CGExprAgg.cpp revision d97927d69b277120f8d403580c44acd84907d7b4
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); 77bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false, 78bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman unsigned Alignment = 0); 794ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 80410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall void EmitMoveFromReturnSlot(const Expr *E, RValue Src); 81fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 827c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::NeedsGCBarriers_t needsGC(QualType T) { 83e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor if (CGF.getLangOptions().getGC() && TypeRequiresGCollection(T)) 847c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall return AggValueSlot::NeedsGCBarriers; 857c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall return AggValueSlot::DoesNotNeedGCBarriers; 867c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall } 877c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall 88fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall bool TypeRequiresGCollection(QualType T); 89fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 90ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 91ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 92ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 949c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 95488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 969c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 979c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 98f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { 99f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne Visit(GE->getResultExpr()); 100f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 10112444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 10291a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { 10391a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return Visit(E->getReplacement()); 10491a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall } 1059c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1069c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 1079b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 1089b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 1099b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 1105be028f84243e0f6906c259e67cbdaf9bee431b2Daniel Dunbar void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 111751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); 1129b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 1139b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 1149b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 115f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 1161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 117f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 118f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 1191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 120f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 1211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1229c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 1234d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson void VisitCastExpr(CastExpr *E); 124148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 125b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 1269c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 1278bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 12803d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 12907fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 1309c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1318fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 1320a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 1330a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 1340a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 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 1514b9c2d235fb9449e249d74f48ecfec601650de93John McCall void VisitPseudoObjectExpr(PseudoObjectExpr *E) { 1524b9c2d235fb9449e249d74f48ecfec601650de93John McCall if (E->isGLValue()) { 1534b9c2d235fb9449e249d74f48ecfec601650de93John McCall LValue LV = CGF.EmitPseudoObjectLValue(E); 1544b9c2d235fb9449e249d74f48ecfec601650de93John McCall return EmitFinalDestCopy(E, LV); 1554b9c2d235fb9449e249d74f48ecfec601650de93John McCall } 1564b9c2d235fb9449e249d74f48ecfec601650de93John McCall 1574b9c2d235fb9449e249d74f48ecfec601650de93John McCall CGF.EmitPseudoObjectRValue(E, EnsureSlot(E->getType())); 1584b9c2d235fb9449e249d74f48ecfec601650de93John McCall } 1594b9c2d235fb9449e249d74f48ecfec601650de93John McCall 160b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 161f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 162a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitInitializationToLValue(Expr *E, LValue Address); 163a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitNullInitializationToLValue(LValue Address); 1649c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 16539406b1395f69341c045e863a6620310abdc55b6Mike Stump void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 166276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman void VisitAtomicExpr(AtomicExpr *E) { 167276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman CGF.EmitAtomicExpr(E, EnsureSlot(E->getType()).getAddr()); 168276b061970939293f1abaf694bd3ef05b2cbda79Eli Friedman } 1699c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1709c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1719c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 172ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 173ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 174ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1759c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 176883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 177883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 178883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1799c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1809c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1814ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1824ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1834ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 184fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief True if the given aggregate type requires special GC API calls. 185fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallbool AggExprEmitter::TypeRequiresGCollection(QualType T) { 186fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Only record types have members that might require garbage collection. 187fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall const RecordType *RecordTy = T->getAs<RecordType>(); 188fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (!RecordTy) return false; 189fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 190fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Don't mess with non-trivial C++ types. 191fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RecordDecl *Record = RecordTy->getDecl(); 192fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (isa<CXXRecordDecl>(Record) && 193fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || 194fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 195fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return false; 196fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 197fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Check whether the type has an object member. 198fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return Record->hasObjectMember(); 199fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 200fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 201410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// \brief Perform the final move to DestPtr if for some reason 202410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// getReturnValueSlot() didn't use it directly. 203fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// 204fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// The idea is that you do something like this: 205fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// RValue Result = EmitSomething(..., getReturnValueSlot()); 206410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// EmitMoveFromReturnSlot(E, Result); 207410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// 208410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// If nothing interferes, this will cause the result to be emitted 209410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// directly into the return value slot. Otherwise, a final move 210410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall/// will be performed. 211410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCallvoid AggExprEmitter::EmitMoveFromReturnSlot(const Expr *E, RValue Src) { 212410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall if (shouldUseDestForReturnSlot()) { 213410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // Logically, Dest.getAddr() should equal Src.getAggregateAddr(). 214410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // The possibility of undef rvalues complicates that a lot, 215410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // though, so we can't really assert. 216410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall return; 21755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 218410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall 219410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall // Otherwise, do a final copy, 220410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall assert(Dest.getAddr() != Src.getAggregateAddr()); 221410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitFinalDestCopy(E, Src, /*Ignore*/ true); 222fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 223fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 2244ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 225bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedmanvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore, 226bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman unsigned Alignment) { 2274ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 2284ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 229558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // If Dest is ignored, then we're evaluating an aggregate expression 230a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // in a context (like an expression statement) that doesn't care 231a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // about the result. C says that an lvalue-to-rvalue conversion is 232a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // performed in these cases; C++ says that it is not. In either 233a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // case, we don't actually need to do anything unless the value is 234a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // volatile. 235558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (Dest.isIgnored()) { 236a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall if (!Src.isVolatileQualified() || 237a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall CGF.CGM.getLangOptions().CPlusPlus || 238a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall (IgnoreResult && Ignore)) 2399ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 2408a97005f97a2a93fc2cd942c040668c5d4df7537Fariborz Jahanian 24149d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // If the source is volatile, we must read from it; to do that, we need 24249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // some place to put it. 243558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); 2449ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 245883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 246d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 247479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); 2482acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 249479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 25008c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 251558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.getAddr(), 252558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Src.getAggregateAddr(), 253558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall SizeVal); 25408c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian return; 25508c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian } 2564ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 2574ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 2584ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 2594ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 260558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), 261bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman Dest.isVolatile()|Src.isVolatileQualified(), 262bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman Alignment); 2634ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 2644ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2654ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 26649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 2674ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 2684ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 269bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman CharUnits Alignment = std::min(Src.getAlignment(), Dest.getAlignment()); 270bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman EmitFinalDestCopy(E, Src.asAggregateRValue(), Ignore, Alignment.getQuantity()); 271883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 272883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 273ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 274ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 275ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 276ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 27703e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregorvoid AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ 27803e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor Visit(E->GetTemporaryExpr()); 27903e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor} 28003e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 281e996ffd240f20a1048179d7727a6ee3227261921John McCallvoid AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { 28256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EmitFinalDestCopy(e, CGF.getOpaqueLValueMapping(e)); 283e996ffd240f20a1048179d7727a6ee3227261921John McCall} 284e996ffd240f20a1048179d7727a6ee3227261921John McCall 285751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregorvoid 286751ec9be961888f14342fb63b39bf8727f0dee49Douglas GregorAggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 287673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor if (E->getType().isPODType(CGF.getContext())) { 288673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // For a POD type, just emit a load of the lvalue + a copy, because our 289673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // compound literal might alias the destination. 290673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // FIXME: This is a band-aid; the real problem appears to be in our handling 291673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // of assignments, where we store directly into the LHS without checking 292673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // whether anything in the RHS aliases. 293673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor EmitAggLoadOfLValue(E); 294673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor return; 295673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor } 296673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor 297751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor AggValueSlot Slot = EnsureSlot(E->getType()); 298751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor CGF.EmitAggExpr(E->getInitializer(), Slot); 299751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor} 300751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 301751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 3024d8673b645ad86e496b886a0f80b60763f67071dAnders Carlssonvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 3033016842613674ab80796567239c15d529aff1458Anders Carlsson switch (E->getCastKind()) { 304575b374fdbfc2c2224fd3047ac11ffc4b8db9ae5Anders Carlsson case CK_Dynamic: { 30569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 30669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 30769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor // FIXME: Do we also need to handle property references here? 30869cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor if (LV.isSimple()) 30969cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 31069cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor else 31169cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 31269cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 313558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) 314558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 31569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor break; 31669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor } 31769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 3182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ToUnion: { 3196591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall if (Dest.isIgnored()) break; 3206591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall 3214d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson // GCC union extension 32279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType Ty = E->getSubExpr()->getType(); 32379c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType PtrTy = CGF.getContext().getPointerType(Ty); 324558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), 32534ebf4d1767e6748a1a59a5d1935c495cd8877e8Eli Friedman CGF.ConvertType(PtrTy)); 326a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getSubExpr(), 327a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.MakeAddrLValue(CastPtr, Ty)); 3283016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3297e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 3301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3312de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_DerivedToBase: 3322de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BaseToDerived: 3332de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UncheckedDerivedToBase: { 334b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("cannot perform hierarchy conversion in EmitAggExpr: " 3352d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor "should have been unpacked before we got here"); 3362d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor } 3372d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor 338f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_LValueToRValue: // hope for downstream optimization 3392de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_NoOp: 3402de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UserDefinedConversion: 3412de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ConstructorConversion: 3423016842613674ab80796567239c15d529aff1458Anders Carlsson assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 3433016842613674ab80796567239c15d529aff1458Anders Carlsson E->getType()) && 3443016842613674ab80796567239c15d529aff1458Anders Carlsson "Implicit cast types must be compatible"); 3453016842613674ab80796567239c15d529aff1458Anders Carlsson Visit(E->getSubExpr()); 3463016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3470ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall 3482de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_LValueBitCast: 3490ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); 350e39a3894513349908cdb3beba2614e53cb288e6cDouglas Gregor break; 3511de4d4e8cb2e9c88809fea8092bc6e835a5473d2John McCall 3520ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_Dependent: 3530ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BitCast: 3540ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ArrayToPointerDecay: 3550ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FunctionToPointerDecay: 3560ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToPointer: 3570ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToMemberPointer: 3580ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BaseToDerivedMemberPointer: 3590ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_DerivedToBaseMemberPointer: 3600ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_MemberPointerToBoolean: 3610ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToPointer: 3620ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToIntegral: 3630ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToBoolean: 3640ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ToVoid: 3650ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_VectorSplat: 3660ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralCast: 3670ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToBoolean: 3680ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToFloating: 3690ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToIntegral: 3700ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToBoolean: 3710ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingCast: 3721d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_CPointerToObjCPointerCast: 3731d9b3b25f7ac0d0195bba6b507a684fe5e7943eeJohn McCall case CK_BlockPointerToObjCPointerCast: 3740ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToBlockPointerCast: 3750ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ObjCObjectLValueCast: 3760ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingRealToComplex: 3770ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToReal: 3780ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToBoolean: 3790ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexCast: 3800ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToIntegralComplex: 3810ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralRealToComplex: 3820ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToReal: 3830ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToBoolean: 3840ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexCast: 3850ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToFloatingComplex: 38633e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCProduceObject: 38733e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCConsumeObject: 38833e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCReclaimReturnedObject: 38933e56f3273457bfa22c7c50bc46cf5a18216863dJohn McCall case CK_ARCExtendBlockObject: 3900ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("cast kind invalid for aggregate types"); 3913016842613674ab80796567239c15d529aff1458Anders Carlsson } 392e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 393e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 3949619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 395e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson if (E->getCallReturnType()->isReferenceType()) { 396e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson EmitAggLoadOfLValue(E); 397e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson return; 398e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson } 3991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 400fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); 401410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitMoveFromReturnSlot(E, RV); 402796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 4039619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 4049619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 405fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 406410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall EmitMoveFromReturnSlot(E, RV); 4078fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 408796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 4099619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 4102a41637a995affa1563f4d82a8b026e326a2faa0John McCall CGF.EmitIgnoredExpr(E->getLHS()); 411558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getRHS()); 41207fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 41307fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 414b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 415150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::StmtExprEvaluation eval(CGF); 416558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); 417b2d963f527674275c9109252474948368b6e6161Chris Lattner} 418b2d963f527674275c9109252474948368b6e6161Chris Lattner 4199c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 4202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) 4218bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian VisitPointerToDataMemberBinaryOperator(E); 4228bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian else 4238bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian CGF.ErrorUnsupported(E, "aggregate binary expression"); 4248bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian} 4258bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian 4268bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanianvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 4278bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian const BinaryOperator *E) { 4288bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 4298bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian EmitFinalDestCopy(E, LV); 430ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 431ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 43203d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 433ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 434ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 4352dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 4362dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman E->getRHS()->getType()) 437ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 438cd940a1e13e588a43973cd7ae33b5c33a3062739John McCall 4392c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getLHS())) 44073a6f8e8ad2174fb70cfb4c7d7afe424cfe8a147Fariborz Jahanian if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) 4412c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (VD->hasAttr<BlocksAttr>() && 4422c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian E->getRHS()->HasSideEffects(CGF.getContext())) { 4432c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // When __block variable on LHS, the RHS must be evaluated first 4442c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // as it may change the 'forwarding' field via call to Block_copy. 4452c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue RHS = CGF.EmitLValue(E->getRHS()); 4462c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue LHS = CGF.EmitLValue(E->getLHS()); 4477c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall Dest = AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, 4484418439220a8f8e0b1deffdccce2354854c702f5John McCall needsGC(E->getLHS()->getType()), 4494418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::IsAliased); 4502c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian EmitFinalDestCopy(E, RHS, true); 4512c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian return; 4522c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian } 4532c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian 4549c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 455883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 456db45806b991013280a03057025c9538de64d5dfbJohn McCall // Codegen the RHS so that it stores directly into the LHS. 457db45806b991013280a03057025c9538de64d5dfbJohn McCall AggValueSlot LHSSlot = 458db45806b991013280a03057025c9538de64d5dfbJohn McCall AggValueSlot::forLValue(LHS, AggValueSlot::IsDestructed, 459db45806b991013280a03057025c9538de64d5dfbJohn McCall needsGC(E->getLHS()->getType()), 460db45806b991013280a03057025c9538de64d5dfbJohn McCall AggValueSlot::IsAliased); 461db45806b991013280a03057025c9538de64d5dfbJohn McCall CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); 462db45806b991013280a03057025c9538de64d5dfbJohn McCall EmitFinalDestCopy(E, LHS, true); 463883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 464883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 46556ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallvoid AggExprEmitter:: 46656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallVisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { 4679615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 4689615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 4699615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 4701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47156ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // Bind the common expression if necessary. 472d97927d69b277120f8d403580c44acd84907d7b4Eli Friedman CodeGenFunction::OpaqueValueMapping binding(CGF, E); 47356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 474150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::ConditionalEvaluation eval(CGF); 4758e274bd14bcca8466542477844b88e90e90cde1aEli Friedman CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 4761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47774fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // Save whether the destination's lifetime is externally managed. 478fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall bool isExternallyDestructed = Dest.isExternallyDestructed(); 479883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 480150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 481150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(LHSBlock); 48256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getTrueExpr()); 483150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 4841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 485150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); 486150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.Builder.CreateBr(ContBlock); 4871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48874fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // If the result of an agg expression is unused, then the emission 48974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // of the LHS might need to create a destination slot. That's fine 49074fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // with us, and we can safely emit the RHS into the same slot, but 491fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // we shouldn't claim that it's already being destructed. 492fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall Dest.setExternallyDestructed(isExternallyDestructed); 49374fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall 494150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 495150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(RHSBlock); 49656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getFalseExpr()); 497150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 4981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4999c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 500883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 501ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 502a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlssonvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 503a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson Visit(CE->getChosenSubExpr(CGF.getContext())); 504a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson} 505a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson 506b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 5070785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 508ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 509ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 5100262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 511ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 5120262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 5130262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 5140262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 51579c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); 516b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 517b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 518b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlssonvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 519558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Ensure that we have a slot, but if we already do, remember 520fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // whether it was externally destructed. 521fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall bool wasExternallyDestructed = Dest.isExternallyDestructed(); 522558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = EnsureSlot(E->getType()); 523fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall 524fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // We're going to push a destructor if there isn't already one. 525fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall Dest.setExternallyDestructed(); 526558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 527558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getSubExpr()); 528558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 529fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall // Push that destructor we promised. 530fd71fb81c5f9382caf0131946e890b133e12ceb5John McCall if (!wasExternallyDestructed) 53186811609d9353e3aed198045d56e790eb3b6118cPeter Collingbourne CGF.EmitCXXTemporary(E->getTemporary(), E->getType(), Dest.getAddr()); 532b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson} 533b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson 534b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 53531ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 536558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(E->getType()); 537558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXConstructExpr(E, Slot); 5387f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson} 5397f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 5404765fa05b5652fcc4356371c2f481d0ea9a1b007John McCallvoid AggExprEmitter::VisitExprWithCleanups(ExprWithCleanups *E) { 5411a343ebbf413e8eae6b2737b2b2d79cbf5765571John McCall CGF.enterFullExpression(E); 5421a343ebbf413e8eae6b2737b2b2d79cbf5765571John McCall CodeGenFunction::RunCleanupsScope cleanups(CGF); 5431a343ebbf413e8eae6b2737b2b2d79cbf5765571John McCall Visit(E->getSubExpr()); 544b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 545b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 546ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregorvoid AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { 547558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 548558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 549a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 55030311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson} 55130311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson 55230311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlssonvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 553558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 554558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 555a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 556329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes} 557329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes 5581b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// isSimpleZero - If emitting this value will obviously just cause a store of 5591b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zero to memory, return true. This can return false if uncertain, so it just 5601b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// handles simple cases. 5611b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { 562f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 563f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 5641b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 5651b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) 5661b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return IL->getValue() == 0; 5671b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // +0.0 5681b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) 5691b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return FL->getValue().isPosZero(); 5701b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // int() 5711b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && 5721b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 5731b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return true; 5741b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // (int*)0 - Null pointer expressions. 5751b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) 5761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return ICE->getCastKind() == CK_NullToPointer; 5771b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // '\0' 5781b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) 5791b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return CL->getValue() == 0; 5801b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5811b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Otherwise, hard case: conservatively return false. 5821b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return false; 5831b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 5841b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 58678e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlssonvoid 587a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 588a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = LV.getType(); 5897f79f9be5916c51c35da4f126b7c12596a101607Mike Stump // FIXME: Ignore result? 590f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 5911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Dest.isZeroed() && isSimpleZero(E, CGF)) { 5921b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Storing "i32 0" to a zero'd memory location is a noop. 5931b726771d00762fb5c4c2638e60d134c385493aeChris Lattner } else if (isa<ImplicitValueInitExpr>(E)) { 594a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(LV); 595a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isReferenceType()) { 59632f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); 597545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RV, LV); 598a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isAnyComplexType()) { 5993498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 600a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (CGF.hasAggregateLLVMType(type)) { 6017c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, 6027c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::IsDestructed, 6037c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall AggValueSlot::DoesNotNeedGCBarriers, 604410ffb2bc5f072d58a73c14560345bcf77dec1ccJohn McCall AggValueSlot::IsNotAliased, 605a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall Dest.isZeroed())); 606f85e193739c953358c865005855253af4f68a497John McCall } else if (LV.isSimple()) { 607a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false); 608c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 609545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); 610f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 611f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 612305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 613a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallvoid AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { 614a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = lv.getType(); 615a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall 6161b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the destination slot is already zeroed out before the aggregate is 6171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // copied into it, we don't have to emit any zeros here. 618a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) 6191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 6201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 621a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (!CGF.hasAggregateLLVMType(type)) { 622f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 623a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type)); 624545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(null), lv); 625f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 626f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 627f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 628f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 629a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); 630f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 631f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 632305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 633f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 634a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 63513a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // FIXME: Assess perf here? Figure out what cases are worth optimizing here 63613a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // (Length of globals? Chunks of zeroed-out space?). 637a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 638f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 639f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 64013a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 641994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 64213a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 64313a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman llvm::GlobalValue::InternalLinkage, C, ""); 64479c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); 645994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 646994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 647a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 648d0db03a561671b8b466b07026cc8fbbb037bb639Chris Lattner if (E->hadArrayRangeDesignator()) 649a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 650a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 651558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *DestPtr = Dest.getAddr(); 652558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 653f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 654f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 6552acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *APType = 656f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 6572acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::ArrayType *AType = 658f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 660f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 661922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 6629619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 6639619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 6649619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 6652dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 6669619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 6679619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 6689619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 669922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 670922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 671f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 672bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(NumInitElements <= NumArrayElements); 673bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 674bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType elementType = E->getType().getCanonicalType(); 675bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType = CGF.getContext().getQualifiedType( 676bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cast<ArrayType>(elementType)->getElementType(), 677bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType.getQualifiers() + Dest.getQualifiers()); 678bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 679bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // DestPtr is an array*. Construct an elementType* by drilling 680bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // down a level. 681bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); 682bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *indices[] = { zero, zero }; 683bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *begin = 6840f6ac7cf7bc6a02c1a5c19d2c90ec0d1dd7786e7Jay Foad Builder.CreateInBoundsGEP(DestPtr, indices, "arrayinit.begin"); 685bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 686bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Exception safety requires us to destroy all the 687bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // already-constructed members if an initializer throws. 688bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // For that, we'll need an EH cleanup. 689bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType::DestructionKind dtorKind = elementType.isDestructedType(); 690bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::AllocaInst *endOfInit = 0; 691bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EHScopeStack::stable_iterator cleanup; 6926f103ba42cb69d50005a977c5ea583984ab63fc4John McCall llvm::Instruction *cleanupDominator = 0; 693bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CGF.needsEHCleanup(dtorKind)) { 694bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // In principle we could tell the cleanup where we are more 695bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // directly, but the control flow can get so varied here that it 696bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // would actually be quite complex. Therefore we go through an 697bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // alloca. 698bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall endOfInit = CGF.CreateTempAlloca(begin->getType(), 699bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.endOfInit"); 7006f103ba42cb69d50005a977c5ea583984ab63fc4John McCall cleanupDominator = Builder.CreateStore(begin, endOfInit); 7012673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, 7022673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.getDestroyer(dtorKind)); 703bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cleanup = CGF.EHStack.stable_begin(); 704bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 705bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Otherwise, remember that we didn't need a cleanup. 706bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } else { 707bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall dtorKind = QualType::DK_none; 708bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 7093b4d490b09347e0b68ec0511ddfae79dfaba77a6Argyrios Kyrtzidis 710bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); 711bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 712bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // The 'current element to initialize'. The invariants on this 713bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // variable are complicated. Essentially, after each iteration of 714bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // the loop, it points to the last initialized element, except 715bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // that it points to the beginning of the array before any 716bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // elements have been initialized. 717bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *element = begin; 718bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 719bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the explicit initializers. 720bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall for (uint64_t i = 0; i != NumInitElements; ++i) { 721bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the next element. 7222673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (i > 0) { 723bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); 724bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 7252673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the cleanup that it needs to destroy up to this 7262673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // element. TODO: some of these stores can be trivially 7272673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // observed to be unnecessary. 7282673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7292673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 7302673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 731bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(element, elementType); 732bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(E->getInit(i), elementLV); 733bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 734bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 735bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Check whether there's a non-trivial array-fill expression. 736bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Note that this will be a CXXConstructExpr even if the element 737bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // type is an array (or array of array, etc.) of class type. 738bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Expr *filler = E->getArrayFiller(); 739bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall bool hasTrivialFiller = true; 740bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CXXConstructExpr *cons = dyn_cast_or_null<CXXConstructExpr>(filler)) { 741bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(cons->getConstructor()->isDefaultConstructor()); 742bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall hasTrivialFiller = cons->getConstructor()->isTrivial(); 743bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 744bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 745bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Any remaining elements need to be zero-initialized, possibly 746bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // using the filler expression. We can skip this if the we're 747bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // emitting to zeroed memory. 748bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (NumInitElements != NumArrayElements && 749bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall !(Dest.isZeroed() && hasTrivialFiller && 750bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.getTypes().isZeroInitializable(elementType))) { 751bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 752bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Use an actual loop. This is basically 753bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // do { *array++ = filler; } while (array != end); 754bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 755bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the start of the rest of the array. 7562673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (NumInitElements) { 757bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); 7582673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7592673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 760bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 761bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Compute the end of the array. 762bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *end = Builder.CreateInBoundsGEP(begin, 763bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), 764bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.end"); 765bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 766bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); 767bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); 768bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 769bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Jump into the body. 770bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(bodyBB); 771bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::PHINode *currentElement = 772bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); 773bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(element, entryBB); 774bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 775bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the actual filler expression. 776bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(currentElement, elementType); 777bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (filler) 778bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(filler, elementLV); 779f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 780bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitNullInitializationToLValue(elementLV); 781bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 782bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Move on to the next element. 783bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *nextElement = 784bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); 785bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 7862673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the EH cleanup that we finished with the last element. 7872673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(nextElement, endOfInit); 7882673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 789bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the loop if we're done. 790bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, 791bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.done"); 792bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); 793bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateCondBr(done, endBB, bodyBB); 794bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); 795bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 796bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(endBB); 797f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 798bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 799bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the partial-array cleanup if we entered one. 8006f103ba42cb69d50005a977c5ea583984ab63fc4John McCall if (dtorKind) CGF.DeactivateCleanupBlock(cleanup, cleanupDominator); 801bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 802305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 803f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 8041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 805f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 8061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 807f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 808f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 809f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 810f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 811f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 8122b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); 813bd7de38eae1fc20ee88db63f469c54241bc240f8Chris Lattner 8142b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (record->isUnion()) { 8150bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 8160bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 8170bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 8180bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 8191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8200bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 8210bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 8220bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 8232b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator Field = record->field_begin(), 8242b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall FieldEnd = record->field_end(); 8250bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 8260bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 8270bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 8280bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8290bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8300bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8310bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 8320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 8330bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 8350bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 8360bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 837a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getInit(0), FieldLoc); 8380bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 8391b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Default-initialize to null. 840a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(FieldLoc); 8410bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8420bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8430bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8440bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8462b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We'll need to enter cleanup scopes in case any of the member 8472b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initializers throw an exception. 8485f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<EHScopeStack::stable_iterator, 16> cleanups; 8496f103ba42cb69d50005a977c5ea583984ab63fc4John McCall llvm::Instruction *cleanupDominator = 0; 8502b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 851f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 852f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 8532b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall unsigned curInitIndex = 0; 8542b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator field = record->field_begin(), 8552b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall fieldEnd = record->field_end(); 8562b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall field != fieldEnd; ++field) { 8572b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done once we hit the flexible array member. 8582b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->getType()->isIncompleteArrayType()) 85944b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 86044b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 8612b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Always skip anonymous bitfields. 8622b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->isUnnamedBitfield()) 863f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 86434e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 8652b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done if we reach the end of the explicit initializers, we 8662b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // have a zeroed object, and the rest of the fields are 8672b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // zero-initializable. 8682b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex == NumInitElements && Dest.isZeroed() && 8691b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 8701b726771d00762fb5c4c2638e60d134c385493aeChris Lattner break; 8711b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8721e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 8732b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LValue LV = CGF.EmitLValueForFieldInitialization(DestPtr, *field, 0); 87414674ffb81dccbc4e1bf78ab5b7987685819b445Fariborz Jahanian // We never generate write-barries for initialized fields. 8752b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LV.setNonGC(true); 8761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8772b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex < NumInitElements) { 878b35baae19b906245b5c2266b47ef411abcc6b25aChris Lattner // Store the initializer into the field. 8792b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitInitializationToLValue(E->getInit(curInitIndex++), LV); 880f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 881f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 8822b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitNullInitializationToLValue(LV); 8832b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 8842b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 8852b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Push a destructor if necessary. 8862b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // FIXME: if we have an array of structures, all explicitly 8872b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initialized, we can end up pushing a linear number of cleanups. 8882b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall bool pushedCleanup = false; 8892b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (QualType::DestructionKind dtorKind 8902b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall = field->getType().isDestructedType()) { 8912b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall assert(LV.isSimple()); 8922b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (CGF.needsEHCleanup(dtorKind)) { 8936f103ba42cb69d50005a977c5ea583984ab63fc4John McCall if (!cleanupDominator) 8946f103ba42cb69d50005a977c5ea583984ab63fc4John McCall cleanupDominator = CGF.Builder.CreateUnreachable(); // placeholder 8956f103ba42cb69d50005a977c5ea583984ab63fc4John McCall 8962b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), 8972b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.getDestroyer(dtorKind), false); 8982b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall cleanups.push_back(CGF.EHStack.stable_begin()); 8992b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall pushedCleanup = true; 9002b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 901f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 9021b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9031b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the GEP didn't get used because of a dead zero init or something 9041b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // else, clean it up for -O0 builds and general tidiness. 9052b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (!pushedCleanup && LV.isSimple()) 9061b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (llvm::GetElementPtrInst *GEP = 9072b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall dyn_cast<llvm::GetElementPtrInst>(LV.getAddress())) 9081b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (GEP->use_empty()) 9091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner GEP->eraseFromParent(); 910145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 9112b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 9122b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Deactivate all the partial cleanups in reverse order, which 9132b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // generally means popping them. 9142b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (unsigned i = cleanups.size(); i != 0; --i) 9156f103ba42cb69d50005a977c5ea583984ab63fc4John McCall CGF.DeactivateCleanupBlock(cleanups[i-1], cleanupDominator); 9166f103ba42cb69d50005a977c5ea583984ab63fc4John McCall 9176f103ba42cb69d50005a977c5ea583984ab63fc4John McCall // Destroy the placeholder if we made one. 9186f103ba42cb69d50005a977c5ea583984ab63fc4John McCall if (cleanupDominator) 9196f103ba42cb69d50005a977c5ea583984ab63fc4John McCall cleanupDominator->eraseFromParent(); 920636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 921636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 922ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 923ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 924ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 925ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 9261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// GetNumNonZeroBytesInInit - Get an approximate count of the number of 9271b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// non-zero bytes that will be stored when outputting the initializer for the 9281b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// specified initializer expression. 92902c45333b8310bb792a15f85f219706025f9752cKen Dyckstatic CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { 930f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 9311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9321b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 and 0.0 won't require any non-zero stores! 93302c45333b8310bb792a15f85f219706025f9752cKen Dyck if (isSimpleZero(E, CGF)) return CharUnits::Zero(); 9341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9351b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If this is an initlist expr, sum up the size of sizes of the (present) 9361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // elements. If this is something weird, assume the whole thing is non-zero. 9371b726771d00762fb5c4c2638e60d134c385493aeChris Lattner const InitListExpr *ILE = dyn_cast<InitListExpr>(E); 9381b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) 93902c45333b8310bb792a15f85f219706025f9752cKen Dyck return CGF.getContext().getTypeSizeInChars(E->getType()); 9401b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 941d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // InitListExprs for structs have to be handled carefully. If there are 942d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // reference members, we need to consider the size of the reference, not the 943d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // referencee. InitListExprs for unions and arrays can't have references. 9448c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (const RecordType *RT = E->getType()->getAs<RecordType>()) { 9458c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (!RT->isUnionType()) { 9468c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 94702c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 948d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9498c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner unsigned ILEElement = 0; 9508c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner for (RecordDecl::field_iterator Field = SD->field_begin(), 9518c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { 9528c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // We're done once we hit the flexible array member or run out of 9538c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // InitListExpr elements. 9548c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isIncompleteArrayType() || 9558c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner ILEElement == ILE->getNumInits()) 9568c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner break; 9578c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->isUnnamedBitfield()) 9588c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner continue; 9598c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9608c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner const Expr *E = ILE->getInit(ILEElement++); 9618c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9628c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // Reference values are always non-null and have the width of a pointer. 9638c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isReferenceType()) 96402c45333b8310bb792a15f85f219706025f9752cKen Dyck NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( 965bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor CGF.getContext().getTargetInfo().getPointerWidth(0)); 9668c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner else 9678c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); 9688c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner } 969d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9708c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner return NumNonZeroBytes; 971d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 972d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 973d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 974d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 97502c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 9761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) 9771b726771d00762fb5c4c2638e60d134c385493aeChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); 9781b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return NumNonZeroBytes; 9791b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 9801b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9811b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// CheckAggExprForMemSetUse - If the initializer is large and has a lot of 9821b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zeros in it, emit a memset and avoid storing the individual zeros. 9831b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// 9841b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, 9851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CodeGenFunction &CGF) { 9861b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the slot is already known to be zeroed, nothing to do. Don't mess with 9871b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // volatile stores. 9881b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; 989657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 990657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis // C++ objects with a user-declared constructor don't need zero'ing. 991657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (CGF.getContext().getLangOptions().CPlusPlus) 992657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (const RecordType *RT = CGF.getContext() 993657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis .getBaseElementType(E->getType())->getAs<RecordType>()) { 994657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 995657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (RD->hasUserDeclaredConstructor()) 996657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis return; 997657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis } 998657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 9991b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the type is 16-bytes or smaller, prefer individual stores over memset. 10005ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck std::pair<CharUnits, CharUnits> TypeInfo = 10015ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.getContext().getTypeInfoInChars(E->getType()); 10025ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (TypeInfo.first <= CharUnits::fromQuantity(16)) 10031b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 10041b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10051b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Check to see if over 3/4 of the initializer are known to be zero. If so, 10061b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // we prefer to emit memset + individual stores for the rest. 10075ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); 10085ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (NumNonZeroBytes*4 > TypeInfo.first) 10091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 10101b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Okay, it seems like a good idea to use an initial memset, emit the call. 10125ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first.getQuantity()); 10135ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits Align = TypeInfo.second; 10141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::Value *Loc = Slot.getAddr(); 10162acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); 10171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Loc = CGF.Builder.CreateBitCast(Loc, BP); 10195ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, 10205ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck Align.getQuantity(), false); 10211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Tell the AggExprEmitter that the slot is known zero. 10231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Slot.setZeroed(); 10241b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 10251b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10271b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10281b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 1029e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// EmitAggExpr - Emit the computation of the specified expression of aggregate 1030e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// type. The result is computed into DestPtr. Note that if DestPtr is null, 1031e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// the value of the aggregate expression is not needed. If VolatileDest is 1032e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// true, DestPtr cannot be 0. 1033558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// 1034558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// \param IsInitializer - true if this evaluation is initializing an 1035558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// object whose lifetime is already being managed. 1036558d2abc7f9fd6801cc7677200992313ae90b5d8John McCallvoid CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, 1037474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool IgnoreResult) { 1038ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 1039ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 10401b726771d00762fb5c4c2638e60d134c385493aeChris Lattner assert((Slot.getAddr() != 0 || Slot.isIgnored()) && 10411b726771d00762fb5c4c2638e60d134c385493aeChris Lattner "slot has bits but no address"); 10421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10431b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Optimize the slot if possible. 10441b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CheckAggExprForMemSetUse(Slot, E, *this); 10451b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10461b726771d00762fb5c4c2638e60d134c385493aeChris Lattner AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); 1047ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 10487482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 104918aba0dd518e486d8b50523e7dafb4b5657135d2Daniel DunbarLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 105018aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 1051195337d2e5d4625ae9dc1328c7cdbc7115b0261bDaniel Dunbar llvm::Value *Temp = CreateMemTemp(E->getType()); 105279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar LValue LV = MakeAddrLValue(Temp, E->getType()); 10537c2349be2d11143a2e59a167fd43362a3bf4585eJohn McCall EmitAggExpr(E, AggValueSlot::forLValue(LV, AggValueSlot::IsNotDestructed, 10544418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::DoesNotNeedGCBarriers, 10554418439220a8f8e0b1deffdccce2354854c702f5John McCall AggValueSlot::IsNotAliased)); 105679c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar return LV; 105718aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar} 105818aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar 10597482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 106027fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump llvm::Value *SrcPtr, QualType Ty, 1061bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman bool isVolatile, unsigned Alignment) { 10627482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 10631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10640d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (getContext().getLangOptions().CPlusPlus) { 10650d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (const RecordType *RT = Ty->getAs<RecordType>()) { 1066e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 1067e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor assert((Record->hasTrivialCopyConstructor() || 1068b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialCopyAssignment() || 1069b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialMoveConstructor() || 1070b2b5658a8e4ad566303ec98caceaa3485e7635f7Douglas Gregor Record->hasTrivialMoveAssignment()) && 1071e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "Trying to aggregate-copy a type without a trivial copy " 1072e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "constructor or assignment operator"); 1073419aa964ae845aa5b1183fabb2f1cff78faaedddDouglas Gregor // Ignore empty classes in C++. 1074e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor if (Record->isEmpty()) 10750d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson return; 10760d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10770d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10780d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson 107983c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 1080ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 1081ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 1082ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 1083ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 1084ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 108583c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 1086ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 1087ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 1088ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 10891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10907482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 10911a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck std::pair<CharUnits, CharUnits> TypeInfo = 10921a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck getContext().getTypeInfoInChars(Ty); 10931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1094bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman if (!Alignment) 1095bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman Alignment = TypeInfo.second.getQuantity(); 1096bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman 10977482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 10981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1099fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 1100fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 1101fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1102fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 1103fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1104fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 1105fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1106fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1107fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 1108fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 11093ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang // we need to use a different call here. We use isVolatile to indicate when 111049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // either the source or the destination is volatile. 11113ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 11122acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 11132acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *DBP = 1114d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); 1115578faa837b552403e2002b97fdfbfde14f2448e5Benjamin Kramer DestPtr = Builder.CreateBitCast(DestPtr, DBP); 11163ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 11172acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 11182acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SBP = 1119d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); 1120578faa837b552403e2002b97fdfbfde14f2448e5Benjamin Kramer SrcPtr = Builder.CreateBitCast(SrcPtr, SBP); 11213ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 1122f85e193739c953358c865005855253af4f68a497John McCall // Don't do any of the memmove_collectable tests if GC isn't set. 1123e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor if (CGM.getLangOptions().getGC() == LangOptions::NonGC) { 1124f85e193739c953358c865005855253af4f68a497John McCall // fall through 1125f85e193739c953358c865005855253af4f68a497John McCall } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { 112655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian RecordDecl *Record = RecordTy->getDecl(); 112755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (Record->hasObjectMember()) { 11281a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11292acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11301a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 113155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 113255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 113355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 113455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 1135f85e193739c953358c865005855253af4f68a497John McCall } else if (Ty->isArrayType()) { 113655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian QualType BaseType = getContext().getBaseElementType(Ty); 113755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { 113855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (RecordTy->getDecl()->hasObjectMember()) { 11391a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11402acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11411a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = 11421a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(SizeTy, size.getQuantity()); 114355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 114455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 114555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 114655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 114755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 114855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 114955bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian 11509f0c7cc36d29cf591c33962931f5862847145f3eBenjamin Kramer Builder.CreateMemCpy(DestPtr, SrcPtr, 11511a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(IntPtrTy, 11521a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck TypeInfo.first.getQuantity()), 1153bd7d82878c1588afccbee6c68fa6e17bbbab7f2cEli Friedman Alignment, isVolatile); 11547482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 1155