1566b6ce741c742cc3f8cb85e2376ec4a3490ff5fChris Lattner//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// 2af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// 3af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// The LLVM Compiler Infrastructure 4af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 7af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// 8af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner//===----------------------------------------------------------------------===// 9af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// 10af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// This contains code to emit Aggregate Expr nodes as LLVM code. 11af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner// 12af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner//===----------------------------------------------------------------------===// 13af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner 14af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattner#include "CodeGenFunction.h" 15883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner#include "CodeGenModule.h" 16082b02e8403d3ee9d2ded969fbe0e5d472f04cd8Fariborz Jahanian#include "CGObjCRuntime.h" 17de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/ASTContext.h" 18b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson#include "clang/AST/DeclCXX.h" 19de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/StmtVisitor.h" 20883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner#include "llvm/Constants.h" 21883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner#include "llvm/Function.h" 22636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel#include "llvm/GlobalVariable.h" 23f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner#include "llvm/Intrinsics.h" 24af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattnerusing namespace clang; 25af6f528b2bd6c3ee517e02d346238addb74159ccChris Lattnerusing namespace CodeGen; 26883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 279c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner//===----------------------------------------------------------------------===// 289c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner// Aggregate Expression Emitter 299c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner//===----------------------------------------------------------------------===// 309c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 319c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnernamespace { 3285b4521e34dcd4a0a4a1f0819e1123128e5a3125Benjamin Kramerclass AggExprEmitter : public StmtVisitor<AggExprEmitter> { 339c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CodeGenFunction &CGF; 3445d196b8387dcefc4df26cda114fa34c6528e928Daniel Dunbar CGBuilderTy &Builder; 35558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Dest; 3649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump bool IgnoreResult; 37ef072fd2f3347cfd857d6eb787b245b950771430John McCall 38410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall /// We want to use 'dest' as the return slot except under two 39410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall /// conditions: 40410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall /// - The destination slot requires garbage collection, so we 41410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall /// need to use the GC API. 42410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall /// - The destination slot is potentially aliased. 43410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall bool shouldUseDestForReturnSlot() const { 44410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall return !(Dest.requiresGCollection() || Dest.isPotentiallyAliased()); 45410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall } 46410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall 47ef072fd2f3347cfd857d6eb787b245b950771430John McCall ReturnValueSlot getReturnValueSlot() const { 48410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall if (!shouldUseDestForReturnSlot()) 49410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall return ReturnValueSlot(); 50fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 51558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall return ReturnValueSlot(Dest.getAddr(), Dest.isVolatile()); 52558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall } 53558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 54558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot EnsureSlot(QualType T) { 55558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) return Dest; 56558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall return CGF.CreateAggTemp(T, "agg.tmp.ensured"); 57ef072fd2f3347cfd857d6eb787b245b950771430John McCall } 58fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 599c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnerpublic: 60558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, 61474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool ignore) 62558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall : CGF(cgf), Builder(CGF.Builder), Dest(Dest), 63474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian IgnoreResult(ignore) { 649c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 659c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 66ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 67ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Utilities 68ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 69ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 709c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// EmitAggLoadOfLValue - Given an expression with aggregate type that 719c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// represents a value lvalue, this method emits the address of the lvalue, 729c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// then loads the result into DestPtr. 739c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void EmitAggLoadOfLValue(const Expr *E); 74922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 754ac20ddc7ab324a59862657f756bdd060076b137Mike Stump /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 7649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 7749d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 784ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 79410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall void EmitMoveFromReturnSlot(const Expr *E, RValue Src); 80fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 817c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { 82e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor if (CGF.getLangOptions().getGC() && TypeRequiresGCollection(T)) 837c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall return AggValueSlot::NeedsGCBarriers; 847c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall return AggValueSlot::DoesNotNeedGCBarriers; 857c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall } 867c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall 87fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall bool TypeRequiresGCollection(QualType T); 88fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 89ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 90ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 91ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 939c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 94488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 959c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 969c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 97f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { 98f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne Visit(GE->getResultExpr()); 99f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 10012444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 10191a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { 10291a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return Visit(E->getReplacement()); 10391a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall } 1049c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1059c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 1069b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 1079b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 1089b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 1095be028f84243e0f6906c259e67cbdaf9bee431b2Daniel Dunbar void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 110751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); 1119b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 1129b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 1139b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 114f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 1151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 116f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 117f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 1181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 119f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 1201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1219c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 1224d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson void VisitCastExpr(CastExpr *E); 123148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 124b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 1259c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 1268bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 12703d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 12807fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 1299c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1308fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 1310a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 1320a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 1330a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 1349c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 1351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO); 137a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson void VisitChooseExpr(const ChooseExpr *CE); 138636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 13930311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 14004421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 14104421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 14204421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 143b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 14431ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 1454765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall void VisitExprWithCleanups(ExprWithCleanups *E); 146ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); 1472710c4159ff4761ba9867aca18f60a178b297686Mike Stump void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 14803e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E); 149e996ffd240f20a1048179d7727a6ee3227261921John McCall void VisitOpaqueValueExpr(OpaqueValueExpr *E); 150e996ffd240f20a1048179d7727a6ee3227261921John McCall 151b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 152f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 153a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitInitializationToLValue(Expr *E, LValue Address); 154a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitNullInitializationToLValue(LValue Address); 1559c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 15639406b1395f69341c045e863a6620310abdc55b6Mike Stump void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 157276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman void VisitAtomicExpr(AtomicExpr *E) { 158276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman CGF.EmitAtomicExpr(E, EnsureSlot(E->getType()).getAddr()); 159276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 1609c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1619c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1629c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 163ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 164ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 165ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1669c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 167883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 168883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 169883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1709c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1719c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1724ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1734ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1744ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 175fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief True if the given aggregate type requires special GC API calls. 176fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallbool AggExprEmitter::TypeRequiresGCollection(QualType T) { 177fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Only record types have members that might require garbage collection. 178fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall const RecordType *RecordTy = T->getAs<RecordType>(); 179fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (!RecordTy) return false; 180fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 181fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Don't mess with non-trivial C++ types. 182fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RecordDecl *Record = RecordTy->getDecl(); 183fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (isa<CXXRecordDecl>(Record) && 184fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || 185fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 186fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return false; 187fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 188fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Check whether the type has an object member. 189fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return Record->hasObjectMember(); 190fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 191fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 192410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// \brief Perform the final move to DestPtr if for some reason 193410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// getReturnValueSlot() didn't use it directly. 194fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// 195fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// The idea is that you do something like this: 196fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// RValue Result = EmitSomething(..., getReturnValueSlot()); 197410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// EmitMoveFromReturnSlot(E, Result); 198410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// 199410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// If nothing interferes, this will cause the result to be emitted 200410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// directly into the return value slot. Otherwise, a final move 201410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// will be performed. 202410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCallvoid AggExprEmitter::EmitMoveFromReturnSlot(const Expr *E, RValue Src) { 203410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall if (shouldUseDestForReturnSlot()) { 204410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // Logically, Dest.getAddr() should equal Src.getAggregateAddr(). 205410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // The possibility of undef rvalues complicates that a lot, 206410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // though, so we can't really assert. 207410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall return; 20855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 209410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall 210410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // Otherwise, do a final copy, 211410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall assert(Dest.getAddr() != Src.getAggregateAddr()); 212410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitFinalDestCopy(E, Src, /*Ignore*/ true); 213fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 214fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 2154ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 21649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 2174ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 2184ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 219558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // If Dest is ignored, then we're evaluating an aggregate expression 220a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // in a context (like an expression statement) that doesn't care 221a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // about the result. C says that an lvalue-to-rvalue conversion is 222a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // performed in these cases; C++ says that it is not. In either 223a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // case, we don't actually need to do anything unless the value is 224a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // volatile. 225558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (Dest.isIgnored()) { 226a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall if (!Src.isVolatileQualified() || 227a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall CGF.CGM.getLangOptions().CPlusPlus || 228a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall (IgnoreResult && Ignore)) 2299ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 2308a97005f97a2a93fc2cd942c040668c5d4df7537Fariborz Jahanian 23149d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // If the source is volatile, we must read from it; to do that, we need 23249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // some place to put it. 233558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); 2349ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 235883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 236d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 237479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); 2382acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 239479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 24008c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 241558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.getAddr(), 242558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Src.getAggregateAddr(), 243558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall SizeVal); 24408c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian return; 24508c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian } 2464ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 2474ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 2484ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 2494ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 250558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), 251558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.isVolatile()|Src.isVolatileQualified()); 2524ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 2534ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2544ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 25549d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 2564ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 2574ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2584ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 25949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Src.isVolatileQualified()), 26049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Ignore); 261883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 262883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 263ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 264ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 265ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 266ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 26703e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregorvoid AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ 26803e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor Visit(E->GetTemporaryExpr()); 26903e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor} 27003e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 271e996ffd240f20a1048179d7727a6ee3227261921John McCallvoid AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { 27256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EmitFinalDestCopy(e, CGF.getOpaqueLValueMapping(e)); 273e996ffd240f20a1048179d7727a6ee3227261921John McCall} 274e996ffd240f20a1048179d7727a6ee3227261921John McCall 275751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregorvoid 276751ec9be961888f14342fb63b39bf8727f0dee49Douglas GregorAggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 277673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor if (E->getType().isPODType(CGF.getContext())) { 278673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // For a POD type, just emit a load of the lvalue + a copy, because our 279673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // compound literal might alias the destination. 280673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // FIXME: This is a band-aid; the real problem appears to be in our handling 281673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // of assignments, where we store directly into the LHS without checking 282673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // whether anything in the RHS aliases. 283673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor EmitAggLoadOfLValue(E); 284673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor return; 285673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor } 286673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor 287751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor AggValueSlot Slot = EnsureSlot(E->getType()); 288751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor CGF.EmitAggExpr(E->getInitializer(), Slot); 289751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor} 290751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 291751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 2924d8673b645ad86e496b886a0f80b60763f67071dAnders Carlssonvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 2933016842613674ab80796567239c15d529aff1458Anders Carlsson switch (E->getCastKind()) { 294575b374fdbfc2c2224fd3047ac11ffc4b8db9ae5Anders Carlsson case CK_Dynamic: { 29569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 29669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 29769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor // FIXME: Do we also need to handle property references here? 29869cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor if (LV.isSimple()) 29969cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 30069cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor else 30169cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 30269cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 303558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) 304558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 30569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor break; 30669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor } 30769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 3082de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ToUnion: { 3096591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall if (Dest.isIgnored()) break; 3106591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall 3114d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson // GCC union extension 31279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType Ty = E->getSubExpr()->getType(); 31379c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType PtrTy = CGF.getContext().getPointerType(Ty); 314558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), 31534ebf4d1767e6748a1a59a5d1935c495cd8877e8Eli Friedman CGF.ConvertType(PtrTy)); 316a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getSubExpr(), 317a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.MakeAddrLValue(CastPtr, Ty)); 3183016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3197e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 3201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3212de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_DerivedToBase: 3222de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BaseToDerived: 3232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UncheckedDerivedToBase: { 324b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: " 3252d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor "should have been unpacked before we got here"); 3262d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor } 3272d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor 328f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_GetObjCProperty: { 329f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall LValue LV = CGF.EmitLValue(E->getSubExpr()); 330f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall assert(LV.isPropertyRef()); 331f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall RValue RV = CGF.EmitLoadOfPropertyRefLValue(LV, getReturnValueSlot()); 332410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitMoveFromReturnSlot(E, RV); 333f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall break; 334f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall } 335f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 336f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_LValueToRValue: // hope for downstream optimization 3372de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_NoOp: 3382de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UserDefinedConversion: 3392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ConstructorConversion: 3403016842613674ab80796567239c15d529aff1458Anders Carlsson assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 3413016842613674ab80796567239c15d529aff1458Anders Carlsson E->getType()) && 3423016842613674ab80796567239c15d529aff1458Anders Carlsson "Implicit cast types must be compatible"); 3433016842613674ab80796567239c15d529aff1458Anders Carlsson Visit(E->getSubExpr()); 3443016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3450ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall 3462de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_LValueBitCast: 3470ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); 348e39a3894513349908cdb3beba2614e53cb288e6cDouglas Gregor break; 3491de4d4e8cb2e9c88809fea8092bc6e835a5473d2John McCall 3500ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_Dependent: 3510ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BitCast: 3520ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ArrayToPointerDecay: 3530ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FunctionToPointerDecay: 3540ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToPointer: 3550ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToMemberPointer: 3560ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BaseToDerivedMemberPointer: 3570ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_DerivedToBaseMemberPointer: 3580ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_MemberPointerToBoolean: 3590ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToPointer: 3600ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToIntegral: 3610ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToBoolean: 3620ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ToVoid: 3630ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_VectorSplat: 3640ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralCast: 3650ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToBoolean: 3660ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToFloating: 3670ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToIntegral: 3680ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToBoolean: 3690ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingCast: 3701d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3711d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 3720ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToBlockPointerCast: 3730ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ObjCObjectLValueCast: 3740ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingRealToComplex: 3750ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToReal: 3760ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToBoolean: 3770ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexCast: 3780ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToIntegralComplex: 3790ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralRealToComplex: 3800ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToReal: 3810ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToBoolean: 3820ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexCast: 3830ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToFloatingComplex: 38433e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 38533e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 38633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 38733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 3880ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("cast kind invalid for aggregate types"); 3893016842613674ab80796567239c15d529aff1458Anders Carlsson } 390e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 391e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 3929619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 393e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson if (E->getCallReturnType()->isReferenceType()) { 394e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson EmitAggLoadOfLValue(E); 395e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson return; 396e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson } 3971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 398fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); 399410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitMoveFromReturnSlot(E, RV); 400796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 4019619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 4029619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 403fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 404410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitMoveFromReturnSlot(E, RV); 4058fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 406796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 4079c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 408f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall llvm_unreachable("direct property access not surrounded by " 409f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall "lvalue-to-rvalue cast"); 4105daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 4115daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 4129619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 4132a41637a995affa1563f4d82a8b026e326a2faa0John McCall CGF.EmitIgnoredExpr(E->getLHS()); 414558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getRHS()); 41507fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 41607fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 417b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 418150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::StmtExprEvaluation eval(CGF); 419558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); 420b2d963f527674275c9109252474948368b6e6161Chris Lattner} 421b2d963f527674275c9109252474948368b6e6161Chris Lattner 4229c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 4232de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) 4248bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian VisitPointerToDataMemberBinaryOperator(E); 4258bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian else 4268bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian CGF.ErrorUnsupported(E, "aggregate binary expression"); 4278bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian} 4288bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian 4298bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanianvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 4308bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian const BinaryOperator *E) { 4318bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 4328bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian EmitFinalDestCopy(E, LV); 433ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 434ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 43503d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 436ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 437ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 4382dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 4392dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman E->getRHS()->getType()) 440ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 441cd940a1e13e588a43973cd7ae33b5c33a3062739John McCall 4422c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getLHS())) 44373a6f8e8ad2174fb70cfb4c7d7afe424cfe8a147Fariborz Jahanian if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) 4442c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (VD->hasAttr<BlocksAttr>() && 4452c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian E->getRHS()->HasSideEffects(CGF.getContext())) { 4462c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // When __block variable on LHS, the RHS must be evaluated first 4472c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // as it may change the 'forwarding' field via call to Block_copy. 4482c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue RHS = CGF.EmitLValue(E->getRHS()); 4492c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue LHS = CGF.EmitLValue(E->getLHS()); 4507c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall Dest = AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, 4514418439220a8f8e0b1deffdccce2354854c702f5John McCall needsGC(E->getLHS()->getType()), 4524418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::IsAliased); 4532c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian EmitFinalDestCopy(E, RHS, true); 4542c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian return; 4552c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian } 4562c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian 4579c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 458883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 4597f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 4607f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 4617f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 46268af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian const ObjCPropertyRefExpr *RE = LHS.getPropertyRefExpr(); 46368af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian QualType ArgType = RE->getSetterArgType(); 46468af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian RValue Src; 46568af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian if (ArgType->isReferenceType()) 46668af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian Src = CGF.EmitReferenceBindingToExpr(E->getRHS(), 0); 46768af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian else { 46868af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian AggValueSlot Slot = EnsureSlot(E->getRHS()->getType()); 46968af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian CGF.EmitAggExpr(E->getRHS(), Slot); 47068af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian Src = Slot.asRValue(); 47168af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian } 47268af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian CGF.EmitStoreThroughPropertyRefLValue(Src, LHS); 4737f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 4747f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 4757c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot LHSSlot = 4767c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, 4774418439220a8f8e0b1deffdccce2354854c702f5John McCall needsGC(E->getLHS()->getType()), 4784418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::IsAliased); 479474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); 48049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump EmitFinalDestCopy(E, LHS, true); 4817f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 482883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 483883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 48456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallvoid AggExprEmitter:: 48556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallVisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { 4869615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 4879615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 4889615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 4891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49056ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // Bind the common expression if necessary. 49156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall CodeGenFunction::OpaqueValueMapping binding(CGF, E); 49256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 493150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::ConditionalEvaluation eval(CGF); 4948e274bd14bcca8466542477844b88e90e90cde1aEli Friedman CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 4951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49674fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // Save whether the destination's lifetime is externally managed. 497fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall bool isExternallyDestructed = Dest.isExternallyDestructed(); 498883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 499150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 500150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(LHSBlock); 50156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getTrueExpr()); 502150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 5031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 504150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); 505150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.Builder.CreateBr(ContBlock); 5061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 50774fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // If the result of an agg expression is unused, then the emission 50874fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // of the LHS might need to create a destination slot. That's fine 50974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // with us, and we can safely emit the RHS into the same slot, but 510fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // we shouldn't claim that it's already being destructed. 511fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall Dest.setExternallyDestructed(isExternallyDestructed); 51274fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall 513150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 514150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(RHSBlock); 51556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getFalseExpr()); 516150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 5171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5189c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 519883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 520ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 521a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlssonvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 522a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson Visit(CE->getChosenSubExpr(CGF.getContext())); 523a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson} 524a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson 525b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 5260785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 527ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 528ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 5290262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 530ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 5310262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 5320262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 5330262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 53479c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); 535b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 536b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 537b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlssonvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 538558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Ensure that we have a slot, but if we already do, remember 539fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // whether it was externally destructed. 540fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall bool wasExternallyDestructed = Dest.isExternallyDestructed(); 541558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = EnsureSlot(E->getType()); 542fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall 543fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // We're going to push a destructor if there isn't already one. 544fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall Dest.setExternallyDestructed(); 545558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 546558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getSubExpr()); 547558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 548fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // Push that destructor we promised. 549fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall if (!wasExternallyDestructed) 550558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXTemporary(E->getTemporary(), Dest.getAddr()); 551b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson} 552b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson 553b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 55431ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 555558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(E->getType()); 556558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXConstructExpr(E, Slot); 5577f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson} 5587f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 5594765fa05b5652fcc4356371c2f481d0ea9a1b007John McCallvoid AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { 5604765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall CGF.EmitExprWithCleanups(E, Dest); 561b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 562b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 563ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregorvoid AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { 564558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 565558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 566a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 56730311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson} 56830311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson 56930311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlssonvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 570558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 571558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 572a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 573329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes} 574329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes 5751b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// isSimpleZero - If emitting this value will obviously just cause a store of 5761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zero to memory, return true. This can return false if uncertain, so it just 5771b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// handles simple cases. 5781b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { 579f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 580f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 5811b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 5821b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) 5831b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return IL->getValue() == 0; 5841b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // +0.0 5851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) 5861b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return FL->getValue().isPosZero(); 5871b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // int() 5881b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && 5891b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 5901b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return true; 5911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // (int*)0 - Null pointer expressions. 5921b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) 5931b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return ICE->getCastKind() == CK_NullToPointer; 5941b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // '\0' 5951b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) 5961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return CL->getValue() == 0; 5971b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5981b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Otherwise, hard case: conservatively return false. 5991b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return false; 6001b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 6011b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 6021b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 60378e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlssonvoid 604a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 605a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = LV.getType(); 6067f79f9be5916c51c35da4f126b7c12596a101607Mike Stump // FIXME: Ignore result? 607f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 6081b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Dest.isZeroed() && isSimpleZero(E, CGF)) { 6091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Storing "i32 0" to a zero'd memory location is a noop. 6101b726771d00762fb5c4c2638e60d134c385493aeChris Lattner } else if (isa<ImplicitValueInitExpr>(E)) { 611a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(LV); 612a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isReferenceType()) { 61332f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); 614545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RV, LV); 615a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isAnyComplexType()) { 6163498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 617a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (CGF.hasAggregateLLVMType(type)) { 6187c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, 6197c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::IsDestructed, 6207c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::DoesNotNeedGCBarriers, 621410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall AggValueSlot::IsNotAliased, 622a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall Dest.isZeroed())); 623f85e193739c953358c865005855253af4f68a497John McCall } else if (LV.isSimple()) { 624a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false); 625c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 626545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); 627f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 628f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 629305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 630a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallvoid AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { 631a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = lv.getType(); 632a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall 6331b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the destination slot is already zeroed out before the aggregate is 6341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // copied into it, we don't have to emit any zeros here. 635a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) 6361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 6371b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 638a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (!CGF.hasAggregateLLVMType(type)) { 639f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 640a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type)); 641545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(null), lv); 642f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 643f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 644f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 645f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 646a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); 647f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 648f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 649305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 650f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 651a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 65213a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // FIXME: Assess perf here? Figure out what cases are worth optimizing here 65313a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // (Length of globals? Chunks of zeroed-out space?). 654a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 655f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 656f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 65713a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 658994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 65913a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 66013a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman llvm::GlobalValue::InternalLinkage, C, ""); 66179c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); 662994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 663994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 664a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 665d0db03a561671b8b466b07026cc8fbbb037bb639Chris Lattner if (E->hadArrayRangeDesignator()) 666a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 667a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 668558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *DestPtr = Dest.getAddr(); 669558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 670f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 671f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 6722acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *APType = 673f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 6742acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::ArrayType *AType = 675f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 6761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 677f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 678922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 6799619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 6809619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 6819619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 6822dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 6839619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 6849619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 6859619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 686922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 687922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 688f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 689bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(NumInitElements <= NumArrayElements); 690bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 691bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType elementType = E->getType().getCanonicalType(); 692bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType = CGF.getContext().getQualifiedType( 693bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cast<ArrayType>(elementType)->getElementType(), 694bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType.getQualifiers() + Dest.getQualifiers()); 695bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 696bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // DestPtr is an array*. Construct an elementType* by drilling 697bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // down a level. 698bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); 699bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *indices[] = { zero, zero }; 700bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *begin = 7010f6ac7cf7bc6a02c1a5c19d2c90ec0d1dd7786e7Jay Foad Builder.CreateInBoundsGEP(DestPtr, indices, "arrayinit.begin"); 702bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 703bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Exception safety requires us to destroy all the 704bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // already-constructed members if an initializer throws. 705bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // For that, we'll need an EH cleanup. 706bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType::DestructionKind dtorKind = elementType.isDestructedType(); 707bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::AllocaInst *endOfInit = 0; 708bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EHScopeStack::stable_iterator cleanup; 709bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CGF.needsEHCleanup(dtorKind)) { 710bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // In principle we could tell the cleanup where we are more 711bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // directly, but the control flow can get so varied here that it 712bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // would actually be quite complex. Therefore we go through an 713bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // alloca. 714bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall endOfInit = CGF.CreateTempAlloca(begin->getType(), 715bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.endOfInit"); 716bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateStore(begin, endOfInit); 7172673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, 7182673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.getDestroyer(dtorKind)); 719bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cleanup = CGF.EHStack.stable_begin(); 720bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 721bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Otherwise, remember that we didn't need a cleanup. 722bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } else { 723bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall dtorKind = QualType::DK_none; 724bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 7253b4d490b09347e0b68ec0511ddfae79dfaba77a6Argyrios Kyrtzidis 726bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); 727bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 728bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // The 'current element to initialize'. The invariants on this 729bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // variable are complicated. Essentially, after each iteration of 730bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // the loop, it points to the last initialized element, except 731bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // that it points to the beginning of the array before any 732bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // elements have been initialized. 733bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *element = begin; 734bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 735bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the explicit initializers. 736bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall for (uint64_t i = 0; i != NumInitElements; ++i) { 737bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the next element. 7382673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (i > 0) { 739bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); 740bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 7412673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the cleanup that it needs to destroy up to this 7422673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // element. TODO: some of these stores can be trivially 7432673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // observed to be unnecessary. 7442673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7452673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 7462673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 747bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(element, elementType); 748bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(E->getInit(i), elementLV); 749bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 750bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 751bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Check whether there's a non-trivial array-fill expression. 752bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Note that this will be a CXXConstructExpr even if the element 753bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // type is an array (or array of array, etc.) of class type. 754bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Expr *filler = E->getArrayFiller(); 755bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall bool hasTrivialFiller = true; 756bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CXXConstructExpr *cons = dyn_cast_or_null<CXXConstructExpr>(filler)) { 757bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(cons->getConstructor()->isDefaultConstructor()); 758bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall hasTrivialFiller = cons->getConstructor()->isTrivial(); 759bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 760bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 761bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Any remaining elements need to be zero-initialized, possibly 762bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // using the filler expression. We can skip this if the we're 763bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // emitting to zeroed memory. 764bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (NumInitElements != NumArrayElements && 765bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall !(Dest.isZeroed() && hasTrivialFiller && 766bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.getTypes().isZeroInitializable(elementType))) { 767bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 768bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Use an actual loop. This is basically 769bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // do { *array++ = filler; } while (array != end); 770bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 771bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the start of the rest of the array. 7722673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (NumInitElements) { 773bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); 7742673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7752673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 776bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 777bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Compute the end of the array. 778bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *end = Builder.CreateInBoundsGEP(begin, 779bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), 780bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.end"); 781bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 782bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); 783bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); 784bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 785bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Jump into the body. 786bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(bodyBB); 787bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::PHINode *currentElement = 788bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); 789bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(element, entryBB); 790bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 791bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the actual filler expression. 792bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(currentElement, elementType); 793bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (filler) 794bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(filler, elementLV); 795f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 796bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitNullInitializationToLValue(elementLV); 797bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 798bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Move on to the next element. 799bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *nextElement = 800bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); 801bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 8022673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the EH cleanup that we finished with the last element. 8032673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(nextElement, endOfInit); 8042673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 805bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the loop if we're done. 806bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, 807bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.done"); 808bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); 809bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateCondBr(done, endBB, bodyBB); 810bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); 811bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 812bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(endBB); 813f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 814bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 815bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the partial-array cleanup if we entered one. 816bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (dtorKind) CGF.DeactivateCleanupBlock(cleanup); 817bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 818305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 819f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 8201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 821f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 8221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 823f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 824f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 825f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 826f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 827f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 8282b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); 829bd7de38eae1fc20ee88db63f469c54241bc240f8Chris Lattner 8302b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (record->isUnion()) { 8310bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 8320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 8330bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 8340bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 8351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8360bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 8370bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 8380bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 8392b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator Field = record->field_begin(), 8402b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall FieldEnd = record->field_end(); 8410bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 8420bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 8430bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 8440bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8450bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8460bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8470bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 8480bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 8490bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8501b726771d00762fb5c4c2638e60d134c385493aeChris Lattner LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 8510bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 8520bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 853a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getInit(0), FieldLoc); 8540bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 8551b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Default-initialize to null. 856a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(FieldLoc); 8570bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8580bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8590bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8600bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8622b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We'll need to enter cleanup scopes in case any of the member 8632b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initializers throw an exception. 8645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<EHScopeStack::stable_iterator, 16> cleanups; 8652b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 866f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 867f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 8682b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall unsigned curInitIndex = 0; 8692b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator field = record->field_begin(), 8702b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall fieldEnd = record->field_end(); 8712b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall field != fieldEnd; ++field) { 8722b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done once we hit the flexible array member. 8732b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->getType()->isIncompleteArrayType()) 87444b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 87544b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 8762b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Always skip anonymous bitfields. 8772b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->isUnnamedBitfield()) 878f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 87934e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 8802b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done if we reach the end of the explicit initializers, we 8812b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // have a zeroed object, and the rest of the fields are 8822b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // zero-initializable. 8832b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex == NumInitElements && Dest.isZeroed() && 8841b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 8851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner break; 8861b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8871e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 8882b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LValue LV = CGF.EmitLValueForFieldInitialization(DestPtr, *field, 0); 88914674ffb81dccbc4e1bf78ab5b7987685819b445Fariborz Jahanian // We never generate write-barries for initialized fields. 8902b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LV.setNonGC(true); 8911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8922b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex < NumInitElements) { 893b35baae19b906245b5c2266b47ef411abcc6b25aChris Lattner // Store the initializer into the field. 8942b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitInitializationToLValue(E->getInit(curInitIndex++), LV); 895f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 896f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 8972b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitNullInitializationToLValue(LV); 8982b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 8992b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 9002b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Push a destructor if necessary. 9012b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // FIXME: if we have an array of structures, all explicitly 9022b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initialized, we can end up pushing a linear number of cleanups. 9032b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall bool pushedCleanup = false; 9042b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (QualType::DestructionKind dtorKind 9052b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall = field->getType().isDestructedType()) { 9062b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall assert(LV.isSimple()); 9072b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (CGF.needsEHCleanup(dtorKind)) { 9082b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), 9092b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.getDestroyer(dtorKind), false); 9102b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall cleanups.push_back(CGF.EHStack.stable_begin()); 9112b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall pushedCleanup = true; 9122b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 913f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 9141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the GEP didn't get used because of a dead zero init or something 9161b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // else, clean it up for -O0 builds and general tidiness. 9172b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (!pushedCleanup && LV.isSimple()) 9181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (llvm::GetElementPtrInst *GEP = 9192b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall dyn_cast<llvm::GetElementPtrInst>(LV.getAddress())) 9201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (GEP->use_empty()) 9211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner GEP->eraseFromParent(); 922145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 9232b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 9242b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Deactivate all the partial cleanups in reverse order, which 9252b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // generally means popping them. 9262b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (unsigned i = cleanups.size(); i != 0; --i) 9272b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.DeactivateCleanupBlock(cleanups[i-1]); 928636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 929636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 930ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 931ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 932ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 933ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 9341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// GetNumNonZeroBytesInInit - Get an approximate count of the number of 9351b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// non-zero bytes that will be stored when outputting the initializer for the 9361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// specified initializer expression. 93702c45333b8310bb792a15f85f219706025f9752cKen Dyckstatic CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { 938f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 9391b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9401b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 and 0.0 won't require any non-zero stores! 94102c45333b8310bb792a15f85f219706025f9752cKen Dyck if (isSimpleZero(E, CGF)) return CharUnits::Zero(); 9421b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9431b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If this is an initlist expr, sum up the size of sizes of the (present) 9441b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // elements. If this is something weird, assume the whole thing is non-zero. 9451b726771d00762fb5c4c2638e60d134c385493aeChris Lattner const InitListExpr *ILE = dyn_cast<InitListExpr>(E); 9461b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) 94702c45333b8310bb792a15f85f219706025f9752cKen Dyck return CGF.getContext().getTypeSizeInChars(E->getType()); 9481b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 949d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // InitListExprs for structs have to be handled carefully. If there are 950d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // reference members, we need to consider the size of the reference, not the 951d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // referencee. InitListExprs for unions and arrays can't have references. 9528c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (const RecordType *RT = E->getType()->getAs<RecordType>()) { 9538c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (!RT->isUnionType()) { 9548c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 95502c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 956d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9578c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner unsigned ILEElement = 0; 9588c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner for (RecordDecl::field_iterator Field = SD->field_begin(), 9598c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { 9608c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // We're done once we hit the flexible array member or run out of 9618c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // InitListExpr elements. 9628c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isIncompleteArrayType() || 9638c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner ILEElement == ILE->getNumInits()) 9648c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner break; 9658c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->isUnnamedBitfield()) 9668c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner continue; 9678c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9688c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner const Expr *E = ILE->getInit(ILEElement++); 9698c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9708c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // Reference values are always non-null and have the width of a pointer. 9718c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isReferenceType()) 97202c45333b8310bb792a15f85f219706025f9752cKen Dyck NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( 973bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor CGF.getContext().getTargetInfo().getPointerWidth(0)); 9748c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner else 9758c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); 9768c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner } 977d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9788c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner return NumNonZeroBytes; 979d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 980d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 981d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 982d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 98302c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 9841b726771d00762fb5c4c2638e60d134c385493aeChris Lattner for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) 9851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); 9861b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return NumNonZeroBytes; 9871b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 9881b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9891b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// CheckAggExprForMemSetUse - If the initializer is large and has a lot of 9901b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zeros in it, emit a memset and avoid storing the individual zeros. 9911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// 9921b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, 9931b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CodeGenFunction &CGF) { 9941b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the slot is already known to be zeroed, nothing to do. Don't mess with 9951b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // volatile stores. 9961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; 997657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 998657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis // C++ objects with a user-declared constructor don't need zero'ing. 999657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (CGF.getContext().getLangOptions().CPlusPlus) 1000657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (const RecordType *RT = CGF.getContext() 1001657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis .getBaseElementType(E->getType())->getAs<RecordType>()) { 1002657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1003657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (RD->hasUserDeclaredConstructor()) 1004657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis return; 1005657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis } 1006657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 10071b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the type is 16-bytes or smaller, prefer individual stores over memset. 10085ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck std::pair<CharUnits, CharUnits> TypeInfo = 10095ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.getContext().getTypeInfoInChars(E->getType()); 10105ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (TypeInfo.first <= CharUnits::fromQuantity(16)) 10111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 10121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10131b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Check to see if over 3/4 of the initializer are known to be zero. If so, 10141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // we prefer to emit memset + individual stores for the rest. 10155ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); 10165ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (NumNonZeroBytes*4 > TypeInfo.first) 10171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 10181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Okay, it seems like a good idea to use an initial memset, emit the call. 10205ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first.getQuantity()); 10215ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits Align = TypeInfo.second; 10221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::Value *Loc = Slot.getAddr(); 10242acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); 10251b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Loc = CGF.Builder.CreateBitCast(Loc, BP); 10275ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, 10285ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck Align.getQuantity(), false); 10291b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10301b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Tell the AggExprEmitter that the slot is known zero. 10311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Slot.setZeroed(); 10321b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 10331b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10351b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 1037e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// EmitAggExpr - Emit the computation of the specified expression of aggregate 1038e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// type. The result is computed into DestPtr. Note that if DestPtr is null, 1039e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// the value of the aggregate expression is not needed. If VolatileDest is 1040e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// true, DestPtr cannot be 0. 1041558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// 1042558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// \param IsInitializer - true if this evaluation is initializing an 1043558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// object whose lifetime is already being managed. 1044558d2abc7f9fd6801cc7677200992313ae90b5d8John McCallvoid CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, 1045474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool IgnoreResult) { 1046ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 1047ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 10481b726771d00762fb5c4c2638e60d134c385493aeChris Lattner assert((Slot.getAddr() != 0 || Slot.isIgnored()) && 10491b726771d00762fb5c4c2638e60d134c385493aeChris Lattner "slot has bits but no address"); 10501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10511b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Optimize the slot if possible. 10521b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CheckAggExprForMemSetUse(Slot, E, *this); 10531b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10541b726771d00762fb5c4c2638e60d134c385493aeChris Lattner AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); 1055ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 10567482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 105718aba0dd518e486d8b50523e7dafb4b5657135d2Daniel DunbarLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 105818aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 1059195337d2e5d4625ae9dc1328c7cdbc7115b0261bDaniel Dunbar llvm::Value *Temp = CreateMemTemp(E->getType()); 106079c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar LValue LV = MakeAddrLValue(Temp, E->getType()); 10617c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall EmitAggExpr(E, AggValueSlot::forLValue(LV, AggValueSlot::IsNotDestructed, 10624418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::DoesNotNeedGCBarriers, 10634418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::IsNotAliased)); 106479c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar return LV; 106518aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar} 106618aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar 10677482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 106827fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump llvm::Value *SrcPtr, QualType Ty, 106927fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump bool isVolatile) { 10707482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 10711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10720d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (getContext().getLangOptions().CPlusPlus) { 10730d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (const RecordType *RT = Ty->getAs<RecordType>()) { 1074e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 1075e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor assert((Record->hasTrivialCopyConstructor() || 1076b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialCopyAssignment() || 1077b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialMoveConstructor() || 1078b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialMoveAssignment()) && 1079e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "Trying to aggregate-copy a type without a trivial copy " 1080e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "constructor or assignment operator"); 1081419aa964ae845aa5b1183fabb2f1cff78faaedddDouglas Gregor // Ignore empty classes in C++. 1082e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor if (Record->isEmpty()) 10830d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson return; 10840d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10850d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10860d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson 108783c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 1088ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 1089ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 1090ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 1091ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 1092ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 109383c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 1094ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 1095ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 1096ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 10971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10987482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 10991a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck std::pair<CharUnits, CharUnits> TypeInfo = 11001a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck getContext().getTypeInfoInChars(Ty); 11011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11027482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 11031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1104fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 1105fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 1106fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1107fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 1108fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1109fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 1110fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1111fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1112fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 1113fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 11143ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang // we need to use a different call here. We use isVolatile to indicate when 111549d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // either the source or the destination is volatile. 11163ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 11172acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 11182acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *DBP = 1119d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); 1120578faa837b552403e2002b97fdfbfde14f2448e5Benjamin Kramer DestPtr = Builder.CreateBitCast(DestPtr, DBP); 11213ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 11222acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 11232acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SBP = 1124d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); 1125578faa837b552403e2002b97fdfbfde14f2448e5Benjamin Kramer SrcPtr = Builder.CreateBitCast(SrcPtr, SBP); 11263ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 1127f85e193739c953358c865005855253af4f68a497John McCall // Don't do any of the memmove_collectable tests if GC isn't set. 1128e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor if (CGM.getLangOptions().getGC() == LangOptions::NonGC) { 1129f85e193739c953358c865005855253af4f68a497John McCall // fall through 1130f85e193739c953358c865005855253af4f68a497John McCall } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { 113155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian RecordDecl *Record = RecordTy->getDecl(); 113255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (Record->hasObjectMember()) { 11331a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11342acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11351a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 113655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 113755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 113855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 113955bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 1140f85e193739c953358c865005855253af4f68a497John McCall } else if (Ty->isArrayType()) { 114155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian QualType BaseType = getContext().getBaseElementType(Ty); 114255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { 114355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (RecordTy->getDecl()->hasObjectMember()) { 11441a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11452acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11461a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = 11471a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(SizeTy, size.getQuantity()); 114855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 114955bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 115055bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 115155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 115255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 115355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 115455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian 11559f0c7cc36d29cf591c33962931f5862847145f3eBenjamin Kramer Builder.CreateMemCpy(DestPtr, SrcPtr, 11561a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(IntPtrTy, 11571a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck TypeInfo.first.getQuantity()), 11581a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck TypeInfo.second.getQuantity(), isVolatile); 11597482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 1160