CGExprAgg.cpp revision 9ccb103c6f777fc42343b23b19a8c2c9a740e6e8
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; 379c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnerpublic: 389c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool volatileDest) 39bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner : CGF(cgf), Builder(CGF.Builder), 40bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner DestPtr(destPtr), VolatileDest(volatileDest) { 419c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 429c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 43ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 44ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Utilities 45ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 46ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 479c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// EmitAggLoadOfLValue - Given an expression with aggregate type that 489c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// represents a value lvalue, this method emits the address of the lvalue, 499c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner /// then loads the result into DestPtr. 509c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void EmitAggLoadOfLValue(const Expr *E); 51922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 524ac20ddc7ab324a59862657f756bdd060076b137Mike Stump /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 534ac20ddc7ab324a59862657f756bdd060076b137Mike Stump void EmitFinalDestCopy(const Expr *E, LValue Src); 544ac20ddc7ab324a59862657f756bdd060076b137Mike Stump void EmitFinalDestCopy(const Expr *E, RValue Src); 554ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 56ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 57ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 58ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 59ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 609c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 61488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 629c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 639c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 6412444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 659c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 669c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 679b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 689b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 699b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 70ad6ebd6efcc30cc54540ed9d92256b410519ec0fSeo Sanghyeon void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 71f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 72f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 73f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 749b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 759b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 769b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 77f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 78f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 79f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 80f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 81f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 82f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 834c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor 849c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 857e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes void VisitCStyleCastExpr(CStyleCastExpr *E); 86e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson void VisitImplicitCastExpr(ImplicitCastExpr *E); 87148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 88b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 899c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 9003d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 9107fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 929c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 938fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 940a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 950a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 960a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 979c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 985daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian void VisitObjCKVCRefExpr(ObjCKVCRefExpr *E); 999c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 1009c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitConditionalOperator(const ConditionalOperator *CO); 101636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 10204421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 10304421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 10404421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 10531ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 1067f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 1077f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 108b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 109f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 110f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitInitializationToLValue(Expr *E, LValue Address); 111f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitNullInitializationToLValue(LValue Address, QualType T); 1129c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 113305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 1149c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1159c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1169c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 117ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 118ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 119ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1209c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 121883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 122883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 123883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1249c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1259c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 1264ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LV); 1274ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1284ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1294ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 1304ac20ddc7ab324a59862657f756bdd060076b137Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src) { 1314ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isAggregate() && "value must be aggregate value!"); 1324ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 133883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // If the result is ignored, don't copy from the value. 1349ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump if (DestPtr == 0) { 1359ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump if (Src.isVolatileQualified()) 1369ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump // If the source is volatile, we must read from it; to do that, we need 1379ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump // some place to put it. 1389ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump DestPtr = CGF.CreateTempAlloca(CGF.ConvertType(E->getType()), "agg.tmp"); 1399ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump else 1409ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump return; 1419ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump } 142883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 1434ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // If the result of the assignment is used, copy the LHS there also. 1444ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 1454ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // from the source as well, as we can't eliminate it if either operand 1464ac20ddc7ab324a59862657f756bdd060076b137Mike Stump // is volatile, unless copy has volatile for both source and destination.. 1474ac20ddc7ab324a59862657f756bdd060076b137Mike Stump CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType()); 1484ac20ddc7ab324a59862657f756bdd060076b137Mike Stump} 1494ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1504ac20ddc7ab324a59862657f756bdd060076b137Mike Stump/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 1514ac20ddc7ab324a59862657f756bdd060076b137Mike Stumpvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src) { 1524ac20ddc7ab324a59862657f756bdd060076b137Mike Stump assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 1534ac20ddc7ab324a59862657f756bdd060076b137Mike Stump 1544ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 1554ac20ddc7ab324a59862657f756bdd060076b137Mike Stump Src.isVolatileQualified())); 156883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 157883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 158ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 159ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 160ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 161ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 1627e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopesvoid AggExprEmitter::VisitCStyleCastExpr(CStyleCastExpr *E) { 1637e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes // GCC union extension 1647e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes if (E->getType()->isUnionType()) { 1657e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 1666ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, 1676ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor *SD->field_begin(CGF.getContext()), 1686ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor true, 0); 1697e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes EmitInitializationToLValue(E->getSubExpr(), FieldLoc); 1707e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes return; 1717e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 1727e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1737e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes Visit(E->getSubExpr()); 1747e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes} 1757e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1769619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitImplicitCastExpr(ImplicitCastExpr *E) { 177ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 1789619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getSubExpr()->getType().getUnqualifiedType(), 1799619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getType().getUnqualifiedType()) && 1809619662a1d42e2008b865d3459c0677e149dad1bChris Lattner "Implicit cast types must be compatible"); 181e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson Visit(E->getSubExpr()); 182e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 183e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 1849619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 185148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson RValue RV = CGF.EmitCallExpr(E); 1864ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 187796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 1889619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 1899619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 1908f2926b73ed635afecd020da787af6a837601a2bDaniel Dunbar RValue RV = CGF.EmitObjCMessageExpr(E); 1914ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 1928fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 193796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 1949c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 1959c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar RValue RV = CGF.EmitObjCPropertyGet(E); 1964ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 1975daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 1985daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 1995daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanianvoid AggExprEmitter::VisitObjCKVCRefExpr(ObjCKVCRefExpr *E) { 2005daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian RValue RV = CGF.EmitObjCPropertyGet(E); 2014ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, RV); 202148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson} 203148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson 2049619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 2059ccb103c6f777fc42343b23b19a8c2c9a740e6e8Mike Stump CGF.EmitAnyExpr(E->getLHS()); 206f1b97f28a53ee09fa2bc38790d964cda3811bdc6Mike Stump CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest); 20707fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 20807fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 209b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 210b2d963f527674275c9109252474948368b6e6161Chris Lattner CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 211b2d963f527674275c9109252474948368b6e6161Chris Lattner} 212b2d963f527674275c9109252474948368b6e6161Chris Lattner 2139c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 214488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(E, "aggregate binary expression"); 215ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 216ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 21703d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 218ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 219ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 220ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 221ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getLHS()->getType().getUnqualifiedType(), 222ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getRHS()->getType().getUnqualifiedType()) 223ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 2249c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 225883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2267f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 2277f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 2287f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 2297f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // FIXME: Volatility? 2307f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar llvm::Value *AggLoc = DestPtr; 2317f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (!AggLoc) 2327f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 2337f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitAggExpr(E->getRHS(), AggLoc, false); 2347f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 2357f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar RValue::getAggregate(AggLoc)); 23643f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian } 23743f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian else if (LHS.isKVCRef()) { 23843f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian // FIXME: Volatility? 23943f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian llvm::Value *AggLoc = DestPtr; 24043f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian if (!AggLoc) 24143f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 24243f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian CGF.EmitAggExpr(E->getRHS(), AggLoc, false); 24343f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 24443f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian RValue::getAggregate(AggLoc)); 2457f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 2467f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 247fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified()); 2484ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LHS); 2497f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 250883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 251883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2529c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 2539615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 2549615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 2559615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 256883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2579c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond()); 258bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner Builder.CreateCondBr(Cond, LHSBlock, RHSBlock); 259883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2609c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(LHSBlock); 261883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 262883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // Handle the GNU extension for missing LHS. 263883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner assert(E->getLHS() && "Must have LHS for aggregate value"); 264883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 265c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getLHS()); 266d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 267883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2689c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(RHSBlock); 269883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 270c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getRHS()); 271d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 272883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2739c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 274883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 275ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 276b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 2770785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 278ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 279ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 2800262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 281ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 2820262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 2830262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 2840262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 2854ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, 0)); 286b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 287b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 288b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 28931ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 2907f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson llvm::Value *V = DestPtr; 2917f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 2927f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson if (!V) { 2937f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson assert(isa<CXXTempVarDecl>(E->getVarDecl()) && 2947f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson "Must have a temp var decl when there's no destination!"); 2957f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 2967f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson V = CGF.CreateTempAlloca(CGF.ConvertType(E->getVarDecl()->getType()), 2977f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson "tmpvar"); 2987f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson } 299b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 3007f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson CGF.EmitCXXConstructExpr(V, E); 3017f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson} 3027f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson 3037f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlssonvoid AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 3047f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson // FIXME: Do something with the temporaries! 3057f6ad153565245026c7569314f65a4d4ff4ac41fAnders Carlsson Visit(E->getSubExpr()); 306b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 307b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 308f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 309f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 3103498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor if (isa<ImplicitValueInitExpr>(E)) { 3114c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor EmitNullInitializationToLValue(LV, E->getType()); 3123498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor } else if (E->getType()->isComplexType()) { 3133498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 314c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else if (CGF.hasAggregateLLVMType(E->getType())) { 315c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitAnyExpr(E, LV.getAddress(), false); 316c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 317c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, E->getType()); 318f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 319f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 320305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 321f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 322f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (!CGF.hasAggregateLLVMType(T)) { 323f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 32482397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 32582397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 326f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 327f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Otherwise, just memset the whole thing to zero. This is legal 328f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // because in LLVM, all default initializers are guaranteed to have a 329f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // bit pattern of all zeros. 3300f59312e7b625fa5821a63db65377d4b3b667e99Eli Friedman // FIXME: That isn't true for member pointers! 331f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 332f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 333f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 334ccf0ed885952a52caa25767c787e0bf29f4688bdEli Friedman CGF.EmitMemSetToZero(LV.getAddress(), T); 335f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 336f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 337305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 338f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 339a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 340a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // FIXME: Disabled while we figure out what to do about 341a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // test/CodeGen/bitfield.c 342a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 343f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // If we can, prefer a copy from a global; this is a lot less code for long 344f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals, and it's easier for the current optimizers to analyze. 345f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // FIXME: Should we really be doing this? Should we try to avoid cases where 346f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // we emit a global with a lot of zeros? Should we try to avoid short 347f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump // globals? 348c9e8f606787b0bc0c3b08e566b87cc1751694168Eli Friedman if (E->isConstantInitializer(CGF.getContext(), 0)) { 349994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, &CGF); 350994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 351994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman new llvm::GlobalVariable(C->getType(), true, 352994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalValue::InternalLinkage, 353994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman C, "", &CGF.CGM.getModule(), 0); 3544ac20ddc7ab324a59862657f756bdd060076b137Mike Stump EmitFinalDestCopy(E, LValue::MakeAddr(GV, 0)); 355994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 356994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 357a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 358a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor if (E->hadArrayRangeDesignator()) { 359a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 360a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor } 361a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 362f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 363f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 364f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::PointerType *APType = 365f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 366f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::ArrayType *AType = 367f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 368f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 369f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 370922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 3719619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 3729619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 3739619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 3749619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (CGF.getContext().getCanonicalType(T1).getUnqualifiedType() == 3759619662a1d42e2008b865d3459c0677e149dad1bChris Lattner CGF.getContext().getCanonicalType(T2).getUnqualifiedType()) { 3769619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 3779619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 3789619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 379922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 380922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 381f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 382c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 3834c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 384f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 385c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner unsigned CVRqualifier = ElementType.getCVRQualifiers(); 3861e692ace08959399794363e77499b73da5494af9Eli Friedman 387f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner for (uint64_t i = 0; i != NumArrayElements; ++i) { 388f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 389f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (i < NumInitElements) 3901e692ace08959399794363e77499b73da5494af9Eli Friedman EmitInitializationToLValue(E->getInit(i), 3911e692ace08959399794363e77499b73da5494af9Eli Friedman LValue::MakeAddr(NextVal, CVRqualifier)); 392f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 3931e692ace08959399794363e77499b73da5494af9Eli Friedman EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, CVRqualifier), 394f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner ElementType); 395f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 396305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 397f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 398f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 399f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 400f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 401f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 402f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 403f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 404f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 405f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 406f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 407f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned CurInitVal = 0; 4080bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4090bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (E->getType()->isUnionType()) { 4100bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 4110bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 4120bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 4130bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 4140bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4150bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 4160bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 4170bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 4186ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4196ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 4200bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 4210bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 4220bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 4230bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4240bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4250bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4260bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 4270bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 4280bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, Field, true, 0); 4290bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4300bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 4310bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 4320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitInitializationToLValue(E->getInit(0), FieldLoc); 4330bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 4340bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Default-initialize to null 4350bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 4360bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4370bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4380bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4390bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 440f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 441f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 442f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 4436ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4446ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 44544b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor Field != FieldEnd; ++Field) { 44644b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor // We're done once we hit the flexible array member 44744b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor if (Field->getType()->isIncompleteArrayType()) 44844b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 44944b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 45034e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor if (Field->isUnnamedBitfield()) 451f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 45234e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 4531e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 4540bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, *Field, false, 0); 455f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (CurInitVal < NumInitElements) { 456f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Store the initializer into the field 457f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc); 458f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 459f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 46044b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 461f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 462145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 463636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 464636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 465ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 466ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 467ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 468ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 469ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// EmitAggExpr - Emit the computation of the specified expression of 470ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// aggregate type. The result is computed into DestPtr. Note that if 471ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// DestPtr is null, the value of the aggregate expression is not needed. 472ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattnervoid CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 473ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner bool VolatileDest) { 474ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 475ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 476ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 477ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner AggExprEmitter(*this, DestPtr, VolatileDest).Visit(const_cast<Expr*>(E)); 478ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 4797482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4807482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) { 4817482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4827482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4837482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar EmitMemSetToZero(DestPtr, Ty); 4847482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 4857482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4867482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 4877482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::Value *SrcPtr, QualType Ty) { 4887482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4897482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 49083c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 491ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 492ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 493ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 494ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 495ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 49683c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 497ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 498ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 499ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 5007482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 5017482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (DestPtr->getType() != BP) 5027482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 5037482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (SrcPtr->getType() != BP) 5047482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 5057482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5067482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 5077482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 5087482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5097482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 5107482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *IntPtr = llvm::IntegerType::get(LLVMPointerWidth); 5117482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 512fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // FIXME: If we have a volatile struct, the optimizer can remove what might 513fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // appear to be `extra' memory ops: 514fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 515fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // volatile struct { int i; } a, b; 516fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 517fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // int main() { 518fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 519fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // a = b; 520fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // } 521fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // 522fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // either, we need to use a differnt call here, or the backend needs to be 523fde6420cb9142f7f4efe5ec69a216295d83bcda4Mike Stump // taught to not do this. 524ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner Builder.CreateCall4(CGM.getMemCpyFn(), 5257482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr, SrcPtr, 5267482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // TypeInfo.first describes size in bits. 5277482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 5287482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(llvm::Type::Int32Ty, 5297482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar TypeInfo.second/8)); 5307482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 531