { 23281e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith const ASTContext &Ctx; 2329c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stumppublic: 2330c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23311e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith HasSideEffect(const ASTContext &C) : Ctx(C) {} 2332c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 2333c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // Unhandled nodes conservatively default to having side effects. 23348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStmt(const Stmt *S) { 2335c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2336c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2337c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 23388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitParenExpr(const ParenExpr *E) { return Visit(E->getSubExpr()); } 23398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) { 2340f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return Visit(E->getResultExpr()); 2341f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 23428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E) { 23431e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2344c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2345c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return false; 2346c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 2347f85e193739c953358c865005855253af4f68a497John McCall bool VisitObjCIvarRefExpr(const ObjCIvarRefExpr *E) { 23481e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2349f85e193739c953358c865005855253af4f68a497John McCall return true; 2350f85e193739c953358c865005855253af4f68a497John McCall return false; 2351f85e193739c953358c865005855253af4f68a497John McCall } 2352f85e193739c953358c865005855253af4f68a497John McCall bool VisitBlockDeclRefExpr (const BlockDeclRefExpr *E) { 23531e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2354f85e193739c953358c865005855253af4f68a497John McCall return true; 2355f85e193739c953358c865005855253af4f68a497John McCall return false; 2356f85e193739c953358c865005855253af4f68a497John McCall } 2357f85e193739c953358c865005855253af4f68a497John McCall 2358c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // We don't want to evaluate BlockExprs multiple times, as they generate 2359c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump // a ton of code. 23608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { return true; } 23618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return false; } 23628cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) 2363c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump { return Visit(E->getInitializer()); } 23648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E) { return Visit(E->getBase()); } 23658cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitIntegerLiteral(const IntegerLiteral *E) { return false; } 23668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitFloatingLiteral(const FloatingLiteral *E) { return false; } 23678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return false; } 23688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCharacterLiteral(const CharacterLiteral *E) { return false; } 23698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) 2370f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne { return false; } 23718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E) 2372980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitChooseExpr(const ChooseExpr *E) 23741e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith { return Visit(E->getChosenSubExpr(Ctx)); } 23758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { return Visit(E->getSubExpr()); } 23768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinAssign(const BinaryOperator *E) { return true; } 23778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundAssignOperator(const BinaryOperator *E) { return true; } 23788cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBinaryOperator(const BinaryOperator *E) 2379980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump { return Visit(E->getLHS()) || Visit(E->getRHS()); } 23808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreInc(const UnaryOperator *E) { return true; } 23818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostInc(const UnaryOperator *E) { return true; } 23828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPreDec(const UnaryOperator *E) { return true; } 23838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryPostDec(const UnaryOperator *E) { return true; } 23848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E) { 23851e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (Ctx.getCanonicalType(E->getType()).isVolatileQualified()) 2386c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump return true; 2387980ca220848d27ef55ef4c2d37423461a8ed0da3Mike Stump return Visit(E->getSubExpr()); 2388c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump } 23898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryOperator(const UnaryOperator *E) { return Visit(E->getSubExpr()); } 2390363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner 2391363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner // Has side effects if any element does. 23928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitInitListExpr(const InitListExpr *E) { 2393363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner for (unsigned i = 0, e = E->getNumInits(); i != e; ++i) 2394363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner if (Visit(E->getInit(i))) return true; 23958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const Expr *filler = E->getArrayFiller()) 23964423ac0282acb8ba801eb05b38712438dc0c1e3eArgyrios Kyrtzidis return Visit(filler); 2397363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner return false; 2398363ff23cfddb51abe4ee4212a6dd3c9b534fcc8bChris Lattner } 2399ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 24008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitSizeOfPackExpr(const SizeOfPackExpr *) { return false; } 2401c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump}; 2402c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 240356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallclass OpaqueValueEvaluation { 240456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EvalInfo &info; 240556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueExpr *opaqueValue; 240656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 240756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallpublic: 240856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall OpaqueValueEvaluation(EvalInfo &info, OpaqueValueExpr *opaqueValue, 240956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Expr *value) 241056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall : info(info), opaqueValue(opaqueValue) { 241156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 241256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // If evaluation fails, fail immediately. 24131e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!Evaluate(info.OpaqueValues[opaqueValue], info, value)) { 241456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall this->opaqueValue = 0; 241556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return; 241656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 241756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 241856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 241956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall bool hasError() const { return opaqueValue == 0; } 242056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 242156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ~OpaqueValueEvaluation() { 242274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // FIXME: For a recursive constexpr call, an outer stack frame might have 242374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // been using this opaque value too, and will now have to re-evaluate the 242474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // source expression. 242556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (opaqueValue) info.OpaqueValues.erase(opaqueValue); 242656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 242756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall}; 242856ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 2429c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump} // end anonymous namespace 2430c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 24314efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 24328cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne// Generic Evaluation 24338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 24348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournenamespace { 24358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2436f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith// FIXME: RetTy is always bool. Remove it. 2437f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithtemplate <class Derived, typename RetTy=bool> 24388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneclass ExprEvaluatorBase 24398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ConstStmtVisitor<Derived, RetTy> { 24408cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprivate: 244147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RetTy DerivedSuccess(const CCValue &V, const Expr *E) { 24428cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return static_cast<Derived*>(this)->Success(V, E); 24438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 244451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy DerivedZeroInitialization(const Expr *E) { 244551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return static_cast<Derived*>(this)->ZeroInitialization(E); 2446f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 24478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 244874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Check whether a conditional operator with a non-constant condition is a 244974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // potential constant expression. If neither arm is a potential constant 245074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // expression, then the conditional operator is not either. 245174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 245274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith void CheckPotentialConstantConditional(const ConditionalOperator *E) { 245374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith assert(Info.CheckingPotentialConstantExpression); 245474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 245574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Speculatively evaluate both arms. 245674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith { 245774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diag; 245874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculate(Info, &Diag); 245974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 246074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getFalseExpr()); 246174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 246274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 246374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 246474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Diag.clear(); 246574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith StmtVisitorTy::Visit(E->getTrueExpr()); 246674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Diag.empty()) 246774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return; 246874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 246974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Error(E, diag::note_constexpr_conditional_never_const); 247174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 247274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 247474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith template<typename ConditionalOperator> 247574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool HandleConditionalOperator(const ConditionalOperator *E) { 247674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith bool BoolResult; 247774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { 247874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (Info.CheckingPotentialConstantExpression) 247974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith CheckPotentialConstantConditional(E); 248074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return false; 248174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 248274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 248374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); 248474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return StmtVisitorTy::Visit(EvalExpr); 248574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith } 248674e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 24878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourneprotected: 24888cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne EvalInfo &Info; 24898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ConstStmtVisitor<Derived, RetTy> StmtVisitorTy; 24908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne typedef ExprEvaluatorBase ExprEvaluatorBaseTy; 24918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2492dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { 2493d5093420308784e31071c8cd723a58d74159f393Richard Smith return Info.CCEDiag(E->getExprLoc(), D); 2494f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2495f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// Report an evaluation error. This should only be called when an error is 2497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith /// first discovered. When propagating an error, just return false. 2498f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E, diag::kind D) { 2499dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), D); 2500f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2501f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2502f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool Error(const Expr *E) { 2503f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_invalid_subexpr_in_const_expr); 2504f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 2505f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 250651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RetTy ZeroInitialization(const Expr *E) { return Error(E); } 2507f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 25088cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournepublic: 25098cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} 25108cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25118cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitStmt(const Stmt *) { 2512b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Expression evaluator should not be called on stmts"); 25138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25148cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitExpr(const Expr *E) { 2515f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 25168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25188cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitParenExpr(const ParenExpr *E) 25198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryExtension(const UnaryOperator *E) 25218cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitUnaryPlus(const UnaryOperator *E) 25238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getSubExpr()); } 25248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitChooseExpr(const ChooseExpr *E) 25258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getChosenSubExpr(Info.Ctx)); } 25268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitGenericSelectionExpr(const GenericSelectionExpr *E) 25278cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne { return StmtVisitorTy::Visit(E->getResultExpr()); } 252891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall RetTy VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) 252991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall { return StmtVisitorTy::Visit(E->getReplacement()); } 25303d75ca836205856077c18e30e9447accbd85f751Richard Smith RetTy VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) 25313d75ca836205856077c18e30e9447accbd85f751Richard Smith { return StmtVisitorTy::Visit(E->getExpr()); } 2532bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // We cannot create any objects for which cleanups are required, so there is 2533bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith // nothing to do here; all cleanups must come from unevaluated subexpressions. 2534bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith RetTy VisitExprWithCleanups(const ExprWithCleanups *E) 2535bc6abe93a5d6b1305411f8b6f54c2caa686ddc69Richard Smith { return StmtVisitorTy::Visit(E->getSubExpr()); } 25368cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 2537c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { 2538c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; 2539c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2540c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2541c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith RetTy VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { 2542c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; 2543c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith return static_cast<Derived*>(this)->VisitCastExpr(E); 2544c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith } 2545c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 2546e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitBinaryOperator(const BinaryOperator *E) { 2547e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2548e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2549f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2550e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2551e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_Comma: 2552e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith VisitIgnoredValue(E->getLHS()); 2553e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return StmtVisitorTy::Visit(E->getRHS()); 2554e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2555e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2556e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: { 2557e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Obj; 2558e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!HandleMemberPointerAccess(Info, E, Obj)) 2559e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2560e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue Result; 2561f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) 2562e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2563e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return DerivedSuccess(Result, E); 2564e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2565e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2566e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2567e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 25688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { 256974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Cache the value of the common expression. 25708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne OpaqueValueEvaluation opaque(Info, E->getOpaqueValue(), E->getCommon()); 25718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (opaque.hasError()) 2572f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 25738cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 257474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith return HandleConditionalOperator(E); 25758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 25768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 25778cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitConditionalOperator(const ConditionalOperator *E) { 2578f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool IsBcpCall = false; 2579f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // If the condition (ignoring parens) is a __builtin_constant_p call, 2580f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // the result is a constant expression if it can be folded without 2581f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // side-effects. This is an important GNU extension. See GCC PR38377 2582f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // for discussion. 2583f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (const CallExpr *CallCE = 2584f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) 2585f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 2586f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith IsBcpCall = true; 2587f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2588f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Always assume __builtin_constant_p(...) ? ... : ... is a potential 2589f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression; we can't check whether it's potentially foldable. 2590f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (Info.CheckingPotentialConstantExpression && IsBcpCall) 2591f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2592f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2593f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FoldConstant Fold(Info); 2594f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 259574e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleConditionalOperator(E)) 2596f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return false; 2597f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2598f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (IsBcpCall) 2599f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Fold.Fold(Info); 2600f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 2601f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith return true; 26028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 26038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 26048cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne RetTy VisitOpaqueValueExpr(const OpaqueValueExpr *E) { 260547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith const CCValue *Value = Info.getOpaqueValue(E); 260642786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Value) { 260742786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis const Expr *Source = E->getSourceExpr(); 260842786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (!Source) 2609f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 261042786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis if (Source == E) { // sanity checking. 261142786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis assert(0 && "OpaqueValueExpr recursively refers to itself"); 2612f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 261342786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 261442786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis return StmtVisitorTy::Visit(Source); 261542786839cff1ccbe4d883b81d01846c5d774ffc6Argyrios Kyrtzidis } 261647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith return DerivedSuccess(*Value, E); 26178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 2618f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2619d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith RetTy VisitCallExpr(const CallExpr *E) { 2620e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Expr *Callee = E->getCallee()->IgnoreParens(); 2621d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith QualType CalleeType = Callee->getType(); 2622d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 26236142ca7790aa09a6e13592b70f142cc4bbcadcaeDevang Patel const FunctionDecl *FD = 0; 262459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith LValue *This = 0, ThisVal; 262559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 262686c3ae46250cdcc57778c27826060779a92f3815Richard Smith bool HasQualifier = false; 262759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 262859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Extract function decl and 'this' pointer from the callee. 262959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { 2630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const ValueDecl *Member = 0; 2631e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { 2632e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Explicit bound member calls, such as x.f() or p->g(); 2633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) 2634f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2635f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = ME->getMemberDecl(); 2636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 263786c3ae46250cdcc57778c27826060779a92f3815Richard Smith HasQualifier = ME->hasQualifier(); 2638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { 2639e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Indirect bound member calls ('.*' or '->*'). 2640f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Member = HandleMemberPointerAccess(Info, BE, ThisVal, false); 2641f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Member) return false; 2642e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith This = &ThisVal; 2643e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else 2644f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 2645f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 2646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith FD = dyn_cast<FunctionDecl>(Member); 2647f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) 2648f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 264959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else if (CalleeType->isFunctionPointerType()) { 2650b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith LValue Call; 2651b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!EvaluatePointer(Callee, Call, Info)) 2652f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 265359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 2654b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!Call.getLValueOffset().isZero()) 2655f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 26561bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith FD = dyn_cast_or_null<FunctionDecl>( 26571bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Call.getLValueBase().dyn_cast<const ValueDecl*>()); 265859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!FD) 2659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(Callee); 266059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 266159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Overloaded operator calls to member functions are represented as normal 266259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // calls with '*this' as the first argument. 266359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 266459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (MD && !MD->isStatic()) { 2665f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: When selecting an implicit conversion for an overloaded 2666f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operator delete, we sometimes try to evaluate calls to conversion 2667f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // operators without a 'this' parameter! 2668f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Args.empty()) 2669f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2670f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 267159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) 267259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 267359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith This = &ThisVal; 267459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Args = Args.slice(1); 267559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 2676d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 267759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Don't call function pointers which have been cast to some other type. 267859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) 2679f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 268059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } else 2681f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2682d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2683b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith if (This && !This->checkSubobject(Info, E, CSK_This)) 2684b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith return false; 2685b04035a7b1a3c9b93cea72ae56dd2ea6e787bae9Richard Smith 268686c3ae46250cdcc57778c27826060779a92f3815Richard Smith // DR1358 allows virtual constexpr functions in some cases. Don't allow 268786c3ae46250cdcc57778c27826060779a92f3815Richard Smith // calls to such functions in constant expressions. 268886c3ae46250cdcc57778c27826060779a92f3815Richard Smith if (This && !HasQualifier && 268986c3ae46250cdcc57778c27826060779a92f3815Richard Smith isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isVirtual()) 269086c3ae46250cdcc57778c27826060779a92f3815Richard Smith return Error(E, diag::note_constexpr_virtual_call); 269186c3ae46250cdcc57778c27826060779a92f3815Richard Smith 2692c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith const FunctionDecl *Definition = 0; 2693d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith Stmt *Body = FD->getBody(Definition); 269483587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Result; 2695d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2696c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition) || 2697745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, 2698745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Result)) 2699f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2700d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 270183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return DerivedSuccess(Result, E); 2702d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 2703d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 2704c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 2705c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getInitializer()); 2706c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2707f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitInitListExpr(const InitListExpr *E) { 270871523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 0) 270971523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return DerivedZeroInitialization(E); 271071523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman if (E->getNumInits() == 1) 271171523d6c41e1599fc42f420d02dd2895fd8f65d4Eli Friedman return StmtVisitorTy::Visit(E->getInit(0)); 2712f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2713f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2714f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { 271551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2716f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2717f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith RetTy VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { 271851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2719f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 2720e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RetTy VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { 272151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return DerivedZeroInitialization(E); 2722e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2723f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 2724180f47959a066795cc0f409433023af448bb0328Richard Smith /// A member expression where the object is a prvalue is itself a prvalue. 2725180f47959a066795cc0f409433023af448bb0328Richard Smith RetTy VisitMemberExpr(const MemberExpr *E) { 2726180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!E->isArrow() && "missing call to bound member function?"); 2727180f47959a066795cc0f409433023af448bb0328Richard Smith 2728180f47959a066795cc0f409433023af448bb0328Richard Smith CCValue Val; 2729180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Evaluate(Val, Info, E->getBase())) 2730180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2731180f47959a066795cc0f409433023af448bb0328Richard Smith 2732180f47959a066795cc0f409433023af448bb0328Richard Smith QualType BaseTy = E->getBase()->getType(); 2733180f47959a066795cc0f409433023af448bb0328Richard Smith 2734180f47959a066795cc0f409433023af448bb0328Richard Smith const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); 2735f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!FD) return Error(E); 2736180f47959a066795cc0f409433023af448bb0328Richard Smith assert(!FD->getType()->isReferenceType() && "prvalue reference?"); 2737180f47959a066795cc0f409433023af448bb0328Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2738180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2739180f47959a066795cc0f409433023af448bb0328Richard Smith 2740b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith SubobjectDesignator Designator(BaseTy); 2741b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Designator.addDeclUnchecked(FD); 2742180f47959a066795cc0f409433023af448bb0328Richard Smith 2743f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ExtractSubobject(Info, E, Val, BaseTy, Designator, E->getType()) && 2744180f47959a066795cc0f409433023af448bb0328Richard Smith DerivedSuccess(Val, E); 2745180f47959a066795cc0f409433023af448bb0328Richard Smith } 2746180f47959a066795cc0f409433023af448bb0328Richard Smith 2747c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RetTy VisitCastExpr(const CastExpr *E) { 2748c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith switch (E->getCastKind()) { 2749c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith default: 2750c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith break; 2751c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27527a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 27537a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 2754c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_NoOp: 27557d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 2756c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return StmtVisitorTy::Visit(E->getSubExpr()); 2757c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2758c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case CK_LValueToRValue: { 2759c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LVal; 2760f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) 2761f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2762f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue RVal; 27639ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith // Note, we use the subexpression's type in order to retain cv-qualifiers. 27649ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), 27659ec7197796a2730d54ae7f632553b5311b2ba3b5Richard Smith LVal, RVal)) 2766f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2767f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return DerivedSuccess(RVal, E); 2768c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2769c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2770c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 2771f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 2772c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 2773c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 27748327fad71da34492d82c532f42a58cb4baff81a3Richard Smith /// Visit a value which is evaluated, but whose value is ignored. 27758327fad71da34492d82c532f42a58cb4baff81a3Richard Smith void VisitIgnoredValue(const Expr *E) { 277647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Scratch; 27778327fad71da34492d82c532f42a58cb4baff81a3Richard Smith if (!Evaluate(Scratch, Info, E)) 27788327fad71da34492d82c532f42a58cb4baff81a3Richard Smith Info.EvalStatus.HasSideEffects = true; 27798327fad71da34492d82c532f42a58cb4baff81a3Richard Smith } 27808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne}; 27818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne} 27838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 27848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne//===----------------------------------------------------------------------===// 2785e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Common base class for lvalue and temporary evaluation. 2786e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 2787e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 2788e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithtemplate<class Derived> 2789e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass LValueExprEvaluatorBase 2790e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<Derived, bool> { 2791e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithprotected: 2792e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue &Result; 2793e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; 2794e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef ExprEvaluatorBase<Derived, bool> ExprEvaluatorBaseTy; 2795e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2796e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(APValue::LValueBase B) { 2797e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.set(B); 2798e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2799e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2800e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2801e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 2802e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result) : 2803e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith ExprEvaluatorBaseTy(Info), Result(Result) {} 2804e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2805e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 2806e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 2807e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2808e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2809e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2810e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitMemberExpr(const MemberExpr *E) { 2811e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Handle non-static data members. 2812e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType BaseTy; 2813e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isArrow()) { 2814e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluatePointer(E->getBase(), Result, this->Info)) 2815e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2816e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType(); 2817c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (E->getBase()->isRValue()) { 2818af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->getBase()->getType()->isRecordType()); 2819c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!EvaluateTemporary(E->getBase(), Result, this->Info)) 2820c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 2821c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith BaseTy = E->getBase()->getType(); 2822e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 2823e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getBase())) 2824e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2825e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith BaseTy = E->getBase()->getType(); 2826e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2827e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2828d9b02e726262e4009dda830998bb934172ac0020Richard Smith const ValueDecl *MD = E->getMemberDecl(); 2829d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { 2830d9b02e726262e4009dda830998bb934172ac0020Richard Smith assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == 2831d9b02e726262e4009dda830998bb934172ac0020Richard Smith FD->getParent()->getCanonicalDecl() && "record / field mismatch"); 2832d9b02e726262e4009dda830998bb934172ac0020Richard Smith (void)BaseTy; 2833d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueMember(this->Info, E, Result, FD); 2834d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { 2835d9b02e726262e4009dda830998bb934172ac0020Richard Smith HandleLValueIndirectMember(this->Info, E, Result, IFD); 2836d9b02e726262e4009dda830998bb934172ac0020Richard Smith } else 2837d9b02e726262e4009dda830998bb934172ac0020Richard Smith return this->Error(E); 2838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2839d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (MD->getType()->isReferenceType()) { 2840e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith CCValue RefValue; 2841d9b02e726262e4009dda830998bb934172ac0020Richard Smith if (!HandleLValueToRValueConversion(this->Info, E, MD->getType(), Result, 2842e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith RefValue)) 2843e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2844e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(RefValue, E); 2845e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2846e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2847e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2848e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2849e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitBinaryOperator(const BinaryOperator *E) { 2850e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getOpcode()) { 2851e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2852e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 2853e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2854e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemD: 2855e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case BO_PtrMemI: 2856e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleMemberPointerAccess(this->Info, E, Result); 2857e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2858e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2859e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2860e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 2861e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 2862e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 2863e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 2864e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2865e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBase: 2866e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_UncheckedDerivedToBase: { 2867e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!this->Visit(E->getSubExpr())) 2868e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2869e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2870e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Now figure out the necessary offset to add to the base LV to get from 2871e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the derived class to the base class. 2872e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith QualType Type = E->getSubExpr()->getType(); 2873e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2874e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 2875e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 2876b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(this->Info, E, Result, Type->getAsCXXRecordDecl(), 2877e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith *PathI)) 2878e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 2879e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Type = (*PathI)->getType(); 2880e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2881e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2882e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 2883e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2884e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2885e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 2886e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 2887e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 2888e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 2889e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 28904efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman// LValue Evaluation 2891c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2892c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// This is used for evaluating lvalues (in C and C++), xvalues (in C++11), 2893c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// function designators (in C), decl references to void objects (in C), and 2894c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// temporaries (if building with -Wno-address-of-temporary). 2895c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 2896c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// LValue evaluation produces values comprising a base expression of one of the 2897c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// following types: 28981bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Declarations 28991bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * VarDecl 29001bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// * FunctionDecl 29011bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Literals 2902c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CompoundLiteralExpr in C 2903c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * StringLiteral 290447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith// * CXXTypeidExpr 2905c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * PredefinedExpr 2906180f47959a066795cc0f409433023af448bb0328Richard Smith// * ObjCStringLiteralExpr 2907c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * ObjCEncodeExpr 2908c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * AddrLabelExpr 2909c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * BlockExpr 2910c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// * CallExpr for a MakeStringConstant builtin 29111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// - Locals and temporaries 291283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// * Any Expr, with a CallIndex indicating the function in which the temporary 291383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith// was evaluated. 29141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith// plus an offset in bytes. 29154efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 29164efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmannamespace { 2917770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass LValueExprEvaluator 2918e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<LValueExprEvaluator> { 29194efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedmanpublic: 2920e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluator(EvalInfo &Info, LValue &Result) : 2921e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 29221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2923c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith bool VisitVarDecl(const Expr *E, const VarDecl *VD); 2924c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 29258cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitDeclRefExpr(const DeclRefExpr *E); 29268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } 2927bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); 29288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); 29298cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitMemberExpr(const MemberExpr *E); 29308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } 29318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } 293247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); 29338cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); 29348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitUnaryDeref(const UnaryOperator *E); 293586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryReal(const UnaryOperator *E); 293686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 29378cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 29388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E) { 293926bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson switch (E->getCastKind()) { 294026bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson default: 2941e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 294226bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson 2943db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman case CK_LValueBitCast: 2944c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 29450a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (!Visit(E->getSubExpr())) 29460a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return false; 29470a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 29480a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 2949db924224b51b153f24fbe492102d4edebcbbb7f4Eli Friedman 2950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 2951180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Visit(E->getSubExpr())) 2952180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 2953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 295426bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 295526bc220377705292a0519a71d3ea3aef68fcfec6Anders Carlsson } 29564efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman}; 29574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} // end anonymous namespace 29584efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 2959c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Evaluate an expression as an lvalue. This can be legitimately called on 2960c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// expressions which are not glvalues, in a few cases: 2961c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * function designators in C, 2962c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * "extern void" objects, 2963c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// * temporaries, if building with -Wno-address-of-temporary. 2964efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) { 2965c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert((E->isGLValue() || E->getType()->isFunctionType() || 2966c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith E->getType()->isVoidType() || isa<CXXTemporaryObjectExpr>(E)) && 2967c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith "can't evaluate expression as an lvalue"); 29688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return LValueExprEvaluator(Info, Result).Visit(E); 29694efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 29704efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 29718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { 29721bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) 29731bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(FD); 29741bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) 2975c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 2976c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Error(E); 2977c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith} 2978436c8898cd1c93c5bacd3fcc4ac586bc5cd77062Richard Smith 2979c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smithbool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { 2980177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (!VD->getType()->isReferenceType()) { 2981177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith if (isa<ParmVarDecl>(VD)) { 298283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(VD, Info.CurrentCall->Index); 2983177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith return true; 2984177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 29851bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(VD); 2986177dce777596e68d111d6d3e6046f3ddfc96bd07Richard Smith } 298750c39ea4858265f3f5f42a0c624557ce2281936bEli Friedman 298847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue V; 2989f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V)) 2990f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 2991f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(V, E); 299235873c49adad211ff466e34342a52665742794f5Anders Carlsson} 299335873c49adad211ff466e34342a52665742794f5Anders Carlsson 2994bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smithbool LValueExprEvaluator::VisitMaterializeTemporaryExpr( 2995bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith const MaterializeTemporaryExpr *E) { 2996e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->GetTemporaryExpr()->isRValue()) { 2997af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith if (E->getType()->isRecordType()) 2998e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return EvaluateTemporary(E->GetTemporaryExpr(), Result, Info); 2999e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 300083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 300183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, 300283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result, E->GetTemporaryExpr()); 3003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3004e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Materialization of an lvalue temporary occurs when we need to force a copy 3006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // (for instance, if it's a bitfield). 3007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The AST should contain an lvalue-to-rvalue node for such cases. 3008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->GetTemporaryExpr())) 3009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3010f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), Result, 3011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info.CurrentCall->Temporaries[E])) 3012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 301383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 3014e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3015bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith} 3016bd552efbeff3a64a1c400d2bba18f13f84abd8abRichard Smith 30178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool 30188cad3046be06ea73ff8892d947697a21d7a440d3Peter CollingbourneLValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { 3019c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in c++?"); 3020c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Defer visiting the literal until the lvalue-to-rvalue conversion. We can 3021c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // only see this when folding in C, so there's no standard to follow here. 3022efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 30234efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30244efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 302547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smithbool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { 302647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (E->isTypeOperand()) 302747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 302847d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith CXXRecordDecl *RD = E->getExprOperand()->getType()->getAsCXXRecordDecl(); 302947d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith if (RD && RD->isPolymorphic()) { 303047d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_typeid_polymorphic) 303147d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getType() 303247d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith << E->getExprOperand()->getSourceRange(); 303347d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return false; 303447d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith } 303547d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith return Success(E); 303647d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith} 303747d2145675099893d702be4bc06bd9f26d8ddd13Richard Smith 30388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { 3039c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // Handle static data members. 3040c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { 3041c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 3042c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return VisitVarDecl(E, VD); 3043c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } 3044c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 3045d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith // Handle static member functions. 3046d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { 3047d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith if (MD->isStatic()) { 3048d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith VisitIgnoredValue(E->getBase()); 30491bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return Success(MD); 3050d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 3051d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith } 3052d0dcceae2a8ca0e37b5dd471a704de8583d49c95Richard Smith 3053180f47959a066795cc0f409433023af448bb0328Richard Smith // Handle non-static data members. 3054e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); 30554efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 30564efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30578cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { 3058c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // FIXME: Deal with vectors as array subscript bases. 3059c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->getBase()->getType()->isVectorType()) 3060f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3061c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 30623068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluatePointer(E->getBase(), Result, Info)) 3063efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 30641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30653068d117951a8df54bae9db039b56201ab10962bAnders Carlsson APSInt Index; 30663068d117951a8df54bae9db039b56201ab10962bAnders Carlsson if (!EvaluateInteger(E->getIdx(), Index, Info)) 3067efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3068180f47959a066795cc0f409433023af448bb0328Richard Smith int64_t IndexValue 3069180f47959a066795cc0f409433023af448bb0328Richard Smith = Index.isSigned() ? Index.getSExtValue() 3070180f47959a066795cc0f409433023af448bb0328Richard Smith : static_cast<int64_t>(Index.getZExtValue()); 30713068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 3072b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, E->getType(), IndexValue); 30733068d117951a8df54bae9db039b56201ab10962bAnders Carlsson} 30744efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 30758cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { 3076efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluatePointer(E->getSubExpr(), Result, Info); 3077e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman} 3078e8761c8fe2ee6b628104a0885f49fd3c21c08a4fEli Friedman 307986024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 308086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 308186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 308286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith // __real is a no-op on scalar lvalues. 308386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (E->getSubExpr()->getType()->isAnyComplexType()) 308486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), false); 308586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 308686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 308786024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 308886024013d4c3728122c58fa07a2a67e6c15837efRichard Smithbool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 308986024013d4c3728122c58fa07a2a67e6c15837efRichard Smith assert(E->getSubExpr()->getType()->isAnyComplexType() && 309086024013d4c3728122c58fa07a2a67e6c15837efRichard Smith "lvalue __imag__ on scalar?"); 309186024013d4c3728122c58fa07a2a67e6c15837efRichard Smith if (!Visit(E->getSubExpr())) 309286024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return false; 309386024013d4c3728122c58fa07a2a67e6c15837efRichard Smith HandleLValueComplexElement(Info, E, Result, E->getType(), true); 309486024013d4c3728122c58fa07a2a67e6c15837efRichard Smith return true; 309586024013d4c3728122c58fa07a2a67e6c15837efRichard Smith} 309686024013d4c3728122c58fa07a2a67e6c15837efRichard Smith 30974efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman//===----------------------------------------------------------------------===// 3098f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Pointer Evaluation 3099f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3100f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3101c754aa62643e66ab967ca32ae8b0b3fc419bba25Anders Carlssonnamespace { 3102770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass PointerExprEvaluator 31038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<PointerExprEvaluator, bool> { 3104efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue &Result; 3105efdb83e26f9a1fd2566afe54461216cd84814d42John McCall 31068cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool Success(const Expr *E) { 31071bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.set(E); 3108efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3109efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } 31102bad1687fe6f00e10767a691a33b070b151902b6Anders Carlssonpublic: 31111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3112efdb83e26f9a1fd2566afe54461216cd84814d42John McCall PointerExprEvaluator(EvalInfo &info, LValue &Result) 31138cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 3114f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 311547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 31168cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 31178cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 31182bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 311951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3120f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return Success((Expr*)0); 3121f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 31222bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3123efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitBinaryOperator(const BinaryOperator *E); 31248cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 3125efdb83e26f9a1fd2566afe54461216cd84814d42John McCall bool VisitUnaryAddrOf(const UnaryOperator *E); 31268cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitObjCStringLiteral(const ObjCStringLiteral *E) 3127efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 31288cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitAddrLabelExpr(const AddrLabelExpr *E) 3129efdb83e26f9a1fd2566afe54461216cd84814d42John McCall { return Success(E); } 31308cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 31318cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitBlockExpr(const BlockExpr *E) { 3132469a1eb996e1cb0be54f9b210f836afbddcbb2ccJohn McCall if (!E->getBlockDecl()->hasCaptures()) 3133efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 3134f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3135b83d287bc7f47d36fb0751a481e2ef9308b37252Mike Stump } 3136180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXThisExpr(const CXXThisExpr *E) { 3137180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Info.CurrentCall->This) 3138f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3139180f47959a066795cc0f409433023af448bb0328Richard Smith Result = *Info.CurrentCall->This; 3140180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3141180f47959a066795cc0f409433023af448bb0328Richard Smith } 314256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 3143ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman // FIXME: Missing: @protocol, @selector 31442bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson}; 3145f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 31462bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 3147efdb83e26f9a1fd2566afe54461216cd84814d42John McCallstatic bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info) { 3148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->hasPointerRepresentation()); 31498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return PointerExprEvaluator(Info, Result).Visit(E); 3150f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 3151650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3152efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 31532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() != BO_Add && 31542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall E->getOpcode() != BO_Sub) 3155e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 31561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3157650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *PExp = E->getLHS(); 3158650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson const Expr *IExp = E->getRHS(); 3159650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson if (IExp->getType()->isPointerType()) 3160f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner std::swap(PExp, IExp); 31611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3162745f5147e065900267c85a5568785a1991d4838fRichard Smith bool EvalPtrOK = EvaluatePointer(PExp, Result, Info); 3163745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvalPtrOK && !Info.keepEvaluatingAfterFailure()) 3164efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 31651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3166efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APSInt Offset; 3167745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) 3168efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return false; 3169efdb83e26f9a1fd2566afe54461216cd84814d42John McCall int64_t AdditionalOffset 3170efdb83e26f9a1fd2566afe54461216cd84814d42John McCall = Offset.isSigned() ? Offset.getSExtValue() 3171efdb83e26f9a1fd2566afe54461216cd84814d42John McCall : static_cast<int64_t>(Offset.getZExtValue()); 31720a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith if (E->getOpcode() == BO_Sub) 31730a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith AdditionalOffset = -AdditionalOffset; 3174650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 3175180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType(); 3176b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleLValueArrayAdjustment(Info, E, Result, Pointee, 3177b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith AdditionalOffset); 3178650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson} 31794efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3180efdb83e26f9a1fd2566afe54461216cd84814d42John McCallbool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3181efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return EvaluateLValue(E->getSubExpr(), Result, Info); 31824efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 31831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 31848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) { 31858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 3186650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 318709a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman switch (E->getCastKind()) { 318809a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman default: 318909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 319009a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 31912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BitCast: 31921d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 31931d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 31942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_AnyPointerToBlockPointerCast: 319528c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith if (!Visit(SubExpr)) 319628c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith return false; 3197c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are 3198c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // permitted in constant expressions in C++11. Bitcasts from cv void* are 3199c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith // also static_casts, but we disallow them as a resolution to DR1312. 32004cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (!E->getType()->isVoidPointerType()) { 320128c1ce789322ab99f9b5887015d63ec5f088957aRichard Smith Result.Designator.setInvalid(); 32024cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith if (SubExpr->getType()->isVoidPointerType()) 32034cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) 32044cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith << 3 << SubExpr->getType(); 32054cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith else 32064cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 32074cd9b8f7fb2cebf614e6e2bc766fad27ffd2e9deRichard Smith } 32080a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 320909a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman 32105c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_DerivedToBase: 32115c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson case CK_UncheckedDerivedToBase: { 321247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith if (!EvaluatePointer(E->getSubExpr(), Result, Info)) 32135c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3214e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3215e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 32165c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3217180f47959a066795cc0f409433023af448bb0328Richard Smith // Now figure out the necessary offset to add to the base LV to get from 32185c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson // the derived class to the base class. 3219180f47959a066795cc0f409433023af448bb0328Richard Smith QualType Type = 3220180f47959a066795cc0f409433023af448bb0328Richard Smith E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType(); 32215c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3222180f47959a066795cc0f409433023af448bb0328Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 32235c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson PathE = E->path_end(); PathI != PathE; ++PathI) { 3224b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), 3225b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith *PathI)) 32265c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return false; 3227180f47959a066795cc0f409433023af448bb0328Richard Smith Type = (*PathI)->getType(); 32285c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 32295c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 32305c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson return true; 32315c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson } 32325c5a764fcd256df6f6cfbce5cdd2a2dfb2c45e95Anders Carlsson 3233e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerived: 3234e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3235e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3236e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.Base && Result.Offset.isZero()) 3237e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3238e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return HandleBaseToDerivedCast(Info, E, Result); 3239e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 324047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith case CK_NullToPointer: 324151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3242404cd1669c3ba138a9ae0a619bd689cce5aae271John McCall 32432de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_IntegralToPointer: { 3244c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 3245c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 324647a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Value; 3247efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) 324809a8a0e6ec1252cad52666e9dbb21002b9c80f38Eli Friedman break; 324969ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 3250efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (Value.isInt()) { 325147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith unsigned Size = Info.Ctx.getTypeSize(E->getType()); 325247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); 32531bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith Result.Base = (Expr*)0; 325447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.Offset = CharUnits::fromQuantity(N); 325583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.CallIndex = 0; 32560a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith Result.Designator.setInvalid(); 3257efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3258efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else { 3259efdb83e26f9a1fd2566afe54461216cd84814d42John McCall // Cast is of an lvalue, no need to change value. 326047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result.setFrom(Value); 3261efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return true; 3262650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 3263650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson } 32642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ArrayToPointerDecay: 3265e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (SubExpr->isGLValue()) { 3266e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateLValue(SubExpr, Result, Info)) 3267e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3268e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } else { 326983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(SubExpr, Info.CurrentCall->Index); 327083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Info.CurrentCall->Temporaries[SubExpr], 327183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Result, SubExpr)) 3272e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3273e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 32740a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith // The result is a pointer to the first element of the array. 3275b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (const ConstantArrayType *CAT 3276b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith = Info.Ctx.getAsConstantArrayType(SubExpr->getType())) 3277b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.addArray(Info, E, CAT); 3278b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith else 3279b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Result.Designator.setInvalid(); 32800a3bdb646ee0318667f4cebec6792d2548fb9950Richard Smith return true; 32816a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith 32822de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_FunctionToPointerDecay: 32836a7c94af983717e2c2d6aebe42cb4737c1c7b9e6Richard Smith return EvaluateLValue(SubExpr, Result, Info); 32844efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 32854efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 3286c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 32871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 3288650c92fdcc27a950a8a848ecab6a74e6f5e80788Anders Carlsson 32898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { 3290180f47959a066795cc0f409433023af448bb0328Richard Smith if (IsStringLiteralCall(E)) 3291efdb83e26f9a1fd2566afe54461216cd84814d42John McCall return Success(E); 329256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 32938cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 32944efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 3295f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 3296f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 3297e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Member Pointer Evaluation 3298e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3299e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3300e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3301e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass MemberPointerExprEvaluator 3302e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public ExprEvaluatorBase<MemberPointerExprEvaluator, bool> { 3303e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr &Result; 3304e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3305e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const ValueDecl *D) { 3306e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result = MemberPtr(D); 3307e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3308e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3309e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3310e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3311e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) 3312e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : ExprEvaluatorBaseTy(Info), Result(Result) {} 3313e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3314e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool Success(const CCValue &V, const Expr *E) { 3315e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Result.setFrom(V); 3316e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3317e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 331851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3319e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success((const ValueDecl*)0); 3320e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3321e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3322e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E); 3323e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitUnaryAddrOf(const UnaryOperator *E); 3324e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3325e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3326e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3327e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, 3328e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith EvalInfo &Info) { 3329e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(E->isRValue() && E->getType()->isMemberPointerType()); 3330e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return MemberPointerExprEvaluator(Info, Result).Visit(E); 3331e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3332e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3333e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { 3334e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3335e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3336e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3337e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3338e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_NullToMemberPointer: 333951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 3340e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3341e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_BaseToDerivedMemberPointer: { 3342e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3343e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3344e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->path_empty()) 3345e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3346e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // Base-to-derived member pointer casts store the path in derived-to-base 3347e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // order, so iterate backwards. The CXXBaseSpecifier also provides us with 3348e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // the wrong end of the derived->base arc, so stagger the path by one class. 3349e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; 3350e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); 3351e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathI != PathE; ++PathI) { 3352e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3353e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); 3354e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(Derived)) 3355f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3356e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3357e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); 3358e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) 3359f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3360e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3361e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3362e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3363e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_DerivedToBaseMemberPointer: 3364e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Visit(E->getSubExpr())) 3365e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 3366e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 3367e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 3368e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith assert(!(*PathI)->isVirtual() && "memptr cast through vbase"); 3369e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 3370e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.castToBase(Base)) 3371f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3372e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3373e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3374e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3375e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3376e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3377e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { 3378e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // C++11 [expr.unary.op]p3 has very strict rules on how the address of a 3379e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // member can be formed. 3380e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); 3381e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3382e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3383e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3384180f47959a066795cc0f409433023af448bb0328Richard Smith// Record Evaluation 3385180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3386180f47959a066795cc0f409433023af448bb0328Richard Smith 3387180f47959a066795cc0f409433023af448bb0328Richard Smithnamespace { 3388180f47959a066795cc0f409433023af448bb0328Richard Smith class RecordExprEvaluator 3389180f47959a066795cc0f409433023af448bb0328Richard Smith : public ExprEvaluatorBase<RecordExprEvaluator, bool> { 3390180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3391180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result; 3392180f47959a066795cc0f409433023af448bb0328Richard Smith public: 3393180f47959a066795cc0f409433023af448bb0328Richard Smith 3394180f47959a066795cc0f409433023af448bb0328Richard Smith RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) 3395180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} 3396180f47959a066795cc0f409433023af448bb0328Richard Smith 3397180f47959a066795cc0f409433023af448bb0328Richard Smith bool Success(const CCValue &V, const Expr *E) { 339883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = V; 339983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 3400180f47959a066795cc0f409433023af448bb0328Richard Smith } 340151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 3402180f47959a066795cc0f409433023af448bb0328Richard Smith 340359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith bool VisitCastExpr(const CastExpr *E); 3404180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3405180f47959a066795cc0f409433023af448bb0328Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3406180f47959a066795cc0f409433023af448bb0328Richard Smith }; 3407180f47959a066795cc0f409433023af448bb0328Richard Smith} 3408180f47959a066795cc0f409433023af448bb0328Richard Smith 340951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// Perform zero-initialization on an object of non-union class type. 341051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// C++11 [dcl.init]p5: 341151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// To zero-initialize an object or reference of type T means: 341251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// [...] 341351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// -- if T is a (possibly cv-qualified) non-union class type, 341451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// each non-static data member and each base-class subobject is 341551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith/// zero-initialized 3416b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smithstatic bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, 3417b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith const RecordDecl *RD, 341851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const LValue &This, APValue &Result) { 341951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(!RD->isUnion() && "Expected non-union class type"); 342051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); 342151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, 342251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith std::distance(RD->field_begin(), RD->field_end())); 342351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 342551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 342651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CD) { 342751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith unsigned Index = 0; 342851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), 3429b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith End = CD->bases_end(); I != End; ++I, ++Index) { 343051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 343151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3432b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout); 3433b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith if (!HandleClassZeroInitialization(Info, E, Base, Subobject, 343451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructBase(Index))) 343551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 343651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 343751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 343851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3439b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith for (RecordDecl::field_iterator I = RD->field_begin(), End = RD->field_end(); 3440b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith I != End; ++I) { 344151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // -- if T is a reference type, no initialization is performed. 344251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if ((*I)->getType()->isReferenceType()) 344351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith continue; 344451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 344551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3446b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I, &Layout); 344751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 344851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 344983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 345051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result.getStructField((*I)->getFieldIndex()), Info, Subobject, &VIE)) 345151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 345251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 345351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 345451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 345551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 345651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 345751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smithbool RecordExprEvaluator::ZeroInitialization(const Expr *E) { 345851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 345951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (RD->isUnion()) { 346051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the 346151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // object's first non-static named data member is zero-initialized 346251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith RecordDecl::field_iterator I = RD->field_begin(); 346351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (I == RD->field_end()) { 346451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue((const FieldDecl*)0); 346551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return true; 346651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 346751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 346851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3469b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleLValueMember(Info, E, Subobject, *I); 347051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith Result = APValue(*I); 347151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE((*I)->getType()); 347283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); 347351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 347451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3475ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { 3476ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_virtual_base) << RD; 3477ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith return false; 3478ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith } 3479ce582fe2a7aad8b14b3636ad9cac0a3b8bbb219bRichard Smith 3480b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith return HandleClassZeroInitialization(Info, E, RD, This, Result); 348151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith} 348251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 348359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smithbool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { 348459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith switch (E->getCastKind()) { 348559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith default: 348659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 348759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 348859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_ConstructorConversion: 348959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return Visit(E->getSubExpr()); 349059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 349159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_DerivedToBase: 349259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith case CK_UncheckedDerivedToBase: { 349359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith CCValue DerivedObject; 3494f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Evaluate(DerivedObject, Info, E->getSubExpr())) 349559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return false; 3496f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!DerivedObject.isStruct()) 3497f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E->getSubExpr()); 349859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 349959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith // Derived-to-base rvalue conversion: just slice off the derived part. 350059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith APValue *Value = &DerivedObject; 350159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); 350259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith for (CastExpr::path_const_iterator PathI = E->path_begin(), 350359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith PathE = E->path_end(); PathI != PathE; ++PathI) { 350459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith assert(!(*PathI)->isVirtual() && "record rvalue with virtual base"); 350559efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); 350659efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Value = &Value->getStructBase(getBaseIndex(RD, Base)); 350759efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith RD = Base; 350859efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 350959efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith Result = *Value; 351059efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith return true; 351159efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 351259efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith } 351359efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith} 351459efe266b804330f4c1f3a1b0ff783e67dd90378Richard Smith 3515180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 351624fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl // Cannot constant-evaluate std::initializer_list inits. 351724fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl if (E->initializesStdInitializerList()) 351824fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl return false; 351924fe798fffc1748d8bce1321af42981c3719cb85Sebastian Redl 3520180f47959a066795cc0f409433023af448bb0328Richard Smith const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); 3521180f47959a066795cc0f409433023af448bb0328Richard Smith const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); 3522180f47959a066795cc0f409433023af448bb0328Richard Smith 3523180f47959a066795cc0f409433023af448bb0328Richard Smith if (RD->isUnion()) { 3524ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const FieldDecl *Field = E->getInitializedFieldInUnion(); 3525ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(Field); 3526ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Field) 3527180f47959a066795cc0f409433023af448bb0328Richard Smith return true; 3528ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3529ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If the initializer list for a union does not contain any elements, the 3530ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // first element of the union is value-initialized. 3531ec789163a42a7be654ac34aadb750b508954d53cRichard Smith ImplicitValueInitExpr VIE(Field->getType()); 3532ec789163a42a7be654ac34aadb750b508954d53cRichard Smith const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; 3533ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 3534180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3535ec789163a42a7be654ac34aadb750b508954d53cRichard Smith HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout); 353683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); 3537180f47959a066795cc0f409433023af448bb0328Richard Smith } 3538180f47959a066795cc0f409433023af448bb0328Richard Smith 3539180f47959a066795cc0f409433023af448bb0328Richard Smith assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) && 3540180f47959a066795cc0f409433023af448bb0328Richard Smith "initializer list for class with base classes"); 3541180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitStruct(), 0, 3542180f47959a066795cc0f409433023af448bb0328Richard Smith std::distance(RD->field_begin(), RD->field_end())); 3543180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned ElementNo = 0; 3544745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3545180f47959a066795cc0f409433023af448bb0328Richard Smith for (RecordDecl::field_iterator Field = RD->field_begin(), 3546180f47959a066795cc0f409433023af448bb0328Richard Smith FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) { 3547180f47959a066795cc0f409433023af448bb0328Richard Smith // Anonymous bit-fields are not considered members of the class for 3548180f47959a066795cc0f409433023af448bb0328Richard Smith // purposes of aggregate initialization. 3549180f47959a066795cc0f409433023af448bb0328Richard Smith if (Field->isUnnamedBitfield()) 3550180f47959a066795cc0f409433023af448bb0328Richard Smith continue; 3551180f47959a066795cc0f409433023af448bb0328Richard Smith 3552180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3553180f47959a066795cc0f409433023af448bb0328Richard Smith 3554745f5147e065900267c85a5568785a1991d4838fRichard Smith bool HaveInit = ElementNo < E->getNumInits(); 3555745f5147e065900267c85a5568785a1991d4838fRichard Smith 3556745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Diagnostics here should point to the end of the initializer 3557745f5147e065900267c85a5568785a1991d4838fRichard Smith // list, not the start. 3558745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, Subobject, 3559745f5147e065900267c85a5568785a1991d4838fRichard Smith *Field, &Layout); 3560745f5147e065900267c85a5568785a1991d4838fRichard Smith 3561745f5147e065900267c85a5568785a1991d4838fRichard Smith // Perform an implicit value-initialization for members beyond the end of 3562745f5147e065900267c85a5568785a1991d4838fRichard Smith // the initializer list. 3563745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); 3564745f5147e065900267c85a5568785a1991d4838fRichard Smith 356583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace( 3566745f5147e065900267c85a5568785a1991d4838fRichard Smith Result.getStructField((*Field)->getFieldIndex()), 3567745f5147e065900267c85a5568785a1991d4838fRichard Smith Info, Subobject, HaveInit ? E->getInit(ElementNo++) : &VIE)) { 3568745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3569180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 3570745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3571180f47959a066795cc0f409433023af448bb0328Richard Smith } 3572180f47959a066795cc0f409433023af448bb0328Richard Smith } 3573180f47959a066795cc0f409433023af448bb0328Richard Smith 3574745f5147e065900267c85a5568785a1991d4838fRichard Smith return Success; 3575180f47959a066795cc0f409433023af448bb0328Richard Smith} 3576180f47959a066795cc0f409433023af448bb0328Richard Smith 3577180f47959a066795cc0f409433023af448bb0328Richard Smithbool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3578180f47959a066795cc0f409433023af448bb0328Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 357951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 358051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3581ec789163a42a7be654ac34aadb750b508954d53cRichard Smith // If we've already performed zero-initialization, we're already done. 3582ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!Result.isUninit()) 3583ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3584ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 358551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) 358651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 358751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 35886180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 35896180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 35906180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue((FieldDecl*)0); 35916180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 35926180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result = APValue(APValue::UninitStruct(), RD->getNumBases(), 35936180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 35946180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 35956180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 35966180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3597180f47959a066795cc0f409433023af448bb0328Richard Smith const FunctionDecl *Definition = 0; 3598180f47959a066795cc0f409433023af448bb0328Richard Smith FD->getBody(Definition); 3599180f47959a066795cc0f409433023af448bb0328Richard Smith 3600c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3601c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3602180f47959a066795cc0f409433023af448bb0328Richard Smith 3603610a60c0e68e34db5a5247d6102e58f37510fef8Richard Smith // Avoid materializing a temporary for an elidable copy/move constructor. 360451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isElidable() && !ZeroInit) 3605180f47959a066795cc0f409433023af448bb0328Richard Smith if (const MaterializeTemporaryExpr *ME 3606180f47959a066795cc0f409433023af448bb0328Richard Smith = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) 3607180f47959a066795cc0f409433023af448bb0328Richard Smith return Visit(ME->GetTemporaryExpr()); 3608180f47959a066795cc0f409433023af448bb0328Richard Smith 360951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit && !ZeroInitialization(E)) 361051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 361151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3612180f47959a066795cc0f409433023af448bb0328Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 3613745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), This, Args, 3614f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith cast<CXXConstructorDecl>(Definition), Info, 3615f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith Result); 3616180f47959a066795cc0f409433023af448bb0328Richard Smith} 3617180f47959a066795cc0f409433023af448bb0328Richard Smith 3618180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateRecord(const Expr *E, const LValue &This, 3619180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 3620180f47959a066795cc0f409433023af448bb0328Richard Smith assert(E->isRValue() && E->getType()->isRecordType() && 3621180f47959a066795cc0f409433023af448bb0328Richard Smith "can't evaluate expression as a record rvalue"); 3622180f47959a066795cc0f409433023af448bb0328Richard Smith return RecordExprEvaluator(Info, This, Result).Visit(E); 3623180f47959a066795cc0f409433023af448bb0328Richard Smith} 3624180f47959a066795cc0f409433023af448bb0328Richard Smith 3625180f47959a066795cc0f409433023af448bb0328Richard Smith//===----------------------------------------------------------------------===// 3626e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporary Evaluation 3627e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// 3628e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// Temporaries are represented in the AST as rvalues, but generally behave like 3629e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// lvalues. The full-object of which the temporary is a subobject is implicitly 3630e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith// materialized so that a reference can bind to it. 3631e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 3632e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithnamespace { 3633e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithclass TemporaryExprEvaluator 3634e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { 3635e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithpublic: 3636e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : 3637e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValueExprEvaluatorBaseTy(Info, Result) {} 3638e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3639e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith /// Visit an expression which constructs the value of this temporary. 3640e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitConstructExpr(const Expr *E) { 364183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.set(E, Info.CurrentCall->Index); 364283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Info.CurrentCall->Temporaries[E], Info, Result, E); 3643e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3644e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3645e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCastExpr(const CastExpr *E) { 3646e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith switch (E->getCastKind()) { 3647e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith default: 3648e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return LValueExprEvaluatorBaseTy::VisitCastExpr(E); 3649e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3650e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith case CK_ConstructorConversion: 3651e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E->getSubExpr()); 3652e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3653e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3654e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitInitListExpr(const InitListExpr *E) { 3655e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3656e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3657e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E) { 3658e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3659e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3660e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCallExpr(const CallExpr *E) { 3661e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return VisitConstructExpr(E); 3662e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith } 3663e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith}; 3664e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} // end anonymous namespace 3665e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3666e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith/// Evaluate an expression of record type as a temporary. 3667e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithstatic bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { 3668af2c7a194592401394233b7cbcdd3cfd0a7a38ddRichard Smith assert(E->isRValue() && E->getType()->isRecordType()); 3669e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return TemporaryExprEvaluator(Info, Result).Visit(E); 3670e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 3671e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3672e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith//===----------------------------------------------------------------------===// 367359b5da6d853b4368b984700315adf7b37de05764Nate Begeman// Vector Evaluation 367459b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 367559b5da6d853b4368b984700315adf7b37de05764Nate Begeman 367659b5da6d853b4368b984700315adf7b37de05764Nate Begemannamespace { 3677770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramer class VectorExprEvaluator 367807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : public ExprEvaluatorBase<VectorExprEvaluator, bool> { 367907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue &Result; 368059b5da6d853b4368b984700315adf7b37de05764Nate Begeman public: 36811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 368207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith VectorExprEvaluator(EvalInfo &info, APValue &Result) 368307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith : ExprEvaluatorBaseTy(info), Result(Result) {} 36841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 368507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool Success(const ArrayRef<APValue> &V, const Expr *E) { 368607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements()); 368707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith // FIXME: remove this APValue copy. 368807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = APValue(V.data(), V.size()); 368907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 369007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 369169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith bool Success(const CCValue &V, const Expr *E) { 369269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith assert(V.isVector()); 369307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Result = V; 369407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return true; 369507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith } 369651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E); 36971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 369807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryReal(const UnaryOperator *E) 369991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman { return Visit(E->getSubExpr()); } 370007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitCastExpr(const CastExpr* E); 370107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitInitListExpr(const InitListExpr *E); 370207fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith bool VisitUnaryImag(const UnaryOperator *E); 370391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, 37042217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman // binary comparisons, binary and/or/xor, 370591110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman // shufflevector, ExtVectorElementExpr 370659b5da6d853b4368b984700315adf7b37de05764Nate Begeman }; 370759b5da6d853b4368b984700315adf7b37de05764Nate Begeman} // end anonymous namespace 370859b5da6d853b4368b984700315adf7b37de05764Nate Begeman 370959b5da6d853b4368b984700315adf7b37de05764Nate Begemanstatic bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { 3710c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue"); 371107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return VectorExprEvaluator(Info, Result).Visit(E); 371259b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 371359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 371407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitCastExpr(const CastExpr* E) { 371507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VTy = E->getType()->castAs<VectorType>(); 3716c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman unsigned NElts = VTy->getNumElements(); 37171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3718d62ca370b03b8c6ad58002d3399383baf744e32bRichard Smith const Expr *SE = E->getSubExpr(); 3719e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman QualType SETy = SE->getType(); 372059b5da6d853b4368b984700315adf7b37de05764Nate Begeman 372146a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 372246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: { 372307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith APValue Val = APValue(); 372446a523285928aa07bf14803178dc04616ac85994Eli Friedman if (SETy->isIntegerType()) { 372546a523285928aa07bf14803178dc04616ac85994Eli Friedman APSInt IntResult; 372646a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateInteger(SE, IntResult, Info)) 3727f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 372807fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(IntResult); 372946a523285928aa07bf14803178dc04616ac85994Eli Friedman } else if (SETy->isRealFloatingType()) { 373046a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 373146a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SE, F, Info)) 3732f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 373307fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith Val = APValue(F); 373446a523285928aa07bf14803178dc04616ac85994Eli Friedman } else { 373507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Error(E); 373646a523285928aa07bf14803178dc04616ac85994Eli Friedman } 3737c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman 3738c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman // Splat and create vector APValue. 373907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith SmallVector<APValue, 4> Elts(NElts, Val); 374007fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elts, E); 3741e8c9e9218f215ec6089f12b076c7b9d310fd5194Nate Begeman } 3742e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman case CK_BitCast: { 3743e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Evaluate the operand into an APInt we can extract from. 3744e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt SValInt; 3745e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) 3746e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return false; 3747e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman // Extract the elements 3748e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman QualType EltTy = VTy->getElementType(); 3749e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned EltSize = Info.Ctx.getTypeSize(EltTy); 3750e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); 3751e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman SmallVector<APValue, 4> Elts; 3752e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (EltTy->isRealFloatingType()) { 3753e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); 3754e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman bool isIEESem = &Sem != &APFloat::PPCDoubleDouble; 3755e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman unsigned FloatEltSize = EltSize; 3756e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (&Sem == &APFloat::x87DoubleExtended) 3757e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman FloatEltSize = 80; 3758e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3759e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3760e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3761e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); 3762e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3763e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); 3764e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APFloat(Elt, isIEESem))); 3765e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3766e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else if (EltTy->isIntegerType()) { 3767e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman for (unsigned i = 0; i < NElts; i++) { 3768e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman llvm::APInt Elt; 3769e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman if (BigEndian) 3770e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); 3771e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman else 3772e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); 3773e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); 3774e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3775e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } else { 3776e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Error(E); 3777e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 3778e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman return Success(Elts, E); 3779e6a24e83e71f361c7b7de82cf24ee6f5ddc7f1c2Eli Friedman } 378046a523285928aa07bf14803178dc04616ac85994Eli Friedman default: 3781c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 3782c0b8b19bd8056d6b5d831623a0825cce150f4507Nate Begeman } 378359b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 378459b5da6d853b4368b984700315adf7b37de05764Nate Begeman 378507fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 378659b5da6d853b4368b984700315adf7b37de05764Nate BegemanVectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 378707fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->castAs<VectorType>(); 378859b5da6d853b4368b984700315adf7b37de05764Nate Begeman unsigned NumInits = E->getNumInits(); 378991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman unsigned NumElements = VT->getNumElements(); 37901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 379159b5da6d853b4368b984700315adf7b37de05764Nate Begeman QualType EltTy = VT->getElementType(); 37925f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements; 379359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 37943edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // The number of initializers can be less than the number of 37953edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // vector elements. For OpenCL, this can be due to nested vector 37963edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // initialization. For GCC compatibility, missing trailing elements 37973edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // should be initialized with zeroes. 37983edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned CountInits = 0, CountElts = 0; 37993edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman while (CountElts < NumElements) { 38003edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman // Handle nested vector initialization. 38013edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits 38023edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman && E->getInit(CountInits)->getType()->isExtVectorType()) { 38033edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman APValue v; 38043edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateVector(E->getInit(CountInits), v, Info)) 38053edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38063edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman unsigned vlen = v.getVectorLength(); 38073edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman for (unsigned j = 0; j < vlen; j++) 38083edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(v.getVectorElt(j)); 38093edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts += vlen; 38103edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else if (EltTy->isIntegerType()) { 381159b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APSInt sInt(32); 38123edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 38133edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) 38143edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38153edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing integer zero. 38163edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman sInt = Info.Ctx.MakeIntValue(0, EltTy); 38173edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(sInt)); 38183edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 381959b5da6d853b4368b984700315adf7b37de05764Nate Begeman } else { 382059b5da6d853b4368b984700315adf7b37de05764Nate Begeman llvm::APFloat f(0.0); 38213edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (CountInits < NumInits) { 38223edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman if (!EvaluateFloat(E->getInit(CountInits), f, Info)) 38233edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman return Error(E); 38243edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman } else // trailing float zero. 38253edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); 38263edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman Elements.push_back(APValue(f)); 38273edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountElts++; 382859b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 38293edd5a99332dd8ec94a545476dc3c9ed50dec78fEli Friedman CountInits++; 383059b5da6d853b4368b984700315adf7b37de05764Nate Begeman } 383107fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 383259b5da6d853b4368b984700315adf7b37de05764Nate Begeman} 383359b5da6d853b4368b984700315adf7b37de05764Nate Begeman 383407fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool 383551201882382fb40c9456a06c7f93d6ddd4a57712Richard SmithVectorExprEvaluator::ZeroInitialization(const Expr *E) { 383607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith const VectorType *VT = E->getType()->getAs<VectorType>(); 383791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman QualType EltTy = VT->getElementType(); 383891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue ZeroElement; 383991110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman if (EltTy->isIntegerType()) 384091110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); 384191110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman else 384291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman ZeroElement = 384391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); 384491110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 38455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); 384607fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smith return Success(Elements, E); 384791110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 384891110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 384907fc657e3077531805b0e2dbf8f8964d48daa38bRichard Smithbool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 38508327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 385151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 385291110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman} 385391110ee24e3475e0a3a38938c7b98439b5cf0b0eEli Friedman 385459b5da6d853b4368b984700315adf7b37de05764Nate Begeman//===----------------------------------------------------------------------===// 3855cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith// Array Evaluation 3856cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 3857cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3858cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithnamespace { 3859cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith class ArrayExprEvaluator 3860cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith : public ExprEvaluatorBase<ArrayExprEvaluator, bool> { 3861180f47959a066795cc0f409433023af448bb0328Richard Smith const LValue &This; 3862cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith APValue &Result; 3863cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith public: 3864cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3865180f47959a066795cc0f409433023af448bb0328Richard Smith ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) 3866180f47959a066795cc0f409433023af448bb0328Richard Smith : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} 3867cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3868cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool Success(const APValue &V, const Expr *E) { 3869f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith assert((V.isArray() || V.isLValue()) && 3870f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith "expected array or string literal"); 3871cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = V; 3872cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return true; 3873cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith } 3874cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 387551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 3876180f47959a066795cc0f409433023af448bb0328Richard Smith const ConstantArrayType *CAT = 3877180f47959a066795cc0f409433023af448bb0328Richard Smith Info.Ctx.getAsConstantArrayType(E->getType()); 3878180f47959a066795cc0f409433023af448bb0328Richard Smith if (!CAT) 3879f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3880180f47959a066795cc0f409433023af448bb0328Richard Smith 3881180f47959a066795cc0f409433023af448bb0328Richard Smith Result = APValue(APValue::UninitArray(), 0, 3882180f47959a066795cc0f409433023af448bb0328Richard Smith CAT->getSize().getZExtValue()); 3883180f47959a066795cc0f409433023af448bb0328Richard Smith if (!Result.hasArrayFiller()) return true; 3884180f47959a066795cc0f409433023af448bb0328Richard Smith 388551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Zero-initialize all elements. 3886180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3887b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3888180f47959a066795cc0f409433023af448bb0328Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 388983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 3890180f47959a066795cc0f409433023af448bb0328Richard Smith } 3891180f47959a066795cc0f409433023af448bb0328Richard Smith 3892cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith bool VisitInitListExpr(const InitListExpr *E); 3893e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith bool VisitCXXConstructExpr(const CXXConstructExpr *E); 3894cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith }; 3895cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} // end anonymous namespace 3896cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3897180f47959a066795cc0f409433023af448bb0328Richard Smithstatic bool EvaluateArray(const Expr *E, const LValue &This, 3898180f47959a066795cc0f409433023af448bb0328Richard Smith APValue &Result, EvalInfo &Info) { 389951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue"); 3900180f47959a066795cc0f409433023af448bb0328Richard Smith return ArrayExprEvaluator(Info, This, Result).Visit(E); 3901cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3902cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3903cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smithbool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 3904cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3905cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith if (!CAT) 3906f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3907cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3908974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] 3909974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith // an appropriately-typed string literal enclosed in braces. 3910ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (E->getNumInits() == 1 && E->getInit(0)->isGLValue() && 3911974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith Info.Ctx.hasSameUnqualifiedType(E->getType(), E->getInit(0)->getType())) { 3912974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith LValue LV; 3913974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith if (!EvaluateLValue(E->getInit(0), LV, Info)) 3914974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith return false; 3915f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith CCValue Val; 3916f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith LV.moveInto(Val); 3917f3908f2ae111b1b12ade2524dda71c669ed6f121Richard Smith return Success(Val, E); 3918974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith } 3919974c5f93d0ce4f0699a6f0a4402f6b367da495e3Richard Smith 3920745f5147e065900267c85a5568785a1991d4838fRichard Smith bool Success = true; 3921745f5147e065900267c85a5568785a1991d4838fRichard Smith 3922cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith Result = APValue(APValue::UninitArray(), E->getNumInits(), 3923cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith CAT->getSize().getZExtValue()); 3924180f47959a066795cc0f409433023af448bb0328Richard Smith LValue Subobject = This; 3925b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 3926180f47959a066795cc0f409433023af448bb0328Richard Smith unsigned Index = 0; 3927cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith for (InitListExpr::const_iterator I = E->begin(), End = E->end(); 3928180f47959a066795cc0f409433023af448bb0328Richard Smith I != End; ++I, ++Index) { 392983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), 393083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Info, Subobject, cast<Expr>(*I)) || 3931745f5147e065900267c85a5568785a1991d4838fRichard Smith !HandleLValueArrayAdjustment(Info, cast<Expr>(*I), Subobject, 3932745f5147e065900267c85a5568785a1991d4838fRichard Smith CAT->getElementType(), 1)) { 3933745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Info.keepEvaluatingAfterFailure()) 3934745f5147e065900267c85a5568785a1991d4838fRichard Smith return false; 3935745f5147e065900267c85a5568785a1991d4838fRichard Smith Success = false; 3936745f5147e065900267c85a5568785a1991d4838fRichard Smith } 3937180f47959a066795cc0f409433023af448bb0328Richard Smith } 3938cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3939745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Result.hasArrayFiller()) return Success; 3940cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith assert(E->hasArrayFiller() && "no array filler for incomplete init list"); 3941180f47959a066795cc0f409433023af448bb0328Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3942180f47959a066795cc0f409433023af448bb0328Richard Smith // but sometimes does: 3943180f47959a066795cc0f409433023af448bb0328Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3944180f47959a066795cc0f409433023af448bb0328Richard Smith // S s[10] = {}; 394583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, 394683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Subobject, E->getArrayFiller()) && Success; 3947cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith} 3948cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith 3949e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smithbool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { 3950e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(E->getType()); 3951e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!CAT) 3952f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 3953e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3954ec789163a42a7be654ac34aadb750b508954d53cRichard Smith bool HadZeroInit = !Result.isUninit(); 3955ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (!HadZeroInit) 3956ec789163a42a7be654ac34aadb750b508954d53cRichard Smith Result = APValue(APValue::UninitArray(), 0, CAT->getSize().getZExtValue()); 3957e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!Result.hasArrayFiller()) 3958e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 3959e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3960e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const CXXConstructorDecl *FD = E->getConstructor(); 39616180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 396251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInit = E->requiresZeroInitialization(); 396351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { 3964ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (HadZeroInit) 3965ec789163a42a7be654ac34aadb750b508954d53cRichard Smith return true; 3966ec789163a42a7be654ac34aadb750b508954d53cRichard Smith 396751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (ZeroInit) { 396851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith LValue Subobject = This; 3969b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 397051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 397183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); 397251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 397351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 39746180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith const CXXRecordDecl *RD = FD->getParent(); 39756180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith if (RD->isUnion()) 39766180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = APValue((FieldDecl*)0); 39776180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith else 39786180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith Result.getArrayFiller() = 39796180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith APValue(APValue::UninitStruct(), RD->getNumBases(), 39806180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith std::distance(RD->field_begin(), RD->field_end())); 39816180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith return true; 39826180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith } 39836180245e9f63d2927b185ec251fb75aba30f1cacRichard Smith 3984e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith const FunctionDecl *Definition = 0; 3985e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith FD->getBody(Definition); 3986e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3987c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition)) 3988c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 3989e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 3990e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // FIXME: The Subobject here isn't necessarily right. This rarely matters, 3991e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // but sometimes does: 3992e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // struct S { constexpr S() : p(&p) {} void *p; }; 3993e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // S s[10]; 3994e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith LValue Subobject = This; 3995b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Subobject.addArray(Info, E, CAT); 399651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 3997ec789163a42a7be654ac34aadb750b508954d53cRichard Smith if (ZeroInit && !HadZeroInit) { 399851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(CAT->getElementType()); 399983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE)) 400051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 400151201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 400251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 4003e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs()); 4004745f5147e065900267c85a5568785a1991d4838fRichard Smith return HandleConstructorCall(E->getExprLoc(), Subobject, Args, 4005e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith cast<CXXConstructorDecl>(Definition), 4006e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith Info, Result.getArrayFiller()); 4007e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith} 4008e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith 4009cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith//===----------------------------------------------------------------------===// 4010f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner// Integer Evaluation 4011c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// 4012c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// As a GNU extension, we support casting pointers to sufficiently-wide integer 4013c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// types and back in constant folding. Integer values are thus represented 4014c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith// either as an integer-valued APValue, or as an lvalue-valued APValue. 4015f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 4016f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4017f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnernamespace { 4018770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass IntExprEvaluator 40198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<IntExprEvaluator, bool> { 402047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &Result; 4021f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattnerpublic: 402247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith IntExprEvaluator(EvalInfo &info, CCValue &result) 40238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 4024f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4025973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool Success(const llvm::APSInt &SI, const Expr *E) { 4026973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(E->getType()->isIntegralOrEnumerationType() && 40272ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 4028973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && 40293f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 4030973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 40313f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 403247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(SI); 40333f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return true; 40343f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 40353f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar 4036131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(const llvm::APInt &I, const Expr *E) { 40372ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 40382ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 403930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && 40403f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar "Invalid evaluation result."); 404147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(APSInt(I)); 4042575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor Result.getInt().setIsUnsigned( 4043575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor E->getType()->isUnsignedIntegerOrEnumerationType()); 4044131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 4045131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4046131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 4047131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar bool Success(uint64_t Value, const Expr *E) { 40482ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor assert(E->getType()->isIntegralOrEnumerationType() && 40492ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor "Invalid evaluation result."); 405047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(Info.Ctx.MakeIntValue(Value, E->getType())); 4051131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return true; 4052131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 4053131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar 40544f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck bool Success(CharUnits Size, const Expr *E) { 40554f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size.getQuantity(), E); 40564f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck } 40574f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck 405847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *E) { 40595930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (V.isLValue() || V.isAddrLabelDiff()) { 4060342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith Result = V; 4061342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith return true; 4062342f1f8b0a402c5a7f8c5055db7f60a7808f1687Richard Smith } 40638cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(V.getInt(), E); 406432fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner } 40651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 406651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { return Success(0, E); } 4067f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 40688cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 40698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 40708cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 4071f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 40724c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitIntegerLiteral(const IntegerLiteral *E) { 4073131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40744c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 40754c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner bool VisitCharacterLiteral(const CharacterLiteral *E) { 4076131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 40774c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner } 4078043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 4079043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool CheckReferencedDecl(const Expr *E, const Decl *D); 4080043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitDeclRefExpr(const DeclRefExpr *E) { 40818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (CheckReferencedDecl(E, E->getDecl())) 40828cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 40838cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40848cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); 4085043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4086043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman bool VisitMemberExpr(const MemberExpr *E) { 4087043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman if (CheckReferencedDecl(E, E->getMemberDecl())) { 4088c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith VisitIgnoredValue(E->getBase()); 4089043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman return true; 4090043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 40918cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 40928cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitMemberExpr(E); 4093043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman } 4094043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedman 40958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCallExpr(const CallExpr *E); 4096b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitBinaryOperator(const BinaryOperator *E); 40978ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor bool VisitOffsetOfExpr(const OffsetOfExpr *E); 4098b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner bool VisitUnaryOperator(const UnaryOperator *E); 4099f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 41008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr* E); 4101f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); 41020518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 41033068d117951a8df54bae9db039b56201ab10962bAnders Carlsson bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { 4104131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(E->getValue(), E); 41053068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 41061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4107f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith // Note, GNU defines __null as an integer, not a pointer. 41083f70456b8adb0405ef2a47d51f9fc2d5937ae8aeAnders Carlsson bool VisitGNUNullExpr(const GNUNullExpr *E) { 410951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return ZeroInitialization(E); 4110664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman } 4111664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 411264b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl bool VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) { 41130dfd848fa4c9664852ba8c929a8bd3fce93ddca2Sebastian Redl return Success(E->getValue(), E); 411464b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl } 411564b45f7e0d3167f040841ac2920aead7f080730dSebastian Redl 41166ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet bool VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) { 41176ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet return Success(E->getValue(), E); 41186ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet } 41196ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet 412021ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { 412121ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley return Success(E->getValue(), E); 412221ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley } 412321ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley 4124552622067dc45013d240f73952fece703f5e63bdJohn Wiegley bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { 4125552622067dc45013d240f73952fece703f5e63bdJohn Wiegley return Success(E->getValue(), E); 4126552622067dc45013d240f73952fece703f5e63bdJohn Wiegley } 4127552622067dc45013d240f73952fece703f5e63bdJohn Wiegley 4128722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman bool VisitUnaryReal(const UnaryOperator *E); 4129664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman bool VisitUnaryImag(const UnaryOperator *E); 4130664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 4131295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); 4132ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); 4133cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 4134fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattnerprivate: 41358b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfExpr(const Expr *E); 41368b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck CharUnits GetAlignOfType(QualType T); 41371bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith static QualType GetObjectType(APValue::LValueBase B); 41388cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool TryEvaluateBuiltinObjectSize(const CallExpr *E); 4139664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman // FIXME: Missing: array subscript of vector, member of vector 4140f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner}; 4141f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} // end anonymous namespace 4142f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4143c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and 4144c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// produce either the integer value or a pointer. 4145c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// 4146c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// GCC has a heinous extension which folds casts between pointer types and 4147c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// pointer-sized integral types. We support this by allowing the evaluation of 4148c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// an integer rvalue to produce a pointer (represented as an lvalue) instead. 4149c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// Some simple arithmetic on such values is supported (they are treated much 4150c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// like char*). 4151f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateIntegerOrLValue(const Expr *E, CCValue &Result, 415247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith EvalInfo &Info) { 4153c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType()); 41548cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return IntExprEvaluator(Info, Result).Visit(E); 415569ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar} 415669ab26a8623141f35e86817cfc6e0fbe7639a40fDaniel Dunbar 4157f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { 415847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue Val; 4159f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateIntegerOrLValue(E, Val, Info)) 4160f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4161f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Val.isInt()) { 4162f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // FIXME: It would be better to produce the diagnostic for casting 4163f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // a pointer to an integer. 4164dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 416530c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4166f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 416730c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar Result = Val.getInt(); 416830c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return true; 4169f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner} 4170f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4171f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Check whether the given declaration can be directly converted to an integral 4172f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// rvalue. If not, no diagnostic is produced; there are other things we can 4173f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// try. 4174043097507f99b1156bfd8bad41e7d5166ae4b9b6Eli Friedmanbool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { 41754c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // Enums are integer constant exprs. 4176bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { 4177973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Check for signedness/width mismatches between E type and ECD value. 4178973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameSign = (ECD->getInitVal().isSigned() 4179973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == E->getType()->isSignedIntegerOrEnumerationType()); 4180973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara bool SameWidth = (ECD->getInitVal().getBitWidth() 4181973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara == Info.Ctx.getIntWidth(E->getType())); 4182973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (SameSign && SameWidth) 4183973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(ECD->getInitVal(), E); 4184973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara else { 4185973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // Get rid of mismatch (otherwise Success assertions will fail) 4186973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara // by computing a new value matching the type of E. 4187973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara llvm::APSInt Val = ECD->getInitVal(); 4188973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameSign) 4189973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val.setIsSigned(!ECD->getInitVal().isSigned()); 4190973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara if (!SameWidth) 4191973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); 4192973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara return Success(Val, E); 4193973c4fc0b0a88f9cea273b16f2082788a6e57d74Abramo Bagnara } 4194bfbdcd861a4364bfc21a9e5047bdbd56812d6693Abramo Bagnara } 41958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return false; 41964c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 41974c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner 4198a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way 4199a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner/// as GCC. 4200a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattnerstatic int EvaluateBuiltinClassifyType(const CallExpr *E) { 4201a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // The following enum mimics the values returned by GCC. 42027c80bd64032e610c0dbd74fc0ef6ea334447f2fdSebastian Redl // FIXME: Does GCC differ between lvalue and rvalue references here? 4203a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enum gcc_type_class { 4204a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner no_type_class = -1, 4205a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner void_type_class, integer_type_class, char_type_class, 4206a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner enumeral_type_class, boolean_type_class, 4207a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner pointer_type_class, reference_type_class, offset_type_class, 4208a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner real_type_class, complex_type_class, 4209a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner function_type_class, method_type_class, 4210a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner record_type_class, union_type_class, 4211a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner array_type_class, string_type_class, 4212a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner lang_type_class 4213a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner }; 42141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 42151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If no argument was supplied, default to "no_type_class". This isn't 4216a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner // ideal, however it is what gcc does. 4217a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (E->getNumArgs() == 0) 4218a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return no_type_class; 42191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4220a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner QualType ArgTy = E->getArg(0)->getType(); 4221a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner if (ArgTy->isVoidType()) 4222a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return void_type_class; 4223a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isEnumeralType()) 4224a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return enumeral_type_class; 4225a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isBooleanType()) 4226a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return boolean_type_class; 4227a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isCharType()) 4228a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return string_type_class; // gcc doesn't appear to use char_type_class 4229a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isIntegerType()) 4230a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return integer_type_class; 4231a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isPointerType()) 4232a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return pointer_type_class; 4233a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isReferenceType()) 4234a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return reference_type_class; 4235a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isRealType()) 4236a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return real_type_class; 4237a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isComplexType()) 4238a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return complex_type_class; 4239a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isFunctionType()) 4240a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return function_type_class; 4241fb87b89fc9eb103e19fb8e4b925c23f0bd091b99Douglas Gregor else if (ArgTy->isStructureOrClassType()) 4242a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return record_type_class; 4243a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4244a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4245a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isArrayType()) 4246a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return array_type_class; 4247a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else if (ArgTy->isUnionType()) 4248a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner return union_type_class; 4249a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner else // FIXME: offset_type_class, method_type_class, & lang_type_class? 4250b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("CallExpr::isBuiltinClassifyType(): unimplemented type"); 4251a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner} 4252a4d55d89c8076b402bb168e3edeef0c2cd2a78c3Chris Lattner 425380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantPForLValue - Determine the result of 425480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// __builtin_constant_p when applied to the given lvalue. 425580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// 425680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// An lvalue is only "constant" if it is a pointer or reference to the first 425780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// character of a string literal. 425880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithtemplate<typename LValue> 425980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantPForLValue(const LValue &LV) { 426080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith const Expr *E = LV.getLValueBase().dyn_cast<const Expr*>(); 426180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return E && isa<StringLiteral>(E) && LV.getLValueOffset().isZero(); 426280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 426380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 426480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to 426580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith/// GCC as we can manage. 426680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithstatic bool EvaluateBuiltinConstantP(ASTContext &Ctx, const Expr *Arg) { 426780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith QualType ArgType = Arg->getType(); 426880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 426980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // __builtin_constant_p always has one operand. The rules which gcc follows 427080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // are not precisely documented, but are as follows: 427180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 427280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand is of integral, floating, complex or enumeration type, 427380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // and can be folded to a known value of that type, it returns 1. 427480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // - If the operand and can be folded to a pointer to the first character 427580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // of a string literal (or such a pointer cast to an integral type), it 427680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // returns 1. 427780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 427880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Otherwise, it returns 0. 427980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // 428080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // FIXME: GCC also intends to return 1 for literals of aggregate types, but 428180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // its support for this does not currently work. 428280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (ArgType->isIntegralOrEnumerationType()) { 428380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalResult Result; 428480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!Arg->EvaluateAsRValue(Result, Ctx) || Result.HasSideEffects) 428580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 428680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 428780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith APValue &V = Result.Val; 428880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (V.getKind() == APValue::Int) 428980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return true; 429080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 429180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(V); 429280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isFloatingType() || ArgType->isAnyComplexType()) { 429380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Arg->isEvaluatable(Ctx); 429480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } else if (ArgType->isPointerType() || Arg->isGLValue()) { 429580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith LValue LV; 429680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith Expr::EvalStatus Status; 429780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith EvalInfo Info(Ctx, Status); 429880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if ((Arg->isGLValue() ? EvaluateLValue(Arg, LV, Info) 429980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith : EvaluatePointer(Arg, LV, Info)) && 430080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith !Status.HasSideEffects) 430180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return EvaluateBuiltinConstantPForLValue(LV); 430280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith } 430380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 430480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith // Anything else isn't considered to be sufficiently constant. 430580d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 430680d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith} 430780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 430842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// Retrieves the "underlying object type" of the given expression, 430942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall/// as used by __builtin_object_size. 43101bf9a9e6a5bdc0de7939908855dcddf46b661800Richard SmithQualType IntExprEvaluator::GetObjectType(APValue::LValueBase B) { 43111bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { 43121bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 431342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return VD->getType(); 43141bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith } else if (const Expr *E = B.get<const Expr*>()) { 43151bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (isa<CompoundLiteralExpr>(E)) 43161bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith return E->getType(); 431742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall } 431842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 431942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return QualType(); 432042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 432142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43228cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::TryEvaluateBuiltinObjectSize(const CallExpr *E) { 432342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // TODO: Perhaps we should let LLVM lower this? 432442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall LValue Base; 432542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!EvaluatePointer(E->getArg(0), Base, Info)) 432642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return false; 432742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 432842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall // If we can prove the base is null, lower to zero now. 43291bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (!Base.getLValueBase()) return Success(0, E); 433042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43311bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith QualType T = GetObjectType(Base.getLValueBase()); 433242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (T.isNull() || 433342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isIncompleteType() || 43341357869bc5983cdfbc986db1f3d18265bb34cb0eEli Friedman T->isFunctionType() || 433542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isVariablyModifiedType() || 433642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall T->isDependentType()) 4337f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 433842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 433942c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Size = Info.Ctx.getTypeSizeInChars(T); 434042c8f87eb60958170c46767273bf93e6c96125bfJohn McCall CharUnits Offset = Base.getLValueOffset(); 434142c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 434242c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (!Offset.isNegative() && Offset <= Size) 434342c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size -= Offset; 434442c8f87eb60958170c46767273bf93e6c96125bfJohn McCall else 434542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall Size = CharUnits::Zero(); 43464f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(Size, E); 434742c8f87eb60958170c46767273bf93e6c96125bfJohn McCall} 434842c8f87eb60958170c46767273bf93e6c96125bfJohn McCall 43498cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { 4350180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 4351019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner default: 43528cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 435364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 435464eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump case Builtin::BI__builtin_object_size: { 435542c8f87eb60958170c46767273bf93e6c96125bfJohn McCall if (TryEvaluateBuiltinObjectSize(E)) 435642c8f87eb60958170c46767273bf93e6c96125bfJohn McCall return true; 435764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4358b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // If evaluating the argument has side-effects we can't determine 4359b2aaf51ed73a4774322a39a0dd59d0fe7e3258c0Eric Christopher // the size of the object and lower it to unknown now. 4360393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian if (E->getArg(0)->HasSideEffects(Info.Ctx)) { 4361a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue() <= 1) 4362cf184655319cf7a5b811067cff9d26a5741fd161Chris Lattner return Success(-1ULL, E); 436364eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump return Success(0, E); 436464eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 4365c4c9045dabfc0f0d37dea1b3eb2992654d5b2db1Mike Stump 4366f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 436764eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump } 436864eda9e50b593f935c95bd1edc98c4bfda03f601Mike Stump 4369019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_classify_type: 4370131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(EvaluateBuiltinClassifyType(E), E); 43711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 437280d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith case Builtin::BI__builtin_constant_p: 437380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return Success(EvaluateBuiltinConstantP(Info.Ctx, E->getArg(0)), E); 4374e052d46f4db91f9ba572859ffc984e85cbf5d5ffRichard Smith 437521fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner case Builtin::BI__builtin_eh_return_data_regno: { 4376a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); 4377bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); 437821fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner return Success(Operand, E); 437921fb98ee003e992b0c4e204d98a19e0ef544cae3Chris Lattner } 4380c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman 4381c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman case Builtin::BI__builtin_expect: 4382c4a2638b5ef3e2d35d872614ceb655a7a22c58beEli Friedman return Visit(E->getArg(0)); 438340b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith 43845726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BIstrlen: 438540b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // A call to strlen is not a constant expression. 438640b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith if (Info.getLangOpts().CPlusPlus0x) 438740b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_invalid_function) 438840b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith << /*isConstexpr*/0 << /*isConstructor*/0 << "'strlen'"; 438940b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith else 439040b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 439140b993a826728214c869ee4fbc9d296a2e1e1f71Richard Smith // Fall through. 43925726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor case Builtin::BI__builtin_strlen: 43935726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // As an extension, we support strlen() and __builtin_strlen() as constant 43945726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // expressions when the argument is a string literal. 43958cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne if (const StringLiteral *S 43965726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor = dyn_cast<StringLiteral>(E->getArg(0)->IgnoreParenImpCasts())) { 43975726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // The string literal may have embedded null characters. Find the first 43985726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor // one and truncate there. 43995f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef Str = S->getString(); 44005f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner StringRef::size_type Pos = Str.find(0); 44015f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Pos != StringRef::npos) 44025726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor Str = Str.substr(0, Pos); 44035726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 44045726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor return Success(Str.size(), E); 44055726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor } 44065726d405e71f11feaaf0c8f518abe26e909537a4Douglas Gregor 4407f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4408454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4409454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman case Builtin::BI__atomic_is_lock_free: { 4410454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman APSInt SizeVal; 4411454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) 4412454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return false; 4413454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4414454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power 4415454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // of two less than the maximum inline atomic width, we know it is 4416454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // lock-free. If the size isn't a power of two, or greater than the 4417454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // maximum alignment where we promote atomics, we know it is not lock-free 4418454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // (at least not in the sense of atomic_is_lock_free). Otherwise, 4419454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // the answer can only be determined at runtime; for example, 16-byte 4420454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // atomics have lock-free implementations on some, but not all, 4421454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // x86-64 processors. 4422454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4423454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check power-of-two. 4424454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); 4425454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (!Size.isPowerOfTwo()) 4426454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4427454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4428454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4429454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4430454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#else 4431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4432454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4433454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4434454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#if 0 4435454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against promotion width. 4436454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // FIXME: Suppress this folding until the ABI for the promotion width 4437454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // settles. 4438454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned PromoteWidthBits = 4439454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicPromoteWidth(); 4440454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size > Info.Ctx.toCharUnitsFromBits(PromoteWidthBits)) 4441454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(0, E); 4442454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman#endif 4443454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4444454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman // Check against inlining width. 4445454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman unsigned InlineWidthBits = 4446454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); 4447454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) 4448454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman return Success(1, E); 4449454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman 4450f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4451454b57ac42c9ce0bed9b7a99c2ed5a18fbcd286bEli Friedman } 4452019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 44534c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner} 4454f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 4455625b80755b603d28f36fb4212c81484d87ad08d3Richard Smithstatic bool HasSameBase(const LValue &A, const LValue &B) { 4456625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!A.getLValueBase()) 4457625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return !B.getLValueBase(); 4458625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!B.getLValueBase()) 4459625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4460625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44611bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith if (A.getLValueBase().getOpaqueValue() != 44621bf9a9e6a5bdc0de7939908855dcddf46b661800Richard Smith B.getLValueBase().getOpaqueValue()) { 4463625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *ADecl = GetLValueBaseDecl(A); 4464625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!ADecl) 4465625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4466625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith const Decl *BDecl = GetLValueBaseDecl(B); 44679a17a680c74ef661bf3d864029adf7e74d9cb5b8Richard Smith if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) 4468625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return false; 4469625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith } 4470625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 4471625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith return IsGlobalLValue(A.getLValueBase()) || 447283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith A.getLValueCallIndex() == B.getLValueCallIndex(); 4473625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith} 4474625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 44757b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// Perform the given integer operation, which is known to need at most BitWidth 44767b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// bits, and check for overflow in the original type (if that type was not an 44777b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith/// unsigned type). 44787b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithtemplate<typename Operation> 44797b48a2986345480241f3b8209f71bb21b0530b4fRichard Smithstatic APSInt CheckedIntArithmetic(EvalInfo &Info, const Expr *E, 44807b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith const APSInt &LHS, const APSInt &RHS, 44817b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith unsigned BitWidth, Operation Op) { 44827b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (LHS.isUnsigned()) 44837b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Op(LHS, RHS); 44847b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 44857b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); 44867b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith APSInt Result = Value.trunc(LHS.getBitWidth()); 44877b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.extend(BitWidth) != Value) 44887b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith HandleOverflow(Info, E, Value, E->getType()); 44897b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Result; 44907b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith} 44917b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 4492b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 4493c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAssignmentOp()) 4494f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4495c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 44962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Comma) { 44978327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getLHS()); 44988327fad71da34492d82c532f42a58cb4baff81a3Richard Smith return Visit(E->getRHS()); 4499a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4500a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4501a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman if (E->isLogicalOp()) { 4502a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // These need to be handled specially because the operands aren't 450374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // necessarily integral nor evaluated. 4504fcb4d09531abbf2a5cf398c2f946fb3bc2875f64Anders Carlsson bool lhsResult, rhsResult; 45051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4506c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) { 450751fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // We were able to evaluate the LHS, see if we can get away with not 450851fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 45092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (lhsResult == (E->getOpcode() == BO_LOr)) 45103f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar return Success(lhsResult, E); 4511a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4512c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 45132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_LOr) 4514131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult || rhsResult, E); 45154bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson else 4516131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(lhsResult && rhsResult, E); 45174bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 45184bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } else { 451974e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Since we weren't able to evaluate the left hand side, it 452074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // must have had side effects. 452174e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith Info.EvalStatus.HasSideEffects = true; 452274e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith 452374e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith // Suppress diagnostics from this arm. 452474e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith SpeculativeEvaluationRAII Speculative(Info); 4525c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) { 45264bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // We can't evaluate the LHS; however, sometimes the result 45274bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. 452874e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (rhsResult == (E->getOpcode() == BO_LOr)) 4529131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(rhsResult, E); 45304bbc0e05a714d4ee4918a92a4a7049dd6ef33ad0Anders Carlsson } 4531a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4532a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4533a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman return false; 4534c8cc9ccc7b87a7ed1749b074f6b670bcec49abc1Chris Lattner } 453554176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner 4536286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType LHSTy = E->getLHS()->getType(); 4537286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson QualType RHSTy = E->getRHS()->getType(); 45384087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45394087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHSTy->isAnyComplexType()) { 45404087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar assert(RHSTy->isAnyComplexType() && "Invalid comparison"); 4541f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS, RHS; 45424087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4543745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); 4544745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 45454087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45464087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 4547745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 45484087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar return false; 45494087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45504087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar if (LHS.isComplexFloat()) { 45511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_r = 45524087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); 45531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump APFloat::cmpResult CR_i = 45544087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); 45554087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar 45562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4557131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((CR_r == APFloat::cmpEqual && 4558131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar CR_i == APFloat::cmpEqual), E); 4559131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45602de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4561131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid complex comparison."); 45621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(((CR_r == APFloat::cmpGreaterThan || 4563fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpLessThan || 4564fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_r == APFloat::cmpUnordered) || 45651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (CR_i == APFloat::cmpGreaterThan || 4566fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpLessThan || 4567fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang CR_i == APFloat::cmpUnordered)), E); 4568131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45694087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } else { 45702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_EQ) 4571131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() == RHS.getComplexIntReal() && 4572131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() == RHS.getComplexIntImag()), E); 4573131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar else { 45742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall assert(E->getOpcode() == BO_NE && 4575131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar "Invalid compex comparison."); 4576131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success((LHS.getComplexIntReal() != RHS.getComplexIntReal() || 4577131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar LHS.getComplexIntImag() != RHS.getComplexIntImag()), E); 4578131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar } 45794087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45804087e24f73d05d96ac2d259679751d054d3ddfbcDaniel Dunbar } 45811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4582286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson if (LHSTy->isRealFloatingType() && 4583286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson RHSTy->isRealFloatingType()) { 4584286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat RHS(0.0), LHS(0.0); 45851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4586745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); 4587745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4588286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4590745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) 4591286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson return false; 45921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4593286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson APFloat::cmpResult CR = LHS.compare(RHS); 4594529569e68d10b0fd3750fd2124faf742249b846bAnders Carlsson 4595286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson switch (E->getOpcode()) { 4596286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson default: 4597b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Invalid binary operator!"); 45982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 4599131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan, E); 46002de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 4601131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpGreaterThan, E); 46022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 4603131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpLessThan || CR == APFloat::cmpEqual, E); 46042de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 46051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan || CR == APFloat::cmpEqual, 4606131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar E); 46072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 4608131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(CR == APFloat::cmpEqual, E); 46092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 46101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Success(CR == APFloat::cmpGreaterThan 4611fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpLessThan 4612fc39dc4c7886723310419b1869cf651ca55b7af4Mon P Wang || CR == APFloat::cmpUnordered, E); 4613286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 4614286f85e791dda3634fee7f6c67f0ed92296c028fAnders Carlsson } 46151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4616ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 4617625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (E->getOpcode() == BO_Sub || E->isComparisonOp()) { 4618745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue LHSValue, RHSValue; 4619745f5147e065900267c85a5568785a1991d4838fRichard Smith 4620745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); 4621745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 46223068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4623a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4624745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) 46253068d117951a8df54bae9db039b56201ab10962bAnders Carlsson return false; 4626a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 4627625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // Reject differing bases from the normal codepath; we special-case 4628625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith // comparisons to null. 4629625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith if (!HasSameBase(LHSValue, RHSValue)) { 463065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub) { 463165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle &&A - &&B. 463265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) 463365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 463465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 463565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = LHSValue.Base.dyn_cast<const Expr*>(); 463665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 463765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 463865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 463965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 464065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 464165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 46425930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 46435930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 46445930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 46455930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 464665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 464765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 464865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 46499e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Inequalities and subtractions between unrelated pointers have 46509e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // unspecified or undefined behavior. 46515bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman if (!E->isEqualityOp()) 4652f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4653ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // A constant address may compare equal to the address of a symbol. 4654ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman // The one exception is that address of an object cannot compare equal 4655c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // to a null pointer constant. 4656ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || 4657ffbda40a1fb7169591dc01771f3511178a2f727cEli Friedman (!RHSValue.Base && !RHSValue.Offset.isZero())) 4658f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46599e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // It's implementation-defined whether distinct literals will have 4660b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // distinct addresses. In clang, the result of such a comparison is 4661b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // unspecified, so it is not a constant expression. However, we do know 4662b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // that the address of a literal will be non-null. 466374f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && 466474f4634781cee06e28eb741bda5d0f936fdd1948Richard Smith LHSValue.Base && RHSValue.Base) 4665f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46669e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // We can't tell whether weak symbols will end up pointing to the same 46679e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // object. 46689e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) 4669f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 46709e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith // Pointers with different bases cannot represent the same object. 4671c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // (Note that clang defaults to -fmerge-all-constants, which can 4672c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // lead to inconsistent results for comparisons involving the address 4673c45061bd0c0fdad4df8eea7e9e5af186d11427e5Eli Friedman // of a constant; this generally doesn't matter in practice.) 46749e36b533af1b2fa9f32c4372c4081abdd86f47e0Richard Smith return Success(E->getOpcode() == BO_NE, E); 46755bc86103767c2abcbfdd6518e0ccbbbb6aa59e0fEli Friedman } 4676a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 467715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &LHSOffset = LHSValue.getLValueOffset(); 467815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith const CharUnits &RHSOffset = RHSValue.getLValueOffset(); 467915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 4680f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); 4681f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); 4682f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Sub) { 4684f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.add]p6: 4685f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Unless both pointers point to elements of the same array object, or 4686f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // one past the last element of the array object, the behavior is 4687f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // undefined. 4688f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4689f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith !AreElementsOfSameArray(getType(LHSValue.Base), 4690f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LHSDesignator, RHSDesignator)) 4691f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); 4692f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 46934992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType Type = E->getLHS()->getType(); 46944992bdde387c5f033bb450a716eaabc0fda52688Chris Lattner QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); 46953068d117951a8df54bae9db039b56201ab10962bAnders Carlsson 4696180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits ElementSize; 469774e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) 4698180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 4699a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 470015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, 470115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and produce incorrect results when it overflows. Such behavior 470215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // appears to be non-conforming, but is common, so perhaps we should 470315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // assume the standard intended for such cases to be undefined behavior 470415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // and check for them. 470515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 470615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // Compute (LHSOffset - RHSOffset) / Size carefully, checking for 470715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith // overflow in the final conversion to ptrdiff_t. 470815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt LHS( 470915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); 471015efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt RHS( 471115efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); 471215efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt ElemSize( 471315efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), false); 471415efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt TrueResult = (LHS - RHS) / ElemSize; 471515efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); 471615efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith 471715efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith if (Result.extend(65) != TrueResult) 471815efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith HandleOverflow(Info, E, TrueResult, E->getType()); 471915efc4d597a47e6ba5794d4fd8d561bf6947233cRichard Smith return Success(Result, E); 4720ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 4721625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith 472282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // C++11 [expr.rel]p3: 472382f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // Pointers to void (after pointer conversions) can be compared, with a 472482f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // result defined as follows: If both pointers represent the same 472582f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // address or are both the null pointer value, the result is true if the 472682f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // operator is <= or >= and false otherwise; otherwise the result is 472782f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // unspecified. 472882f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith // We interpret this as applying to pointers to *cv* void. 472982f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && 4730f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) 473182f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith CCEDiag(E, diag::note_constexpr_void_comparison); 473282f28583b8e81ae9b61635a0652f6a45623df16dRichard Smith 4733f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // C++11 [expr.rel]p2: 4734f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - If two pointers point to non-static data members of the same object, 4735f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // or to subobjects or array elements fo such members, recursively, the 4736f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // pointer to the later declared member compares greater provided the 4737f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // two members have the same access control and provided their class is 4738f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // not a union. 4739f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // [...] 4740f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - Otherwise pointer comparisons are unspecified. 4741f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && 4742f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith E->isRelationalOp()) { 4743f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith bool WasArrayIndex; 4744f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith unsigned Mismatch = 4745f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith FindDesignatorMismatch(getType(LHSValue.Base), LHSDesignator, 4746f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith RHSDesignator, WasArrayIndex); 4747f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // At the point where the designators diverge, the comparison has a 4748f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // specified value if: 4749f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing array indices 4750f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // - we are comparing fields of a union, or fields with the same access 4751f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // Otherwise, the result is unspecified and thus the comparison is not a 4752f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith // constant expression. 4753f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && 4754f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith Mismatch < RHSDesignator.Entries.size()) { 4755f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); 4756f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); 4757f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith if (!LF && !RF) 4758f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); 4759f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF) 4760f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4761f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(LHSDesignator.Entries[Mismatch]) 4762f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << RF->getParent() << RF; 4763f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!RF) 4764f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) 4765f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << getAsBaseClass(RHSDesignator.Entries[Mismatch]) 4766f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent() << LF; 4767f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith else if (!LF->getParent()->isUnion() && 4768f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith LF->getAccess() != RF->getAccess()) 4769f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith CCEDiag(E, diag::note_constexpr_pointer_comparison_differing_access) 4770f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF << LF->getAccess() << RF << RF->getAccess() 4771f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith << LF->getParent(); 4772f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4773f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith } 4774f15fda02e9c8c82b4a716618f4010b9af8bff796Richard Smith 4775625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith switch (E->getOpcode()) { 4776625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith default: llvm_unreachable("missing comparison operator"); 4777625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LT: return Success(LHSOffset < RHSOffset, E); 4778625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GT: return Success(LHSOffset > RHSOffset, E); 4779625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_LE: return Success(LHSOffset <= RHSOffset, E); 4780625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_GE: return Success(LHSOffset >= RHSOffset, E); 4781625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_EQ: return Success(LHSOffset == RHSOffset, E); 4782625b80755b603d28f36fb4212c81484d87ad08d3Richard Smith case BO_NE: return Success(LHSOffset != RHSOffset, E); 4783ad02d7debd03ff275ac8ea27891a4ecccdb78068Eli Friedman } 47843068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 47853068d117951a8df54bae9db039b56201ab10962bAnders Carlsson } 4786b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4787b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (LHSTy->isMemberPointerType()) { 4788b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(E->isEqualityOp() && "unexpected member pointer operation"); 4789b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith assert(RHSTy->isMemberPointerType() && "invalid comparison"); 4790b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4791b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith MemberPtr LHSValue, RHSValue; 4792b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4793b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); 4794b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSOK && Info.keepEvaluatingAfterFailure()) 4795b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4796b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4797b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) 4798b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return false; 4799b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4800b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // C++11 [expr.eq]p2: 4801b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // If both operands are null, they compare equal. Otherwise if only one is 4802b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // null, they compare unequal. 4803b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (!LHSValue.getDecl() || !RHSValue.getDecl()) { 4804b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); 4805b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4806b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4807b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4808b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise if either is a pointer to a virtual member function, the 4809b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // result is unspecified. 4810b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) 4811b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4812b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4813b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) 4814b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith if (MD->isVirtual()) 4815b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; 4816b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 4817b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // Otherwise they compare equal if and only if they would refer to the 4818b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // same member of the same most derived object or the same subobject if 4819b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // they were dereferenced with a hypothetical object of the associated 4820b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith // class type. 4821b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith bool Equal = LHSValue == RHSValue; 4822b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith return Success(E->getOpcode() == BO_EQ ? Equal : !Equal, E); 4823b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith } 4824b02e4629f78a0c0c0adf9d66b644e5932a781c7eRichard Smith 482526f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith if (LHSTy->isNullPtrType()) { 482626f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(E->isComparisonOp() && "unexpected nullptr operation"); 482726f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith assert(RHSTy->isNullPtrType() && "missing pointer conversion"); 482826f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t 482926f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // are compared, the result is true of the operator is <=, >= or ==, and 483026f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith // false otherwise. 483126f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith BinaryOperator::Opcode Opcode = E->getOpcode(); 483226f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith return Success(Opcode == BO_EQ || Opcode == BO_LE || Opcode == BO_GE, E); 483326f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith } 483426f2cac83eeb4317738d74b9e567d3d58aa04ed9Richard Smith 48352ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!LHSTy->isIntegralOrEnumerationType() || 48362ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor !RHSTy->isIntegralOrEnumerationType()) { 4837e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith // We can't continue from here for non-integral types. 4838e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 4839a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman } 4840a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4841a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman // The LHS of a constant expr is always evaluated and needed. 484247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue LHSVal; 4843745f5147e065900267c85a5568785a1991d4838fRichard Smith 4844745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info); 4845745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 4846f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 4847d9f4bcda18bfbf79341edd9d381d4b6a3cffe655Eli Friedman 4848745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!Visit(E->getRHS()) || !LHSOK) 484930c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar return false; 4850745f5147e065900267c85a5568785a1991d4838fRichard Smith 485147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith CCValue &RHSVal = Result; 485242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 485342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like (unsigned long)&a + 4. 4854c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { 4855a73058324197b7bdfd19307965954f626e26199dKen Dyck CharUnits AdditionalOffset = CharUnits::fromQuantity( 4856a73058324197b7bdfd19307965954f626e26199dKen Dyck RHSVal.getInt().getZExtValue()); 48572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add) 485847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() += AdditionalOffset; 485942edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman else 486047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getLValueOffset() -= AdditionalOffset; 486147a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = LHSVal; 486242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 486342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 486442edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 486542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // Handle cases like 4 + (unsigned long)&a 48662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_Add && 4867c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith RHSVal.isLValue() && LHSVal.isInt()) { 486847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith RHSVal.getLValueOffset() += CharUnits::fromQuantity( 486947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith LHSVal.getInt().getZExtValue()); 487047a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith // Note that RHSVal is Result. 487142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman return true; 487242edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman } 487342edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 487465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { 487565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Handle (intptr_t)&&A - (intptr_t)&&B. 487665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSVal.getLValueOffset().isZero() || 487765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman !RHSVal.getLValueOffset().isZero()) 487865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 487965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); 488065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); 488165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSExpr || !RHSExpr) 488265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 488365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); 488465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); 488565639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (!LHSAddrExpr || !RHSAddrExpr) 488665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return false; 48875930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman // Make sure both labels come from the same function. 48885930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman if (LHSAddrExpr->getLabel()->getDeclContext() != 48895930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman RHSAddrExpr->getLabel()->getDeclContext()) 48905930a4c5224eea3b0558655f7f8c9ea027ef573eEli Friedman return false; 489165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman Result = CCValue(LHSAddrExpr, RHSAddrExpr); 489265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return true; 489365639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman } 489465639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman 489542edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman // All the following cases expect both operands to be an integer 4896c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!LHSVal.isInt() || !RHSVal.isInt()) 4897f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 4898a6afa768aa7bd3102a2807aa720917e4a1771e4eEli Friedman 4899c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &LHS = LHSVal.getInt(); 4900c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith APSInt &RHS = RHSVal.getInt(); 490142edd0d32a729d2735a6fb152ba6bf349bf0a169Eli Friedman 4902a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson switch (E->getOpcode()) { 490332fea9d18cc3658a1b01df5ca6f2ac302625c61dChris Lattner default: 4904f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 49057b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Mul: 49067b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49077b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() * 2, 49087b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::multiplies<APSInt>()), E); 49097b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Add: 49107b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49117b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 49127b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::plus<APSInt>()), E); 49137b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith case BO_Sub: 49147b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return Success(CheckedIntArithmetic(Info, E, LHS, RHS, 49157b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith LHS.getBitWidth() + 1, 49167b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith std::minus<APSInt>()), E); 4917c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_And: return Success(LHS & RHS, E); 4918c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Xor: return Success(LHS ^ RHS, E); 4919c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_Or: return Success(LHS | RHS, E); 49202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 49213df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith case BO_Rem: 492254176fdb044312b4b77c3da6682d3575b3728d30Chris Lattner if (RHS == 0) 4923f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 49243df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. The latter is not 49253df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith // actually undefined behavior in C++11 due to a language defect. 4926789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (RHS.isNegative() && RHS.isAllOnesValue() && 4927789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith LHS.isSigned() && LHS.isMinSignedValue()) 4928789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), E->getType()); 49293df61308ddfbdba0897b762a129b5a38750c87d0Richard Smith return Success(E->getOpcode() == BO_Rem ? LHS % RHS : LHS / RHS, E); 49302de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: { 4931789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4932789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4933091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4934789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4935091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4936091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_right; 4937091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4938091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4939091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_left: 4940789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4941789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4942789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4943789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) { 4944789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4945789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4946789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } else if (LHS.isSigned()) { 4947789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p2: A signed left shift must have a non-negative 4948925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith // operand, and must not overflow the corresponding unsigned type. 4949789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (LHS.isNegative()) 4950789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; 4951925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith else if (LHS.countLeadingZeros() < SA) 4952925d8e7c0f18e03dc4bc634b3c6c1ec09373d993Richard Smith CCEDiag(E, diag::note_constexpr_lshift_discards); 4953789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith } 4954789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4955c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS << SA, E); 49563f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: { 4958789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // During constant-folding, a negative shift is an opposite shift. Such a 4959789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shift is not a constant expression. 4960091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall if (RHS.isSigned() && RHS.isNegative()) { 4961789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; 4962091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall RHS = -RHS; 4963091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall goto shift_left; 4964091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall } 4965091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall 4966091f23f1d6d4bcffd6641cda72a6831e08c02ea7John McCall shift_right: 4967789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // C++11 [expr.shift]p1: Shift width must be less than the bit width of the 4968789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith // shifted type. 4969789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); 4970789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (SA != RHS) 4971789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith CCEDiag(E, diag::note_constexpr_large_shift) 4972789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith << RHS << E->getType() << LHS.getBitWidth(); 4973789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith 4974c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return Success(LHS >> SA, E); 49753f7d995390009fede92b333a040da80e1ce90997Daniel Dunbar } 49761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4977c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LT: return Success(LHS < RHS, E); 4978c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GT: return Success(LHS > RHS, E); 4979c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_LE: return Success(LHS <= RHS, E); 4980c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_GE: return Success(LHS >= RHS, E); 4981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_EQ: return Success(LHS == RHS, E); 4982c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith case BO_NE: return Success(LHS != RHS, E); 4983b11e77836dd0867955c5abf32baf1c3e6c7f81e1Eli Friedman } 4984a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 4985a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson 49868b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfType(QualType T) { 49875d484e8cf710207010720589d89602233de61d01Sebastian Redl // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the 49885d484e8cf710207010720589d89602233de61d01Sebastian Redl // result shall be the alignment of the referenced type." 49895d484e8cf710207010720589d89602233de61d01Sebastian Redl if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 49905d484e8cf710207010720589d89602233de61d01Sebastian Redl T = Ref->getPointeeType(); 49919f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier 49929f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier // __alignof is defined to return the preferred alignment. 49939f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier return Info.Ctx.toCharUnitsFromBits( 49949f1210c3280104417a4ad30f0a00825ac8fa718aChad Rosier Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); 4995e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 4996e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 49978b752f10c394b140f9ef89e049cbad1a7676fc25Ken DyckCharUnits IntExprEvaluator::GetAlignOfExpr(const Expr *E) { 4998af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner E = E->IgnoreParens(); 4999af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5000af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner // alignof decl is always accepted, even if it doesn't make sense: we default 50011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to 1 in those cases. 5002af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 50038b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(DRE->getDecl(), 50048b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5005a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5006af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) 50078b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck return Info.Ctx.getDeclAlign(ME->getMemberDecl(), 50088b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck /*RefAsPointee*/true); 5009af707ab8fbb9451e8febb8d766f6c043628125c4Chris Lattner 5010e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner return GetAlignOfType(E->getType()); 5011e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner} 5012e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5013e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner 5014f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with 5015f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne/// a result as the expression's type. 5016f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbournebool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( 5017f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *E) { 5018f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne switch(E->getKind()) { 5019f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_AlignOf: { 5020e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner if (E->isArgumentType()) 50214f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfType(E->getArgumentType()), E); 5022e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner else 50234f3bc8f7aa90b72832b03bee9201c98f4bb6b4d1Ken Dyck return Success(GetAlignOfExpr(E->getArgumentExpr()), E); 5024e9feb475d72ba50dc29cec62a8c47cae721065ebChris Lattner } 5025a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5026f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_VecStep: { 5027f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType Ty = E->getTypeOfArgument(); 50280518999d3adcc289997bd974dce90cc97f5c1c44Sebastian Redl 5029f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (Ty->isVectorType()) { 5030f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne unsigned n = Ty->getAs<VectorType>()->getNumElements(); 5031a1f47c447a919c6a05c63801cb6a52c4c288e2ccEli Friedman 5032f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // The vec_step built-in functions that take a 3-component 5033f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // vector return 4. (OpenCL 1.1 spec 6.11.12) 5034f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (n == 3) 5035f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne n = 4; 5036f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5037f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(n, E); 5038f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } else 5039f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return Success(1, E); 5040f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5041f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5042f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case UETT_SizeOf: { 5043f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne QualType SrcTy = E->getTypeOfArgument(); 5044f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, 5045f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne // the result is the size of the referenced type." 5046f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) 5047f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne SrcTy = Ref->getPointeeType(); 5048f2da9dfef96dc11b7b5effb1d02cb427b2d71599Eli Friedman 5049180f47959a066795cc0f409433023af448bb0328Richard Smith CharUnits Sizeof; 505074e1ad93fa8d6347549bcb10279fdf1fbc775321Richard Smith if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) 5051f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne return false; 5052180f47959a066795cc0f409433023af448bb0328Richard Smith return Success(Sizeof, E); 5053f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5054f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne } 5055f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne 5056f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne llvm_unreachable("unknown expr/type trait"); 5057fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner} 5058fcee0019b76f9f368f2b3d6d4048a98232593f29Chris Lattner 50598cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { 50608ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits Result; 50618cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne unsigned n = OOE->getNumComponents(); 50628ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (n == 0) 5063f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50648cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne QualType CurrentType = OOE->getTypeSourceInfo()->getType(); 50658ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor for (unsigned i = 0; i != n; ++i) { 50668ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor OffsetOfExpr::OffsetOfNode ON = OOE->getComponent(i); 50678ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor switch (ON.getKind()) { 50688ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Array: { 50698cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); 50708ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor APSInt IdxResult; 50718ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!EvaluateInteger(Idx, IdxResult, Info)) 50728ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor return false; 50738ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); 50748ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor if (!AT) 5075f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50768ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = AT->getElementType(); 50778ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); 50788ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor Result += IdxResult.getSExtValue() * ElementSize; 50798ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50808ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50828ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Field: { 50838ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor FieldDecl *MemberDecl = ON.getField(); 50848ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5085f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5086f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 50878ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor RecordDecl *RD = RT->getDecl(); 50888ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5089ba4f5d5754c8291690d01ca9581926673d69b24cJohn McCall unsigned i = MemberDecl->getFieldIndex(); 5090cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor assert(i < RL.getFieldCount() && "offsetof field in wrong type"); 5091fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); 50928ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor CurrentType = MemberDecl->getType().getNonReferenceType(); 50938ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor break; 50948ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 5095f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 50968ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor case OffsetOfExpr::OffsetOfNode::Identifier: 50978ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor llvm_unreachable("dependent __builtin_offsetof"); 5098f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 5099cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor case OffsetOfExpr::OffsetOfNode::Base: { 5100cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CXXBaseSpecifier *BaseSpec = ON.getBase(); 5101cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (BaseSpec->isVirtual()) 5102f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5103cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5104cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the layout of the class whose base we are looking into. 5105cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *RT = CurrentType->getAs<RecordType>(); 5106f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!RT) 5107f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5108cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor RecordDecl *RD = RT->getDecl(); 5109cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); 5110cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5111cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Find the base class itself. 5112cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor CurrentType = BaseSpec->getType(); 5113cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor const RecordType *BaseRT = CurrentType->getAs<RecordType>(); 5114cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor if (!BaseRT) 5115f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(OOE); 5116cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor 5117cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor // Add the offset to the base. 51187c7f820d70c925b29290a8563b59615816a827fcKen Dyck Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); 5119cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor break; 5120cc8a5d5f90bbbbcb46f342117b851b7e07ec34f1Douglas Gregor } 51218ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 51228ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor } 51238cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return Success(Result, OOE); 51248ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor} 51258ecdb65716cd7914ffb2eeee993fa9039fcd31e8Douglas Gregor 5126b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattnerbool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 512775a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner switch (E->getOpcode()) { 51284c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner default: 512975a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 513075a4881047deeb3a300ff9293dc6ba8570048bb5Chris Lattner // See C99 6.6p3. 5131f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 51322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 51334c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // FIXME: Should extension allow i-c-e extension expressions in its scope? 51344c4867e140327fa3b56306fa03c64c8e6a7c95efChris Lattner // If so, we could clear the diagnostic ID. 5135f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 51362de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 5137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // The result is just the value. 5138f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Visit(E->getSubExpr()); 5139f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Minus: { 5140f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5141f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5142f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5143789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith const APSInt &Value = Result.getInt(); 5144789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith if (Value.isSigned() && Value.isMinSignedValue()) 5145789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), 5146789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith E->getType()); 5147789f9b6be5df6e5151ac35e68416cdf550db1196Richard Smith return Success(-Value, E); 5148f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5149f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_Not: { 5150f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Visit(E->getSubExpr())) 5151f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5152f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!Result.isInt()) return Error(E); 5153f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(~Result.getInt(), E); 5154f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 5155f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith case UO_LNot: { 5156f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith bool bres; 5157f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) 5158f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5159f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Success(!bres, E); 5160f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 516106a3675627e3b3c47b49c689c8e404a33144194aAnders Carlsson } 5162a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 51631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5164732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// HandleCast - This is used to evaluate implicit or explicit casts where the 5165732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner/// result type is integer. 51668cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { 51678cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr *SubExpr = E->getSubExpr(); 516882206e267ce6cc709797127616f64672d255b310Anders Carlsson QualType DestType = E->getType(); 5169b92dac8bc2f6f73919825f9af693a8a7e89ae1d4Daniel Dunbar QualType SrcType = SubExpr->getType(); 517082206e267ce6cc709797127616f64672d255b310Anders Carlsson 517146a523285928aa07bf14803178dc04616ac85994Eli Friedman switch (E->getCastKind()) { 517246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerived: 517346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBase: 517446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_UncheckedDerivedToBase: 517546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dynamic: 517646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToUnion: 517746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ArrayToPointerDecay: 517846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FunctionToPointerDecay: 517946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToPointer: 518046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NullToMemberPointer: 518146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_BaseToDerivedMemberPointer: 518246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_DerivedToBaseMemberPointer: 51834d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 518446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ConstructorConversion: 518546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToPointer: 518646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ToVoid: 518746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_VectorSplat: 518846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToFloating: 518946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingCast: 51901d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 51911d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 519246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_AnyPointerToBlockPointerCast: 519346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_ObjCObjectLValueCast: 519446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingRealToComplex: 519546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToReal: 519646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexCast: 519746a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToIntegralComplex: 519846a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralRealToComplex: 519946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexCast: 520046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToFloatingComplex: 520146a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("invalid cast kind for integral value"); 520246a523285928aa07bf14803178dc04616ac85994Eli Friedman 5203e50c297f92914ca996deb8b597624193273b62e4Eli Friedman case CK_BitCast: 520446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_Dependent: 520546a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 520633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 520733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 520833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 520933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 5210f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 521146a523285928aa07bf14803178dc04616ac85994Eli Friedman 52127d580a4e9e47dffc3c17aa2b957ac57ca3c4e451Richard Smith case CK_UserDefinedConversion: 521346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueToRValue: 52147a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 52157a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 521646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_NoOp: 5217c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 521846a523285928aa07bf14803178dc04616ac85994Eli Friedman 521946a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_MemberPointerToBoolean: 522046a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToBoolean: 522146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralToBoolean: 522246a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToBoolean: 522346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingComplexToBoolean: 522446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToBoolean: { 52254efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman bool BoolResult; 5226c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) 52274efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5228131eb438d8c216b2e2a4f8fa8158ea88b787dc14Daniel Dunbar return Success(BoolResult, E); 52294efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 52304efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 523146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralCast: { 5232732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner if (!Visit(SubExpr)) 5233b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 5234a2cfd34952204c9a160fe1a5da5ba2f231df891dDaniel Dunbar 5235be26570e3faa009bdcefedfaf04473e518940520Eli Friedman if (!Result.isInt()) { 523665639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // Allow casts of address-of-label differences if they are no-ops 523765639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // or narrowing. (The narrowing case isn't actually guaranteed to 523865639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // be constant-evaluatable except in some narrow cases which are hard 523965639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // to detect here. We let it through on the assumption the user knows 524065639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman // what they are doing.) 524165639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman if (Result.isAddrLabelDiff()) 524265639284118d54ddf2e51a05d2ffccda567fe246Eli Friedman return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); 5243be26570e3faa009bdcefedfaf04473e518940520Eli Friedman // Only allow casts of lvalues if they are lossless. 5244be26570e3faa009bdcefedfaf04473e518940520Eli Friedman return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); 5245be26570e3faa009bdcefedfaf04473e518940520Eli Friedman } 524630c37f4d2ee5811e85f692c22fb67d74ddc88079Daniel Dunbar 5247f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, 5248f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.getInt()), E); 5249732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner } 52501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 525146a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_PointerToIntegral: { 5252c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; 5253c216a01c96d83bd9a90e214af64913e93d39aaccRichard Smith 5254efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 525587eae5ecf94e38baa20d9a327b8f73f8bdc72436Chris Lattner if (!EvaluatePointer(SubExpr, LV, Info)) 5256b542afe02d317411d53b3541946f9f2a8f509a11Chris Lattner return false; 52574efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5258dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (LV.getLValueBase()) { 5259dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar // Only allow based lvalue casts if they are lossless. 5260f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Allow a larger integer size than the pointer size, and allow 5261f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // narrowing back down to pointer width in subsequent integral casts. 5262f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith // FIXME: Check integer type's active bits, not its type size. 5263dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) 5264f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5265dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar 5266b755a9da095d2f2f04444797f1e1a9511693815bRichard Smith LV.Designator.setInvalid(); 5267efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LV.moveInto(Result); 5268dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar return true; 5269dd2116462ae311043986ae8b7fba27e68c1b2e66Daniel Dunbar } 52704efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5271a73058324197b7bdfd19307965954f626e26199dKen Dyck APSInt AsInt = Info.Ctx.MakeIntValue(LV.getLValueOffset().getQuantity(), 5272a73058324197b7bdfd19307965954f626e26199dKen Dyck SrcType); 5273f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); 52742bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson } 52754efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 527646a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_IntegralComplexToReal: { 5277f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue C; 52781725f683432715e5afe34d476024bd6f16eac3fcEli Friedman if (!EvaluateComplex(SubExpr, C, Info)) 52791725f683432715e5afe34d476024bd6f16eac3fcEli Friedman return false; 528046a523285928aa07bf14803178dc04616ac85994Eli Friedman return Success(C.getComplexIntReal(), E); 52811725f683432715e5afe34d476024bd6f16eac3fcEli Friedman } 52822217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 528346a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_FloatingToIntegral: { 528446a523285928aa07bf14803178dc04616ac85994Eli Friedman APFloat F(0.0); 528546a523285928aa07bf14803178dc04616ac85994Eli Friedman if (!EvaluateFloat(SubExpr, F, Info)) 528646a523285928aa07bf14803178dc04616ac85994Eli Friedman return false; 5287732b2236ae4a4f11e7642677cebbd169c07ea877Chris Lattner 5288c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith APSInt Value; 5289c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) 5290c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 5291c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return Success(Value, E); 529246a523285928aa07bf14803178dc04616ac85994Eli Friedman } 529346a523285928aa07bf14803178dc04616ac85994Eli Friedman } 52941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 529546a523285928aa07bf14803178dc04616ac85994Eli Friedman llvm_unreachable("unknown cast resulting in integral value"); 5296a25ae3d68d84d2b89907f998df6a396549589da5Anders Carlsson} 52972bad1687fe6f00e10767a691a33b070b151902b6Anders Carlsson 5298722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedmanbool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 5299722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 5300f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5301f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5302f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5303f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5304f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5305722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntReal(), E); 5306722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5307722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5308722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Visit(E->getSubExpr()); 5309722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman} 5310722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 5311664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedmanbool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 5312722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman if (E->getSubExpr()->getType()->isComplexIntegerType()) { 5313f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LV; 5314f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateComplex(E->getSubExpr(), LV, Info)) 5315f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 5316f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!LV.isComplexInt()) 5317f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5318722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman return Success(LV.getComplexIntImag(), E); 5319722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman } 5320722c717cd833e410ca6e7976d78baea16995e0c4Eli Friedman 53218327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 5322664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman return Success(0, E); 5323664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman} 5324664a104ba0b8f47b8908ec6af694d9646adba1fcEli Friedman 5325ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregorbool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { 5326ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor return Success(E->getPackLength(), E); 5327ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor} 5328ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor 5329295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redlbool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { 5330295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl return Success(E->getValue(), E); 5331295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl} 5332295995c9c3196416372c9cd35d9cedb6da37bd3dSebastian Redl 5333f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5334d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman// Float Evaluation 5335d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5336d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5337d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmannamespace { 5338770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass FloatExprEvaluator 53398cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<FloatExprEvaluator, bool> { 5340d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman APFloat &Result; 5341d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanpublic: 5342d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman FloatExprEvaluator(EvalInfo &info, APFloat &result) 53438cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(result) {} 5344d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 534547a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 53468cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result = V.getFloat(); 53478cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 53488cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 5349d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 535051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith bool ZeroInitialization(const Expr *E) { 5351f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); 5352f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith return true; 5353f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith } 5354f10d9171ac24380ca94c71847a9270a05b791cefRichard Smith 5355019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner bool VisitCallExpr(const CallExpr *E); 5356d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53575db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar bool VisitUnaryOperator(const UnaryOperator *E); 5358d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 5359d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman bool VisitFloatingLiteral(const FloatingLiteral *E); 53608cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 53612217c87bdc5ab357046a5453bdb06f469c41024eEli Friedman 5362abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryReal(const UnaryOperator *E); 5363abd3a857ace59100305790545d1baae5877b8945John McCall bool VisitUnaryImag(const UnaryOperator *E); 5364ba98d6bb414861965a1f22628494ea046785ecd4Eli Friedman 536551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // FIXME: Missing: array subscript of vector, member of vector 5366d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman}; 5367d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} // end anonymous namespace 5368d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5369d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanstatic bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { 5370c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isRealFloatingType()); 53718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return FloatExprEvaluator(Info, Result).Visit(E); 5372d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5373d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 53744ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadstatic bool TryEvaluateBuiltinNaN(const ASTContext &Context, 5375db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall QualType ResultTy, 5376db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const Expr *Arg, 5377db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall bool SNaN, 5378db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APFloat &Result) { 5379db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); 5380db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (!S) return false; 5381db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5382db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); 5383db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5384db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall llvm::APInt fill; 5385db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5386db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall // Treat empty strings as if they were zero. 5387db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (S->getString().empty()) 5388db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall fill = llvm::APInt(32, 0); 5389db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else if (S->getString().getAsInteger(0, fill)) 5390db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return false; 5391db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5392db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall if (SNaN) 5393db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getSNaN(Sem, false, &fill); 5394db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall else 5395db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall Result = llvm::APFloat::getQNaN(Sem, false, &fill); 5396db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall return true; 5397db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall} 5398db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 5399019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattnerbool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { 5400180f47959a066795cc0f409433023af448bb0328Richard Smith switch (E->isBuiltinCall()) { 54018cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne default: 54028cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ExprEvaluatorBaseTy::VisitCallExpr(E); 54038cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne 5404019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_val: 5405019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_valf: 5406019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_huge_vall: 5407019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inf: 5408019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner case Builtin::BI__builtin_inff: 54097cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar case Builtin::BI__builtin_infl: { 54107cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar const llvm::fltSemantics &Sem = 54117cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar Info.Ctx.getFloatTypeSemantics(E->getType()); 541234a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner Result = llvm::APFloat::getInf(Sem); 541334a74ab81600a40c6324fd76adb724b803dfaf91Chris Lattner return true; 54147cbed03c00e246682e5292785d01e1c120ce54bdDaniel Dunbar } 54151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5416db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nans: 5417db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansf: 5418db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall case Builtin::BI__builtin_nansl: 5419f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5420f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith true, Result)) 5421f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5422f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 5423db7b72a82a6834680ccf1eeb51dc57e6d935c655John McCall 54249e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nan: 54259e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanf: 54269e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner case Builtin::BI__builtin_nanl: 54274572baba9d18c275968ac113fd73b0e3c77cccb8Mike Stump // If this is __builtin_nan() turn this into a nan, otherwise we 54289e62171a25e3a08fb5c49fb370f83faf5ae786f5Chris Lattner // can't constant fold it. 5429f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), 5430f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith false, Result)) 5431f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 5432f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 54335db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54345db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabs: 54355db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsf: 54365db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_fabsl: 54375db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info)) 54385db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 54405db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (Result.isNegative()) 54415db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54425db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54435db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar 54441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysign: 54451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case Builtin::BI__builtin_copysignf: 54465db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar case Builtin::BI__builtin_copysignl: { 54475db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.); 54485db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar if (!EvaluateFloat(E->getArg(0), Result, Info) || 54495db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar !EvaluateFloat(E->getArg(1), RHS, Info)) 54505db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return false; 54515db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.copySign(RHS); 54525db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54535db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 5454019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner } 5455019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner} 5456019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5457abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { 545843efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 545943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 546043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 546143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 546243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatReal; 546343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 546443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 546543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 546643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return Visit(E->getSubExpr()); 5467abd3a857ace59100305790545d1baae5877b8945John McCall} 5468abd3a857ace59100305790545d1baae5877b8945John McCall 5469abd3a857ace59100305790545d1baae5877b8945John McCallbool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { 547043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (E->getSubExpr()->getType()->isAnyComplexType()) { 547143efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman ComplexValue CV; 547243efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman if (!EvaluateComplex(E->getSubExpr(), CV, Info)) 547343efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return false; 547443efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = CV.FloatImag; 547543efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman return true; 547643efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman } 547743efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman 54788327fad71da34492d82c532f42a58cb4baff81a3Richard Smith VisitIgnoredValue(E->getSubExpr()); 547943efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); 548043efa31fe601bb7c3f132f02246dc3c903d9f361Eli Friedman Result = llvm::APFloat::getZero(Sem); 5481abd3a857ace59100305790545d1baae5877b8945John McCall return true; 5482abd3a857ace59100305790545d1baae5877b8945John McCall} 5483abd3a857ace59100305790545d1baae5877b8945John McCall 54845db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbarbool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 54855db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar switch (E->getOpcode()) { 5486f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 54872de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 54887993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return EvaluateFloat(E->getSubExpr(), Result, Info); 54892de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 54907993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith if (!EvaluateFloat(E->getSubExpr(), Result, Info)) 54917993e8a2a26bf408c2a6d45f24fffa12db336b2bRichard Smith return false; 54925db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar Result.changeSign(); 54935db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar return true; 54945db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar } 54955db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar} 5496019f4e858e78587f2241ff1a76c747d7bcd7578cChris Lattner 5497d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5498e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 5499e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 550096e93660124c8028a4c3bcc038ab0cdd18cd7ab2Anders Carlsson 55015db4b3f3ed9f769d5b02c1d1ccc52bfd71fb9afbDaniel Dunbar APFloat RHS(0.0); 5502745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); 5503745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5504d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5505745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateFloat(E->getRHS(), RHS, Info) || !LHSOK) 5506d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return false; 5507d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5508d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman switch (E->getOpcode()) { 5509f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 55102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 5511d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.multiply(RHS, APFloat::rmNearestTiesToEven); 55127b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5514d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.add(RHS, APFloat::rmNearestTiesToEven); 55157b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5517d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.subtract(RHS, APFloat::rmNearestTiesToEven); 55187b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 55192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 5520d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result.divide(RHS, APFloat::rmNearestTiesToEven); 55217b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith break; 5522d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman } 55237b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith 55247b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith if (Result.isInfinity() || Result.isNaN()) 55257b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith CCEDiag(E, diag::note_constexpr_float_arithmetic) << Result.isNaN(); 55267b48a2986345480241f3b8209f71bb21b0530b4fRichard Smith return true; 5527d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5528d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 5529d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedmanbool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { 5530d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman Result = E->getValue(); 5531d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman return true; 5532d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman} 5533d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman 55348cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { 55358cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 55361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55372a523eec6a31955be876625819b89e8dc5def707Eli Friedman switch (E->getCastKind()) { 55382a523eec6a31955be876625819b89e8dc5def707Eli Friedman default: 5539c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 55402a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55412a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_IntegralToFloating: { 55424efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman APSInt IntResult; 5543c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return EvaluateInteger(SubExpr, IntResult, Info) && 5544c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, 5545c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith E->getType(), Result); 55464efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 55472a523eec6a31955be876625819b89e8dc5def707Eli Friedman 55482a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingCast: { 55494efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman if (!Visit(SubExpr)) 55504efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman return false; 5551c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), 5552c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Result); 55534efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman } 5554f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall 55552a523eec6a31955be876625819b89e8dc5def707Eli Friedman case CK_FloatingComplexToReal: { 5556f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall ComplexValue V; 5557f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall if (!EvaluateComplex(SubExpr, V, Info)) 5558f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return false; 5559f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall Result = V.getComplexFloatReal(); 5560f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall return true; 5561f3ea8cfe6b1c2ef0702efe130561e9e66708d799John McCall } 55622a523eec6a31955be876625819b89e8dc5def707Eli Friedman } 55634efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman} 55644efaa276bc0ce8f7baf6138ead11915f3e3e58d9Eli Friedman 5565d8bfe7f25a695ca947effbccdf9ecbe3e018e221Eli Friedman//===----------------------------------------------------------------------===// 5566a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar// Complex Evaluation (for float and integer) 55679ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 55689ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55699ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonnamespace { 5570770b4a8834670e9427d3ce5a1a8472eb86f45fd2Benjamin Kramerclass ComplexExprEvaluator 55718cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : public ExprEvaluatorBase<ComplexExprEvaluator, bool> { 5572f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue &Result; 55731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55749ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlssonpublic: 5575f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) 55768cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne : ExprEvaluatorBaseTy(info), Result(Result) {} 55771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 557847a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith bool Success(const CCValue &V, const Expr *e) { 55798cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne Result.setFrom(V); 55808cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return true; 55818cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne } 55821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 55837ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool ZeroInitialization(const Expr *E); 55847ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 55858cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55868cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne // Visitor Methods 55878cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne //===--------------------------------------------------------------------===// 55889ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 55898cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitImaginaryLiteral(const ImaginaryLiteral *E); 55908cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne bool VisitCastExpr(const CastExpr *E); 5591b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman bool VisitBinaryOperator(const BinaryOperator *E); 559296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara bool VisitUnaryOperator(const UnaryOperator *E); 55937ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman bool VisitInitListExpr(const InitListExpr *E); 5594b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman}; 5595b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} // end anonymous namespace 55961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5597b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedmanstatic bool EvaluateComplex(const Expr *E, ComplexValue &Result, 5598b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman EvalInfo &Info) { 5599c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith assert(E->isRValue() && E->getType()->isAnyComplexType()); 56008cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne return ComplexExprEvaluator(Info, Result).Visit(E); 5601b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5602b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56037ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { 5604f6c17a439f3320ac620639a3ee66dbdabb93810cEli Friedman QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType(); 56057ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (ElemTy->isRealFloatingType()) { 56067ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 56077ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); 56087ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatReal = Zero; 56097ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.FloatImag = Zero; 56107ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 56117ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 56127ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); 56137ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntReal = Zero; 56147ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.IntImag = Zero; 56157ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 56167ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 56177ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 56187ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 56198cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { 56208cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbourne const Expr* SubExpr = E->getSubExpr(); 5621b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5622b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (SubExpr->getType()->isRealFloatingType()) { 5623b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexFloat(); 5624b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Imag = Result.FloatImag; 5625b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateFloat(SubExpr, Imag, Info)) 5626b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5627b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5628b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.FloatReal = APFloat(Imag.getSemantics()); 5629b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5630b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } else { 5631b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman assert(SubExpr->getType()->isIntegerType() && 5632b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman "Unexpected imaginary literal."); 5633b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5634b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.makeComplexInt(); 5635b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Imag = Result.IntImag; 5636b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman if (!EvaluateInteger(SubExpr, Imag, Info)) 5637b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5638b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 5639b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); 5640b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return true; 5641b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman } 5642b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman} 5643b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56448cad3046be06ea73ff8892d947697a21d7a440d3Peter Collingbournebool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { 5645b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 56468786da77984e81d48e0e1b2bd339809b1efc19f3John McCall switch (E->getCastKind()) { 56478786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BitCast: 56488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerived: 56498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBase: 56508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UncheckedDerivedToBase: 56518786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dynamic: 56528786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToUnion: 56538786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ArrayToPointerDecay: 56548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FunctionToPointerDecay: 56558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToPointer: 56568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NullToMemberPointer: 56578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_BaseToDerivedMemberPointer: 56588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_DerivedToBaseMemberPointer: 56598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_MemberPointerToBoolean: 56604d4e5c1ae83f4510caa486b3ad19de13048f9f04John McCall case CK_ReinterpretMemberPointer: 56618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ConstructorConversion: 56628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToPointer: 56638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToIntegral: 56648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_PointerToBoolean: 56658786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ToVoid: 56668786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_VectorSplat: 56678786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralCast: 56688786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToBoolean: 56698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralToFloating: 56708786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToIntegral: 56718786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingToBoolean: 56728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingCast: 56731d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 56741d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 56758786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_AnyPointerToBlockPointerCast: 56768786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_ObjCObjectLValueCast: 56778786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToReal: 56788786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToBoolean: 56798786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToReal: 56808786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToBoolean: 568133e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 568233e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 568333e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 568433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 56858786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("invalid cast kind for complex value"); 56868786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56878786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_LValueToRValue: 56887a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 56897a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 56908786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_NoOp: 5691c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 56922bb5d00fcf71a7b4d478d478be778fff0494aff6John McCall 56938786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_Dependent: 569446a523285928aa07bf14803178dc04616ac85994Eli Friedman case CK_LValueBitCast: 56958786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_UserDefinedConversion: 5696f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 56978786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 56988786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingRealToComplex: { 5699b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APFloat &Real = Result.FloatReal; 57008786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateFloat(E->getSubExpr(), Real, Info)) 5701b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5702b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman 57038786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 57048786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.FloatImag = APFloat(Real.getSemantics()); 57058786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57068786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57078786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57088786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexCast: { 57098786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57108786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57118786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57128786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57138786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57148786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57158786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 5716c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && 5717c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); 57188786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57198786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57208786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_FloatingComplexToIntegralComplex: { 57218786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57228786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57238786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57248786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57258786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57268786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57278786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 5728c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleFloatToIntCast(Info, E, From, Result.FloatReal, 5729c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntReal) && 5730c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleFloatToIntCast(Info, E, From, Result.FloatImag, 5731c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.IntImag); 57328786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57338786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57348786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralRealToComplex: { 5735b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman APSInt &Real = Result.IntReal; 57368786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!EvaluateInteger(E->getSubExpr(), Real, Info)) 5737b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 57389ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 57398786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexInt(); 57408786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); 57418786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57428786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57438786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57448786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexCast: { 57458786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 5746b2dc7f59fe4c762cba73badc3bbc6f356fcd7b5bEli Friedman return false; 5747ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 57488786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57498786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57508786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57511725f683432715e5afe34d476024bd6f16eac3fcEli Friedman 5752f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); 5753f72fccf533bca206af8e75d041c29db99e6a7f2cRichard Smith Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); 57548786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return true; 57558786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 57568786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57578786da77984e81d48e0e1b2bd339809b1efc19f3John McCall case CK_IntegralComplexToFloatingComplex: { 57588786da77984e81d48e0e1b2bd339809b1efc19f3John McCall if (!Visit(E->getSubExpr())) 57598786da77984e81d48e0e1b2bd339809b1efc19f3John McCall return false; 57608786da77984e81d48e0e1b2bd339809b1efc19f3John McCall 57618786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType To = E->getType()->getAs<ComplexType>()->getElementType(); 57628786da77984e81d48e0e1b2bd339809b1efc19f3John McCall QualType From 57638786da77984e81d48e0e1b2bd339809b1efc19f3John McCall = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); 57648786da77984e81d48e0e1b2bd339809b1efc19f3John McCall Result.makeComplexFloat(); 5765c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return HandleIntToFloatCast(Info, E, From, Result.IntReal, 5766c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatReal) && 5767c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith HandleIntToFloatCast(Info, E, From, Result.IntImag, 5768c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith To, Result.FloatImag); 57698786da77984e81d48e0e1b2bd339809b1efc19f3John McCall } 5770ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 57711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 57728786da77984e81d48e0e1b2bd339809b1efc19f3John McCall llvm_unreachable("unknown cast resulting in complex value"); 57739ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson} 57749ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson 5775f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCallbool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { 5776e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) 57772ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith return ExprEvaluatorBaseTy::VisitBinaryOperator(E); 57782ad226bdc847df6b6b6e4f832856478ab63bb3dcRichard Smith 5779745f5147e065900267c85a5568785a1991d4838fRichard Smith bool LHSOK = Visit(E->getLHS()); 5780745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!LHSOK && !Info.keepEvaluatingAfterFailure()) 5781f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 57821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5783f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue RHS; 5784745f5147e065900267c85a5568785a1991d4838fRichard Smith if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) 5785f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return false; 5786a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar 57873f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar assert(Result.isComplexFloat() == RHS.isComplexFloat() && 57883f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar "Invalid operands to binary operator."); 5789ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson switch (E->getOpcode()) { 5790f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith default: return Error(E); 57912de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 5792a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5793a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), 5794a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5795a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), 5796a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5797a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5798a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() += RHS.getComplexIntReal(); 5799a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() += RHS.getComplexIntImag(); 5800a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 58013f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 58022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 5803a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar if (Result.isComplexFloat()) { 5804a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), 5805a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5806a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), 5807a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar APFloat::rmNearestTiesToEven); 5808a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } else { 5809a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntReal() -= RHS.getComplexIntReal(); 5810a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar Result.getComplexIntImag() -= RHS.getComplexIntImag(); 5811a5fd07bbc5e4bae542c06643da3fbfe4967a9379Daniel Dunbar } 58123f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 58132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 58143f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar if (Result.isComplexFloat()) { 5815f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 58163f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_r = LHS.getComplexFloatReal(); 58173f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &LHS_i = LHS.getComplexFloatImag(); 58183f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_r = RHS.getComplexFloatReal(); 58193f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat &RHS_i = RHS.getComplexFloatImag(); 58201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 58213f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar APFloat Tmp = LHS_r; 58223f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 58233f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal() = Tmp; 58243f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 58253f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 58263f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatReal().subtract(Tmp, APFloat::rmNearestTiesToEven); 58273f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar 58283f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_r; 58293f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 58303f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag() = Tmp; 58313f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp = LHS_i; 58323f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Tmp.multiply(RHS_r, APFloat::rmNearestTiesToEven); 58333f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar Result.getComplexFloatImag().add(Tmp, APFloat::rmNearestTiesToEven); 58343f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } else { 5835f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall ComplexValue LHS = Result; 58361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntReal() = 58373f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntReal() - 58383f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntImag()); 58391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Result.getComplexIntImag() = 58403f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar (LHS.getComplexIntReal() * RHS.getComplexIntImag() + 58413f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar LHS.getComplexIntImag() * RHS.getComplexIntReal()); 58423f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar } 58433f2798757c9ee353e207e18115e2e966432a4beeDaniel Dunbar break; 584496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case BO_Div: 584596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 584696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 584796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_r = LHS.getComplexFloatReal(); 584896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &LHS_i = LHS.getComplexFloatImag(); 584996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_r = RHS.getComplexFloatReal(); 585096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &RHS_i = RHS.getComplexFloatImag(); 585196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_r = Result.getComplexFloatReal(); 585296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat &Res_i = Result.getComplexFloatImag(); 585396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 585496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Den = RHS_r; 585596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.multiply(RHS_r, APFloat::rmNearestTiesToEven); 585696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APFloat Tmp = RHS_i; 585796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 585896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Den.add(Tmp, APFloat::rmNearestTiesToEven); 585996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 586096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r = LHS_r; 586196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.multiply(RHS_r, APFloat::rmNearestTiesToEven); 586296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_i; 586396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 586496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.add(Tmp, APFloat::rmNearestTiesToEven); 586596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_r.divide(Den, APFloat::rmNearestTiesToEven); 586696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 586796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i = LHS_i; 586896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.multiply(RHS_r, APFloat::rmNearestTiesToEven); 586996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp = LHS_r; 587096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Tmp.multiply(RHS_i, APFloat::rmNearestTiesToEven); 587196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.subtract(Tmp, APFloat::rmNearestTiesToEven); 587296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Res_i.divide(Den, APFloat::rmNearestTiesToEven); 587396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } else { 5874f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) 5875f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E, diag::note_expr_divide_by_zero); 5876f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 587796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara ComplexValue LHS = Result; 587896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + 587996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara RHS.getComplexIntImag() * RHS.getComplexIntImag(); 588096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = 588196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntReal() * RHS.getComplexIntReal() + 588296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; 588396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = 588496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara (LHS.getComplexIntImag() * RHS.getComplexIntReal() - 588596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; 588696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 588796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara break; 5888ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson } 5889ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 5890f4cf1a18d09d57b757b3cb47eab36c1457091ef7John McCall return true; 5891ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson} 5892ccc3fce5697e33f005990f9795e1c7cb8b4559ecAnders Carlsson 589396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnarabool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { 589496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // Get the operand value into 'Result'. 589596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (!Visit(E->getSubExpr())) 589696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return false; 589796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 589896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara switch (E->getOpcode()) { 589996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara default: 5900f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return Error(E); 590196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Extension: 590296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 590396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Plus: 590496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara // The result is always just the subexpr. 590596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 590696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Minus: 590796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) { 590896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatReal().changeSign(); 590996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 591096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 591196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else { 591296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntReal() = -Result.getComplexIntReal(); 591396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 591496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 591596fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 591696fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara case UO_Not: 591796fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara if (Result.isComplexFloat()) 591896fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexFloatImag().changeSign(); 591996fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara else 592096fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara Result.getComplexIntImag() = -Result.getComplexIntImag(); 592196fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara return true; 592296fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara } 592396fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara} 592496fc8e4086df323c49f17cac594db1d2f066a2e9Abramo Bagnara 59257ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedmanbool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { 59267ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getNumInits() == 2) { 59277ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (E->getType()->isComplexType()) { 59287ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexFloat(); 59297ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) 59307ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59317ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) 59327ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59337ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } else { 59347ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman Result.makeComplexInt(); 59357ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) 59367ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59377ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) 59387ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return false; 59397ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59407ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return true; 59417ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman } 59427ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman return ExprEvaluatorBaseTy::VisitInitListExpr(E); 59437ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman} 59447ead5c7b6fd48cf549e55b4db499c26ecf88ae75Eli Friedman 59459ad16aebc0e840a5e7d425da72eb6cbe25e4b58cAnders Carlsson//===----------------------------------------------------------------------===// 5946aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// Void expression evaluation, primarily for a cast to void on the LHS of a 5947aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith// comma operator 5948aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 5949aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5950aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithnamespace { 5951aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithclass VoidExprEvaluator 5952aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith : public ExprEvaluatorBase<VoidExprEvaluator, bool> { 5953aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithpublic: 5954aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} 5955aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5956aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool Success(const CCValue &V, const Expr *e) { return true; } 5957aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5958aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith bool VisitCastExpr(const CastExpr *E) { 5959aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith switch (E->getCastKind()) { 5960aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith default: 5961aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return ExprEvaluatorBaseTy::VisitCastExpr(E); 5962aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith case CK_ToVoid: 5963aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith VisitIgnoredValue(E->getSubExpr()); 5964aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return true; 5965aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5966aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } 5967aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith}; 5968aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} // end anonymous namespace 5969aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5970aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smithstatic bool EvaluateVoid(const Expr *E, EvalInfo &Info) { 5971aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith assert(E->isRValue() && E->getType()->isVoidType()); 5972aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return VoidExprEvaluator(Info).Visit(E); 5973aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith} 5974aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith 5975aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith//===----------------------------------------------------------------------===// 597651f4708c00110940ca3f337961915f2ca1668375Richard Smith// Top level Expr::EvaluateAsRValue method. 5977f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner//===----------------------------------------------------------------------===// 5978f5eeb055ecbadbc25c83df0867cdada2c2559dcfChris Lattner 597947a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smithstatic bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E) { 5980c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // In C, function designators are not lvalues, but we evaluate them as if they 5981c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith // are. 5982c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (E->isGLValue() || E->getType()->isFunctionType()) { 5983c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LValue LV; 5984c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith if (!EvaluateLValue(E, LV, Info)) 5985c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 5986c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith LV.moveInto(Result); 5987c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith } else if (E->getType()->isVectorType()) { 59881e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!EvaluateVector(E, Result, Info)) 598959b5da6d853b4368b984700315adf7b37de05764Nate Begeman return false; 5990575a1c9dc8dc5b4977194993e289f9eda7295c39Douglas Gregor } else if (E->getType()->isIntegralOrEnumerationType()) { 59911e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith if (!IntExprEvaluator(Info, Result).Visit(E)) 59926dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 5993efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->hasPointerRepresentation()) { 5994efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 5995efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluatePointer(E, LV, Info)) 59966dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 59971e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith LV.moveInto(Result); 5998efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isRealFloatingType()) { 5999efdb83e26f9a1fd2566afe54461216cd84814d42John McCall llvm::APFloat F(0.0); 6000efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateFloat(E, F, Info)) 60016dde0d5dc09f45f4d9508c964703e36fef1a0198Anders Carlsson return false; 600247a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result = CCValue(F); 6003efdb83e26f9a1fd2566afe54461216cd84814d42John McCall } else if (E->getType()->isAnyComplexType()) { 6004efdb83e26f9a1fd2566afe54461216cd84814d42John McCall ComplexValue C; 6005efdb83e26f9a1fd2566afe54461216cd84814d42John McCall if (!EvaluateComplex(E, C, Info)) 6006660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 60071e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith C.moveInto(Result); 600869c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } else if (E->getType()->isMemberPointerType()) { 6009e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith MemberPtr P; 6010e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (!EvaluateMemberPointer(E, P, Info)) 6011e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return false; 6012e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith P.moveInto(Result); 6013e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith return true; 601451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isArrayType()) { 6015180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 601683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6017180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6018cc5d4f637cdf83adc174b96d2bfe27cef1cf0f36Richard Smith return false; 6019180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 602051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } else if (E->getType()->isRecordType()) { 6021180f47959a066795cc0f409433023af448bb0328Richard Smith LValue LV; 602283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.set(E, Info.CurrentCall->Index); 6023180f47959a066795cc0f409433023af448bb0328Richard Smith if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info)) 6024180f47959a066795cc0f409433023af448bb0328Richard Smith return false; 6025180f47959a066795cc0f409433023af448bb0328Richard Smith Result = Info.CurrentCall->Temporaries[E]; 6026aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith } else if (E->getType()->isVoidType()) { 6027c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith if (Info.getLangOpts().CPlusPlus0x) 6028c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_nonliteral) 6029c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith << E->getType(); 6030c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith else 6031c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.CCEDiag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 6032aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith if (!EvaluateVoid(E, Info)) 6033aa9c3503867bc52e1f61c4da676116db1b1cdf01Richard Smith return false; 6034c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith } else if (Info.getLangOpts().CPlusPlus0x) { 6035c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith Info.Diag(E->getExprLoc(), diag::note_constexpr_nonliteral) << E->getType(); 6036c1c5f27c64dfc3332d53ad30e44d626e4f9afac3Richard Smith return false; 6037f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } else { 6038dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith Info.Diag(E->getExprLoc(), diag::note_invalid_subexpr_in_const_expr); 6039660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return false; 6040f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6041660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 6042660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump return true; 6043660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump} 6044660e6f79a138a30a437c02142f23e7ef4eb21b2eMike Stump 604583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some 604683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// cases, the in-place evaluation is essential, since later initializers for 604783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith/// an object can indirectly refer to subobjects which were initialized earlier. 604883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smithstatic bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, 604983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith const Expr *E, CheckConstantExpressionKind CCEK, 605083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith bool AllowNonLiteralTypes) { 60517ca4850a3e3530fa6c93b64b740446e32c97f992Richard Smith if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E)) 605251201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 605351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 605451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (E->isRValue()) { 605569c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // Evaluate arrays and record types in-place, so that later initializers can 605669c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // refer to earlier-initialized members of the object. 6057180f47959a066795cc0f409433023af448bb0328Richard Smith if (E->getType()->isArrayType()) 6058180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateArray(E, This, Result, Info); 6059180f47959a066795cc0f409433023af448bb0328Richard Smith else if (E->getType()->isRecordType()) 6060180f47959a066795cc0f409433023af448bb0328Richard Smith return EvaluateRecord(E, This, Result, Info); 606169c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith } 606269c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 606369c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith // For any other type, in-place evaluation is unimportant. 606469c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith CCValue CoreConstResult; 606583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!Evaluate(CoreConstResult, Info, E)) 606683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 606783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = CoreConstResult.toAPValue(); 606883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 606969c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith} 607069c2c50498dadfa6bb99baba52187e3cfa0ac78aRichard Smith 6071f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// EvaluateAsRValue - Try to evaluate this expression, performing an implicit 6072f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// lvalue-to-rvalue cast if it is an lvalue. 6073f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { 607451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (!CheckLiteralType(Info, E)) 607551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 607651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 6077f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith CCValue Value; 6078f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!::Evaluate(Value, Info, E)) 6079f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6080f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6081f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (E->isGLValue()) { 6082f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LValue LV; 6083f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith LV.setFrom(Value); 6084f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!HandleLValueToRValueConversion(Info, E, E->getType(), LV, Value)) 6085f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6086f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6087f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6088f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // Check this core constant expression is a constant expression, and if so, 6089f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith // convert it to one. 609083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result = Value.toAPValue(); 609183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); 6092f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6093c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith 609451f4708c00110940ca3f337961915f2ca1668375Richard Smith/// EvaluateAsRValue - Return true if this is a constant which we can fold using 609556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// any crazy technique (that has nothing to do with language standards) that 609656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall/// we want to. If this function returns true, it returns the folded constant 6097c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 6098c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith/// will be applied to the result. 609951f4708c00110940ca3f337961915f2ca1668375Richard Smithbool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const { 6100ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // Fast-path evaluations of integer literals, since we sometimes see files 6101ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith // containing vast quantities of these. 6102ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) { 6103ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith Result.Val = APValue(APSInt(L->getValue(), 6104ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith L->getType()->isUnsignedIntegerType())); 6105ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith return true; 6106ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith } 6107ee19f43bf8973bfcccb7329e32a4198641767949Richard Smith 61082d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating values of large array and record types can cause 61092d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 6110e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 6111e24f5fc8c763f1b5536b8d70dd510ca959db3a80Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 61121445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith return false; 61131445bbacf4c8de5f208ff4ccb302424a4d9e233eRichard Smith 6114f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith EvalInfo Info(Ctx, Result); 6115f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return ::EvaluateAsRValue(Info, this, Result.Val); 611656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall} 611756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 61184ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsBooleanCondition(bool &Result, 61194ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Ctx) const { 6120c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult Scratch; 612151f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Scratch, Ctx) && 6122b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith HandleConversionToBool(CCValue(const_cast<ASTContext&>(Ctx), 6123b4e85ed51905fc94378d7b4ff62b06e0d08042b7Richard Smith Scratch.Val, CCValue::GlobalValue()), 612447a1eed1cdd36edbefc318f29be6c0f3212b0c41Richard Smith Result); 6125cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall} 6126cd7a445c6b46c5585580dfb652300c8483c0cb6bJohn McCall 612780d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smithbool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx, 612880d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith SideEffectsKind AllowSideEffects) const { 612980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!getType()->isIntegralOrEnumerationType()) 613080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return false; 613180d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith 6132c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith EvalResult ExprResult; 613380d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (!EvaluateAsRValue(ExprResult, Ctx) || !ExprResult.Val.isInt() || 613480d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith (!AllowSideEffects && ExprResult.HasSideEffects)) 6135c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return false; 6136f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6137c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith Result = ExprResult.Val.getInt(); 6138c49bd11f96c2378969822f1f1b814ffa8f2bfee4Richard Smith return true; 6139a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith} 6140a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith 61414ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const { 61421b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson EvalInfo Info(Ctx, Result); 61431b78276a75a5a0f496a82429c1ff9604d622a76dAnders Carlsson 6144efdb83e26f9a1fd2566afe54461216cd84814d42John McCall LValue LV; 614583587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateLValue(this, LV, Info) || Result.HasSideEffects || 614683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith !CheckLValueConstantExpression(Info, getExprLoc(), 614783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Ctx.getLValueReferenceType(getType()), LV)) 614883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 614983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 615083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Tmp; 615183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith LV.moveInto(Tmp); 615283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Result.Val = Tmp.toAPValue(); 615383587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return true; 6154b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman} 6155b2f295c8050fb8c141bf2cf38eed0a56e99d0092Eli Friedman 6156099e7f647ccda915513f2b2ec53352dc756082d3Richard Smithbool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, 6157099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD, 6158099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const { 61592d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // FIXME: Evaluating initializers for large array and record types can cause 61602d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith // performance problems. Only do so in C++11 for now. 61612d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && 61622d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith !Ctx.getLangOptions().CPlusPlus0x) 61632d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith return false; 61642d6a5670465cb3f1d811695a9f23e372508240d2Richard Smith 6165099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith Expr::EvalStatus EStatus; 6166099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EStatus.Diag = &Notes; 6167099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6168099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith EvalInfo InitInfo(Ctx, EStatus); 6169099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith InitInfo.setEvaluatingDecl(VD, Value); 6170099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 6171099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LValue LVal; 6172099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith LVal.set(VD); 6173099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 617451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // C++11 [basic.start.init]p2: 617551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // Variables with static storage duration or thread storage duration shall be 617651201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // zero-initialized before any other initialization takes place. 617751201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith // This behavior is not present in C. 617851201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith if (Ctx.getLangOptions().CPlusPlus && !VD->hasLocalStorage() && 617951201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith !VD->getType()->isReferenceType()) { 618051201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith ImplicitValueInitExpr VIE(VD->getType()); 618183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, &VIE, CCEK_Constant, 618283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true)) 618351201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith return false; 618451201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith } 618551201882382fb40c9456a06c7f93d6ddd4a57712Richard Smith 618683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith if (!EvaluateInPlace(Value, InitInfo, LVal, this, CCEK_Constant, 618783587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith /*AllowNonLiteralTypes=*/true) || 618883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith EStatus.HasSideEffects) 618983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return false; 619083587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith 619183587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith return CheckConstantExpression(InitInfo, VD->getLocation(), VD->getType(), 619283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith Value); 6193099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith} 6194099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith 619551f4708c00110940ca3f337961915f2ca1668375Richard Smith/// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 619651f4708c00110940ca3f337961915f2ca1668375Richard Smith/// constant folded, but discard the result. 61974ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::isEvaluatable(const ASTContext &Ctx) const { 61984fdfb0965b396f2778091f7e6c051d17ff9791baAnders Carlsson EvalResult Result; 619951f4708c00110940ca3f337961915f2ca1668375Richard Smith return EvaluateAsRValue(Result, Ctx) && !Result.HasSideEffects; 620045b6b9d080ac56917337d73d8f1cd6374b27b05dChris Lattner} 620151fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 62024ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadbool Expr::HasSideEffects(const ASTContext &Ctx) const { 62031e12c59e8f9bb76c23628c4e0d0a1dfced0b1fa0Richard Smith return HasSideEffect(Ctx).Visit(this); 6204393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian} 6205393c247fe025ccb5f914e37e948192ea86faef8cFariborz Jahanian 6206a6b8b2c09610b8bc4330e948ece8b940c2386406Richard SmithAPSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx) const { 62071c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson EvalResult EvalResult; 620851f4708c00110940ca3f337961915f2ca1668375Richard Smith bool Result = EvaluateAsRValue(EvalResult, Ctx); 6209c6ed729f669044f5072a49d79041f455d971ece3Jeffrey Yasskin (void)Result; 621051fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson assert(Result && "Could not evaluate expression"); 62111c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson assert(EvalResult.Val.isInt() && "Expression did not evaluate to integer"); 621251fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson 62131c0cfd4599e816cfd7a8f348286bf0ad79652ffcAnders Carlsson return EvalResult.Val.getInt(); 621451fe996231b1d7199f76e4005ff4c943d5deeecdAnders Carlsson} 6215d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6216e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara bool Expr::EvalResult::isGlobalLValue() const { 6217e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara assert(Val.isLValue()); 6218e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara return IsGlobalLValue(Val.getLValueBase()); 6219e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara } 6220e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6221e17a6436b429e4b18a5e157061fb13bbc677b3b0Abramo Bagnara 6222d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// isIntegerConstantExpr - this recursive routine will test if an expression is 6223d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// an integer constant expression. 6224d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6225d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 6226d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// comma, etc 6227d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// 6228d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 6229d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 6230d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall/// cast+dereference. 6231d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6232d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// CheckICE - This function does the fundamental ICE checking: the returned 6233d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// ICEDiag contains a Val of 0, 1, or 2, and a possibly null SourceLocation. 6234d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Note that to reduce code duplication, this helper does no evaluation 6235d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// itself; the caller checks whether the expression is evaluatable, and 6236d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// in the rare cases where CheckICE actually cares about the evaluated 6237d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// value, it calls into Evalute. 6238d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 6239d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// Meanings of Val: 624051f4708c00110940ca3f337961915f2ca1668375Richard Smith// 0: This expression is an ICE. 6241d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 1: This expression is not an ICE, but if it isn't evaluated, it's 6242d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// a legal subexpression for an ICE. This return value is used to handle 6243d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// the comma operator in C99 mode. 6244d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall// 2: This expression is not an ICE, and is not a legal subexpression for one. 6245d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62463c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmannamespace { 62473c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 6248d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstruct ICEDiag { 6249d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall unsigned Val; 6250d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall SourceLocation Loc; 6251d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6252d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall public: 6253d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag(unsigned v, SourceLocation l) : Val(v), Loc(l) {} 6254d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag() : Val(0) {} 6255d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall}; 6256d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 62573c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman} 62583c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohman 62593c46e8db99196179b30e7ac5c20c4efd5f3926d7Dan Gohmanstatic ICEDiag NoDiag() { return ICEDiag(); } 6260d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6261d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckEvalInICE(const Expr* E, ASTContext &Ctx) { 6262d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall Expr::EvalResult EVResult; 626351f4708c00110940ca3f337961915f2ca1668375Richard Smith if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects || 6264d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall !EVResult.Val.isInt()) { 6265d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6266d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6267d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6268d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6269d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6270d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCallstatic ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) { 6271d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall assert(!E->isValueDependent() && "Should not see value dependent exprs!"); 62722ade35e2cfd554e49d35a52047cea98a82787af9Douglas Gregor if (!E->getType()->isIntegralOrEnumerationType()) { 6273d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6274d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6275d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6276d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (E->getStmtClass()) { 627763c00d7f35fa060c0a446c9df3a4402d9c7757feJohn McCall#define ABSTRACT_STMT(Node) 6278d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define STMT(Node, Base) case Expr::Node##Class: 6279d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#define EXPR(Node, Base) 6280d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall#include "clang/AST/StmtNodes.inc" 6281d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::PredefinedExprClass: 6282d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::FloatingLiteralClass: 6283d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImaginaryLiteralClass: 6284d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StringLiteralClass: 6285d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ArraySubscriptExprClass: 6286d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::MemberExprClass: 6287d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundAssignOperatorClass: 6288d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CompoundLiteralExprClass: 6289d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ExtVectorElementExprClass: 6290d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DesignatedInitExprClass: 6291d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitValueInitExprClass: 6292d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenListExprClass: 6293d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::VAArgExprClass: 6294d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::AddrLabelExprClass: 6295d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::StmtExprClass: 6296d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXMemberCallExprClass: 6297e08ce650a2b02410eddd1f60a4aa6b3d4be71e73Peter Collingbourne case Expr::CUDAKernelCallExprClass: 6298d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDynamicCastExprClass: 6299d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTypeidExprClass: 63009be88403e965cc49af76c9d33d818781d44b333eFrancois Pichet case Expr::CXXUuidofExprClass: 6301d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNullPtrLiteralExprClass: 6302d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThisExprClass: 6303d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXThrowExprClass: 6304d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXNewExprClass: 6305d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDeleteExprClass: 6306d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXPseudoDestructorExprClass: 6307d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedLookupExprClass: 6308d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DependentScopeDeclRefExprClass: 6309d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXConstructExprClass: 6310d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBindTemporaryExprClass: 63114765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall case Expr::ExprWithCleanupsClass: 6312d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXTemporaryObjectExprClass: 6313d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXUnresolvedConstructExprClass: 6314d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDependentScopeMemberExprClass: 6315d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnresolvedMemberExprClass: 6316d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCStringLiteralClass: 6317d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCEncodeExprClass: 6318d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCMessageExprClass: 6319d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCSelectorExprClass: 6320d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCProtocolExprClass: 6321d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIvarRefExprClass: 6322d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCPropertyRefExprClass: 6323d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ObjCIsaExprClass: 6324d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ShuffleVectorExprClass: 6325d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockExprClass: 6326d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BlockDeclRefExprClass: 6327d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::NoStmtClass: 63287cd7d1ad33fdf49eef83942e8855fe20d95aa1b9John McCall case Expr::OpaqueValueExprClass: 6329be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor case Expr::PackExpansionExprClass: 6330c7793c73ba8a343de3f2552d984851985a46f159Douglas Gregor case Expr::SubstNonTypeTemplateParmPackExprClass: 633161eee0ca33b29e102f11bab77c8b74cc00e2392bTanya Lattner case Expr::AsTypeExprClass: 6332f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCIndirectCopyRestoreExprClass: 633303e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor case Expr::MaterializeTemporaryExprClass: 63344b9c2d235fb9449e249d74f48ecfec601650de93John McCall case Expr::PseudoObjectExprClass: 6335276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman case Expr::AtomicExprClass: 6336cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl case Expr::InitListExprClass: 633701d08018b7cf5ce1601707cfd7a84d22015fc04eDouglas Gregor case Expr::LambdaExprClass: 6338cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl return ICEDiag(2, E->getLocStart()); 6339cea8d966f826554f0679595e9371e314e8dbc1cfSebastian Redl 6340ee8aff06f6a96214731de17b2cb6df407c6c1820Douglas Gregor case Expr::SizeOfPackExprClass: 6341d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::GNUNullExprClass: 6342d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // GCC considers the GNU __null value to be an integral constant expression. 6343d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6344d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 634591a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall case Expr::SubstNonTypeTemplateParmExprClass: 634691a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return 634791a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); 634891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall 6349d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ParenExprClass: 6350d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); 6351f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne case Expr::GenericSelectionExprClass: 6352f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); 6353d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::IntegerLiteralClass: 6354d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CharacterLiteralClass: 6355d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXBoolLiteralExprClass: 6356ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor case Expr::CXXScalarValueInitExprClass: 6357d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryTypeTraitExprClass: 63586ad6f2848d7652ab2991286eb48be440d3493b28Francois Pichet case Expr::BinaryTypeTraitExprClass: 635921ff2e516b0e0bc8c1dbf965cb3d44bac3c64330John Wiegley case Expr::ArrayTypeTraitExprClass: 6360552622067dc45013d240f73952fece703f5e63bdJohn Wiegley case Expr::ExpressionTraitExprClass: 63612e156225a29407a50dd19041aa5750171ad44ea3Sebastian Redl case Expr::CXXNoexceptExprClass: 6362d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6363d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CallExprClass: 63646cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt case Expr::CXXOperatorCallExprClass: { 636505830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows function calls within unevaluated subexpressions of 636605830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 636705830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an operand of (pointer to) function type. 6368d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const CallExpr *CE = cast<CallExpr>(E); 6369180f47959a066795cc0f409433023af448bb0328Richard Smith if (CE->isBuiltinCall()) 6370d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6371d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6372d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6373d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::DeclRefExprClass: 6374d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) 6375d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 637603f96110bc2c2c773e06a42982b17a03dd2e5379Richard Smith if (Ctx.getLangOptions().CPlusPlus && IsConstNonVolatile(E->getType())) { 6377d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); 6378d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6379d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Parameter variables are never constants. Without this check, 6380d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // getAnyInitializer() can find a default argument, which leads 6381d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to chaos. 6382d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (isa<ParmVarDecl>(D)) 6383d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6384d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6385d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C++ 7.1.5.1p2 6386d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // A variable of non-volatile const-qualified integral or enumeration 6387d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // type initialized by an ICE can be used in ICEs. 6388d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { 6389db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith if (!Dcl->getType()->isIntegralOrEnumerationType()) 6390db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6391db1822c6de43ff4aa5fa00234bf8222f6f4816e8Richard Smith 6392099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith const VarDecl *VD; 6393099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // Look for a declaration of this variable that has an initializer, and 6394099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith // check whether it is an ICE. 6395099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) 6396099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return NoDiag(); 6397099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith else 6398099e7f647ccda915513f2b2ec53352dc756082d3Richard Smith return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation()); 6399d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6400d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6401d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6402d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::UnaryOperatorClass: { 6403d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const UnaryOperator *Exp = cast<UnaryOperator>(E); 6404d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 64052de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostInc: 64062de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PostDec: 64072de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreInc: 64082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_PreDec: 64092de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_AddrOf: 64102de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Deref: 641105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows increment and decrement within unevaluated 641205830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // subexpressions of constant expressions, but they can never be ICEs 641305830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // because an ICE cannot contain an lvalue operand. 6414d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 64152de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Extension: 64162de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_LNot: 64172de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Plus: 64182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Minus: 64192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Not: 64202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Real: 64212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case UO_Imag: 6422d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(Exp->getSubExpr(), Ctx); 6423d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6424d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6425d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // OffsetOf falls through here. 6426d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6427d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::OffsetOfExprClass: { 6428d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that per C99, offsetof must be an ICE. And AFAIK, using 642951f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue matches the proposed gcc behavior for cases like 643005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect 6431d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // compliance: we should warn earlier for offsetof expressions with 6432d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // array subscripts that aren't ICEs, and if the array subscripts 6433d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // are ICEs, the value of the offsetof must be an integer constant. 6434d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckEvalInICE(E, Ctx); 6435d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6436f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne case Expr::UnaryExprOrTypeTraitExprClass: { 6437f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); 6438f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne if ((Exp->getKind() == UETT_SizeOf) && 6439f4e3cfbe8abd124be6341ef5d714819b4fbd9082Peter Collingbourne Exp->getTypeOfArgument()->isVariableArrayType()) 6440d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6441d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6442d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6443d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::BinaryOperatorClass: { 6444d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const BinaryOperator *Exp = cast<BinaryOperator>(E); 6445d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall switch (Exp->getOpcode()) { 64462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemD: 64472de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_PtrMemI: 64482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Assign: 64492de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_MulAssign: 64502de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_DivAssign: 64512de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_RemAssign: 64522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AddAssign: 64532de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_SubAssign: 64542de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShlAssign: 64552de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_ShrAssign: 64562de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_AndAssign: 64572de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_XorAssign: 64582de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_OrAssign: 645905830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // C99 6.6/3 allows assignments within unevaluated subexpressions of 646005830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // constant expressions, but they can never be ICEs because an ICE cannot 646105830143fa8c70b8bc46c96b93018455d8a2ca92Richard Smith // contain an lvalue operand. 6462d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6463d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 64642de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Mul: 64652de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Div: 64662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Rem: 64672de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Add: 64682de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Sub: 64692de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shl: 64702de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Shr: 64712de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LT: 64722de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GT: 64732de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LE: 64742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_GE: 64752de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_EQ: 64762de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_NE: 64772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_And: 64782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Xor: 64792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Or: 64802de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_Comma: { 6481d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6482d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 64832de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Div || 64842de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall Exp->getOpcode() == BO_Rem) { 648551f4708c00110940ca3f337961915f2ca1668375Richard Smith // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure 6486d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // we don't evaluate one. 64873b332ab132fa85c83833d74d400f6e126f52fbd2John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) { 6488a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); 6489d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval == 0) 6490d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6491d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (REval.isSigned() && REval.isAllOnesValue()) { 6492a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); 6493d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LEval.isMinSignedValue()) 6494d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6495d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6496d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6497d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 64982de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (Exp->getOpcode() == BO_Comma) { 6499d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Ctx.getLangOptions().C99) { 6500d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // C99 6.6p3 introduces a strange edge case: comma can be in an ICE 6501d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // if it isn't evaluated. 6502d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 0) 6503d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(1, E->getLocStart()); 6504d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } else { 6505d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // In both C89 and C++, commas in ICEs are illegal. 6506d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return ICEDiag(2, E->getLocStart()); 6507d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6508d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6509d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6510d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6511d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6512d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 65132de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LAnd: 65142de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case BO_LOr: { 6515d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); 6516d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); 6517d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val == 0 && RHSResult.Val == 1) { 6518d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the RHS has a comma "side-effect"; we need 6519d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // to actually check the condition to see whether the side 6520d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // with the comma is evaluated. 65212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if ((Exp->getOpcode() == BO_LAnd) != 6522a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) 6523d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6524d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6525d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6526d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6527d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (LHSResult.Val >= RHSResult.Val) 6528d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return LHSResult; 6529d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return RHSResult; 6530d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6531d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6532d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6533d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ImplicitCastExprClass: 6534d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CStyleCastExprClass: 6535d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXFunctionalCastExprClass: 6536d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXStaticCastExprClass: 6537d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXReinterpretCastExprClass: 653832cb47174304bc7ec11478b9497c4e10f48273d9Richard Smith case Expr::CXXConstCastExprClass: 6539f85e193739c953358c865005855253af4f68a497John McCall case Expr::ObjCBridgedCastExprClass: { 6540d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); 65412116b144cf07f2574d20517187eb8863645376ebRichard Smith if (isa<ExplicitCastExpr>(E)) { 65422116b144cf07f2574d20517187eb8863645376ebRichard Smith if (const FloatingLiteral *FL 65432116b144cf07f2574d20517187eb8863645376ebRichard Smith = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { 65442116b144cf07f2574d20517187eb8863645376ebRichard Smith unsigned DestWidth = Ctx.getIntWidth(E->getType()); 65452116b144cf07f2574d20517187eb8863645376ebRichard Smith bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); 65462116b144cf07f2574d20517187eb8863645376ebRichard Smith APSInt IgnoredVal(DestWidth, !DestSigned); 65472116b144cf07f2574d20517187eb8863645376ebRichard Smith bool Ignored; 65482116b144cf07f2574d20517187eb8863645376ebRichard Smith // If the value does not fit in the destination type, the behavior is 65492116b144cf07f2574d20517187eb8863645376ebRichard Smith // undefined, so we are not required to treat it as a constant 65502116b144cf07f2574d20517187eb8863645376ebRichard Smith // expression. 65512116b144cf07f2574d20517187eb8863645376ebRichard Smith if (FL->getValue().convertToInteger(IgnoredVal, 65522116b144cf07f2574d20517187eb8863645376ebRichard Smith llvm::APFloat::rmTowardZero, 65532116b144cf07f2574d20517187eb8863645376ebRichard Smith &Ignored) & APFloat::opInvalidOp) 65542116b144cf07f2574d20517187eb8863645376ebRichard Smith return ICEDiag(2, E->getLocStart()); 65552116b144cf07f2574d20517187eb8863645376ebRichard Smith return NoDiag(); 65562116b144cf07f2574d20517187eb8863645376ebRichard Smith } 65572116b144cf07f2574d20517187eb8863645376ebRichard Smith } 6558eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman switch (cast<CastExpr>(E)->getCastKind()) { 6559eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_LValueToRValue: 65607a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_AtomicToNonAtomic: 65617a7ee3033e44b45630981355460ef89efa0bdcc4David Chisnall case CK_NonAtomicToAtomic: 6562eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_NoOp: 6563eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralToBoolean: 6564eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman case CK_IntegralCast: 6565d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(SubExpr, Ctx); 6566eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman default: 6567eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman return ICEDiag(2, E->getLocStart()); 6568eea0e817c609c662f3fef61bb257fddf1ae8f7b7Eli Friedman } 6569d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 657056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall case Expr::BinaryConditionalOperatorClass: { 657156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); 657256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); 657356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 2) return CommonResult; 657456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 657556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 2) return FalseResult; 657656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (CommonResult.Val == 1) return CommonResult; 657756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall if (FalseResult.Val == 1 && 6578a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith Exp->getCommon()->EvaluateKnownConstInt(Ctx) == 0) return NoDiag(); 657956ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall return FalseResult; 658056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall } 6581d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ConditionalOperatorClass: { 6582d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall const ConditionalOperator *Exp = cast<ConditionalOperator>(E); 6583d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // If the condition (ignoring parens) is a __builtin_constant_p call, 6584d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // then only the true side is actually considered in an integer constant 6585d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // expression, and it is fully evaluated. This is an important GNU 6586d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // extension. See GCC PR38377 for discussion. 6587d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (const CallExpr *CallCE 6588d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) 658980d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) 659080d4b55db94db2172a04617d1a80feca6bbcea5cRichard Smith return CheckEvalInICE(E, Ctx); 6591d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); 6592d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 2) 6593d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 659463fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6595f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); 6596f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); 659763fe6814f339df30b8463b39995947cbdf920e48Douglas Gregor 6598d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 2) 6599d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6600d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (FalseResult.Val == 2) 6601d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6602d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (CondResult.Val == 1) 6603d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CondResult; 6604d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (TrueResult.Val == 0 && FalseResult.Val == 0) 6605d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return NoDiag(); 6606d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Rare case where the diagnostics depend on which side is evaluated 6607d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // Note that if we get here, CondResult is 0, and at least one of 6608d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall // TrueResult and FalseResult is non-zero. 6609a6b8b2c09610b8bc4330e948ece8b940c2386406Richard Smith if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) { 6610d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return FalseResult; 6611d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6612d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return TrueResult; 6613d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6614d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::CXXDefaultArgExprClass: 6615d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); 6616d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall case Expr::ChooseExprClass: { 6617d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(Ctx), Ctx); 6618d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6619d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6620d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 66213026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid StmtClass!"); 6622d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 6623d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall 6624f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith/// Evaluate an expression as a C++11 integral constant expression. 6625f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithstatic bool EvaluateCPlusPlus11IntegralConstantExpr(ASTContext &Ctx, 6626f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith const Expr *E, 6627f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith llvm::APSInt *Value, 6628f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc) { 6629f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!E->getType()->isIntegralOrEnumerationType()) { 6630f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Loc) *Loc = E->getExprLoc(); 6631f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6632f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith } 6633f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 66344c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Result; 66354c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) 6636dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return false; 6637dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith 66384c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Result.isInt() && "pointer cast to int is not an ICE"); 66394c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Value) *Value = Result.getInt(); 6640dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smith return true; 6641f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6642f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6643dd1f29b6d686899bfd033f26e16cb1621e5549e8Richard Smithbool Expr::isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 6644f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6645f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, 0, Loc); 6646f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6647d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall ICEDiag d = CheckICE(this, Ctx); 6648d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (d.Val != 0) { 6649d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall if (Loc) *Loc = d.Loc; 6650d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return false; 6651d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall } 6652f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return true; 6653f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith} 6654f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6655f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smithbool Expr::isIntegerConstantExpr(llvm::APSInt &Value, ASTContext &Ctx, 6656f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith SourceLocation *Loc, bool isEvaluated) const { 6657f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (Ctx.getLangOptions().CPlusPlus0x) 6658f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); 6659f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith 6660f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!isIntegerConstantExpr(Ctx, Loc)) 6661f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith return false; 6662f48fdb0937e67f691393f9ffdf75653e5128ea13Richard Smith if (!EvaluateAsInt(Value, Ctx)) 6663d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall llvm_unreachable("ICE cannot be evaluated!"); 6664d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall return true; 6665d905f5ad540c415d1a21b4f8b7bd715bfb7bb920John McCall} 66664c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 666770488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smithbool Expr::isCXX98IntegralConstantExpr(ASTContext &Ctx) const { 666870488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith return CheckICE(this, Ctx).Val == 0; 666970488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith} 667070488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith 66714c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smithbool Expr::isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result, 66724c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith SourceLocation *Loc) const { 66734c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // We support this checking in C++98 mode in order to diagnose compatibility 66744c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // issues. 66754c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith assert(Ctx.getLangOptions().CPlusPlus); 66764c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 667770488e201ccd94d4bb1ef0868cc13cca2b7d4ff6Richard Smith // Build evaluation settings. 66784c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Expr::EvalStatus Status; 66794c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 66804c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith Status.Diag = &Diags; 66814c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith EvalInfo Info(Ctx, Status); 66824c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66834c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith APValue Scratch; 66844c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith bool IsConstExpr = ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch); 66854c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66864c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (!Diags.empty()) { 66874c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith IsConstExpr = false; 66884c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = Diags[0].first; 66894c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } else if (!IsConstExpr) { 66904c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith // FIXME: This shouldn't happen. 66914c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith if (Loc) *Loc = getExprLoc(); 66924c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith } 66934c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith 66944c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith return IsConstExpr; 66954c3fc9b38d3723f73e4ded594cebf38c76f91d93Richard Smith} 6696745f5147e065900267c85a5568785a1991d4838fRichard Smith 6697745f5147e065900267c85a5568785a1991d4838fRichard Smithbool Expr::isPotentialConstantExpr(const FunctionDecl *FD, 6698745f5147e065900267c85a5568785a1991d4838fRichard Smith llvm::SmallVectorImpl< 6699745f5147e065900267c85a5568785a1991d4838fRichard Smith PartialDiagnosticAt> &Diags) { 6700745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: It would be useful to check constexpr function templates, but at the 6701745f5147e065900267c85a5568785a1991d4838fRichard Smith // moment the constant expression evaluator cannot cope with the non-rigorous 6702745f5147e065900267c85a5568785a1991d4838fRichard Smith // ASTs which we build for dependent expressions. 6703745f5147e065900267c85a5568785a1991d4838fRichard Smith if (FD->isDependentContext()) 6704745f5147e065900267c85a5568785a1991d4838fRichard Smith return true; 6705745f5147e065900267c85a5568785a1991d4838fRichard Smith 6706745f5147e065900267c85a5568785a1991d4838fRichard Smith Expr::EvalStatus Status; 6707745f5147e065900267c85a5568785a1991d4838fRichard Smith Status.Diag = &Diags; 6708745f5147e065900267c85a5568785a1991d4838fRichard Smith 6709745f5147e065900267c85a5568785a1991d4838fRichard Smith EvalInfo Info(FD->getASTContext(), Status); 6710745f5147e065900267c85a5568785a1991d4838fRichard Smith Info.CheckingPotentialConstantExpression = true; 6711745f5147e065900267c85a5568785a1991d4838fRichard Smith 6712745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); 6713745f5147e065900267c85a5568785a1991d4838fRichard Smith const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : 0; 6714745f5147e065900267c85a5568785a1991d4838fRichard Smith 6715745f5147e065900267c85a5568785a1991d4838fRichard Smith // FIXME: Fabricate an arbitrary expression on the stack and pretend that it 6716745f5147e065900267c85a5568785a1991d4838fRichard Smith // is a temporary being used as the 'this' pointer. 6717745f5147e065900267c85a5568785a1991d4838fRichard Smith LValue This; 6718745f5147e065900267c85a5568785a1991d4838fRichard Smith ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); 671983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith This.set(&VIE, Info.CurrentCall->Index); 6720745f5147e065900267c85a5568785a1991d4838fRichard Smith 6721745f5147e065900267c85a5568785a1991d4838fRichard Smith ArrayRef<const Expr*> Args; 6722745f5147e065900267c85a5568785a1991d4838fRichard Smith 6723745f5147e065900267c85a5568785a1991d4838fRichard Smith SourceLocation Loc = FD->getLocation(); 6724745f5147e065900267c85a5568785a1991d4838fRichard Smith 6725745f5147e065900267c85a5568785a1991d4838fRichard Smith if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { 672683587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith APValue Scratch; 6727745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleConstructorCall(Loc, This, Args, CD, Info, Scratch); 672883587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } else { 672983587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith CCValue Scratch; 6730745f5147e065900267c85a5568785a1991d4838fRichard Smith HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : 0, 6731745f5147e065900267c85a5568785a1991d4838fRichard Smith Args, FD->getBody(), Info, Scratch); 673283587db1bda97f45d2b5a4189e584e2a18be511aRichard Smith } 6733745f5147e065900267c85a5568785a1991d4838fRichard Smith 6734745f5147e065900267c85a5568785a1991d4838fRichard Smith return Diags.empty(); 6735745f5147e065900267c85a5568785a1991d4838fRichard Smith} 6736