CGExprAgg.cpp revision 2acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2d
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 38ef072fd2f3347cfd857d6eb787b245b950771430John McCall ReturnValueSlot getReturnValueSlot() const { 39fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // If the destination slot requires garbage collection, we can't 40fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // use the real return value slot, because we have to use the GC 41fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // API. 42d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) return ReturnValueSlot(); 43fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 44558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall return ReturnValueSlot(Dest.getAddr(), Dest.isVolatile()); 45558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall } 46558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 47558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot EnsureSlot(QualType T) { 48558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) return Dest; 49558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall return CGF.CreateAggTemp(T, "agg.tmp.ensured"); 50ef072fd2f3347cfd857d6eb787b245b950771430John McCall } 51fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 529c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnerpublic: 53558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggExprEmitter(CodeGenFunction &cgf, AggValueSlot Dest, 54474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool ignore) 55558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall : CGF(cgf), Builder(CGF.Builder), Dest(Dest), 56474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian IgnoreResult(ignore) { 579c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 589c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 59ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 60ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Utilities 61ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 62ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 639c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// EmitAggLoadOfLValue - Given an expression with aggregate type that 649c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// represents a value lvalue, this method emits the address of the lvalue, 659c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// then loads the result into DestPtr. 669c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void EmitAggLoadOfLValue(const Expr *E); 67922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 684ac20ddc7ab324a59862657f756bdd060076b137Mike Stump /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 6949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 7049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 714ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 72fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall void EmitGCMove(const Expr *E, RValue Src); 73fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 74fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall bool TypeRequiresGCollection(QualType T); 75fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 76ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 77ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 78ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 809c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 81488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 829c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 839c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 84f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne void VisitGenericSelectionExpr(GenericSelectionExpr *GE) { 85f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne Visit(GE->getResultExpr()); 86f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne } 8712444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 8891a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall void VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) { 8991a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall return Visit(E->getReplacement()); 9091a5755ad73c5dc1dfb167e448fdd74e75a6df56John McCall } 919c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 929c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 939b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 949b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 959b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 965be028f84243e0f6906c259e67cbdaf9bee431b2Daniel Dunbar void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 97751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor void VisitCompoundLiteralExpr(CompoundLiteralExpr *E); 989b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 999b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 1009b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 101f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 1021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 103f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 104f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 1051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 106f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 1071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1089c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 1094d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson void VisitCastExpr(CastExpr *E); 110148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 111b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 1129c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 1138bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 11403d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 11507fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 1169c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1178fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 1180a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 1190a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 1200a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 1219c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 1221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall void VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO); 124a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson void VisitChooseExpr(const ChooseExpr *CE); 125636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 12630311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 12704421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 12804421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 12904421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 130b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 13131ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 1324765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall void VisitExprWithCleanups(ExprWithCleanups *E); 133ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); 1342710c4159ff4761ba9867aca18f60a178b297686Mike Stump void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 13503e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor void VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E); 136e996ffd240f20a1048179d7727a6ee3227261921John McCall void VisitOpaqueValueExpr(OpaqueValueExpr *E); 137e996ffd240f20a1048179d7727a6ee3227261921John McCall 138b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 139f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 140a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitInitializationToLValue(Expr *E, LValue Address); 141a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall void EmitNullInitializationToLValue(LValue Address); 1429c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 14339406b1395f69341c045e863a6620310abdc55b6Mike Stump void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 1449c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1459c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1469c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 147ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 148ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 149ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1509c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 151883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 152883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 153883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1549c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1559c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1564ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1574ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1584ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 159fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief True if the given aggregate type requires special GC API calls. 160fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallbool AggExprEmitter::TypeRequiresGCollection(QualType T) { 161fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Only record types have members that might require garbage collection. 162fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall const RecordType *RecordTy = T->getAs<RecordType>(); 163fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (!RecordTy) return false; 164fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 165fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Don't mess with non-trivial C++ types. 166fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RecordDecl *Record = RecordTy->getDecl(); 167fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (isa<CXXRecordDecl>(Record) && 168fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || 169fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 170fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return false; 171fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 172fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Check whether the type has an object member. 173fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return Record->hasObjectMember(); 174fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 175fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 176fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief Perform the final move to DestPtr if RequiresGCollection is set. 177fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// 178fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// The idea is that you do something like this: 179fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// RValue Result = EmitSomething(..., getReturnValueSlot()); 180fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// EmitGCMove(E, Result); 181fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// If GC doesn't interfere, this will cause the result to be emitted 182fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// directly into the return value slot. If GC does interfere, a final 183fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// move will be performed. 184fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallvoid AggExprEmitter::EmitGCMove(const Expr *E, RValue Src) { 185d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 186479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); 1872acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 188479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 189558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, Dest.getAddr(), 190fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall Src.getAggregateAddr(), 19155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 19255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 193fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 194fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 1954ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 19649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 1974ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 1984ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 199558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // If Dest is ignored, then we're evaluating an aggregate expression 200a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // in a context (like an expression statement) that doesn't care 201a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // about the result. C says that an lvalue-to-rvalue conversion is 202a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // performed in these cases; C++ says that it is not. In either 203a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // case, we don't actually need to do anything unless the value is 204a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // volatile. 205558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (Dest.isIgnored()) { 206a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall if (!Src.isVolatileQualified() || 207a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall CGF.CGM.getLangOptions().CPlusPlus || 208a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall (IgnoreResult && Ignore)) 2099ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 2108a97005f97a2a93fc2cd942c040668c5d4df7537Fariborz Jahanian 21149d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // If the source is volatile, we must read from it; to do that, we need 21249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // some place to put it. 213558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); 2149ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 215883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 216d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 217479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck CharUnits size = CGF.getContext().getTypeSizeInChars(E->getType()); 2182acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 219479b61ccd8cd847281eef0b43e6873f0930f1b98Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 22008c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 221558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.getAddr(), 222558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Src.getAggregateAddr(), 223558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall SizeVal); 22408c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian return; 22508c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian } 2264ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 2274ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 2284ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 2294ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 230558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), 231558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.isVolatile()|Src.isVolatileQualified()); 2324ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 2334ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2344ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 23549d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 2364ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 2374ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2384ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 23949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Src.isVolatileQualified()), 24049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Ignore); 241883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 242883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 243ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 244ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 245ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 246ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 24703e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregorvoid AggExprEmitter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E){ 24803e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor Visit(E->GetTemporaryExpr()); 24903e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor} 25003e80030515c800d1ab44125b9052dfffd1bd04cDouglas Gregor 251e996ffd240f20a1048179d7727a6ee3227261921John McCallvoid AggExprEmitter::VisitOpaqueValueExpr(OpaqueValueExpr *e) { 25256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall EmitFinalDestCopy(e, CGF.getOpaqueLValueMapping(e)); 253e996ffd240f20a1048179d7727a6ee3227261921John McCall} 254e996ffd240f20a1048179d7727a6ee3227261921John McCall 255751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregorvoid 256751ec9be961888f14342fb63b39bf8727f0dee49Douglas GregorAggExprEmitter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 257673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor if (E->getType().isPODType(CGF.getContext())) { 258673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // For a POD type, just emit a load of the lvalue + a copy, because our 259673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // compound literal might alias the destination. 260673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // FIXME: This is a band-aid; the real problem appears to be in our handling 261673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // of assignments, where we store directly into the LHS without checking 262673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor // whether anything in the RHS aliases. 263673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor EmitAggLoadOfLValue(E); 264673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor return; 265673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor } 266673e98b4814642eb040a661fcc0f7953edd4c150Douglas Gregor 267751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor AggValueSlot Slot = EnsureSlot(E->getType()); 268751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor CGF.EmitAggExpr(E->getInitializer(), Slot); 269751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor} 270751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 271751ec9be961888f14342fb63b39bf8727f0dee49Douglas Gregor 2724d8673b645ad86e496b886a0f80b60763f67071dAnders Carlssonvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 2733016842613674ab80796567239c15d529aff1458Anders Carlsson switch (E->getCastKind()) { 274575b374fdbfc2c2224fd3047ac11ffc4b8db9ae5Anders Carlsson case CK_Dynamic: { 27569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 27669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 27769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor // FIXME: Do we also need to handle property references here? 27869cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor if (LV.isSimple()) 27969cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 28069cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor else 28169cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 28269cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 283558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) 284558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 28569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor break; 28669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor } 28769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 2882de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ToUnion: { 2896591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall if (Dest.isIgnored()) break; 2906591271275f7a3db357f3cb7af37ef86e800e4baJohn McCall 2914d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson // GCC union extension 29279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType Ty = E->getSubExpr()->getType(); 29379c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType PtrTy = CGF.getContext().getPointerType(Ty); 294558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), 29534ebf4d1767e6748a1a59a5d1935c495cd8877e8Eli Friedman CGF.ConvertType(PtrTy)); 296a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getSubExpr(), 297a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.MakeAddrLValue(CastPtr, Ty)); 2983016842613674ab80796567239c15d529aff1458Anders Carlsson break; 2997e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 3001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3012de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_DerivedToBase: 3022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BaseToDerived: 3032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UncheckedDerivedToBase: { 3042d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " 3052d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor "should have been unpacked before we got here"); 3062d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor break; 3072d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor } 3082d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor 309f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_GetObjCProperty: { 310f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall LValue LV = CGF.EmitLValue(E->getSubExpr()); 311f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall assert(LV.isPropertyRef()); 312f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall RValue RV = CGF.EmitLoadOfPropertyRefLValue(LV, getReturnValueSlot()); 313f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall EmitGCMove(E, RV); 314f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall break; 315f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall } 316f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 317f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_LValueToRValue: // hope for downstream optimization 3182de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_NoOp: 3192de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UserDefinedConversion: 3202de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ConstructorConversion: 3213016842613674ab80796567239c15d529aff1458Anders Carlsson assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 3223016842613674ab80796567239c15d529aff1458Anders Carlsson E->getType()) && 3233016842613674ab80796567239c15d529aff1458Anders Carlsson "Implicit cast types must be compatible"); 3243016842613674ab80796567239c15d529aff1458Anders Carlsson Visit(E->getSubExpr()); 3253016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3260ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall 3272de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_LValueBitCast: 3280ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); 329e39a3894513349908cdb3beba2614e53cb288e6cDouglas Gregor break; 3301de4d4e8cb2e9c88809fea8092bc6e835a5473d2John McCall 3310ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_Dependent: 3320ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BitCast: 3330ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ArrayToPointerDecay: 3340ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FunctionToPointerDecay: 3350ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToPointer: 3360ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToMemberPointer: 3370ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BaseToDerivedMemberPointer: 3380ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_DerivedToBaseMemberPointer: 3390ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_MemberPointerToBoolean: 3400ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToPointer: 3410ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToIntegral: 3420ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToBoolean: 3430ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ToVoid: 3440ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_VectorSplat: 3450ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralCast: 3460ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToBoolean: 3470ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToFloating: 3480ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToIntegral: 3490ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToBoolean: 3500ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingCast: 3510ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToObjCPointerCast: 3520ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToBlockPointerCast: 3530ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ObjCObjectLValueCast: 3540ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingRealToComplex: 3550ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToReal: 3560ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToBoolean: 3570ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexCast: 3580ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToIntegralComplex: 3590ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralRealToComplex: 3600ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToReal: 3610ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToBoolean: 3620ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexCast: 3630ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToFloatingComplex: 364f85e193739c953358c865005855253af4f68a497John McCall case CK_ObjCProduceObject: 365f85e193739c953358c865005855253af4f68a497John McCall case CK_ObjCConsumeObject: 3667e5e5f4cc36fe50f46ad76dca7a266434c94f475John McCall case CK_ObjCReclaimReturnedObject: 3670ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("cast kind invalid for aggregate types"); 3683016842613674ab80796567239c15d529aff1458Anders Carlsson } 369e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 370e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 3719619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 372e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson if (E->getCallReturnType()->isReferenceType()) { 373e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson EmitAggLoadOfLValue(E); 374e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson return; 375e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson } 3761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 377fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); 378fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall EmitGCMove(E, RV); 379796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 3809619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 3819619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 382fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 383fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall EmitGCMove(E, RV); 3848fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 385796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 3869c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 387f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall llvm_unreachable("direct property access not surrounded by " 388f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall "lvalue-to-rvalue cast"); 3895daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 3905daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 3919619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 3922a41637a995affa1563f4d82a8b026e326a2faa0John McCall CGF.EmitIgnoredExpr(E->getLHS()); 393558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getRHS()); 39407fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 39507fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 396b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 397150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::StmtExprEvaluation eval(CGF); 398558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); 399b2d963f527674275c9109252474948368b6e6161Chris Lattner} 400b2d963f527674275c9109252474948368b6e6161Chris Lattner 4019c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 4022de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) 4038bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian VisitPointerToDataMemberBinaryOperator(E); 4048bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian else 4058bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian CGF.ErrorUnsupported(E, "aggregate binary expression"); 4068bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian} 4078bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian 4088bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanianvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 4098bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian const BinaryOperator *E) { 4108bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 4118bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian EmitFinalDestCopy(E, LV); 412ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 413ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 41403d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 415ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 416ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 4172dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 4182dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman E->getRHS()->getType()) 419ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 420cd940a1e13e588a43973cd7ae33b5c33a3062739John McCall 4212c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getLHS())) 42273a6f8e8ad2174fb70cfb4c7d7afe424cfe8a147Fariborz Jahanian if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) 4232c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (VD->hasAttr<BlocksAttr>() && 4242c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian E->getRHS()->HasSideEffects(CGF.getContext())) { 4252c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // When __block variable on LHS, the RHS must be evaluated first 4262c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian // as it may change the 'forwarding' field via call to Block_copy. 4272c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue RHS = CGF.EmitLValue(E->getRHS()); 4282c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian LValue LHS = CGF.EmitLValue(E->getLHS()); 4292c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian bool GCollection = false; 4302c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian if (CGF.getContext().getLangOptions().getGCMode()) 4312c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian GCollection = TypeRequiresGCollection(E->getLHS()->getType()); 4322c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian Dest = AggValueSlot::forLValue(LHS, true, GCollection); 4332c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian EmitFinalDestCopy(E, RHS, true); 4342c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian return; 4352c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian } 4362c7168c660ab2b961ad48087e02cca96f7bb94d2Fariborz Jahanian 4379c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 438883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 4397f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 4407f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 4417f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 44268af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian const ObjCPropertyRefExpr *RE = LHS.getPropertyRefExpr(); 44368af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian QualType ArgType = RE->getSetterArgType(); 44468af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian RValue Src; 44568af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian if (ArgType->isReferenceType()) 44668af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian Src = CGF.EmitReferenceBindingToExpr(E->getRHS(), 0); 44768af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian else { 44868af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian AggValueSlot Slot = EnsureSlot(E->getRHS()->getType()); 44968af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian CGF.EmitAggExpr(E->getRHS(), Slot); 45068af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian Src = Slot.asRValue(); 45168af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian } 45268af13f3ca39947e3f285f864fe3b76640fddf69Fariborz Jahanian CGF.EmitStoreThroughPropertyRefLValue(Src, LHS); 4537f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 454474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool GCollection = false; 455fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (CGF.getContext().getLangOptions().getGCMode()) 456474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian GCollection = TypeRequiresGCollection(E->getLHS()->getType()); 457fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 4587f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 459474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian AggValueSlot LHSSlot = AggValueSlot::forLValue(LHS, true, 460474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian GCollection); 461474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); 46249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump EmitFinalDestCopy(E, LHS, true); 4637f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 464883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 465883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 46656ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallvoid AggExprEmitter:: 46756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCallVisitAbstractConditionalOperator(const AbstractConditionalOperator *E) { 4689615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 4699615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 4709615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 4711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47256ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall // Bind the common expression if necessary. 47356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall CodeGenFunction::OpaqueValueMapping binding(CGF, E); 47456ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall 475150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CodeGenFunction::ConditionalEvaluation eval(CGF); 4768e274bd14bcca8466542477844b88e90e90cde1aEli Friedman CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 4771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 47874fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // Save whether the destination's lifetime is externally managed. 47974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall bool DestLifetimeManaged = Dest.isLifetimeExternallyManaged(); 480883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 481150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 482150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(LHSBlock); 48356ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getTrueExpr()); 484150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 4851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 486150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall assert(CGF.HaveInsertPoint() && "expression evaluation ended with no IP!"); 487150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.Builder.CreateBr(ContBlock); 4881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // If the result of an agg expression is unused, then the emission 49074fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // of the LHS might need to create a destination slot. That's fine 49174fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // with us, and we can safely emit the RHS into the same slot, but 49274fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // we shouldn't claim that its lifetime is externally managed. 49374fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall Dest.setLifetimeExternallyManaged(DestLifetimeManaged); 49474fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall 495150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.begin(CGF); 496150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall CGF.EmitBlock(RHSBlock); 49756ca35d396d8692c384c785f9aeebcf22563fe1eJohn McCall Visit(E->getFalseExpr()); 498150b462afc7a713edd19bcbbbb22381fe060d4f5John McCall eval.end(CGF); 4991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5009c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 501883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 502ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 503a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlssonvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 504a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson Visit(CE->getChosenSubExpr(CGF.getContext())); 505a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson} 506a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson 507b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 5080785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 509ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 510ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 5110262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 512ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 5130262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 5140262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 5150262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 51679c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); 517b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 518b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 519b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlssonvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 520558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Ensure that we have a slot, but if we already do, remember 521558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // whether its lifetime was externally managed. 522558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall bool WasManaged = Dest.isLifetimeExternallyManaged(); 523558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = EnsureSlot(E->getType()); 524558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.setLifetimeExternallyManaged(); 525558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 526558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getSubExpr()); 527558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 528558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Set up the temporary's destructor if its lifetime wasn't already 529558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // being managed. 530558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!WasManaged) 531558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXTemporary(E->getTemporary(), 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) { 5414765fa05b5652fcc4356371c2f481d0ea9a1b007John McCall CGF.EmitExprWithCleanups(E, Dest); 542b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 543b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 544ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregorvoid AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { 545558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 546558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 547a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 54830311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson} 54930311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson 55030311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlssonvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 551558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 552558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 553a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T)); 554329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes} 555329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes 5561b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// isSimpleZero - If emitting this value will obviously just cause a store of 5571b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zero to memory, return true. This can return false if uncertain, so it just 5581b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// handles simple cases. 5591b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { 560f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 561f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne 5621b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 5631b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) 5641b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return IL->getValue() == 0; 5651b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // +0.0 5661b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) 5671b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return FL->getValue().isPosZero(); 5681b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // int() 5691b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && 5701b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 5711b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return true; 5721b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // (int*)0 - Null pointer expressions. 5731b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) 5741b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return ICE->getCastKind() == CK_NullToPointer; 5751b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // '\0' 5761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) 5771b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return CL->getValue() == 0; 5781b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5791b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Otherwise, hard case: conservatively return false. 5801b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return false; 5811b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 5821b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5831b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 58478e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlssonvoid 585a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 586a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = LV.getType(); 5877f79f9be5916c51c35da4f126b7c12596a101607Mike Stump // FIXME: Ignore result? 588f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 5891b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Dest.isZeroed() && isSimpleZero(E, CGF)) { 5901b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Storing "i32 0" to a zero'd memory location is a noop. 5911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner } else if (isa<ImplicitValueInitExpr>(E)) { 592a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(LV); 593a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isReferenceType()) { 59432f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); 595545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RV, LV); 596a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (type->isAnyComplexType()) { 5973498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 598a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall } else if (CGF.hasAggregateLLVMType(type)) { 599a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitAggExpr(E, AggValueSlot::forLValue(LV, true, false, 600a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall Dest.isZeroed())); 601f85e193739c953358c865005855253af4f68a497John McCall } else if (LV.isSimple()) { 602a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitScalarInit(E, /*D=*/0, LV, /*Captured=*/false); 603c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 604545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV); 605f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 606f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 607305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 608a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCallvoid AggExprEmitter::EmitNullInitializationToLValue(LValue lv) { 609a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall QualType type = lv.getType(); 610a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall 6111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the destination slot is already zeroed out before the aggregate is 6121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // copied into it, we don't have to emit any zeros here. 613a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(type)) 6141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 6151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 616a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall if (!CGF.hasAggregateLLVMType(type)) { 617f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 618a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall llvm::Value *null = llvm::Constant::getNullValue(CGF.ConvertType(type)); 619545d996ec5a3113f046944f11b27cc2d6cb055b4John McCall CGF.EmitStoreThroughLValue(RValue::get(null), lv); 620f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 621f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 622f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 623f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 624a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall CGF.EmitNullInitialization(lv.getAddress(), lv.getType()); 625f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 626f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 627305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 628f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 629a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 63013a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // FIXME: Assess perf here? Figure out what cases are worth optimizing here 63113a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // (Length of globals? Chunks of zeroed-out space?). 632a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 633f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 634f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 63513a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 636994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 63713a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 63813a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman llvm::GlobalValue::InternalLinkage, C, ""); 63979c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); 640994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 641994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 642a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 643d0db03a561671b8b466b07026cc8fbbb037bb639Chris Lattner if (E->hadArrayRangeDesignator()) 644a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 645a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 646558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *DestPtr = Dest.getAddr(); 647558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 648f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 649f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 6502acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *APType = 651f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 6522acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::ArrayType *AType = 653f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 6541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 655f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 656922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 6579619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 6589619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 6599619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 6602dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 6619619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 6629619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 6639619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 664922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 665922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 666f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 667bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(NumInitElements <= NumArrayElements); 668bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 669bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType elementType = E->getType().getCanonicalType(); 670bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType = CGF.getContext().getQualifiedType( 671bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cast<ArrayType>(elementType)->getElementType(), 672bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall elementType.getQualifiers() + Dest.getQualifiers()); 673bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 674bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // DestPtr is an array*. Construct an elementType* by drilling 675bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // down a level. 676bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); 677bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *indices[] = { zero, zero }; 678bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *begin = 679bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateInBoundsGEP(DestPtr, indices, indices+2, "arrayinit.begin"); 680bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 681bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Exception safety requires us to destroy all the 682bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // already-constructed members if an initializer throws. 683bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // For that, we'll need an EH cleanup. 684bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall QualType::DestructionKind dtorKind = elementType.isDestructedType(); 685bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::AllocaInst *endOfInit = 0; 686bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EHScopeStack::stable_iterator cleanup; 687bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CGF.needsEHCleanup(dtorKind)) { 688bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // In principle we could tell the cleanup where we are more 689bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // directly, but the control flow can get so varied here that it 690bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // would actually be quite complex. Therefore we go through an 691bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // alloca. 692bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall endOfInit = CGF.CreateTempAlloca(begin->getType(), 693bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.endOfInit"); 694bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateStore(begin, endOfInit); 6952673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.pushIrregularPartialArrayCleanup(begin, endOfInit, elementType, 6962673c68aa58e277ebc755b71d81aca618cdedbf9John McCall CGF.getDestroyer(dtorKind)); 697bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall cleanup = CGF.EHStack.stable_begin(); 698bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 699bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Otherwise, remember that we didn't need a cleanup. 700bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } else { 701bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall dtorKind = QualType::DK_none; 702bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 7033b4d490b09347e0b68ec0511ddfae79dfaba77a6Argyrios Kyrtzidis 704bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *one = llvm::ConstantInt::get(CGF.SizeTy, 1); 705bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 706bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // The 'current element to initialize'. The invariants on this 707bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // variable are complicated. Essentially, after each iteration of 708bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // the loop, it points to the last initialized element, except 709bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // that it points to the beginning of the array before any 710bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // elements have been initialized. 711bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *element = begin; 712bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 713bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the explicit initializers. 714bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall for (uint64_t i = 0; i != NumInitElements; ++i) { 715bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the next element. 7162673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (i > 0) { 717bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.element"); 718bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 7192673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the cleanup that it needs to destroy up to this 7202673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // element. TODO: some of these stores can be trivially 7212673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // observed to be unnecessary. 7222673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7232673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 7242673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 725bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(element, elementType); 726bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(E->getInit(i), elementLV); 727bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 728bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 729bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Check whether there's a non-trivial array-fill expression. 730bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Note that this will be a CXXConstructExpr even if the element 731bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // type is an array (or array of array, etc.) of class type. 732bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Expr *filler = E->getArrayFiller(); 733bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall bool hasTrivialFiller = true; 734bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (CXXConstructExpr *cons = dyn_cast_or_null<CXXConstructExpr>(filler)) { 735bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall assert(cons->getConstructor()->isDefaultConstructor()); 736bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall hasTrivialFiller = cons->getConstructor()->isTrivial(); 737bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall } 738bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 739bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Any remaining elements need to be zero-initialized, possibly 740bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // using the filler expression. We can skip this if the we're 741bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // emitting to zeroed memory. 742bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (NumInitElements != NumArrayElements && 743bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall !(Dest.isZeroed() && hasTrivialFiller && 744bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.getTypes().isZeroInitializable(elementType))) { 745bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 746bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Use an actual loop. This is basically 747bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // do { *array++ = filler; } while (array != end); 748bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 749bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Advance to the start of the rest of the array. 7502673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (NumInitElements) { 751bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall element = Builder.CreateInBoundsGEP(element, one, "arrayinit.start"); 7522673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(element, endOfInit); 7532673c68aa58e277ebc755b71d81aca618cdedbf9John McCall } 754bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 755bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Compute the end of the array. 756bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *end = Builder.CreateInBoundsGEP(begin, 757bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::ConstantInt::get(CGF.SizeTy, NumArrayElements), 758bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.end"); 759bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 760bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *entryBB = Builder.GetInsertBlock(); 761bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *bodyBB = CGF.createBasicBlock("arrayinit.body"); 762bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 763bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Jump into the body. 764bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(bodyBB); 765bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::PHINode *currentElement = 766bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreatePHI(element->getType(), 2, "arrayinit.cur"); 767bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(element, entryBB); 768bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 769bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Emit the actual filler expression. 770bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall LValue elementLV = CGF.MakeAddrLValue(currentElement, elementType); 771bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (filler) 772bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitInitializationToLValue(filler, elementLV); 773f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 774bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall EmitNullInitializationToLValue(elementLV); 775bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 776bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Move on to the next element. 777bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *nextElement = 778bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateInBoundsGEP(currentElement, one, "arrayinit.next"); 779bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 7802673c68aa58e277ebc755b71d81aca618cdedbf9John McCall // Tell the EH cleanup that we finished with the last element. 7812673c68aa58e277ebc755b71d81aca618cdedbf9John McCall if (endOfInit) Builder.CreateStore(nextElement, endOfInit); 7822673c68aa58e277ebc755b71d81aca618cdedbf9John McCall 783bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the loop if we're done. 784bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::Value *done = Builder.CreateICmpEQ(nextElement, end, 785bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall "arrayinit.done"); 786bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall llvm::BasicBlock *endBB = CGF.createBasicBlock("arrayinit.end"); 787bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall Builder.CreateCondBr(done, endBB, bodyBB); 788bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall currentElement->addIncoming(nextElement, Builder.GetInsertBlock()); 789bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 790bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall CGF.EmitBlock(endBB); 791f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 792bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 793bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall // Leave the partial-array cleanup if we entered one. 794bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall if (dtorKind) CGF.DeactivateCleanupBlock(cleanup); 795bdc4d80956c83a486e58d3df6bb524a1f66ff574John McCall 796305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 797f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 7981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 799f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 8001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 801f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 802f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 803f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 804f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 805f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 8062b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall RecordDecl *record = E->getType()->castAs<RecordType>()->getDecl(); 807bd7de38eae1fc20ee88db63f469c54241bc240f8Chris Lattner 8082b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (record->isUnion()) { 8090bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 8100bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 8110bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 8120bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 8131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8140bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 8150bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 8160bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 8172b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator Field = record->field_begin(), 8182b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall FieldEnd = record->field_end(); 8190bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 8200bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 8210bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 8220bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8230bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8240bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8250bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 8260bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 8270bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8281b726771d00762fb5c4c2638e60d134c385493aeChris Lattner LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 8290bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 8300bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 831a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitInitializationToLValue(E->getInit(0), FieldLoc); 8320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 8331b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Default-initialize to null. 834a07398ed98ea2b55ad7a505a3aab18aed93b149fJohn McCall EmitNullInitializationToLValue(FieldLoc); 8350bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8360bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 8370bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 8380bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 8391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8402b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We'll need to enter cleanup scopes in case any of the member 8412b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initializers throw an exception. 8422b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall llvm::SmallVector<EHScopeStack::stable_iterator, 16> cleanups; 8432b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 844f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 845f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 8462b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall unsigned curInitIndex = 0; 8472b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (RecordDecl::field_iterator field = record->field_begin(), 8482b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall fieldEnd = record->field_end(); 8492b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall field != fieldEnd; ++field) { 8502b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done once we hit the flexible array member. 8512b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->getType()->isIncompleteArrayType()) 85244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 85344b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 8542b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Always skip anonymous bitfields. 8552b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (field->isUnnamedBitfield()) 856f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 85734e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 8582b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // We're done if we reach the end of the explicit initializers, we 8592b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // have a zeroed object, and the rest of the fields are 8602b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // zero-initializable. 8612b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex == NumInitElements && Dest.isZeroed() && 8621b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 8631b726771d00762fb5c4c2638e60d134c385493aeChris Lattner break; 8641b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8651e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 8662b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LValue LV = CGF.EmitLValueForFieldInitialization(DestPtr, *field, 0); 86714674ffb81dccbc4e1bf78ab5b7987685819b445Fariborz Jahanian // We never generate write-barries for initialized fields. 8682b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall LV.setNonGC(true); 8691b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8702b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (curInitIndex < NumInitElements) { 871b35baae19b906245b5c2266b47ef411abcc6b25aChris Lattner // Store the initializer into the field. 8722b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitInitializationToLValue(E->getInit(curInitIndex++), LV); 873f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 874f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 8752b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall EmitNullInitializationToLValue(LV); 8762b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 8772b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 8782b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Push a destructor if necessary. 8792b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // FIXME: if we have an array of structures, all explicitly 8802b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // initialized, we can end up pushing a linear number of cleanups. 8812b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall bool pushedCleanup = false; 8822b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (QualType::DestructionKind dtorKind 8832b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall = field->getType().isDestructedType()) { 8842b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall assert(LV.isSimple()); 8852b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (CGF.needsEHCleanup(dtorKind)) { 8862b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.pushDestroy(EHCleanup, LV.getAddress(), field->getType(), 8872b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.getDestroyer(dtorKind), false); 8882b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall cleanups.push_back(CGF.EHStack.stable_begin()); 8892b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall pushedCleanup = true; 8902b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall } 891f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 8921b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8931b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the GEP didn't get used because of a dead zero init or something 8941b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // else, clean it up for -O0 builds and general tidiness. 8952b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall if (!pushedCleanup && LV.isSimple()) 8961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (llvm::GetElementPtrInst *GEP = 8972b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall dyn_cast<llvm::GetElementPtrInst>(LV.getAddress())) 8981b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (GEP->use_empty()) 8991b726771d00762fb5c4c2638e60d134c385493aeChris Lattner GEP->eraseFromParent(); 900145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 9012b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall 9022b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // Deactivate all the partial cleanups in reverse order, which 9032b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall // generally means popping them. 9042b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall for (unsigned i = cleanups.size(); i != 0; --i) 9052b30dcfb769e4015f8d41c5c9a4e723ff3d522a0John McCall CGF.DeactivateCleanupBlock(cleanups[i-1]); 906636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 907636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 908ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 909ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 910ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 911ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 9121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// GetNumNonZeroBytesInInit - Get an approximate count of the number of 9131b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// non-zero bytes that will be stored when outputting the initializer for the 9141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// specified initializer expression. 91502c45333b8310bb792a15f85f219706025f9752cKen Dyckstatic CharUnits GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { 916f111d935722ed488144600cea5ed03a6b5069e8fPeter Collingbourne E = E->IgnoreParens(); 9171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 and 0.0 won't require any non-zero stores! 91902c45333b8310bb792a15f85f219706025f9752cKen Dyck if (isSimpleZero(E, CGF)) return CharUnits::Zero(); 9201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If this is an initlist expr, sum up the size of sizes of the (present) 9221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // elements. If this is something weird, assume the whole thing is non-zero. 9231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner const InitListExpr *ILE = dyn_cast<InitListExpr>(E); 9241b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) 92502c45333b8310bb792a15f85f219706025f9752cKen Dyck return CGF.getContext().getTypeSizeInChars(E->getType()); 9261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 927d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // InitListExprs for structs have to be handled carefully. If there are 928d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // reference members, we need to consider the size of the reference, not the 929d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // referencee. InitListExprs for unions and arrays can't have references. 9308c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (const RecordType *RT = E->getType()->getAs<RecordType>()) { 9318c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (!RT->isUnionType()) { 9328c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 93302c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 934d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9358c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner unsigned ILEElement = 0; 9368c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner for (RecordDecl::field_iterator Field = SD->field_begin(), 9378c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { 9388c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // We're done once we hit the flexible array member or run out of 9398c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // InitListExpr elements. 9408c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isIncompleteArrayType() || 9418c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner ILEElement == ILE->getNumInits()) 9428c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner break; 9438c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->isUnnamedBitfield()) 9448c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner continue; 9458c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9468c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner const Expr *E = ILE->getInit(ILEElement++); 9478c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 9488c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // Reference values are always non-null and have the width of a pointer. 9498c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isReferenceType()) 95002c45333b8310bb792a15f85f219706025f9752cKen Dyck NumNonZeroBytes += CGF.getContext().toCharUnitsFromBits( 95102c45333b8310bb792a15f85f219706025f9752cKen Dyck CGF.getContext().Target.getPointerWidth(0)); 9528c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner else 9538c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); 9548c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner } 955d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 9568c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner return NumNonZeroBytes; 957d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 958d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 959d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 960d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 96102c45333b8310bb792a15f85f219706025f9752cKen Dyck CharUnits NumNonZeroBytes = CharUnits::Zero(); 9621b726771d00762fb5c4c2638e60d134c385493aeChris Lattner for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) 9631b726771d00762fb5c4c2638e60d134c385493aeChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); 9641b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return NumNonZeroBytes; 9651b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 9661b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9671b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// CheckAggExprForMemSetUse - If the initializer is large and has a lot of 9681b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zeros in it, emit a memset and avoid storing the individual zeros. 9691b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// 9701b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, 9711b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CodeGenFunction &CGF) { 9721b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the slot is already known to be zeroed, nothing to do. Don't mess with 9731b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // volatile stores. 9741b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; 975657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 976657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis // C++ objects with a user-declared constructor don't need zero'ing. 977657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (CGF.getContext().getLangOptions().CPlusPlus) 978657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (const RecordType *RT = CGF.getContext() 979657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis .getBaseElementType(E->getType())->getAs<RecordType>()) { 980657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 981657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis if (RD->hasUserDeclaredConstructor()) 982657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis return; 983657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis } 984657baf19ca8a48a926bd3bc148b6ad1b17e53199Argyrios Kyrtzidis 9851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the type is 16-bytes or smaller, prefer individual stores over memset. 9865ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck std::pair<CharUnits, CharUnits> TypeInfo = 9875ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.getContext().getTypeInfoInChars(E->getType()); 9885ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (TypeInfo.first <= CharUnits::fromQuantity(16)) 9891b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 9901b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Check to see if over 3/4 of the initializer are known to be zero. If so, 9921b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // we prefer to emit memset + individual stores for the rest. 9935ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); 9945ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck if (NumNonZeroBytes*4 > TypeInfo.first) 9951b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 9961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 9971b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Okay, it seems like a good idea to use an initial memset, emit the call. 9985ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first.getQuantity()); 9995ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CharUnits Align = TypeInfo.second; 10001b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10011b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::Value *Loc = Slot.getAddr(); 10022acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); 10031b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10041b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Loc = CGF.Builder.CreateBitCast(Loc, BP); 10055ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck CGF.Builder.CreateMemSet(Loc, CGF.Builder.getInt8(0), SizeVal, 10065ff1a3508b39cfe3c9d108679a6532d85586b5ceKen Dyck Align.getQuantity(), false); 10071b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10081b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Tell the AggExprEmitter that the slot is known zero. 10091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Slot.setZeroed(); 10101b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 10111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10131b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 1015e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// EmitAggExpr - Emit the computation of the specified expression of aggregate 1016e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// type. The result is computed into DestPtr. Note that if DestPtr is null, 1017e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// the value of the aggregate expression is not needed. If VolatileDest is 1018e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// true, DestPtr cannot be 0. 1019558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// 1020558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// \param IsInitializer - true if this evaluation is initializing an 1021558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// object whose lifetime is already being managed. 1022558d2abc7f9fd6801cc7677200992313ae90b5d8John McCallvoid CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, 1023474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool IgnoreResult) { 1024ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 1025ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 10261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner assert((Slot.getAddr() != 0 || Slot.isIgnored()) && 10271b726771d00762fb5c4c2638e60d134c385493aeChris Lattner "slot has bits but no address"); 10281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10291b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Optimize the slot if possible. 10301b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CheckAggExprForMemSetUse(Slot, E, *this); 10311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 10321b726771d00762fb5c4c2638e60d134c385493aeChris Lattner AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); 1033ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 10347482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 103518aba0dd518e486d8b50523e7dafb4b5657135d2Daniel DunbarLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 103618aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 1037195337d2e5d4625ae9dc1328c7cdbc7115b0261bDaniel Dunbar llvm::Value *Temp = CreateMemTemp(E->getType()); 103879c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar LValue LV = MakeAddrLValue(Temp, E->getType()); 1039f85e193739c953358c865005855253af4f68a497John McCall EmitAggExpr(E, AggValueSlot::forLValue(LV, false)); 104079c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar return LV; 104118aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar} 104218aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar 10437482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 104427fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump llvm::Value *SrcPtr, QualType Ty, 104527fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump bool isVolatile) { 10467482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 10471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10480d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (getContext().getLangOptions().CPlusPlus) { 10490d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (const RecordType *RT = Ty->getAs<RecordType>()) { 1050e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 1051e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor assert((Record->hasTrivialCopyConstructor() || 10521d49f2112572c247ff9c209de112fbf5d9ecf765Fariborz Jahanian Record->hasTrivialCopyAssignment()) && 1053e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "Trying to aggregate-copy a type without a trivial copy " 1054e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "constructor or assignment operator"); 1055419aa964ae845aa5b1183fabb2f1cff78faaedddDouglas Gregor // Ignore empty classes in C++. 1056e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor if (Record->isEmpty()) 10570d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson return; 10580d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10590d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 10600d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson 106183c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 1062ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 1063ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 1064ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 1065ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 1066ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 106783c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 1068ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 1069ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 1070ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 10711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10727482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 10731a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck std::pair<CharUnits, CharUnits> TypeInfo = 10741a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck getContext().getTypeInfoInChars(Ty); 10751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10767482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 10771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1078fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 1079fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 1080fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1081fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 1082fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 1083fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 1084fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1085fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 1086fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 1087fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 10883ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang // we need to use a different call here. We use isVolatile to indicate when 108949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // either the source or the destination is volatile. 10903ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 10912acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 10922acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *DBP = 1093d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), DPT->getAddressSpace()); 1094098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); 10953ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 10962acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 10972acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SBP = 1098d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall llvm::Type::getInt8PtrTy(getLLVMContext(), SPT->getAddressSpace()); 1099098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); 11003ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 1101f85e193739c953358c865005855253af4f68a497John McCall // Don't do any of the memmove_collectable tests if GC isn't set. 1102f85e193739c953358c865005855253af4f68a497John McCall if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) { 1103f85e193739c953358c865005855253af4f68a497John McCall // fall through 1104f85e193739c953358c865005855253af4f68a497John McCall } else if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { 110555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian RecordDecl *Record = RecordTy->getDecl(); 110655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (Record->hasObjectMember()) { 11071a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11082acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11091a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size.getQuantity()); 111055bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 111155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 111255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 111355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 1114f85e193739c953358c865005855253af4f68a497John McCall } else if (Ty->isArrayType()) { 111555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian QualType BaseType = getContext().getBaseElementType(Ty); 111655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { 111755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (RecordTy->getDecl()->hasObjectMember()) { 11181a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck CharUnits size = TypeInfo.first; 11192acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 11201a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::Value *SizeVal = 11211a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(SizeTy, size.getQuantity()); 112255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 112355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 112455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 112555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 112655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 112755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 112855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian 11299f0c7cc36d29cf591c33962931f5862847145f3eBenjamin Kramer Builder.CreateMemCpy(DestPtr, SrcPtr, 11301a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck llvm::ConstantInt::get(IntPtrTy, 11311a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck TypeInfo.first.getQuantity()), 11321a8c15a8b7f7c6d851e0d3dd1b86d5f78515ffa4Ken Dyck TypeInfo.second.getQuantity(), isVolatile); 11337482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 1134