CGExprAgg.cpp revision 2a41637a995affa1563f4d82a8b026e326a2faa0
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()); } 8412444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 859c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 869c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 879b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 889b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 899b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 905be028f84243e0f6906c259e67cbdaf9bee431b2Daniel Dunbar void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 91f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 93f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 949b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 959b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 969b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 97f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 99f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 100f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 1011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump EmitAggLoadOfLValue(E); 102f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 1031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1049c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 1054d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson void VisitCastExpr(CastExpr *E); 106148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 107b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 1089c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 1098bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 11003d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 11107fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 1129c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1138fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 1140a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 1150a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 1160a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 1179c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 1181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1199c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitConditionalOperator(const ConditionalOperator *CO); 120a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson void VisitChooseExpr(const ChooseExpr *CE); 121636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 12230311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 12304421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 12404421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 12504421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 126b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 12731ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 1287f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 129ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregor void VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E); 1302710c4159ff4761ba9867aca18f60a178b297686Mike Stump void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 1317f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 132b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 133f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 13478e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson void EmitInitializationToLValue(Expr *E, LValue Address, QualType T); 135f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitNullInitializationToLValue(LValue Address, QualType T); 1369c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 13739406b1395f69341c045e863a6620310abdc55b6Mike Stump void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 1389c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1399c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1409c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 141ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 142ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 143ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1449c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 145883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 146883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 147883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1489c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1499c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1504ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1514ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1524ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 153fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief True if the given aggregate type requires special GC API calls. 154fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallbool AggExprEmitter::TypeRequiresGCollection(QualType T) { 155fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Only record types have members that might require garbage collection. 156fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall const RecordType *RecordTy = T->getAs<RecordType>(); 157fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (!RecordTy) return false; 158fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 159fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Don't mess with non-trivial C++ types. 160fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RecordDecl *Record = RecordTy->getDecl(); 161fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (isa<CXXRecordDecl>(Record) && 162fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || 163fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 164fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return false; 165fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 166fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall // Check whether the type has an object member. 167fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall return Record->hasObjectMember(); 168fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 169fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 170fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// \brief Perform the final move to DestPtr if RequiresGCollection is set. 171fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// 172fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// The idea is that you do something like this: 173fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// RValue Result = EmitSomething(..., getReturnValueSlot()); 174fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// EmitGCMove(E, Result); 175fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// If GC doesn't interfere, this will cause the result to be emitted 176fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// directly into the return value slot. If GC does interfere, a final 177fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall/// move will be performed. 178fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCallvoid AggExprEmitter::EmitGCMove(const Expr *E, RValue Src) { 179d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 18055bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian std::pair<uint64_t, unsigned> TypeInfo = 18155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGF.getContext().getTypeInfo(E->getType()); 18255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian unsigned long size = TypeInfo.first/8; 18355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 18455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); 185558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, Dest.getAddr(), 186fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall Src.getAggregateAddr(), 18755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 18855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 189fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall} 190fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 1914ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 19249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 1934ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 1944ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 195558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // If Dest is ignored, then we're evaluating an aggregate expression 196a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // in a context (like an expression statement) that doesn't care 197a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // about the result. C says that an lvalue-to-rvalue conversion is 198a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // performed in these cases; C++ says that it is not. In either 199a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // case, we don't actually need to do anything unless the value is 200a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall // volatile. 201558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (Dest.isIgnored()) { 202a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall if (!Src.isVolatileQualified() || 203a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall CGF.CGM.getLangOptions().CPlusPlus || 204a8f28da6265950eea768f7e4ade15e4ebaddd56fJohn McCall (IgnoreResult && Ignore)) 2059ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 2068a97005f97a2a93fc2cd942c040668c5d4df7537Fariborz Jahanian 20749d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // If the source is volatile, we must read from it; to do that, we need 20849d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // some place to put it. 209558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = CGF.CreateAggTemp(E->getType(), "agg.tmp"); 2109ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 211883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 212d1a5f13140a5bfcf9107b28de906518d2313fdf0John McCall if (Dest.requiresGCollection()) { 21355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian std::pair<uint64_t, unsigned> TypeInfo = 21455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGF.getContext().getTypeInfo(E->getType()); 21555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian unsigned long size = TypeInfo.first/8; 21655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian const llvm::Type *SizeTy = CGF.ConvertType(CGF.getContext().getSizeType()); 21755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); 21808c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 219558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.getAddr(), 220558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Src.getAggregateAddr(), 221558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall SizeVal); 22208c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian return; 22308c321380fff07d476a19daab6d29522c046cd49Fariborz Jahanian } 2244ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 2254ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 2264ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 2274ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 228558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitAggregateCopy(Dest.getAddr(), Src.getAggregateAddr(), E->getType(), 229558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.isVolatile()|Src.isVolatileQualified()); 2304ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 2314ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2324ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 23349d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 2344ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 2354ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 2364ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 23749d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Src.isVolatileQualified()), 23849d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Ignore); 239883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 240883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 241ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 242ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 243ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 244ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 2454d8673b645ad86e496b886a0f80b60763f67071dAnders Carlssonvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 246558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (Dest.isIgnored() && E->getCastKind() != CK_Dynamic) { 2474ce46c2db2b17ef52b34dbeeec01e448025c8edcDouglas Gregor Visit(E->getSubExpr()); 2484ce46c2db2b17ef52b34dbeeec01e448025c8edcDouglas Gregor return; 2494ce46c2db2b17ef52b34dbeeec01e448025c8edcDouglas Gregor } 2504ce46c2db2b17ef52b34dbeeec01e448025c8edcDouglas Gregor 2513016842613674ab80796567239c15d529aff1458Anders Carlsson switch (E->getCastKind()) { 2522de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_Dynamic: { 25369cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 25469cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 25569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor // FIXME: Do we also need to handle property references here? 25669cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor if (LV.isSimple()) 25769cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 25869cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor else 25969cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 26069cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 261558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!Dest.isIgnored()) 262558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 26369cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor break; 26469cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor } 26569cfeb1036ad22c911b7243dca0eecee72e452d3Douglas Gregor 2662de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ToUnion: { 2674d8673b645ad86e496b886a0f80b60763f67071dAnders Carlsson // GCC union extension 26879c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType Ty = E->getSubExpr()->getType(); 26979c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar QualType PtrTy = CGF.getContext().getPointerType(Ty); 270558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *CastPtr = Builder.CreateBitCast(Dest.getAddr(), 27134ebf4d1767e6748a1a59a5d1935c495cd8877e8Eli Friedman CGF.ConvertType(PtrTy)); 27279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitInitializationToLValue(E->getSubExpr(), CGF.MakeAddrLValue(CastPtr, Ty), 27379c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar Ty); 2743016842613674ab80796567239c15d529aff1458Anders Carlsson break; 2757e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 2761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2772de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_DerivedToBase: 2782de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_BaseToDerived: 2792de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UncheckedDerivedToBase: { 2802d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " 2812d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor "should have been unpacked before we got here"); 2822d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor break; 2832d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor } 2842d6b0e94db30c0e2754d270753c6f75478e451bfDouglas Gregor 285f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_GetObjCProperty: { 286f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall LValue LV = CGF.EmitLValue(E->getSubExpr()); 287f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall assert(LV.isPropertyRef()); 288f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall RValue RV = CGF.EmitLoadOfPropertyRefLValue(LV, getReturnValueSlot()); 289f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall EmitGCMove(E, RV); 290f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall break; 291f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall } 292f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall 293f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall case CK_LValueToRValue: // hope for downstream optimization 2942de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_NoOp: 2952de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_UserDefinedConversion: 2962de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_ConstructorConversion: 2973016842613674ab80796567239c15d529aff1458Anders Carlsson assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 2983016842613674ab80796567239c15d529aff1458Anders Carlsson E->getType()) && 2993016842613674ab80796567239c15d529aff1458Anders Carlsson "Implicit cast types must be compatible"); 3003016842613674ab80796567239c15d529aff1458Anders Carlsson Visit(E->getSubExpr()); 3013016842613674ab80796567239c15d529aff1458Anders Carlsson break; 3020ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall 3032de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall case CK_LValueBitCast: 3040ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("should not be emitting lvalue bitcast as rvalue"); 305e39a3894513349908cdb3beba2614e53cb288e6cDouglas Gregor break; 3060ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall 3070ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_Dependent: 3080ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BitCast: 3090ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ArrayToPointerDecay: 3100ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FunctionToPointerDecay: 3110ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToPointer: 3120ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_NullToMemberPointer: 3130ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_BaseToDerivedMemberPointer: 3140ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_DerivedToBaseMemberPointer: 3150ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_MemberPointerToBoolean: 3160ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToPointer: 3170ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToIntegral: 3180ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_PointerToBoolean: 3190ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ToVoid: 3200ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_VectorSplat: 3210ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralCast: 3220ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToBoolean: 3230ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralToFloating: 3240ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToIntegral: 3250ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingToBoolean: 3260ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingCast: 3270ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToObjCPointerCast: 3280ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_AnyPointerToBlockPointerCast: 3290ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_ObjCObjectLValueCast: 3300ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingRealToComplex: 3310ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToReal: 3320ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToBoolean: 3330ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexCast: 3340ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_FloatingComplexToIntegralComplex: 3350ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralRealToComplex: 3360ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToReal: 3370ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToBoolean: 3380ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexCast: 3390ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall case CK_IntegralComplexToFloatingComplex: 3400ae287a498b8cec2086fe6b7e753cbb3df63e74aJohn McCall llvm_unreachable("cast kind invalid for aggregate types"); 3413016842613674ab80796567239c15d529aff1458Anders Carlsson } 342e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 343e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 3449619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 345e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson if (E->getCallReturnType()->isReferenceType()) { 346e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson EmitAggLoadOfLValue(E); 347e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson return; 348e70e8f7fef3efb3d526ee25b3a0e2a4bf67a04b6Anders Carlsson } 3491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 350fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); 351fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall EmitGCMove(E, RV); 352796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 3539619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 3549619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 355fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 356fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall EmitGCMove(E, RV); 3578fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 358796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 3599c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 360f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall llvm_unreachable("direct property access not surrounded by " 361f6a1648197562e0b133440d612d9af297d0a86ccJohn McCall "lvalue-to-rvalue cast"); 3625daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 3635daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 3649619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 3652a41637a995affa1563f4d82a8b026e326a2faa0John McCall CGF.EmitIgnoredExpr(E->getLHS()); 366558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getRHS()); 36707fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 36807fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 369b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 370558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCompoundStmt(*E->getSubStmt(), true, Dest); 371b2d963f527674275c9109252474948368b6e6161Chris Lattner} 372b2d963f527674275c9109252474948368b6e6161Chris Lattner 3739c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 3742de56d1d0c3a504ad1529de2677628bdfbb95cd4John McCall if (E->getOpcode() == BO_PtrMemD || E->getOpcode() == BO_PtrMemI) 3758bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian VisitPointerToDataMemberBinaryOperator(E); 3768bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian else 3778bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian CGF.ErrorUnsupported(E, "aggregate binary expression"); 3788bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian} 3798bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian 3808bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanianvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 3818bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian const BinaryOperator *E) { 3828bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 3838bfd31f9dad09cd52225d868bbd92a9bebe87775Fariborz Jahanian EmitFinalDestCopy(E, LV); 384ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 385ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 38603d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 387ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 388ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 3892dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 3902dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman E->getRHS()->getType()) 391ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 3929c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 393883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 3947f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 3957f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 3967f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 397558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(E->getRHS()->getType()); 398558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitAggExpr(E->getRHS(), Slot); 399119a1c6c4029d30cae7b31a2826aa0ff70d01668John McCall CGF.EmitStoreThroughPropertyRefLValue(Slot.asRValue(), LHS); 4007f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 401474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool GCollection = false; 402fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall if (CGF.getContext().getLangOptions().getGCMode()) 403474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian GCollection = TypeRequiresGCollection(E->getLHS()->getType()); 404fa037bd3f79d3c70197a3224bb1b29c6c4af0098John McCall 4057f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 406474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian AggValueSlot LHSSlot = AggValueSlot::forLValue(LHS, true, 407474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian GCollection); 408474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian CGF.EmitAggExpr(E->getRHS(), LHSSlot, false); 40949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump EmitFinalDestCopy(E, LHS, true); 4107f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 411883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 412883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 4139c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 4148e274bd14bcca8466542477844b88e90e90cde1aEli Friedman if (!E->getLHS()) { 4158e274bd14bcca8466542477844b88e90e90cde1aEli Friedman CGF.ErrorUnsupported(E, "conditional operator with missing LHS"); 4168e274bd14bcca8466542477844b88e90e90cde1aEli Friedman return; 4178e274bd14bcca8466542477844b88e90e90cde1aEli Friedman } 4188e274bd14bcca8466542477844b88e90e90cde1aEli Friedman 4199615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 4209615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 4219615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 4221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4238e274bd14bcca8466542477844b88e90e90cde1aEli Friedman CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 4241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 42572119a887c4af39c90f10b6bdc158389071f42eaAnders Carlsson CGF.BeginConditionalBranch(); 4269c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(LHSBlock); 4271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 42874fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // Save whether the destination's lifetime is externally managed. 42974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall bool DestLifetimeManaged = Dest.isLifetimeExternallyManaged(); 430883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 431c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getLHS()); 43272119a887c4af39c90f10b6bdc158389071f42eaAnders Carlsson CGF.EndConditionalBranch(); 433d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 4341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 43572119a887c4af39c90f10b6bdc158389071f42eaAnders Carlsson CGF.BeginConditionalBranch(); 4369c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(RHSBlock); 4371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 43874fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // If the result of an agg expression is unused, then the emission 43974fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // of the LHS might need to create a destination slot. That's fine 44074fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // with us, and we can safely emit the RHS into the same slot, but 44174fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall // we shouldn't claim that its lifetime is externally managed. 44274fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall Dest.setLifetimeExternallyManaged(DestLifetimeManaged); 44374fb0edb44b7ed52af9b8053032ccaab29b5c0ccJohn McCall 444c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getRHS()); 44572119a887c4af39c90f10b6bdc158389071f42eaAnders Carlsson CGF.EndConditionalBranch(); 446d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 4471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4489c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 449883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 450ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 451a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlssonvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 452a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson Visit(CE->getChosenSubExpr(CGF.getContext())); 453a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson} 454a294ca8c64fbb345f32e4af9d8fabdf2f64e4883Anders Carlsson 455b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 4560785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 457ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 458ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 4590262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 460ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 4610262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 4620262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 4630262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 46479c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(VE, CGF.MakeAddrLValue(ArgPtr, VE->getType())); 465b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 466b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 467b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlssonvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 468558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Ensure that we have a slot, but if we already do, remember 469558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // whether its lifetime was externally managed. 470558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall bool WasManaged = Dest.isLifetimeExternallyManaged(); 471558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest = EnsureSlot(E->getType()); 472558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Dest.setLifetimeExternallyManaged(); 473558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 474558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall Visit(E->getSubExpr()); 475558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 476558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // Set up the temporary's destructor if its lifetime wasn't already 477558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall // being managed. 478558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall if (!WasManaged) 479558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXTemporary(E->getTemporary(), Dest.getAddr()); 480b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson} 481b58d017f2b9eeed33f2ab3ede968b89cf5296bf2Anders Carlsson 482b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 48331ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 484558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(E->getType()); 485558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXConstructExpr(E, Slot); 4867f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson} 4877f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 4887f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlssonvoid AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 489558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall CGF.EmitCXXExprWithTemporaries(E, Dest); 490b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 491b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 492ed8abf18329df67b0abcbb3a10458bd8c1d2a595Douglas Gregorvoid AggExprEmitter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) { 493558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 494558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 495558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T), T); 49630311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson} 49730311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlsson 49830311fa6b0735b9cb73b01e25bf9652a4b9b0c53Anders Carlssonvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 499558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall QualType T = E->getType(); 500558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall AggValueSlot Slot = EnsureSlot(T); 501558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall EmitNullInitializationToLValue(CGF.MakeAddrLValue(Slot.getAddr(), T), T); 502329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes} 503329763b1e9ec8c216025e3a8379ed446d7372cbcNuno Lopes 5041b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// isSimpleZero - If emitting this value will obviously just cause a store of 5051b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zero to memory, return true. This can return false if uncertain, so it just 5061b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// handles simple cases. 5071b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic bool isSimpleZero(const Expr *E, CodeGenFunction &CGF) { 5081b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // (0) 5091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) 5101b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return isSimpleZero(PE->getSubExpr(), CGF); 5111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 5121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) 5131b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return IL->getValue() == 0; 5141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // +0.0 5151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(E)) 5161b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return FL->getValue().isPosZero(); 5171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // int() 5181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if ((isa<ImplicitValueInitExpr>(E) || isa<CXXScalarValueInitExpr>(E)) && 5191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 5201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return true; 5211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // (int*)0 - Null pointer expressions. 5221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CastExpr *ICE = dyn_cast<CastExpr>(E)) 5231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return ICE->getCastKind() == CK_NullToPointer; 5241b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // '\0' 5251b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) 5261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return CL->getValue() == 0; 5271b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5281b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Otherwise, hard case: conservatively return false. 5291b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return false; 5301b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 5311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 5321b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 53378e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlssonvoid 53478e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders CarlssonAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV, QualType T) { 5357f79f9be5916c51c35da4f126b7c12596a101607Mike Stump // FIXME: Ignore result? 536f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 5371b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Dest.isZeroed() && isSimpleZero(E, CGF)) { 5381b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Storing "i32 0" to a zero'd memory location is a noop. 5391b726771d00762fb5c4c2638e60d134c385493aeChris Lattner } else if (isa<ImplicitValueInitExpr>(E)) { 54078e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson EmitNullInitializationToLValue(LV, T); 541e78ccb4d609a113c3e06a9c4583e845e90b1a037Anders Carlsson } else if (T->isReferenceType()) { 54232f36baa6c8d491c374af622b4e3ac28d597453cAnders Carlsson RValue RV = CGF.EmitReferenceBindingToExpr(E, /*InitializedDecl=*/0); 543e78ccb4d609a113c3e06a9c4583e845e90b1a037Anders Carlsson CGF.EmitStoreThroughLValue(RV, LV, T); 54478e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson } else if (T->isAnyComplexType()) { 5453498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 54678e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson } else if (CGF.hasAggregateLLVMType(T)) { 5471b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.EmitAggExpr(E, AggValueSlot::forAddr(LV.getAddress(), false, true, 5481b726771d00762fb5c4c2638e60d134c385493aeChris Lattner false, Dest.isZeroed())); 549c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 5502a41637a995affa1563f4d82a8b026e326a2faa0John McCall CGF.EmitStoreThroughLValue(RValue::get(CGF.EmitScalarExpr(E)), LV, T); 551f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 552f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 553305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 554f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 5551b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the destination slot is already zeroed out before the aggregate is 5561b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // copied into it, we don't have to emit any zeros here. 5571b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Dest.isZeroed() && CGF.getTypes().isZeroInitializable(T)) 5581b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 5591b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 560f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (!CGF.hasAggregateLLVMType(T)) { 561f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 562c9c88b4159791c48e486ca94e3743b5979e2b7a6Owen Anderson llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 56382397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 564f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 565f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 566f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 567f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 5681884eb0b5c55edda4893ddec45e7dbad79758782Anders Carlsson CGF.EmitNullInitialization(LV.getAddress(), T); 569f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 570f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 571305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 572f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 573a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 57413a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // FIXME: Assess perf here? Figure out what cases are worth optimizing here 57513a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman // (Length of globals? Chunks of zeroed-out space?). 576a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 577f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 578f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 57913a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 580994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 58113a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 58213a5be10b198a5dc7e3e72c54481cd8b70f68495Eli Friedman llvm::GlobalValue::InternalLinkage, C, ""); 58379c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar EmitFinalDestCopy(E, CGF.MakeAddrLValue(GV, E->getType())); 584994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 585994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 586a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 587d0db03a561671b8b466b07026cc8fbbb037bb639Chris Lattner if (E->hadArrayRangeDesignator()) 588a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 589a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 590558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall llvm::Value *DestPtr = Dest.getAddr(); 591558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall 592f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 593f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 594f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::PointerType *APType = 595f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 596f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::ArrayType *AType = 597f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 5981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 599f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 600922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 6019619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 6029619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 6039619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 6042dce5f8a99b5c48f1287ff3941288ca6f7fde2deEli Friedman if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 6059619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 6069619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 6079619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 608922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 609922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 610f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 611c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 6124c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 6131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6140953e767ff7817f97b3ab20896b229891eeff45bJohn McCall // FIXME: were we intentionally ignoring address spaces and GC attributes? 6151e692ace08959399794363e77499b73da5494af9Eli Friedman 616f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner for (uint64_t i = 0; i != NumArrayElements; ++i) { 6171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If we're done emitting initializers and the destination is known-zeroed 6181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // then we're done. 6191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (i == NumInitElements && 6201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Dest.isZeroed() && 6211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(ElementType)) 6221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner break; 6231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 624f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 6259f553f5b3bd45304dfda6bdc5cd2baac64b3315bDaniel Dunbar LValue LV = CGF.MakeAddrLValue(NextVal, ElementType); 6261b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 627f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (i < NumInitElements) 6289f553f5b3bd45304dfda6bdc5cd2baac64b3315bDaniel Dunbar EmitInitializationToLValue(E->getInit(i), LV, ElementType); 629f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 6309f553f5b3bd45304dfda6bdc5cd2baac64b3315bDaniel Dunbar EmitNullInitializationToLValue(LV, ElementType); 6311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 6321b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the GEP didn't get used because of a dead zero init or something 6331b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // else, clean it up for -O0 builds and general tidiness. 6341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (llvm::GetElementPtrInst *GEP = 6351b726771d00762fb5c4c2638e60d134c385493aeChris Lattner dyn_cast<llvm::GetElementPtrInst>(NextVal)) 6361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (GEP->use_empty()) 6371b726771d00762fb5c4c2638e60d134c385493aeChris Lattner GEP->eraseFromParent(); 638f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 639305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 640f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 6411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 642f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 6431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 644f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 645f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 646f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 647f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 648f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 6496217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 650bd7de38eae1fc20ee88db63f469c54241bc240f8Chris Lattner 6510bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (E->getType()->isUnionType()) { 6520bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 6530bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 6540bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 6550bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 6561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6570bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 6580bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 6590bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 66017945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis for (RecordDecl::field_iterator Field = SD->field_begin(), 66117945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis FieldEnd = SD->field_end(); 6620bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 6630bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 6640bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 6650bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 6660bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 6670bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 6680bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 6690bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 6700bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 6711b726771d00762fb5c4c2638e60d134c385493aeChris Lattner LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 6720bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 6730bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 67478e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson EmitInitializationToLValue(E->getInit(0), FieldLoc, Field->getType()); 6750bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 6761b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Default-initialize to null. 6770bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 6780bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 6790bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 6800bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 6810bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 6821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 683f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 684f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 685bd7de38eae1fc20ee88db63f469c54241bc240f8Chris Lattner unsigned CurInitVal = 0; 68617945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis for (RecordDecl::field_iterator Field = SD->field_begin(), 68717945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis FieldEnd = SD->field_end(); 68844b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor Field != FieldEnd; ++Field) { 68944b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor // We're done once we hit the flexible array member 69044b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor if (Field->getType()->isIncompleteArrayType()) 69144b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 69244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 69334e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor if (Field->isUnnamedBitfield()) 694f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 69534e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 6961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Don't emit GEP before a noop store of zero. 6971b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (CurInitVal == NumInitElements && Dest.isZeroed() && 6981b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getTypes().isZeroInitializable(E->getType())) 6991b726771d00762fb5c4c2638e60d134c385493aeChris Lattner break; 7001b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7011e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 702e78ccb4d609a113c3e06a9c4583e845e90b1a037Anders Carlsson LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, *Field, 0); 70314674ffb81dccbc4e1bf78ab5b7987685819b445Fariborz Jahanian // We never generate write-barries for initialized fields. 704ea619177353e0a9f35b7d926a92df0e103515dbeDaniel Dunbar FieldLoc.setNonGC(true); 7051b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 706f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (CurInitVal < NumInitElements) { 707b35baae19b906245b5c2266b47ef411abcc6b25aChris Lattner // Store the initializer into the field. 708b35baae19b906245b5c2266b47ef411abcc6b25aChris Lattner EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc, 70978e83f881e59d4b8648a7b85ec6f2d36ef5cc680Anders Carlsson Field->getType()); 710f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 711f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 71244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 713f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 7141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the GEP didn't get used because of a dead zero init or something 7161b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // else, clean it up for -O0 builds and general tidiness. 7171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (FieldLoc.isSimple()) 7181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (llvm::GetElementPtrInst *GEP = 7191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner dyn_cast<llvm::GetElementPtrInst>(FieldLoc.getAddress())) 7201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (GEP->use_empty()) 7211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner GEP->eraseFromParent(); 722145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 723636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 724636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 725ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 726ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 727ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 728ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 7291b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// GetNumNonZeroBytesInInit - Get an approximate count of the number of 7301b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// non-zero bytes that will be stored when outputting the initializer for the 7311b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// specified initializer expression. 7321b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic uint64_t GetNumNonZeroBytesInInit(const Expr *E, CodeGenFunction &CGF) { 7331b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) 7341b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return GetNumNonZeroBytesInInit(PE->getSubExpr(), CGF); 7351b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7361b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // 0 and 0.0 won't require any non-zero stores! 7371b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (isSimpleZero(E, CGF)) return 0; 7381b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7391b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If this is an initlist expr, sum up the size of sizes of the (present) 7401b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // elements. If this is something weird, assume the whole thing is non-zero. 7411b726771d00762fb5c4c2638e60d134c385493aeChris Lattner const InitListExpr *ILE = dyn_cast<InitListExpr>(E); 7421b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (ILE == 0 || !CGF.getTypes().isZeroInitializable(ILE->getType())) 7431b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return CGF.getContext().getTypeSize(E->getType())/8; 7441b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 745d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // InitListExprs for structs have to be handled carefully. If there are 746d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // reference members, we need to consider the size of the reference, not the 747d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner // referencee. InitListExprs for unions and arrays can't have references. 7488c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (const RecordType *RT = E->getType()->getAs<RecordType>()) { 7498c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (!RT->isUnionType()) { 7508c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 7518c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner uint64_t NumNonZeroBytes = 0; 752d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 7538c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner unsigned ILEElement = 0; 7548c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner for (RecordDecl::field_iterator Field = SD->field_begin(), 7558c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner FieldEnd = SD->field_end(); Field != FieldEnd; ++Field) { 7568c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // We're done once we hit the flexible array member or run out of 7578c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // InitListExpr elements. 7588c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isIncompleteArrayType() || 7598c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner ILEElement == ILE->getNumInits()) 7608c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner break; 7618c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->isUnnamedBitfield()) 7628c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner continue; 7638c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 7648c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner const Expr *E = ILE->getInit(ILEElement++); 7658c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner 7668c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner // Reference values are always non-null and have the width of a pointer. 7678c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner if (Field->getType()->isReferenceType()) 7688c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner NumNonZeroBytes += CGF.getContext().Target.getPointerWidth(0); 7698c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner else 7708c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(E, CGF); 7718c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner } 772d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 7738c00ad1e3897e8a00f41bbd52135be8390d5c15cChris Lattner return NumNonZeroBytes; 774d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 775d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner } 776d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 777d1d56df188e25c633f9bc65d229897b42442b0f7Chris Lattner 7781b726771d00762fb5c4c2638e60d134c385493aeChris Lattner uint64_t NumNonZeroBytes = 0; 7791b726771d00762fb5c4c2638e60d134c385493aeChris Lattner for (unsigned i = 0, e = ILE->getNumInits(); i != e; ++i) 7801b726771d00762fb5c4c2638e60d134c385493aeChris Lattner NumNonZeroBytes += GetNumNonZeroBytesInInit(ILE->getInit(i), CGF); 7811b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return NumNonZeroBytes; 7821b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 7831b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7841b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// CheckAggExprForMemSetUse - If the initializer is large and has a lot of 7851b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// zeros in it, emit a memset and avoid storing the individual zeros. 7861b726771d00762fb5c4c2638e60d134c385493aeChris Lattner/// 7871b726771d00762fb5c4c2638e60d134c385493aeChris Lattnerstatic void CheckAggExprForMemSetUse(AggValueSlot &Slot, const Expr *E, 7881b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CodeGenFunction &CGF) { 7891b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the slot is already known to be zeroed, nothing to do. Don't mess with 7901b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // volatile stores. 7911b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (Slot.isZeroed() || Slot.isVolatile() || Slot.getAddr() == 0) return; 7921b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7931b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // If the type is 16-bytes or smaller, prefer individual stores over memset. 7941b726771d00762fb5c4c2638e60d134c385493aeChris Lattner std::pair<uint64_t, unsigned> TypeInfo = 7951b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.getContext().getTypeInfo(E->getType()); 7961b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (TypeInfo.first/8 <= 16) 7971b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 7981b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 7991b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Check to see if over 3/4 of the initializer are known to be zero. If so, 8001b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // we prefer to emit memset + individual stores for the rest. 8011b726771d00762fb5c4c2638e60d134c385493aeChris Lattner uint64_t NumNonZeroBytes = GetNumNonZeroBytesInInit(E, CGF); 8021b726771d00762fb5c4c2638e60d134c385493aeChris Lattner if (NumNonZeroBytes*4 > TypeInfo.first/8) 8031b726771d00762fb5c4c2638e60d134c385493aeChris Lattner return; 8041b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8051b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Okay, it seems like a good idea to use an initial memset, emit the call. 8061b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::Constant *SizeVal = CGF.Builder.getInt64(TypeInfo.first/8); 8071b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::ConstantInt *AlignVal = CGF.Builder.getInt32(TypeInfo.second/8); 8081b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8091b726771d00762fb5c4c2638e60d134c385493aeChris Lattner llvm::Value *Loc = Slot.getAddr(); 8101b726771d00762fb5c4c2638e60d134c385493aeChris Lattner const llvm::Type *BP = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); 8111b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8121b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Loc = CGF.Builder.CreateBitCast(Loc, BP); 8131b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.Builder.CreateCall5(CGF.CGM.getMemSetFn(Loc->getType(), 8141b726771d00762fb5c4c2638e60d134c385493aeChris Lattner SizeVal->getType()), 8151b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Loc, CGF.Builder.getInt8(0), SizeVal, AlignVal, 8161b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CGF.Builder.getFalse()); 8171b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8181b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Tell the AggExprEmitter that the slot is known zero. 8191b726771d00762fb5c4c2638e60d134c385493aeChris Lattner Slot.setZeroed(); 8201b726771d00762fb5c4c2638e60d134c385493aeChris Lattner} 8211b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8221b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8231b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8241b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 825e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// EmitAggExpr - Emit the computation of the specified expression of aggregate 826e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// type. The result is computed into DestPtr. Note that if DestPtr is null, 827e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// the value of the aggregate expression is not needed. If VolatileDest is 828e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// true, DestPtr cannot be 0. 829558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// 830558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// \param IsInitializer - true if this evaluation is initializing an 831558d2abc7f9fd6801cc7677200992313ae90b5d8John McCall/// object whose lifetime is already being managed. 83218aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar// 83318aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar// FIXME: Take Qualifiers object. 834558d2abc7f9fd6801cc7677200992313ae90b5d8John McCallvoid CodeGenFunction::EmitAggExpr(const Expr *E, AggValueSlot Slot, 835474e2fe4957e6e72cee36ed189eaf21878ad0e91Fariborz Jahanian bool IgnoreResult) { 836ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 837ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 8381b726771d00762fb5c4c2638e60d134c385493aeChris Lattner assert((Slot.getAddr() != 0 || Slot.isIgnored()) && 8391b726771d00762fb5c4c2638e60d134c385493aeChris Lattner "slot has bits but no address"); 8401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8411b726771d00762fb5c4c2638e60d134c385493aeChris Lattner // Optimize the slot if possible. 8421b726771d00762fb5c4c2638e60d134c385493aeChris Lattner CheckAggExprForMemSetUse(Slot, E, *this); 8431b726771d00762fb5c4c2638e60d134c385493aeChris Lattner 8441b726771d00762fb5c4c2638e60d134c385493aeChris Lattner AggExprEmitter(*this, Slot, IgnoreResult).Visit(const_cast<Expr*>(E)); 845ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 8467482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 84718aba0dd518e486d8b50523e7dafb4b5657135d2Daniel DunbarLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 84818aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 849195337d2e5d4625ae9dc1328c7cdbc7115b0261bDaniel Dunbar llvm::Value *Temp = CreateMemTemp(E->getType()); 85079c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar LValue LV = MakeAddrLValue(Temp, E->getType()); 8511b726771d00762fb5c4c2638e60d134c385493aeChris Lattner EmitAggExpr(E, AggValueSlot::forAddr(Temp, LV.isVolatileQualified(), false)); 85279c3928d816f317dd27109fb92e7d190c1c68329Daniel Dunbar return LV; 85318aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar} 85418aba0dd518e486d8b50523e7dafb4b5657135d2Daniel Dunbar 8557482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 85627fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump llvm::Value *SrcPtr, QualType Ty, 85727fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump bool isVolatile) { 8587482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 8591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8600d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (getContext().getLangOptions().CPlusPlus) { 8610d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson if (const RecordType *RT = Ty->getAs<RecordType>()) { 862e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 863e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor assert((Record->hasTrivialCopyConstructor() || 8641d49f2112572c247ff9c209de112fbf5d9ecf765Fariborz Jahanian Record->hasTrivialCopyAssignment()) && 865e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "Trying to aggregate-copy a type without a trivial copy " 866e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor "constructor or assignment operator"); 867419aa964ae845aa5b1183fabb2f1cff78faaedddDouglas Gregor // Ignore empty classes in C++. 868e9979484670ca2b528146d1b681e149fdc29f7ccDouglas Gregor if (Record->isEmpty()) 8690d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson return; 8700d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 8710d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson } 8720d7c583a4b4d0f57c6b69c66fd73babec4ef3799Anders Carlsson 87383c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 874ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 875ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 876ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 877ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 878ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 87983c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 880ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 881ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 882ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 8831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8847482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 8857482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 8861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8877482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 8881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 889fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 890fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 891fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 892fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 893fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 894fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 895fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 896fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 897fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 898fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 8993ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang // we need to use a different call here. We use isVolatile to indicate when 90049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // either the source or the destination is volatile. 9013ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 9023ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang const llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 903098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner const llvm::Type *DBP = 904098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner llvm::Type::getInt8PtrTy(VMContext, DPT->getAddressSpace()); 905098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); 9063ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 9073ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang const llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 908098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner const llvm::Type *SBP = 909098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner llvm::Type::getInt8PtrTy(VMContext, SPT->getAddressSpace()); 910098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); 9113ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang 91255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (const RecordType *RecordTy = Ty->getAs<RecordType>()) { 91355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian RecordDecl *Record = RecordTy->getDecl(); 91455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (Record->hasObjectMember()) { 91555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian unsigned long size = TypeInfo.first/8; 91655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 91755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); 91855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 91955bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 92055bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 92155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 92255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } else if (getContext().getAsArrayType(Ty)) { 92355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian QualType BaseType = getContext().getBaseElementType(Ty); 92455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { 92555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian if (RecordTy->getDecl()->hasObjectMember()) { 92655bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian unsigned long size = TypeInfo.first/8; 92755bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); 92855bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian llvm::Value *SizeVal = llvm::ConstantInt::get(SizeTy, size); 92955bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian CGM.getObjCRuntime().EmitGCMemmoveCollectable(*this, DestPtr, SrcPtr, 93055bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian SizeVal); 93155bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian return; 93255bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 93355bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 93455bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian } 93555bcace250e1ff366e4482714b344b8cbc8be5f3Fariborz Jahanian 9363ecd785aff34381f3704d9cb28fe3ef85af759deMon P Wang Builder.CreateCall5(CGM.getMemCpyFn(DestPtr->getType(), SrcPtr->getType(), 93777b89b87c3b9220fea1bc80f6d6598d2003cc8a8Chris Lattner IntPtrTy), 9387482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr, SrcPtr, 9397482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // TypeInfo.first describes size in bits. 94077b89b87c3b9220fea1bc80f6d6598d2003cc8a8Chris Lattner llvm::ConstantInt::get(IntPtrTy, TypeInfo.first/8), 941098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner Builder.getInt32(TypeInfo.second/8), 942098432c3119cd4e421a2b906d06187b004d3a86bChris Lattner Builder.getInt1(isVolatile)); 9437482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 944