CGExprAgg.cpp revision ff4bf3bd6174f6a02da4ee2efc6064c005295d44
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" 16de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/ASTContext.h" 17b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson#include "clang/AST/DeclCXX.h" 18de7fb8413b13651fd85b7125d08b3c9ac2816d9dDaniel Dunbar#include "clang/AST/StmtVisitor.h" 19883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner#include "llvm/Constants.h" 20883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner#include "llvm/Function.h" 21636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel#include "llvm/GlobalVariable.h" 229c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner#include "llvm/Support/Compiler.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 { 329c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnerclass VISIBILITY_HIDDEN AggExprEmitter : public StmtVisitor<AggExprEmitter> { 339c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CodeGenFunction &CGF; 3445d196b8387dcefc4df26cda114fa34c6528e928Daniel Dunbar CGBuilderTy &Builder; 359c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner llvm::Value *DestPtr; 369c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner bool VolatileDest; 3749d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump bool IgnoreResult; 3849d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump 399c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnerpublic: 40ff4bf3bd6174f6a02da4ee2efc6064c005295d44Mike Stump AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool v, 41ff4bf3bd6174f6a02da4ee2efc6064c005295d44Mike Stump bool ignore) 42bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner : CGF(cgf), Builder(CGF.Builder), 43ff4bf3bd6174f6a02da4ee2efc6064c005295d44Mike Stump DestPtr(destPtr), VolatileDest(v), IgnoreResult(ignore) { 449c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 459c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 46ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 47ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Utilities 48ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 49ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 509c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// EmitAggLoadOfLValue - Given an expression with aggregate type that 519c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// represents a value lvalue, this method emits the address of the lvalue, 529c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// then loads the result into DestPtr. 539c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void EmitAggLoadOfLValue(const Expr *E); 54922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 554ac20ddc7ab324a59862657f756bdd060076b137Mike Stump /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 5649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 5749d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 584ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 59ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 60ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 61ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 62ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 639c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 64488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 659c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 669c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 6712444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 689c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 699c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 709b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 719b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 729b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 73ad6ebd6efcc30cc54540ed9d92256b410519ec0fSeo Sanghyeon void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 74f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 75f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 76f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 779b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 789b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 799b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 80f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 81f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 82f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 83f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 84f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 85f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 864c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor 879c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 887e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes void VisitCStyleCastExpr(CStyleCastExpr *E); 89e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson void VisitImplicitCastExpr(ImplicitCastExpr *E); 90148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 91b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 929c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 9303d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 9407fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 959c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 968fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 970a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 980a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 990a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 1009c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 1015daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian void VisitObjCKVCRefExpr(ObjCKVCRefExpr *E); 1029c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1039c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitConditionalOperator(const ConditionalOperator *CO); 104636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 10504421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 10604421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 10704421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 10831ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 1097f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 1107f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 111b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 112f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 113f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitInitializationToLValue(Expr *E, LValue Address); 114f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitNullInitializationToLValue(LValue Address, QualType T); 1159c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 116305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 1179c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1189c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1199c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 120ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 121ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 122ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1239c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 124883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 125883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 126883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1279c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1289c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1294ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1304ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1314ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1324ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 13349d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 1344ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 1354ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 136883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // If the result is ignored, don't copy from the value. 1379ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump if (DestPtr == 0) { 13849d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump if (!Src.isVolatileQualified() || (IgnoreResult && Ignore)) 1399ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 14049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // If the source is volatile, we must read from it; to do that, we need 14149d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // some place to put it. 14249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump DestPtr = CGF.CreateTempAlloca(CGF.ConvertType(E->getType()), "agg.tmp"); 1439ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 144883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 1454ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 1464ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 1474ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 1484ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 14927fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType(), 15027fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump VolatileDest|Src.isVolatileQualified()); 1514ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1524ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1534ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 15449d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 1554ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 1564ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1574ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 15849d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Src.isVolatileQualified()), 15949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump Ignore); 160883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 161883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 162ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 163ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 164ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 165ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 1667e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopesvoid AggExprEmitter::VisitCStyleCastExpr(CStyleCastExpr *E) { 1677e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes // GCC union extension 1687e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes if (E->getType()->isUnionType()) { 1697e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 1706ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, 1716ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor *SD->field_begin(CGF.getContext()), 1726ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor true, 0); 1737e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes EmitInitializationToLValue(E->getSubExpr(), FieldLoc); 1747e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes return; 1757e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 1767e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1777e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes Visit(E->getSubExpr()); 1787e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes} 1797e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1809619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitImplicitCastExpr(ImplicitCastExpr *E) { 181ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 1829619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getSubExpr()->getType().getUnqualifiedType(), 1839619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getType().getUnqualifiedType()) && 1849619662a1d42e2008b865d3459c0677e149dad1bChris Lattner "Implicit cast types must be compatible"); 185e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson Visit(E->getSubExpr()); 186e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 187e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 1889619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 189148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson RValue RV = CGF.EmitCallExpr(E); 1904ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 191796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 1929619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 1939619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 1948f2926b73ed635afecd020da787af6a837601a2bDaniel Dunbar RValue RV = CGF.EmitObjCMessageExpr(E); 1954ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 1968fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 197796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 1989c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 1999c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar RValue RV = CGF.EmitObjCPropertyGet(E); 2004ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 2015daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 2025daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 2035daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanianvoid AggExprEmitter::VisitObjCKVCRefExpr(ObjCKVCRefExpr *E) { 2045daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian RValue RV = CGF.EmitObjCPropertyGet(E); 2054ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 206148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson} 207148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson 2089619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 2099ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump CGF.EmitAnyExpr(E->getLHS()); 210f1b97f28a53ee09fa2bc38790d964cda3811bdc6Mike Stump CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest); 21107fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 21207fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 213b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 214b2d963f527674275c9109252474948368b6e6161Chris Lattner CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 215b2d963f527674275c9109252474948368b6e6161Chris Lattner} 216b2d963f527674275c9109252474948368b6e6161Chris Lattner 2179c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 218488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(E, "aggregate binary expression"); 219ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 220ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 22103d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 222ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 223ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 224ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 225ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getLHS()->getType().getUnqualifiedType(), 226ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getRHS()->getType().getUnqualifiedType()) 227ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 2289c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 229883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2307f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 2317f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 2327f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 2337f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar llvm::Value *AggLoc = DestPtr; 2347f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (!AggLoc) 2357f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 236240993d17d2b51c78d52df8743bdee4177960341Mike Stump CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 2377f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 238240993d17d2b51c78d52df8743bdee4177960341Mike Stump RValue::getAggregate(AggLoc, VolatileDest)); 23943f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian } 24043f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian else if (LHS.isKVCRef()) { 24143f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian llvm::Value *AggLoc = DestPtr; 24243f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian if (!AggLoc) 24343f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 244a49af1a4283bfeda1f418a03fd6af04bab79551dMike Stump CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 24543f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 246a49af1a4283bfeda1f418a03fd6af04bab79551dMike Stump RValue::getAggregate(AggLoc, VolatileDest)); 2477f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 2487f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 249fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified()); 25049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump EmitFinalDestCopy(E, LHS, true); 2517f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 252883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 253883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2549c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 2559615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 2569615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 2579615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 258883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2599c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond()); 260bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner Builder.CreateCondBr(Cond, LHSBlock, RHSBlock); 261883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2629c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(LHSBlock); 263883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 264883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // Handle the GNU extension for missing LHS. 265883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner assert(E->getLHS() && "Must have LHS for aggregate value"); 266883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 267c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getLHS()); 268d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 269883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2709c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(RHSBlock); 271883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 272c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getRHS()); 273d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 274883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2759c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 276883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 277ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 278b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 2790785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 280ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 281ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 2820262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 283ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 2840262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 2850262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 2860262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 2874ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, 0)); 288b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 289b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 290b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 29131ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 2927f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson llvm::Value *V = DestPtr; 2937f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 2947f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson if (!V) { 2957f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson assert(isa<CXXTempVarDecl>(E->getVarDecl()) && 2967f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson "Must have a temp var decl when there's no destination!"); 2977f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 2987f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson V = CGF.CreateTempAlloca(CGF.ConvertType(E->getVarDecl()->getType()), 2997f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson "tmpvar"); 3007f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson } 301b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 3027f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson CGF.EmitCXXConstructExpr(V, E); 3037f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson} 3047f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 3057f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlssonvoid AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 3067f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson // FIXME: Do something with the temporaries! 3077f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson Visit(E->getSubExpr()); 308b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 309b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 310f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 311f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 3123498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor if (isa<ImplicitValueInitExpr>(E)) { 3134c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor EmitNullInitializationToLValue(LV, E->getType()); 3143498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor } else if (E->getType()->isComplexType()) { 3153498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 316c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else if (CGF.hasAggregateLLVMType(E->getType())) { 317c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitAnyExpr(E, LV.getAddress(), false); 318c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 319c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, E->getType()); 320f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 321f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 322305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 323f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 324f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (!CGF.hasAggregateLLVMType(T)) { 325f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 32682397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 32782397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 328f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 329f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Otherwise, just memset the whole thing to zero. This is legal 330f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // because in LLVM, all default initializers are guaranteed to have a 331f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // bit pattern of all zeros. 3320f59312e7b625fa5821a63db65377d4b3b667e99Eli Friedman // FIXME: That isn't true for member pointers! 333f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 334f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 335f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 336ccf0ed885952a52caa25767c787e0bf29f4688bdEli Friedman CGF.EmitMemSetToZero(LV.getAddress(), T); 337f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 338f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 339305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 340f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 341a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 342a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // FIXME: Disabled while we figure out what to do about 343a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // test/CodeGen/bitfield.c 344a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 345f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 346f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 347f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // FIXME: Should we really be doing this? Should we try to avoid cases where 348f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // we emit a global with a lot of zeros? Should we try to avoid short 349f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals? 350c9e8f606787b0bc0c3b08e566b87cc1751694168Eli Friedman if (E->isConstantInitializer(CGF.getContext(), 0)) { 351994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, &CGF); 352994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 353994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman new llvm::GlobalVariable(C->getType(), true, 354994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalValue::InternalLinkage, 355994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman C, "", &CGF.CGM.getModule(), 0); 3564ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LValue::MakeAddr(GV, 0)); 357994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 358994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 359a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 360a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor if (E->hadArrayRangeDesignator()) { 361a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 362a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor } 363a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 364f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 365f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 366f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::PointerType *APType = 367f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 368f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::ArrayType *AType = 369f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 370f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 371f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 372922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 3739619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 3749619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 3759619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 3769619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (CGF.getContext().getCanonicalType(T1).getUnqualifiedType() == 3779619662a1d42e2008b865d3459c0677e149dad1bChris Lattner CGF.getContext().getCanonicalType(T2).getUnqualifiedType()) { 3789619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 3799619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 3809619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 381922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 382922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 383f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 384c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 3854c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 386f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 387c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner unsigned CVRqualifier = ElementType.getCVRQualifiers(); 3881e692ace08959399794363e77499b73da5494af9Eli Friedman 389f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner for (uint64_t i = 0; i != NumArrayElements; ++i) { 390f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 391f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (i < NumInitElements) 3921e692ace08959399794363e77499b73da5494af9Eli Friedman EmitInitializationToLValue(E->getInit(i), 3931e692ace08959399794363e77499b73da5494af9Eli Friedman LValue::MakeAddr(NextVal, CVRqualifier)); 394f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 3951e692ace08959399794363e77499b73da5494af9Eli Friedman EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, CVRqualifier), 396f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner ElementType); 397f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 398305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 399f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 400f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 401f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 402f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 403f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 404f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 405f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 406f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 407f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 408f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 409f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned CurInitVal = 0; 4100bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4110bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (E->getType()->isUnionType()) { 4120bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 4130bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 4140bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 4150bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 4160bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4170bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 4180bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 4190bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 4206ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4216ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 4220bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 4230bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 4240bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 4250bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4260bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4270bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4280bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 4290bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 4300bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, Field, true, 0); 4310bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 4330bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 4340bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitInitializationToLValue(E->getInit(0), FieldLoc); 4350bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 4360bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Default-initialize to null 4370bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 4380bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4390bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4400bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4410bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 442f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 443f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 444f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 4456ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4466ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 44744b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor Field != FieldEnd; ++Field) { 44844b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor // We're done once we hit the flexible array member 44944b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor if (Field->getType()->isIncompleteArrayType()) 45044b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 45144b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 45234e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor if (Field->isUnnamedBitfield()) 453f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 45434e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 4551e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 4560bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, *Field, false, 0); 457f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (CurInitVal < NumInitElements) { 458f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Store the initializer into the field 459f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc); 460f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 461f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 46244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 463f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 464145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 465636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 466636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 467ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 468ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 469ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 470ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 471e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// EmitAggExpr - Emit the computation of the specified expression of aggregate 472e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// type. The result is computed into DestPtr. Note that if DestPtr is null, 473e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// the value of the aggregate expression is not needed. If VolatileDest is 474e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump/// true, DestPtr cannot be 0. 475ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattnervoid CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 47649d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump bool VolatileDest, bool IgnoreResult) { 477ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 478ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 479e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump assert ((DestPtr != 0 || VolatileDest == false) 480e1129a92b25f9b05f1b97fdd81d38ea451875414Mike Stump && "volatile aggregate can't be 0"); 481ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 48249d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump AggExprEmitter(*this, DestPtr, VolatileDest, IgnoreResult) 48349d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump .Visit(const_cast<Expr*>(E)); 484ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 4857482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4867482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) { 4877482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4887482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4897482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar EmitMemSetToZero(DestPtr, Ty); 4907482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 4917482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4927482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 49327fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump llvm::Value *SrcPtr, QualType Ty, 49427fe2e6c97a3782a0639d87b460741e8ba5d076dMike Stump bool isVolatile) { 4957482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4967482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 49783c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 498ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 499ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 500ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 501ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 502ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 50383c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 504ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 505ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 506ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 5077482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 5087482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (DestPtr->getType() != BP) 5097482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 5107482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (SrcPtr->getType() != BP) 5117482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 5127482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5137482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 5147482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 5157482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5167482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 5177482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *IntPtr = llvm::IntegerType::get(LLVMPointerWidth); 5187482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 519fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 520fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 521fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 522fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 523fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 524fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 525fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 526fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 527fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 528fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 52949d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // we need to use a differnt call here. We use isVolatile to indicate when 53049d1cd5a09ed3df353371fd7f206674a85e0fb45Mike Stump // either the source or the destination is volatile. 531ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner Builder.CreateCall4(CGM.getMemCpyFn(), 5327482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr, SrcPtr, 5337482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // TypeInfo.first describes size in bits. 5347482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 5357482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(llvm::Type::Int32Ty, 5367482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar TypeInfo.second/8)); 5377482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 538