CGExprAgg.cpp revision 31ccf377f4a676eb6c205b47eef435de616d5e2d
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 52ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 53ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner // Visitor Methods 54ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner //===--------------------------------------------------------------------===// 55ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 569c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitStmt(Stmt *S) { 57488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(S, "aggregate expression"); 589c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner } 599c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 6012444a24419fe88b42a16b46106db3c11ac5cd35Eli Friedman void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 619c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 629c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // l-values. 639b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 649b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 659b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 66ad6ebd6efcc30cc54540ed9d92256b410519ec0fSeo Sanghyeon void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 67f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 68f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 69f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 709b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 719b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon EmitAggLoadOfLValue(E); 729b73b39f6fbf987acbbe6570d557d13f07c7e0f7Seo Sanghyeon } 73f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 74f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 75f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 76f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner void VisitPredefinedExpr(const PredefinedExpr *E) { 77f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner EmitAggLoadOfLValue(E); 78f0a990c2aa0b596a7e3cdd8fa2a5909d591ffe66Chris Lattner } 794c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor 809c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // Operators. 817e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes void VisitCStyleCastExpr(CStyleCastExpr *E); 82e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson void VisitImplicitCastExpr(ImplicitCastExpr *E); 83148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson void VisitCallExpr(const CallExpr *E); 84b2d963f527674275c9109252474948368b6e6161Chris Lattner void VisitStmtExpr(const StmtExpr *E); 859c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitBinaryOperator(const BinaryOperator *BO); 8603d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattner void VisitBinAssign(const BinaryOperator *E); 8707fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman void VisitBinComma(const BinaryOperator *E); 889c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 898fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner void VisitObjCMessageExpr(ObjCMessageExpr *E); 900a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 910a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar EmitAggLoadOfLValue(E); 920a04d77bde7e3a661c2b41b60630d125d09ed6efDaniel Dunbar } 939c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 945daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian void VisitObjCKVCRefExpr(ObjCKVCRefExpr *E); 959c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 969c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner void VisitConditionalOperator(const ConditionalOperator *CO); 97636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel void VisitInitListExpr(InitListExpr *E); 9804421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 9904421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner Visit(DAE->getExpr()); 10004421087832a031c90bd58f128c7c0e741db8dd2Chris Lattner } 10131ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson void VisitCXXConstructExpr(const CXXConstructExpr *E); 102b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman void VisitVAArgExpr(VAArgExpr *E); 103f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 104f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitInitializationToLValue(Expr *E, LValue Address); 105f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner void EmitNullInitializationToLValue(LValue Address, QualType T); 1069c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner // case Expr::ChooseExprClass: 107305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 1089c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner}; 1099c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner} // end anonymous namespace. 1109c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 111ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 112ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Utilities 113ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 1149c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner 115883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 116883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 117883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner/// then loads the result into DestPtr. 1189c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 1199c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LV = CGF.EmitLValue(E); 120883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner assert(LV.isSimple() && "Can't have aggregate bitfield, vector, etc"); 121883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner llvm::Value *SrcPtr = LV.getAddress(); 122883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 123883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // If the result is ignored, don't copy from the value. 124883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner if (DestPtr == 0) 125883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // FIXME: If the source is volatile, we must read from it. 126883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner return; 127883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 1287482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar CGF.EmitAggregateCopy(DestPtr, SrcPtr, E->getType()); 129883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 130883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 131ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 132ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Visitor Methods 133ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 134ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 1357e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopesvoid AggExprEmitter::VisitCStyleCastExpr(CStyleCastExpr *E) { 1367e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes // GCC union extension 1377e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes if (E->getType()->isUnionType()) { 1387e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 1396ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, 1406ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor *SD->field_begin(CGF.getContext()), 1416ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor true, 0); 1427e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes EmitInitializationToLValue(E->getSubExpr(), FieldLoc); 1437e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes return; 1447e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes } 1457e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1467e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes Visit(E->getSubExpr()); 1477e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes} 1487e91627301b05cd8f2324795e19d87a62f444c31Nuno Lopes 1499619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitImplicitCastExpr(ImplicitCastExpr *E) { 150ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 1519619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getSubExpr()->getType().getUnqualifiedType(), 1529619662a1d42e2008b865d3459c0677e149dad1bChris Lattner E->getType().getUnqualifiedType()) && 1539619662a1d42e2008b865d3459c0677e149dad1bChris Lattner "Implicit cast types must be compatible"); 154e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson Visit(E->getSubExpr()); 155e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson} 156e4707ff0bb48add651c6a1ad9acfcb22609462d1Anders Carlsson 1579619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 158148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson RValue RV = CGF.EmitCallExpr(E); 159148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson assert(RV.isAggregate() && "Return value must be aggregate value!"); 160148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson 161148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson // If the result is ignored, don't copy from the value. 162148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson if (DestPtr == 0) 163796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman // FIXME: If the source is volatile, we must read from it. 164796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman return; 165796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 1667482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 167796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman} 1689619662a1d42e2008b865d3459c0677e149dad1bChris Lattner 1699619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 1708f2926b73ed635afecd020da787af6a837601a2bDaniel Dunbar RValue RV = CGF.EmitObjCMessageExpr(E); 1718f2926b73ed635afecd020da787af6a837601a2bDaniel Dunbar assert(RV.isAggregate() && "Return value must be aggregate value!"); 1728fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner 1738fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner // If the result is ignored, don't copy from the value. 1748fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner if (DestPtr == 0) 1758f2926b73ed635afecd020da787af6a837601a2bDaniel Dunbar // FIXME: If the source is volatile, we must read from it. 1768fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner return; 1778fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner 1787482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 1798fdf32822be2238aa7db62d40e75b168b637ab7dChris Lattner} 180796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman 1819c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbarvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 1829c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar RValue RV = CGF.EmitObjCPropertyGet(E); 1839c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar assert(RV.isAggregate() && "Return value must be aggregate value!"); 1845daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 1855daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian // If the result is ignored, don't copy from the value. 1865daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian if (DestPtr == 0) 1875daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian // FIXME: If the source is volatile, we must read from it. 1885daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian return; 1895daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 1905daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 1915daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian} 1925daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian 1935daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanianvoid AggExprEmitter::VisitObjCKVCRefExpr(ObjCKVCRefExpr *E) { 1945daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian RValue RV = CGF.EmitObjCPropertyGet(E); 1955daf570d0ce027e18ed5f9d66e6b2a14a40b720dFariborz Jahanian assert(RV.isAggregate() && "Return value must be aggregate value!"); 1969c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar 1979c3fc703b29a31d40bcf5027dbb4784dd393804eDaniel Dunbar // If the result is ignored, don't copy from the value. 198796ef3d4a32ce8d9e76df0d5bcab07db97883064Nate Begeman if (DestPtr == 0) 199148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson // FIXME: If the source is volatile, we must read from it. 200148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson return; 201148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson 2027482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar CGF.EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType()); 203148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson} 204148fe6772733166c720e28b7bb5084af6e624b44Anders Carlsson 2059619662a1d42e2008b865d3459c0677e149dad1bChris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 20607fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman CGF.EmitAnyExpr(E->getLHS()); 20707fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman CGF.EmitAggExpr(E->getRHS(), DestPtr, false); 20807fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman} 20907fa52ab33a75d7a5736ea5bd0d4e3134fb10c7eEli Friedman 210b2d963f527674275c9109252474948368b6e6161Chris Lattnervoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 211b2d963f527674275c9109252474948368b6e6161Chris Lattner CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 212b2d963f527674275c9109252474948368b6e6161Chris Lattner} 213b2d963f527674275c9109252474948368b6e6161Chris Lattner 2149c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 215488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar CGF.ErrorUnsupported(E, "aggregate binary expression"); 216ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 217ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 21803d6fb99224c36935c9af9f4785cb33453c99b2bChris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 219ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // For an assignment to work, the value on the right has 220ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman // to be compatible with the value on the left. 221ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman assert(CGF.getContext().typesAreCompatible( 222ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getLHS()->getType().getUnqualifiedType(), 223ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman E->getRHS()->getType().getUnqualifiedType()) 224ff6e2b7d31b0f5494f583419e5061c32ea4e6180Eli Friedman && "Invalid assignment"); 2259c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 226883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2277f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // We have to special case property setters, otherwise we must have 2287f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // a simple lvalue (no aggregates inside vectors, bitfields). 2297f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (LHS.isPropertyRef()) { 2307f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // FIXME: Volatility? 2317f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar llvm::Value *AggLoc = DestPtr; 2327f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (!AggLoc) 2337f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 2347f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitAggExpr(E->getRHS(), AggLoc, false); 2357f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 2367f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar RValue::getAggregate(AggLoc)); 23743f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian } 23843f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian else if (LHS.isKVCRef()) { 23943f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian // FIXME: Volatility? 24043f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian llvm::Value *AggLoc = DestPtr; 24143f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian if (!AggLoc) 24243f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian AggLoc = CGF.CreateTempAlloca(CGF.ConvertType(E->getRHS()->getType())); 24343f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian CGF.EmitAggExpr(E->getRHS(), AggLoc, false); 24443f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 24543f447098d5e6162fbfb97ed38365284207a7fbeFariborz Jahanian RValue::getAggregate(AggLoc)); 2467f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } else { 2477f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // Codegen the RHS so that it stores directly into the LHS. 2487f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), false /*FIXME: VOLATILE LHS*/); 2497f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar 2507f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar if (DestPtr == 0) 2517f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar return; 2527f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar 2537f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar // If the result of the assignment is used, copy the RHS there also. 2547482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar CGF.EmitAggregateCopy(DestPtr, LHS.getAddress(), E->getType()); 2557f8ea5c5b3a6a4332a841eefdd86b0726722ea7bDaniel Dunbar } 256883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 257883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2589c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattnervoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 2599615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 2609615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 2619615ecb44f549ae9fa2b4db6ff46bc78befbf62cDaniel Dunbar llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 262883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2639c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner llvm::Value *Cond = CGF.EvaluateExprAsBool(E->getCond()); 264bfc0c1ae4b505b52b36f572a9641f99e76879cabChris Lattner Builder.CreateCondBr(Cond, LHSBlock, RHSBlock); 265883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2669c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(LHSBlock); 267883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 268883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner // Handle the GNU extension for missing LHS. 269883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner assert(E->getLHS() && "Must have LHS for aggregate value"); 270883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 271c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getLHS()); 272d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 273883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2749c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(RHSBlock); 275883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 276c748f27f4055f5732a3c231f31dc7325c5279020Chris Lattner Visit(E->getRHS()); 277d57a871339c7c98d58d93108b806f59bdf4e13e2Daniel Dunbar CGF.EmitBranch(ContBlock); 278883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner 2799c03356918aee078e925c35f9854dfdf2492dfc3Chris Lattner CGF.EmitBlock(ContBlock); 280883f6a7cc7dccb1d675e27121a82614d63492a8dChris Lattner} 281ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 282b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedmanvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 2830785570af3ef5f8c5a0377129e41efe6f3f8d770Daniel Dunbar llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 284ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 285ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson 2860262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl if (!ArgPtr) { 287ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 2880262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl return; 2890262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl } 2900262f02cbaa35cafb61b1b994e0adff7c422a235Sebastian Redl 291b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman if (DestPtr) 2921e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 293ddf7cac45d85b73127adbbd91a2b28fc7291c57eAnders Carlsson CGF.EmitAggregateCopy(DestPtr, ArgPtr, VE->getType()); 294b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman} 295b1851249d787f573b9e1312fff8ca4bbcf351f10Eli Friedman 296b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlssonvoid 29731ccf377f4a676eb6c205b47eef435de616d5e2dAnders CarlssonAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 29831ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson assert(DestPtr && "Must have a dest to emit into!"); 299b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 30031ccf377f4a676eb6c205b47eef435de616d5e2dAnders Carlsson CGF.EmitCXXConstructExpr(DestPtr, E); 301b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson} 302b14095aa98c6fedd3625920c4ce834bcaf24d9f7Anders Carlsson 303f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV) { 304f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // FIXME: Are initializers affected by volatile? 3053498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor if (isa<ImplicitValueInitExpr>(E)) { 3064c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor EmitNullInitializationToLValue(LV, E->getType()); 3073498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor } else if (E->getType()->isComplexType()) { 3083498bdb9e9cb300de74c7b51c92608e2902b2348Douglas Gregor CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 309c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else if (CGF.hasAggregateLLVMType(E->getType())) { 310c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitAnyExpr(E, LV.getAddress(), false); 311c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman } else { 312c8ba9614ca5469c3ae259e3ec09792f4b8969397Eli Friedman CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, E->getType()); 313f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 314f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 315305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 316f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 317f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (!CGF.hasAggregateLLVMType(T)) { 318f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // For non-aggregates, we can store zero 31982397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 32082397139c47a41675ab337290f6dca7644e541d5Daniel Dunbar CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 321f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 322f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Otherwise, just memset the whole thing to zero. This is legal 323f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // because in LLVM, all default initializers are guaranteed to have a 324f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // bit pattern of all zeros. 3250f59312e7b625fa5821a63db65377d4b3b667e99Eli Friedman // FIXME: That isn't true for member pointers! 326f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // There's a potential optimization opportunity in combining 327f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // memsets; that would be easy for arrays, but relatively 328f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // difficult for structures with the current code. 329ccf0ed885952a52caa25767c787e0bf29f4688bdEli Friedman CGF.EmitMemSetToZero(LV.getAddress(), T); 330f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 331f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner} 332305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio 333f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattnervoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 334a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#if 0 335a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // FIXME: Disabled while we figure out what to do about 336a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // test/CodeGen/bitfield.c 337a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman // 338994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // If we can, prefer a copy from a global; this is a lot less 339994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // code for long globals, and it's easier for the current optimizers 340994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // to analyze. 341994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // FIXME: Should we really be doing this? Should we try to avoid 342994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // cases where we emit a global with a lot of zeros? Should 343994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman // we try to avoid short globals? 344c9e8f606787b0bc0c3b08e566b87cc1751694168Eli Friedman if (E->isConstantInitializer(CGF.getContext(), 0)) { 345994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, &CGF); 346994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalVariable* GV = 347994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman new llvm::GlobalVariable(C->getType(), true, 348994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman llvm::GlobalValue::InternalLinkage, 349994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman C, "", &CGF.CGM.getModule(), 0); 350994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman CGF.EmitAggregateCopy(DestPtr, GV, E->getType()); 351994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman return; 352994ffef4353056363ba5915eeecf0e1b0678f286Eli Friedman } 353a385b3c9c442831fc6a9ec6e8823b2067bd65710Eli Friedman#endif 354a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor if (E->hadArrayRangeDesignator()) { 355a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor CGF.ErrorUnsupported(E, "GNU array range designator extension"); 356a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor } 357a9c878086036de36482cc21e35a33cabe9699b0aDouglas Gregor 358f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Handle initialization of an array. 359f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (E->getType()->isArrayType()) { 360f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::PointerType *APType = 361f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::PointerType>(DestPtr->getType()); 362f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner const llvm::ArrayType *AType = 363f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner cast<llvm::ArrayType>(APType->getElementType()); 364f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 365f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumInitElements = E->getNumInits(); 366922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 3679619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (E->getNumInits() > 0) { 3689619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T1 = E->getType(); 3699619662a1d42e2008b865d3459c0677e149dad1bChris Lattner QualType T2 = E->getInit(0)->getType(); 3709619662a1d42e2008b865d3459c0677e149dad1bChris Lattner if (CGF.getContext().getCanonicalType(T1).getUnqualifiedType() == 3719619662a1d42e2008b865d3459c0677e149dad1bChris Lattner CGF.getContext().getCanonicalType(T2).getUnqualifiedType()) { 3729619662a1d42e2008b865d3459c0677e149dad1bChris Lattner EmitAggLoadOfLValue(E->getInit(0)); 3739619662a1d42e2008b865d3459c0677e149dad1bChris Lattner return; 3749619662a1d42e2008b865d3459c0677e149dad1bChris Lattner } 375922696f03ec9637449e2cba260493808b4977cd3Eli Friedman } 376922696f03ec9637449e2cba260493808b4977cd3Eli Friedman 377f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner uint64_t NumArrayElements = AType->getNumElements(); 378c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 3794c67834407ca6ab344dcf44fc599ad4938cfa96dDouglas Gregor ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 380f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 381c63a1f276f7b324fd9a4be82098b1c8f7bf30733Chris Lattner unsigned CVRqualifier = ElementType.getCVRQualifiers(); 3821e692ace08959399794363e77499b73da5494af9Eli Friedman 383f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner for (uint64_t i = 0; i != NumArrayElements; ++i) { 384f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 385f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (i < NumInitElements) 3861e692ace08959399794363e77499b73da5494af9Eli Friedman EmitInitializationToLValue(E->getInit(i), 3871e692ace08959399794363e77499b73da5494af9Eli Friedman LValue::MakeAddr(NextVal, CVRqualifier)); 388f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner else 3891e692ace08959399794363e77499b73da5494af9Eli Friedman EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, CVRqualifier), 390f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner ElementType); 391f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 392305762c08975cd6e0bebd684ca910fa208792483Lauro Ramos Venancio return; 393f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 394f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 395f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 396f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 397f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Do struct initialization; this code just sets each individual member 398f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // to the approprate value. This makes bitfield support automatic; 399f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the disadvantage is that the generated code is more difficult for 400f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // the optimizer, especially with bitfields. 401f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned NumInitElements = E->getNumInits(); 402f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner RecordDecl *SD = E->getType()->getAsRecordType()->getDecl(); 403f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner unsigned CurInitVal = 0; 4040bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4050bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (E->getType()->isUnionType()) { 4060bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Only initialize one field of a union. The field itself is 4070bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // specified by the initializer list. 4080bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (!E->getInitializedFieldInUnion()) { 4090bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Empty union; we have nothing to do. 4100bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4110bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#ifndef NDEBUG 4120bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Make sure that it's really an empty and not a failure of 4130bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // semantic analysis. 4146ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4156ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 4160bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor Field != FieldEnd; ++Field) 4170bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 4180bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor#endif 4190bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4200bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4210bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4220bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // FIXME: volatility 4230bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor FieldDecl *Field = E->getInitializedFieldInUnion(); 4240bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, Field, true, 0); 4250bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4260bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor if (NumInitElements) { 4270bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Store the initializer into the field 4280bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitInitializationToLValue(E->getInit(0), FieldLoc); 4290bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } else { 4300bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor // Default-initialize to null 4310bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 4320bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 4330bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor 4340bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor return; 4350bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor } 436f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner 437f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Here we iterate over the fields; this makes it simpler to both 438f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // default-initialize fields and skip over unnamed fields. 4396ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor for (RecordDecl::field_iterator Field = SD->field_begin(CGF.getContext()), 4406ab3524f72a6e64aa04973fa9433b5559abb3525Douglas Gregor FieldEnd = SD->field_end(CGF.getContext()); 44144b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor Field != FieldEnd; ++Field) { 44244b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor // We're done once we hit the flexible array member 44344b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor if (Field->getType()->isIncompleteArrayType()) 44444b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor break; 44544b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor 44634e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor if (Field->isUnnamedBitfield()) 447f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner continue; 44834e7946831a63f96d3ba3478c74ca8e25ee52d7eDouglas Gregor 4491e692ace08959399794363e77499b73da5494af9Eli Friedman // FIXME: volatility 4500bb76897bedb8b747efc6523efb432fc24966118Douglas Gregor LValue FieldLoc = CGF.EmitLValueForField(DestPtr, *Field, false, 0); 451f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner if (CurInitVal < NumInitElements) { 452f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // Store the initializer into the field 453f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc); 454f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } else { 455f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner // We're out of initalizers; default-initialize to null 45644b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor EmitNullInitializationToLValue(FieldLoc, Field->getType()); 457f81557cb719dd0d1ce3713f050fb76b0a0cb729aChris Lattner } 458145cd89f9233d375381aa13bd28b2d36f83e6181Lauro Ramos Venancio } 459636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel} 460636c3d04673da8c8605d7e45640a2ff7aec648f1Devang Patel 461ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 462ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner// Entry Points into this File 463ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner//===----------------------------------------------------------------------===// 464ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 465ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// EmitAggExpr - Emit the computation of the specified expression of 466ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// aggregate type. The result is computed into DestPtr. Note that if 467ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner/// DestPtr is null, the value of the aggregate expression is not needed. 468ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattnervoid CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 469ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner bool VolatileDest) { 470ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner assert(E && hasAggregateLLVMType(E->getType()) && 471ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner "Invalid aggregate expression to emit"); 472ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner 473ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner AggExprEmitter(*this, DestPtr, VolatileDest).Visit(const_cast<Expr*>(E)); 474ee755f9118c4061b21e0a787d4a20484df36f603Chris Lattner} 4757482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4767482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) { 4777482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4787482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4797482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar EmitMemSetToZero(DestPtr, Ty); 4807482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 4817482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 4827482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbarvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 4837482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::Value *SrcPtr, QualType Ty) { 4847482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 4857482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 48683c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // Aggregate assignment turns into llvm.memcpy. This is almost valid per 487ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // C99 6.5.16.1p3, which states "If the value being stored in an object is 488ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // read from another object that overlaps in anyway the storage of the first 489ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // object, then the overlap shall be exact and the two objects shall have 490ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // qualified or unqualified versions of a compatible type." 491ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // 49283c9629291e3f4d4619fa98f8a57e4ec347c6154Chris Lattner // memcpy is not defined if the source and destination pointers are exactly 493ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // equal, but other compilers do this optimization, and almost every memcpy 494ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // implementation handles this case safely. If there is a libc that does not 495ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner // safely handle this, we can add a target hook. 4967482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *BP = llvm::PointerType::getUnqual(llvm::Type::Int8Ty); 4977482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (DestPtr->getType() != BP) 4987482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 4997482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar if (SrcPtr->getType() != BP) 5007482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 5017482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5027482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // Get size and alignment info for this aggregate. 5037482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 5047482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 5057482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // FIXME: Handle variable sized types. 5067482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar const llvm::Type *IntPtr = llvm::IntegerType::get(LLVMPointerWidth); 5077482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar 508ca4fc2c2620e184e8b96845a87b19d54f9e045c1Chris Lattner Builder.CreateCall4(CGM.getMemCpyFn(), 5097482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar DestPtr, SrcPtr, 5107482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar // TypeInfo.first describes size in bits. 5117482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 5127482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar llvm::ConstantInt::get(llvm::Type::Int32Ty, 5137482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar TypeInfo.second/8)); 5147482d12c345c6391f8956850545e2d4aa7701ce6Daniel Dunbar} 515