CGExprAgg.cpp revision 2d6b0e94db30c0e2754d270753c6f75478e451bf
12240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// 2fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 92240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner// 107152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner// This contains code to emit Aggregate Expr nodes as LLVM code. 117152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner// 127152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner//===----------------------------------------------------------------------===// 137152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 142240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner#include "CodeGenFunction.h" 157152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner#include "CodeGenModule.h" 167152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner#include "CGObjCRuntime.h" 177152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner#include "clang/AST/ASTContext.h" 18543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner#include "clang/AST/DeclCXX.h" 19543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner#include "clang/AST/StmtVisitor.h" 20543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner#include "llvm/Constants.h" 21543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner#include "llvm/Function.h" 22d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner#include "llvm/GlobalVariable.h" 23d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner#include "llvm/Intrinsics.h" 24d64152a70842b2f4186aa912938e69ca09c1434cChris Lattnerusing namespace clang; 25d64152a70842b2f4186aa912938e69ca09c1434cChris Lattnerusing namespace CodeGen; 26d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 27d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner//===----------------------------------------------------------------------===// 280cade261322242132905914f613d25d16e1a9ff6Nick Lewycky// Aggregate Expression Emitter 297f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner//===----------------------------------------------------------------------===// 307f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner 312240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattnernamespace { 327152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnerclass AggExprEmitter : public StmtVisitor<AggExprEmitter> { 337152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CodeGenFunction &CGF; 347152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGBuilderTy &Builder; 357152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner llvm::Value *DestPtr; 367152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner bool VolatileDest; 377152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner bool IgnoreResult; 387152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner bool IsInitializer; 392240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner bool RequiresGCollection; 407152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 417152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner ReturnValueSlot getReturnValueSlot() const { 42d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner return ReturnValueSlot(DestPtr, VolatileDest); 437152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner } 447152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnerpublic: 457152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool v, 467152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner bool ignore, bool isinit, bool requiresGCollection) 477152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner : CGF(cgf), Builder(CGF.Builder), 487f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner DestPtr(destPtr), VolatileDest(v), IgnoreResult(ignore), 497f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner IsInitializer(isinit), RequiresGCollection(requiresGCollection) { 502240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner } 512240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 522240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner //===--------------------------------------------------------------------===// 530e5f499638c8d277b9dc4a4385712177c53b5681Chris Lattner // Utilities 543fc6ef1bb96d9a3194cef667a2d3cbc94e3fb189Chris Lattner //===--------------------------------------------------------------------===// 556a35b40250735a50efe66c88414cdd3b79185019Chris Lattner 56ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner /// EmitAggLoadOfLValue - Given an expression with aggregate type that 572240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner /// represents a value lvalue, this method emits the address of the lvalue, 582240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner /// then loads the result into DestPtr. 592240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void EmitAggLoadOfLValue(const Expr *E); 602240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 610cade261322242132905914f613d25d16e1a9ff6Nick Lewycky /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 62543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 63551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 64f8485c643412dbff46fe87ea2867445169a5c28eChris Lattner 65d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke //===--------------------------------------------------------------------===// 660e5f499638c8d277b9dc4a4385712177c53b5681Chris Lattner // Visitor Methods 670e5f499638c8d277b9dc4a4385712177c53b5681Chris Lattner //===--------------------------------------------------------------------===// 682240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 690e5f499638c8d277b9dc4a4385712177c53b5681Chris Lattner void VisitStmt(Stmt *S) { 703e8b6631e67e01e4960a7ba4668a50c596607473Chris Lattner CGF.ErrorUnsupported(S, "aggregate expression"); 71ecd94c804a563f2a86572dcf1d2e81f397e19daaNick Lewycky } 72ae73dc1448d25b02cabc7c64c86c64371453dda8Dan Gohman void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 73794fd75c67a2cdc128d67342c6d88a504d186896Devang Patel void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 742240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 757152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // l-values. 767152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 777152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 78ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 790cade261322242132905914f613d25d16e1a9ff6Nick Lewycky void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 80ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 817152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner EmitAggLoadOfLValue(E); 82543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 832240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 842240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner EmitAggLoadOfLValue(E); 852240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner } 86844731a7f1909f55935e3514c9e713a62d67662eDan Gohman void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 87844731a7f1909f55935e3514c9e713a62d67662eDan Gohman EmitAggLoadOfLValue(E); 88844731a7f1909f55935e3514c9e713a62d67662eDan Gohman } 89d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke void VisitPredefinedExpr(const PredefinedExpr *E) { 90f8485c643412dbff46fe87ea2867445169a5c28eChris Lattner EmitAggLoadOfLValue(E); 91f8485c643412dbff46fe87ea2867445169a5c28eChris Lattner } 92f8485c643412dbff46fe87ea2867445169a5c28eChris Lattner 933fc6ef1bb96d9a3194cef667a2d3cbc94e3fb189Chris Lattner // Operators. 94cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitCastExpr(CastExpr *E); 95cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitCallExpr(const CallExpr *E); 96cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitStmtExpr(const StmtExpr *E); 97cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitBinaryOperator(const BinaryOperator *BO); 98cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 99cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitBinAssign(const BinaryOperator *E); 100cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitBinComma(const BinaryOperator *E); 101cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitUnaryAddrOf(const UnaryOperator *E); 102cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky 1030cade261322242132905914f613d25d16e1a9ff6Nick Lewycky void VisitObjCMessageExpr(ObjCMessageExpr *E); 1047f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 1057f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner EmitAggLoadOfLValue(E); 106ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner } 107ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 108ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitObjCImplicitSetterGetterRefExpr(ObjCImplicitSetterGetterRefExpr *E); 1097f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner 110ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitConditionalOperator(const ConditionalOperator *CO); 111cb19438f63019eb557c1fbaeae8a6de78b03c584Nick Lewycky void VisitChooseExpr(const ChooseExpr *CE); 112ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitInitListExpr(InitListExpr *E); 113ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 114ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 115ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner Visit(DAE->getExpr()); 116ecb7a77885b174cf4d001a9b48533b3979e7810dDan Gohman } 117ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 118ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCXXConstructExpr(const CXXConstructExpr *E); 119ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 120ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner void VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E); 1217f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 1227f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner 1232240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void VisitVAArgExpr(VAArgExpr *E); 1242240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 1252240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void EmitInitializationToLValue(Expr *E, LValue Address, QualType T); 1262240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void EmitNullInitializationToLValue(LValue Address, QualType T); 1272240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner // case Expr::ChooseExprClass: 1282240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 129ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner}; 1300cade261322242132905914f613d25d16e1a9ff6Nick Lewycky} // end anonymous namespace. 1312240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 1322240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner//===----------------------------------------------------------------------===// 1337f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner// Utilities 1347f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner//===----------------------------------------------------------------------===// 135ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner 136ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner/// EmitAggLoadOfLValue - Given an expression with aggregate type that 137ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner/// represents a value lvalue, this method emits the address of the lvalue, 138ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner/// then loads the result into DestPtr. 139ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattnervoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 140ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner LValue LV = CGF.EmitLValue(E); 1417f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner EmitFinalDestCopy(E, LV); 1427f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner} 1437f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner 144ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 145ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattnervoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 14600b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen assert(Src.isAggregate() && "value must be aggregate value!"); 1474c0e4cdc40bbf94766242294fe386f4eb2d32d2eChris Lattner 148ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner // If the result is ignored, don't copy from the value. 1497f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner if (DestPtr == 0) { 15032b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner if (!Src.isVolatileQualified() || (IgnoreResult && Ignore)) 15132b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner return; 15232b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner // If the source is volatile, we must read from it; to do that, we need 15332b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner // some place to put it. 15432b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner DestPtr = CGF.CreateMemTemp(E->getType(), "agg.tmp"); 15532b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner } 15632b1e87f111d79f3f5b0e86c8f138c02bef8aa18Chris Lattner 157fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman if (RequiresGCollection) { 158ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 159ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner DestPtr, Src.getAggregateAddr(), 160ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner E->getType()); 161ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner return; 162ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner } 163ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner // If the result of the assignment is used, copy the LHS there also. 164cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 165cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner // from the source as well, as we can't eliminate it if either operand 166cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner // is volatile, unless copy has volatile for both source and destination.. 167cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType(), 168cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner VolatileDest|Src.isVolatileQualified()); 169cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner} 170cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner 171cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 172cf2f89251d45bc9783917874adb9029f71d50068Chris Lattnervoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 173cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 174ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner 175ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 176ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner Src.isVolatileQualified()), 177cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner Ignore); 178cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner} 179cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner 180cf2f89251d45bc9783917874adb9029f71d50068Chris Lattner//===----------------------------------------------------------------------===// 1817f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner// Visitor Methods 1827f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner//===----------------------------------------------------------------------===// 1837f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner 1847f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattnervoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 1857f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner if (!DestPtr && E->getCastKind() != CastExpr::CK_Dynamic) { 1867f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner Visit(E->getSubExpr()); 187c5dc660ea0b153904de601eadd40fa4962c8c71cChris Lattner return; 1887f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner } 189c5dc660ea0b153904de601eadd40fa4962c8c71cChris Lattner 190c5dc660ea0b153904de601eadd40fa4962c8c71cChris Lattner switch (E->getCastKind()) { 1917f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner default: assert(0 && "Unhandled cast kind!"); 1922240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner 1932240d2b3f7b9f5835868c83ce78d125d1b65212bChris Lattner case CastExpr::CK_Dynamic: { 1947152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 1957152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 196543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // FIXME: Do we also need to handle property references here? 197543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (LV.isSimple()) 198543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 199543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner else 2007152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 2017152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 2027152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner if (DestPtr) 2036a35b40250735a50efe66c88414cdd3b79185019Chris Lattner CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 2047152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner break; 2056a35b40250735a50efe66c88414cdd3b79185019Chris Lattner } 2060cade261322242132905914f613d25d16e1a9ff6Nick Lewycky 2076a35b40250735a50efe66c88414cdd3b79185019Chris Lattner case CastExpr::CK_ToUnion: { 2086a35b40250735a50efe66c88414cdd3b79185019Chris Lattner // GCC union extension 2096a35b40250735a50efe66c88414cdd3b79185019Chris Lattner QualType PtrTy = 2106a35b40250735a50efe66c88414cdd3b79185019Chris Lattner CGF.getContext().getPointerType(E->getSubExpr()->getType()); 2116a35b40250735a50efe66c88414cdd3b79185019Chris Lattner llvm::Value *CastPtr = Builder.CreateBitCast(DestPtr, 2126a35b40250735a50efe66c88414cdd3b79185019Chris Lattner CGF.ConvertType(PtrTy)); 2136a35b40250735a50efe66c88414cdd3b79185019Chris Lattner EmitInitializationToLValue(E->getSubExpr(), 2146a35b40250735a50efe66c88414cdd3b79185019Chris Lattner LValue::MakeAddr(CastPtr, Qualifiers()), 2156a35b40250735a50efe66c88414cdd3b79185019Chris Lattner E->getSubExpr()->getType()); 2166a35b40250735a50efe66c88414cdd3b79185019Chris Lattner break; 2176a35b40250735a50efe66c88414cdd3b79185019Chris Lattner } 2187152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 2197152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner case CastExpr::CK_DerivedToBase: 2207152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner case CastExpr::CK_BaseToDerived: 2217152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner case CastExpr::CK_UncheckedDerivedToBase: { 2227152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " 2237152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner "should have been unpacked before we got here"); 2247152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner break; 2257152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner } 2267152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 2277152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // FIXME: Remove the CK_Unknown check here. 2287152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner case CastExpr::CK_Unknown: 2297152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner case CastExpr::CK_NoOp: 230d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_UserDefinedConversion: 231d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_ConstructorConversion: 232d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 233d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner E->getType()) && 234d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner "Implicit cast types must be compatible"); 235d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Visit(E->getSubExpr()); 236d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner break; 237d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 238d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_NullToMemberPointer: { 239d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner // If the subexpression's type is the C++0x nullptr_t, emit the 240d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner // subexpression, which may have side effects. 241d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner if (E->getSubExpr()->getType()->isNullPtrType()) 242d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Visit(E->getSubExpr()); 243d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 244d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner const llvm::Type *PtrDiffTy = 245d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner CGF.ConvertType(CGF.getContext().getPointerDiffType()); 246e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner 247d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *NullValue = llvm::Constant::getNullValue(PtrDiffTy); 248fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman llvm::Value *Ptr = Builder.CreateStructGEP(DestPtr, 0, "ptr"); 249d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Builder.CreateStore(NullValue, Ptr, VolatileDest); 250d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 251d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *Adj = Builder.CreateStructGEP(DestPtr, 1, "adj"); 252d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Builder.CreateStore(NullValue, Adj, VolatileDest); 253d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 254d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner break; 255d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner } 256d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 257d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_BitCast: { 258d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner // This must be a member function pointer cast. 259d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Visit(E->getSubExpr()); 260d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner break; 261d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner } 262d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 263d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_DerivedToBaseMemberPointer: 264d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner case CastExpr::CK_BaseToDerivedMemberPointer: { 265d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner QualType SrcType = E->getSubExpr()->getType(); 266d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 267d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *Src = CGF.CreateMemTemp(SrcType, "tmp"); 268d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner CGF.EmitAggExpr(E->getSubExpr(), Src, SrcType.isVolatileQualified()); 269d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 270d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *SrcPtr = Builder.CreateStructGEP(Src, 0, "src.ptr"); 271d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner SrcPtr = Builder.CreateLoad(SrcPtr); 272d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 273d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *SrcAdj = Builder.CreateStructGEP(Src, 1, "src.adj"); 274d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner SrcAdj = Builder.CreateLoad(SrcAdj); 275d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 276d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 277d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner Builder.CreateStore(SrcPtr, DstPtr, VolatileDest); 278d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 279d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner llvm::Value *DstAdj = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 280d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner 281d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner // Now See if we need to update the adjustment. 282d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner const CXXRecordDecl *BaseDecl = 283d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner cast<CXXRecordDecl>(SrcType->getAs<MemberPointerType>()-> 284d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner getClass()->getAs<RecordType>()->getDecl()); 2857152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner const CXXRecordDecl *DerivedDecl = 286543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()-> 287543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner getClass()->getAs<RecordType>()->getDecl()); 288543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 289543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner std::swap(DerivedDecl, BaseDecl); 290543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 291543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (llvm::Constant *Adj = 292543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.CGM.GetNonVirtualBaseClassOffset(DerivedDecl, E->getBasePath())) { 293543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 294543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner SrcAdj = Builder.CreateSub(SrcAdj, Adj, "adj"); 295543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner else 296543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner SrcAdj = Builder.CreateAdd(SrcAdj, Adj, "adj"); 29707e6e56f57e8781a8d7bc601cc9034a3741d84c2Anton Korobeynikov } 29807e6e56f57e8781a8d7bc601cc9034a3741d84c2Anton Korobeynikov 299543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner Builder.CreateStore(SrcAdj, DstAdj, VolatileDest); 300543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner break; 301543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 302543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 303543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner} 304543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 305543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattnervoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 306543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (E->getCallReturnType()->isReferenceType()) { 307543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner EmitAggLoadOfLValue(E); 308d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner return; 309543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 310543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 3117152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // If the struct doesn't require GC, we can just pass the destination 312ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner // directly to EmitCall. 3130cade261322242132905914f613d25d16e1a9ff6Nick Lewycky if (!RequiresGCollection) { 314ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner CGF.EmitCallExpr(E, getReturnValueSlot()); 3157152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner return; 3167152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner } 3177152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3187152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner RValue RV = CGF.EmitCallExpr(E); 3197152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner EmitFinalDestCopy(E, RV); 3208d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner} 3218d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner 3228d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattnervoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 3238d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 3248d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner} 3258d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner 3268d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattnervoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 3278d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner CGF.EmitObjCPropertyGet(E, getReturnValueSlot()); 3288d9455d4e4f63c368f17b74a36b472fc61685310Chris Lattner} 3297152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3307152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnervoid AggExprEmitter::VisitObjCImplicitSetterGetterRefExpr( 3317152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner ObjCImplicitSetterGetterRefExpr *E) { 3327152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.EmitObjCPropertyGet(E, getReturnValueSlot()); 3337152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner} 3347152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3357152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnervoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 3367152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.EmitAnyExpr(E->getLHS(), 0, false, true); 3377152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest, 3387152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner /*IgnoreResult=*/false, IsInitializer); 3397152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner} 3407152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3417152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnervoid AggExprEmitter::VisitUnaryAddrOf(const UnaryOperator *E) { 3427152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // We have a member function pointer. 3437152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>(); 344ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner (void) MPT; 345ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner assert(MPT->getPointeeType()->isFunctionProtoType() && 346ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner "Unexpected member pointer type!"); 347ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner 348ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner // The creation of member function pointers has no side effects; if 349543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // there is no destination pointer, we have nothing to do. 350543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (!DestPtr) 351543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner return; 352543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 353543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner const DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr()); 354543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner const CXXMethodDecl *MD = 355543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner cast<CXXMethodDecl>(DRE->getDecl())->getCanonicalDecl(); 356543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 3577152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner const llvm::Type *PtrDiffTy = 3587152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.ConvertType(CGF.getContext().getPointerDiffType()); 3597152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3607152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3617152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 362543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner llvm::Value *FuncPtr; 363543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 364543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (MD->isVirtual()) { 365543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner int64_t Index = CGF.CGM.getVTables().getMethodVTableIndex(MD); 366543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 367543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // FIXME: We shouldn't use / 8 here. 368543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner uint64_t PointerWidthInBytes = 369543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.CGM.getContext().Target.getPointerWidth(0) / 8; 370543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 371543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // Itanium C++ ABI 2.3: 372543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // For a non-virtual function, this field is a simple function pointer. 373543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // For a virtual function, it is 1 plus the virtual table offset 374543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // (in bytes) of the function, represented as a ptrdiff_t. 375543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner FuncPtr = llvm::ConstantInt::get(PtrDiffTy, 3767152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner (Index * PointerWidthInBytes) + 1); 3777152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner } else { 378d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); 379d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner const llvm::Type *Ty = 380d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner CGF.CGM.getTypes().GetFunctionType(CGF.CGM.getTypes().getFunctionInfo(MD), 381826c49132a9cba1e08a5fce78d05561d9a3746ceDevang Patel FPT->isVariadic()); 3823b5f45042b17ad52815e3dd6c0c1df99f196dd04Chris Lattner llvm::Constant *Fn = CGF.CGM.GetAddrOfFunction(MD, Ty); 383d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner FuncPtr = llvm::ConstantExpr::getPtrToInt(Fn, PtrDiffTy); 384d64152a70842b2f4186aa912938e69ca09c1434cChris Lattner } 3857152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner Builder.CreateStore(FuncPtr, DstPtr, VolatileDest); 3867152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3877152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner llvm::Value *AdjPtr = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 3887152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 3897152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // The adjustment will always be 0. 3907152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner Builder.CreateStore(llvm::ConstantInt::get(PtrDiffTy, 0), AdjPtr, 3911d0be15f89cb5056e20e2d24faa8d6afb1573bcaOwen Anderson VolatileDest); 3926934a04a8c15e9971cd1ea4d5c8df2d7afdd5be5Chris Lattner} 3936934a04a8c15e9971cd1ea4d5c8df2d7afdd5be5Chris Lattner 394051a950000e21935165db56695e35bade668193bGabor Greifvoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 395fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 396ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner} 397ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner 398ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattnervoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 399ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner if (E->getOpcode() == BinaryOperator::PtrMemD || 400ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner E->getOpcode() == BinaryOperator::PtrMemI) 401ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner VisitPointerToDataMemberBinaryOperator(E); 402ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner else 403ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner CGF.ErrorUnsupported(E, "aggregate binary expression"); 404ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner} 4054bc5f8071a28b6fc4f4c2207dd03a5f747d0d84bChris Lattner 406ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattnervoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 4077152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner const BinaryOperator *E) { 4087152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 4097152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner EmitFinalDestCopy(E, LV); 4107152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner} 4117152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 4127f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattnervoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 4137f78f218fdb3515a61b995ac64f909bfd8ee84a7Chris Lattner // For an assignment to work, the value on the right has 414b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif // to be compatible with the value on the left. 415b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 4167152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner E->getRHS()->getType()) 4177152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner && "Invalid assignment"); 4187152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner LValue LHS = CGF.EmitLValue(E->getLHS()); 4197152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 4207152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner // We have to special case property setters, otherwise we must have 421fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman // a simple lvalue (no aggregates inside vectors, bitfields). 422ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner if (LHS.isPropertyRef()) { 423ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner llvm::Value *AggLoc = DestPtr; 424ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner if (!AggLoc) 425ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 426ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 427ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 428ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner RValue::getAggregate(AggLoc, VolatileDest)); 429ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner } else if (LHS.isKVCRef()) { 430ce869ee05bfcb9d4750a3d0919a8260a727841c3Chris Lattner llvm::Value *AggLoc = DestPtr; 4317152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner if (!AggLoc) 4327152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 4337152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 4347152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 4357152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner RValue::getAggregate(AggLoc, VolatileDest)); 436fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman } else { 437543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner bool RequiresGCollection = false; 438543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (CGF.getContext().getLangOptions().NeXTRuntime) { 439543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner QualType LHSTy = E->getLHS()->getType(); 440543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (const RecordType *FDTTy = LHSTy.getTypePtr()->getAs<RecordType>()) 441543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner RequiresGCollection = FDTTy->getDecl()->hasObjectMember(); 442543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 443543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // Codegen the RHS so that it stores directly into the LHS. 444543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified(), 445051a950000e21935165db56695e35bade668193bGabor Greif false, false, RequiresGCollection); 446051a950000e21935165db56695e35bade668193bGabor Greif EmitFinalDestCopy(E, LHS, true); 447543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 448543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner} 449543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 450543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattnervoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 451543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner if (!E->getLHS()) { 452543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.ErrorUnsupported(E, "conditional operator with missing LHS"); 453543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner return; 454543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner } 455543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 456543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 457543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 458543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 459543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 460543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 461543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 462543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.BeginConditionalBranch(); 463543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBlock(LHSBlock); 464543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 465543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner // Handle the GNU extension for missing LHS. 466543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner assert(E->getLHS() && "Must have LHS for aggregate value"); 467543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 468543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner Visit(E->getLHS()); 469543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EndConditionalBranch(); 470543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBranch(ContBlock); 471543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 472543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.BeginConditionalBranch(); 473543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBlock(RHSBlock); 474543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 475543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner Visit(E->getRHS()); 476543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EndConditionalBranch(); 477543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBranch(ContBlock); 478543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 479543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner CGF.EmitBlock(ContBlock); 4807152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner} 4817152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner 482051a950000e21935165db56695e35bade668193bGabor Greifvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 4837152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner Visit(CE->getChosenSubExpr(CGF.getContext())); 4847152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner} 485543d622ef7505910c1cdc09ada0ab797c3437590Chris Lattner 4867152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattnervoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 4877152da38ef2c1f9f8ee407dc7740dfd43cbc41a6Chris Lattner llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 488 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 489 490 if (!ArgPtr) { 491 CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 492 return; 493 } 494 495 EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, Qualifiers())); 496} 497 498void AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 499 llvm::Value *Val = DestPtr; 500 501 if (!Val) { 502 // Create a temporary variable. 503 Val = CGF.CreateMemTemp(E->getType(), "tmp"); 504 505 // FIXME: volatile 506 CGF.EmitAggExpr(E->getSubExpr(), Val, false); 507 } else 508 Visit(E->getSubExpr()); 509 510 // Don't make this a live temporary if we're emitting an initializer expr. 511 if (!IsInitializer) 512 CGF.PushCXXTemporary(E->getTemporary(), Val); 513} 514 515void 516AggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 517 llvm::Value *Val = DestPtr; 518 519 if (!Val) { 520 // Create a temporary variable. 521 Val = CGF.CreateMemTemp(E->getType(), "tmp"); 522 } 523 524 if (E->requiresZeroInitialization()) 525 EmitNullInitializationToLValue(LValue::MakeAddr(Val, 526 // FIXME: Qualifiers()? 527 E->getType().getQualifiers()), 528 E->getType()); 529 530 CGF.EmitCXXConstructExpr(Val, E); 531} 532 533void AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 534 llvm::Value *Val = DestPtr; 535 536 CGF.EmitCXXExprWithTemporaries(E, Val, VolatileDest, IsInitializer); 537} 538 539void AggExprEmitter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) { 540 llvm::Value *Val = DestPtr; 541 542 if (!Val) { 543 // Create a temporary variable. 544 Val = CGF.CreateMemTemp(E->getType(), "tmp"); 545 } 546 LValue LV = LValue::MakeAddr(Val, Qualifiers()); 547 EmitNullInitializationToLValue(LV, E->getType()); 548} 549 550void AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 551 llvm::Value *Val = DestPtr; 552 553 if (!Val) { 554 // Create a temporary variable. 555 Val = CGF.CreateMemTemp(E->getType(), "tmp"); 556 } 557 LValue LV = LValue::MakeAddr(Val, Qualifiers()); 558 EmitNullInitializationToLValue(LV, E->getType()); 559} 560 561void 562AggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV, QualType T) { 563 // FIXME: Ignore result? 564 // FIXME: Are initializers affected by volatile? 565 if (isa<ImplicitValueInitExpr>(E)) { 566 EmitNullInitializationToLValue(LV, T); 567 } else if (T->isReferenceType()) { 568 RValue RV = CGF.EmitReferenceBindingToExpr(E, /*IsInitializer=*/false); 569 CGF.EmitStoreThroughLValue(RV, LV, T); 570 } else if (T->isAnyComplexType()) { 571 CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 572 } else if (CGF.hasAggregateLLVMType(T)) { 573 CGF.EmitAnyExpr(E, LV.getAddress(), false); 574 } else { 575 CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, T); 576 } 577} 578 579void AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 580 if (!CGF.hasAggregateLLVMType(T)) { 581 // For non-aggregates, we can store zero 582 llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 583 CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 584 } else { 585 // Otherwise, just memset the whole thing to zero. This is legal 586 // because in LLVM, all default initializers are guaranteed to have a 587 // bit pattern of all zeros. 588 // FIXME: That isn't true for member pointers! 589 // There's a potential optimization opportunity in combining 590 // memsets; that would be easy for arrays, but relatively 591 // difficult for structures with the current code. 592 CGF.EmitMemSetToZero(LV.getAddress(), T); 593 } 594} 595 596void AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 597#if 0 598 // FIXME: Assess perf here? Figure out what cases are worth optimizing here 599 // (Length of globals? Chunks of zeroed-out space?). 600 // 601 // If we can, prefer a copy from a global; this is a lot less code for long 602 // globals, and it's easier for the current optimizers to analyze. 603 if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 604 llvm::GlobalVariable* GV = 605 new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 606 llvm::GlobalValue::InternalLinkage, C, ""); 607 EmitFinalDestCopy(E, LValue::MakeAddr(GV, Qualifiers())); 608 return; 609 } 610#endif 611 if (E->hadArrayRangeDesignator()) { 612 CGF.ErrorUnsupported(E, "GNU array range designator extension"); 613 } 614 615 // Handle initialization of an array. 616 if (E->getType()->isArrayType()) { 617 const llvm::PointerType *APType = 618 cast<llvm::PointerType>(DestPtr->getType()); 619 const llvm::ArrayType *AType = 620 cast<llvm::ArrayType>(APType->getElementType()); 621 622 uint64_t NumInitElements = E->getNumInits(); 623 624 if (E->getNumInits() > 0) { 625 QualType T1 = E->getType(); 626 QualType T2 = E->getInit(0)->getType(); 627 if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 628 EmitAggLoadOfLValue(E->getInit(0)); 629 return; 630 } 631 } 632 633 uint64_t NumArrayElements = AType->getNumElements(); 634 QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 635 ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 636 637 // FIXME: were we intentionally ignoring address spaces and GC attributes? 638 Qualifiers Quals = CGF.MakeQualifiers(ElementType); 639 640 for (uint64_t i = 0; i != NumArrayElements; ++i) { 641 llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 642 if (i < NumInitElements) 643 EmitInitializationToLValue(E->getInit(i), 644 LValue::MakeAddr(NextVal, Quals), 645 ElementType); 646 else 647 EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, Quals), 648 ElementType); 649 } 650 return; 651 } 652 653 assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 654 655 // Do struct initialization; this code just sets each individual member 656 // to the approprate value. This makes bitfield support automatic; 657 // the disadvantage is that the generated code is more difficult for 658 // the optimizer, especially with bitfields. 659 unsigned NumInitElements = E->getNumInits(); 660 RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 661 unsigned CurInitVal = 0; 662 663 if (E->getType()->isUnionType()) { 664 // Only initialize one field of a union. The field itself is 665 // specified by the initializer list. 666 if (!E->getInitializedFieldInUnion()) { 667 // Empty union; we have nothing to do. 668 669#ifndef NDEBUG 670 // Make sure that it's really an empty and not a failure of 671 // semantic analysis. 672 for (RecordDecl::field_iterator Field = SD->field_begin(), 673 FieldEnd = SD->field_end(); 674 Field != FieldEnd; ++Field) 675 assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 676#endif 677 return; 678 } 679 680 // FIXME: volatility 681 FieldDecl *Field = E->getInitializedFieldInUnion(); 682 LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 683 684 if (NumInitElements) { 685 // Store the initializer into the field 686 EmitInitializationToLValue(E->getInit(0), FieldLoc, Field->getType()); 687 } else { 688 // Default-initialize to null 689 EmitNullInitializationToLValue(FieldLoc, Field->getType()); 690 } 691 692 return; 693 } 694 695 // If we're initializing the whole aggregate, just do it in place. 696 // FIXME: This is a hack around an AST bug (PR6537). 697 if (NumInitElements == 1 && E->getType() == E->getInit(0)->getType()) { 698 EmitInitializationToLValue(E->getInit(0), 699 LValue::MakeAddr(DestPtr, Qualifiers()), 700 E->getType()); 701 return; 702 } 703 704 705 // Here we iterate over the fields; this makes it simpler to both 706 // default-initialize fields and skip over unnamed fields. 707 for (RecordDecl::field_iterator Field = SD->field_begin(), 708 FieldEnd = SD->field_end(); 709 Field != FieldEnd; ++Field) { 710 // We're done once we hit the flexible array member 711 if (Field->getType()->isIncompleteArrayType()) 712 break; 713 714 if (Field->isUnnamedBitfield()) 715 continue; 716 717 // FIXME: volatility 718 LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, *Field, 0); 719 // We never generate write-barries for initialized fields. 720 LValue::SetObjCNonGC(FieldLoc, true); 721 if (CurInitVal < NumInitElements) { 722 // Store the initializer into the field. 723 EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc, 724 Field->getType()); 725 } else { 726 // We're out of initalizers; default-initialize to null 727 EmitNullInitializationToLValue(FieldLoc, Field->getType()); 728 } 729 } 730} 731 732//===----------------------------------------------------------------------===// 733// Entry Points into this File 734//===----------------------------------------------------------------------===// 735 736/// EmitAggExpr - Emit the computation of the specified expression of aggregate 737/// type. The result is computed into DestPtr. Note that if DestPtr is null, 738/// the value of the aggregate expression is not needed. If VolatileDest is 739/// true, DestPtr cannot be 0. 740// 741// FIXME: Take Qualifiers object. 742void CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 743 bool VolatileDest, bool IgnoreResult, 744 bool IsInitializer, 745 bool RequiresGCollection) { 746 assert(E && hasAggregateLLVMType(E->getType()) && 747 "Invalid aggregate expression to emit"); 748 assert ((DestPtr != 0 || VolatileDest == false) 749 && "volatile aggregate can't be 0"); 750 751 AggExprEmitter(*this, DestPtr, VolatileDest, IgnoreResult, IsInitializer, 752 RequiresGCollection) 753 .Visit(const_cast<Expr*>(E)); 754} 755 756LValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 757 assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 758 Qualifiers Q = MakeQualifiers(E->getType()); 759 llvm::Value *Temp = CreateMemTemp(E->getType()); 760 EmitAggExpr(E, Temp, Q.hasVolatile()); 761 return LValue::MakeAddr(Temp, Q); 762} 763 764void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 765 llvm::Value *SrcPtr, QualType Ty, 766 bool isVolatile) { 767 assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 768 769 if (getContext().getLangOptions().CPlusPlus) { 770 if (const RecordType *RT = Ty->getAs<RecordType>()) { 771 CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 772 assert((Record->hasTrivialCopyConstructor() || 773 Record->hasTrivialCopyAssignment()) && 774 "Trying to aggregate-copy a type without a trivial copy " 775 "constructor or assignment operator"); 776 // Ignore empty classes in C++. 777 if (Record->isEmpty()) 778 return; 779 } 780 } 781 782 // Aggregate assignment turns into llvm.memcpy. This is almost valid per 783 // C99 6.5.16.1p3, which states "If the value being stored in an object is 784 // read from another object that overlaps in anyway the storage of the first 785 // object, then the overlap shall be exact and the two objects shall have 786 // qualified or unqualified versions of a compatible type." 787 // 788 // memcpy is not defined if the source and destination pointers are exactly 789 // equal, but other compilers do this optimization, and almost every memcpy 790 // implementation handles this case safely. If there is a libc that does not 791 // safely handle this, we can add a target hook. 792 const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext); 793 if (DestPtr->getType() != BP) 794 DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 795 if (SrcPtr->getType() != BP) 796 SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 797 798 // Get size and alignment info for this aggregate. 799 std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 800 801 // FIXME: Handle variable sized types. 802 const llvm::Type *IntPtr = 803 llvm::IntegerType::get(VMContext, LLVMPointerWidth); 804 805 // FIXME: If we have a volatile struct, the optimizer can remove what might 806 // appear to be `extra' memory ops: 807 // 808 // volatile struct { int i; } a, b; 809 // 810 // int main() { 811 // a = b; 812 // a = b; 813 // } 814 // 815 // we need to use a different call here. We use isVolatile to indicate when 816 // either the source or the destination is volatile. 817 const llvm::Type *I1Ty = llvm::Type::getInt1Ty(VMContext); 818 const llvm::Type *I8Ty = llvm::Type::getInt8Ty(VMContext); 819 const llvm::Type *I32Ty = llvm::Type::getInt32Ty(VMContext); 820 821 const llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 822 const llvm::Type *DBP = llvm::PointerType::get(I8Ty, DPT->getAddressSpace()); 823 if (DestPtr->getType() != DBP) 824 DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); 825 826 const llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 827 const llvm::Type *SBP = llvm::PointerType::get(I8Ty, SPT->getAddressSpace()); 828 if (SrcPtr->getType() != SBP) 829 SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); 830 831 Builder.CreateCall5(CGM.getMemCpyFn(DestPtr->getType(), SrcPtr->getType(), 832 IntPtr), 833 DestPtr, SrcPtr, 834 // TypeInfo.first describes size in bits. 835 llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 836 llvm::ConstantInt::get(I32Ty, TypeInfo.second/8), 837 llvm::ConstantInt::get(I1Ty, isVolatile)); 838} 839