CGExprAgg.cpp revision 207619
1193326Sed//===--- CGExprAgg.cpp - Emit LLVM Code from Aggregate Expressions --------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10193326Sed// This contains code to emit Aggregate Expr nodes as LLVM code. 11193326Sed// 12193326Sed//===----------------------------------------------------------------------===// 13193326Sed 14193326Sed#include "CodeGenFunction.h" 15193326Sed#include "CodeGenModule.h" 16198092Srdivacky#include "CGObjCRuntime.h" 17193326Sed#include "clang/AST/ASTContext.h" 18193326Sed#include "clang/AST/DeclCXX.h" 19193326Sed#include "clang/AST/StmtVisitor.h" 20193326Sed#include "llvm/Constants.h" 21193326Sed#include "llvm/Function.h" 22193326Sed#include "llvm/GlobalVariable.h" 23193326Sed#include "llvm/Intrinsics.h" 24193326Sedusing namespace clang; 25193326Sedusing namespace CodeGen; 26193326Sed 27193326Sed//===----------------------------------------------------------------------===// 28193326Sed// Aggregate Expression Emitter 29193326Sed//===----------------------------------------------------------------------===// 30193326Sed 31193326Sednamespace { 32199990Srdivackyclass AggExprEmitter : public StmtVisitor<AggExprEmitter> { 33193326Sed CodeGenFunction &CGF; 34193326Sed CGBuilderTy &Builder; 35193326Sed llvm::Value *DestPtr; 36193326Sed bool VolatileDest; 37193326Sed bool IgnoreResult; 38198092Srdivacky bool IsInitializer; 39198092Srdivacky bool RequiresGCollection; 40193326Sedpublic: 41193326Sed AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool v, 42198092Srdivacky bool ignore, bool isinit, bool requiresGCollection) 43193326Sed : CGF(cgf), Builder(CGF.Builder), 44198092Srdivacky DestPtr(destPtr), VolatileDest(v), IgnoreResult(ignore), 45198092Srdivacky IsInitializer(isinit), RequiresGCollection(requiresGCollection) { 46193326Sed } 47193326Sed 48193326Sed //===--------------------------------------------------------------------===// 49193326Sed // Utilities 50193326Sed //===--------------------------------------------------------------------===// 51193326Sed 52193326Sed /// EmitAggLoadOfLValue - Given an expression with aggregate type that 53193326Sed /// represents a value lvalue, this method emits the address of the lvalue, 54193326Sed /// then loads the result into DestPtr. 55193326Sed void EmitAggLoadOfLValue(const Expr *E); 56193326Sed 57193326Sed /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 58193326Sed void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 59193326Sed void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 60193326Sed 61193326Sed //===--------------------------------------------------------------------===// 62193326Sed // Visitor Methods 63193326Sed //===--------------------------------------------------------------------===// 64198092Srdivacky 65193326Sed void VisitStmt(Stmt *S) { 66193326Sed CGF.ErrorUnsupported(S, "aggregate expression"); 67193326Sed } 68193326Sed void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 69193326Sed void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 70193326Sed 71193326Sed // l-values. 72193326Sed void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 73193326Sed void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 74193326Sed void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 75193326Sed void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 76193326Sed void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 77198092Srdivacky EmitAggLoadOfLValue(E); 78193326Sed } 79193326Sed void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 80193326Sed EmitAggLoadOfLValue(E); 81193326Sed } 82193326Sed void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 83198092Srdivacky EmitAggLoadOfLValue(E); 84193326Sed } 85193326Sed void VisitPredefinedExpr(const PredefinedExpr *E) { 86198092Srdivacky EmitAggLoadOfLValue(E); 87193326Sed } 88198092Srdivacky 89193326Sed // Operators. 90198092Srdivacky void VisitCastExpr(CastExpr *E); 91193326Sed void VisitCallExpr(const CallExpr *E); 92193326Sed void VisitStmtExpr(const StmtExpr *E); 93193326Sed void VisitBinaryOperator(const BinaryOperator *BO); 94198398Srdivacky void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 95193326Sed void VisitBinAssign(const BinaryOperator *E); 96193326Sed void VisitBinComma(const BinaryOperator *E); 97198092Srdivacky void VisitUnaryAddrOf(const UnaryOperator *E); 98193326Sed 99193326Sed void VisitObjCMessageExpr(ObjCMessageExpr *E); 100193326Sed void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 101193326Sed EmitAggLoadOfLValue(E); 102193326Sed } 103193326Sed void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 104198092Srdivacky void VisitObjCImplicitSetterGetterRefExpr(ObjCImplicitSetterGetterRefExpr *E); 105198092Srdivacky 106193326Sed void VisitConditionalOperator(const ConditionalOperator *CO); 107198092Srdivacky void VisitChooseExpr(const ChooseExpr *CE); 108193326Sed void VisitInitListExpr(InitListExpr *E); 109201361Srdivacky void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 110193326Sed void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 111193326Sed Visit(DAE->getExpr()); 112193326Sed } 113193326Sed void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 114193326Sed void VisitCXXConstructExpr(const CXXConstructExpr *E); 115193326Sed void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 116198398Srdivacky void VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E); 117199482Srdivacky void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 118193326Sed 119193326Sed void VisitVAArgExpr(VAArgExpr *E); 120193326Sed 121203955Srdivacky void EmitInitializationToLValue(Expr *E, LValue Address, QualType T); 122193326Sed void EmitNullInitializationToLValue(LValue Address, QualType T); 123193326Sed // case Expr::ChooseExprClass: 124200583Srdivacky void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 125193326Sed}; 126193326Sed} // end anonymous namespace. 127193326Sed 128193326Sed//===----------------------------------------------------------------------===// 129193326Sed// Utilities 130193326Sed//===----------------------------------------------------------------------===// 131193326Sed 132193326Sed/// EmitAggLoadOfLValue - Given an expression with aggregate type that 133193326Sed/// represents a value lvalue, this method emits the address of the lvalue, 134193326Sed/// then loads the result into DestPtr. 135193326Sedvoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 136193326Sed LValue LV = CGF.EmitLValue(E); 137193326Sed EmitFinalDestCopy(E, LV); 138193326Sed} 139193326Sed 140193326Sed/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 141193326Sedvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 142193326Sed assert(Src.isAggregate() && "value must be aggregate value!"); 143193326Sed 144193326Sed // If the result is ignored, don't copy from the value. 145193326Sed if (DestPtr == 0) { 146193326Sed if (!Src.isVolatileQualified() || (IgnoreResult && Ignore)) 147193326Sed return; 148193326Sed // If the source is volatile, we must read from it; to do that, we need 149193326Sed // some place to put it. 150203955Srdivacky DestPtr = CGF.CreateMemTemp(E->getType(), "agg.tmp"); 151193326Sed } 152193326Sed 153198092Srdivacky if (RequiresGCollection) { 154198092Srdivacky CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 155198092Srdivacky DestPtr, Src.getAggregateAddr(), 156198092Srdivacky E->getType()); 157198092Srdivacky return; 158198092Srdivacky } 159193326Sed // If the result of the assignment is used, copy the LHS there also. 160193326Sed // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 161193326Sed // from the source as well, as we can't eliminate it if either operand 162193326Sed // is volatile, unless copy has volatile for both source and destination.. 163193326Sed CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType(), 164193326Sed VolatileDest|Src.isVolatileQualified()); 165193326Sed} 166193326Sed 167193326Sed/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 168193326Sedvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 169193326Sed assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 170193326Sed 171193326Sed EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 172193326Sed Src.isVolatileQualified()), 173193326Sed Ignore); 174193326Sed} 175193326Sed 176193326Sed//===----------------------------------------------------------------------===// 177193326Sed// Visitor Methods 178193326Sed//===----------------------------------------------------------------------===// 179193326Sed 180198092Srdivackyvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 181204962Srdivacky if (!DestPtr) { 182204962Srdivacky Visit(E->getSubExpr()); 183204962Srdivacky return; 184204962Srdivacky } 185204962Srdivacky 186198092Srdivacky switch (E->getCastKind()) { 187198092Srdivacky default: assert(0 && "Unhandled cast kind!"); 188198092Srdivacky 189198092Srdivacky case CastExpr::CK_ToUnion: { 190198092Srdivacky // GCC union extension 191193401Sed QualType PtrTy = 192198092Srdivacky CGF.getContext().getPointerType(E->getSubExpr()->getType()); 193193401Sed llvm::Value *CastPtr = Builder.CreateBitCast(DestPtr, 194193401Sed CGF.ConvertType(PtrTy)); 195198092Srdivacky EmitInitializationToLValue(E->getSubExpr(), 196203955Srdivacky LValue::MakeAddr(CastPtr, Qualifiers()), 197204643Srdivacky E->getSubExpr()->getType()); 198198092Srdivacky break; 199193326Sed } 200193326Sed 201198092Srdivacky // FIXME: Remove the CK_Unknown check here. 202198092Srdivacky case CastExpr::CK_Unknown: 203198092Srdivacky case CastExpr::CK_NoOp: 204198092Srdivacky case CastExpr::CK_UserDefinedConversion: 205198092Srdivacky case CastExpr::CK_ConstructorConversion: 206198092Srdivacky assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 207198092Srdivacky E->getType()) && 208198092Srdivacky "Implicit cast types must be compatible"); 209198092Srdivacky Visit(E->getSubExpr()); 210198092Srdivacky break; 211193326Sed 212198092Srdivacky case CastExpr::CK_NullToMemberPointer: { 213204962Srdivacky // If the subexpression's type is the C++0x nullptr_t, emit the 214204962Srdivacky // subexpression, which may have side effects. 215204962Srdivacky if (E->getSubExpr()->getType()->isNullPtrType()) 216204962Srdivacky Visit(E->getSubExpr()); 217204962Srdivacky 218198092Srdivacky const llvm::Type *PtrDiffTy = 219198092Srdivacky CGF.ConvertType(CGF.getContext().getPointerDiffType()); 220198092Srdivacky 221198092Srdivacky llvm::Value *NullValue = llvm::Constant::getNullValue(PtrDiffTy); 222198092Srdivacky llvm::Value *Ptr = Builder.CreateStructGEP(DestPtr, 0, "ptr"); 223198092Srdivacky Builder.CreateStore(NullValue, Ptr, VolatileDest); 224198092Srdivacky 225198092Srdivacky llvm::Value *Adj = Builder.CreateStructGEP(DestPtr, 1, "adj"); 226198092Srdivacky Builder.CreateStore(NullValue, Adj, VolatileDest); 227198092Srdivacky 228198092Srdivacky break; 229198092Srdivacky } 230198092Srdivacky 231198398Srdivacky case CastExpr::CK_BitCast: { 232198398Srdivacky // This must be a member function pointer cast. 233198398Srdivacky Visit(E->getSubExpr()); 234198398Srdivacky break; 235198398Srdivacky } 236198398Srdivacky 237199990Srdivacky case CastExpr::CK_DerivedToBaseMemberPointer: 238198092Srdivacky case CastExpr::CK_BaseToDerivedMemberPointer: { 239198092Srdivacky QualType SrcType = E->getSubExpr()->getType(); 240198092Srdivacky 241203955Srdivacky llvm::Value *Src = CGF.CreateMemTemp(SrcType, "tmp"); 242198092Srdivacky CGF.EmitAggExpr(E->getSubExpr(), Src, SrcType.isVolatileQualified()); 243198092Srdivacky 244198092Srdivacky llvm::Value *SrcPtr = Builder.CreateStructGEP(Src, 0, "src.ptr"); 245198092Srdivacky SrcPtr = Builder.CreateLoad(SrcPtr); 246198092Srdivacky 247198092Srdivacky llvm::Value *SrcAdj = Builder.CreateStructGEP(Src, 1, "src.adj"); 248198092Srdivacky SrcAdj = Builder.CreateLoad(SrcAdj); 249198092Srdivacky 250198092Srdivacky llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 251198092Srdivacky Builder.CreateStore(SrcPtr, DstPtr, VolatileDest); 252198092Srdivacky 253198092Srdivacky llvm::Value *DstAdj = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 254198092Srdivacky 255198092Srdivacky // Now See if we need to update the adjustment. 256199990Srdivacky const CXXRecordDecl *BaseDecl = 257198092Srdivacky cast<CXXRecordDecl>(SrcType->getAs<MemberPointerType>()-> 258198092Srdivacky getClass()->getAs<RecordType>()->getDecl()); 259199990Srdivacky const CXXRecordDecl *DerivedDecl = 260198092Srdivacky cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()-> 261198092Srdivacky getClass()->getAs<RecordType>()->getDecl()); 262199990Srdivacky if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 263199990Srdivacky std::swap(DerivedDecl, BaseDecl); 264199990Srdivacky 265203955Srdivacky if (llvm::Constant *Adj = 266207619Srdivacky CGF.CGM.GetNonVirtualBaseClassOffset(DerivedDecl, E->getBasePath())) { 267199990Srdivacky if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 268199990Srdivacky SrcAdj = Builder.CreateSub(SrcAdj, Adj, "adj"); 269199990Srdivacky else 270199990Srdivacky SrcAdj = Builder.CreateAdd(SrcAdj, Adj, "adj"); 271199990Srdivacky } 272198092Srdivacky 273198092Srdivacky Builder.CreateStore(SrcAdj, DstAdj, VolatileDest); 274198092Srdivacky break; 275198092Srdivacky } 276198092Srdivacky } 277193326Sed} 278193326Sed 279193326Sedvoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 280193326Sed if (E->getCallReturnType()->isReferenceType()) { 281193326Sed EmitAggLoadOfLValue(E); 282193326Sed return; 283193326Sed } 284198092Srdivacky 285201361Srdivacky // If the struct doesn't require GC, we can just pass the destination 286201361Srdivacky // directly to EmitCall. 287201361Srdivacky if (!RequiresGCollection) { 288201361Srdivacky CGF.EmitCallExpr(E, ReturnValueSlot(DestPtr, VolatileDest)); 289201361Srdivacky return; 290201361Srdivacky } 291201361Srdivacky 292193326Sed RValue RV = CGF.EmitCallExpr(E); 293193326Sed EmitFinalDestCopy(E, RV); 294193326Sed} 295193326Sed 296193326Sedvoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 297193326Sed RValue RV = CGF.EmitObjCMessageExpr(E); 298193326Sed EmitFinalDestCopy(E, RV); 299193326Sed} 300193326Sed 301193326Sedvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 302193326Sed RValue RV = CGF.EmitObjCPropertyGet(E); 303193326Sed EmitFinalDestCopy(E, RV); 304193326Sed} 305193326Sed 306198092Srdivackyvoid AggExprEmitter::VisitObjCImplicitSetterGetterRefExpr( 307198092Srdivacky ObjCImplicitSetterGetterRefExpr *E) { 308193326Sed RValue RV = CGF.EmitObjCPropertyGet(E); 309193326Sed EmitFinalDestCopy(E, RV); 310193326Sed} 311193326Sed 312193326Sedvoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 313193326Sed CGF.EmitAnyExpr(E->getLHS(), 0, false, true); 314198092Srdivacky CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest, 315198092Srdivacky /*IgnoreResult=*/false, IsInitializer); 316193326Sed} 317193326Sed 318198092Srdivackyvoid AggExprEmitter::VisitUnaryAddrOf(const UnaryOperator *E) { 319198092Srdivacky // We have a member function pointer. 320198092Srdivacky const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>(); 321198398Srdivacky (void) MPT; 322198092Srdivacky assert(MPT->getPointeeType()->isFunctionProtoType() && 323198092Srdivacky "Unexpected member pointer type!"); 324207619Srdivacky 325207619Srdivacky // The creation of member function pointers has no side effects; if 326207619Srdivacky // there is no destination pointer, we have nothing to do. 327207619Srdivacky if (!DestPtr) 328207619Srdivacky return; 329198092Srdivacky 330198893Srdivacky const DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr()); 331202379Srdivacky const CXXMethodDecl *MD = 332202379Srdivacky cast<CXXMethodDecl>(DRE->getDecl())->getCanonicalDecl(); 333198092Srdivacky 334198092Srdivacky const llvm::Type *PtrDiffTy = 335198092Srdivacky CGF.ConvertType(CGF.getContext().getPointerDiffType()); 336198092Srdivacky 337207619Srdivacky 338198092Srdivacky llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 339198092Srdivacky llvm::Value *FuncPtr; 340198092Srdivacky 341198092Srdivacky if (MD->isVirtual()) { 342207619Srdivacky int64_t Index = CGF.CGM.getVTables().getMethodVTableIndex(MD); 343198092Srdivacky 344207619Srdivacky // FIXME: We shouldn't use / 8 here. 345207619Srdivacky uint64_t PointerWidthInBytes = 346207619Srdivacky CGF.CGM.getContext().Target.getPointerWidth(0) / 8; 347207619Srdivacky 348203955Srdivacky // Itanium C++ ABI 2.3: 349203955Srdivacky // For a non-virtual function, this field is a simple function pointer. 350203955Srdivacky // For a virtual function, it is 1 plus the virtual table offset 351203955Srdivacky // (in bytes) of the function, represented as a ptrdiff_t. 352207619Srdivacky FuncPtr = llvm::ConstantInt::get(PtrDiffTy, 353207619Srdivacky (Index * PointerWidthInBytes) + 1); 354198092Srdivacky } else { 355203955Srdivacky const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); 356203955Srdivacky const llvm::Type *Ty = 357203955Srdivacky CGF.CGM.getTypes().GetFunctionType(CGF.CGM.getTypes().getFunctionInfo(MD), 358203955Srdivacky FPT->isVariadic()); 359203955Srdivacky llvm::Constant *Fn = CGF.CGM.GetAddrOfFunction(MD, Ty); 360203955Srdivacky FuncPtr = llvm::ConstantExpr::getPtrToInt(Fn, PtrDiffTy); 361198092Srdivacky } 362198092Srdivacky Builder.CreateStore(FuncPtr, DstPtr, VolatileDest); 363198092Srdivacky 364198092Srdivacky llvm::Value *AdjPtr = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 365198092Srdivacky 366198092Srdivacky // The adjustment will always be 0. 367198092Srdivacky Builder.CreateStore(llvm::ConstantInt::get(PtrDiffTy, 0), AdjPtr, 368198092Srdivacky VolatileDest); 369198092Srdivacky} 370198092Srdivacky 371193326Sedvoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 372193326Sed CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 373193326Sed} 374193326Sed 375193326Sedvoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 376198893Srdivacky if (E->getOpcode() == BinaryOperator::PtrMemD || 377198893Srdivacky E->getOpcode() == BinaryOperator::PtrMemI) 378198398Srdivacky VisitPointerToDataMemberBinaryOperator(E); 379198398Srdivacky else 380198398Srdivacky CGF.ErrorUnsupported(E, "aggregate binary expression"); 381193326Sed} 382193326Sed 383198398Srdivackyvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 384198398Srdivacky const BinaryOperator *E) { 385198398Srdivacky LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 386198398Srdivacky EmitFinalDestCopy(E, LV); 387198398Srdivacky} 388198398Srdivacky 389193326Sedvoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 390193326Sed // For an assignment to work, the value on the right has 391193326Sed // to be compatible with the value on the left. 392193326Sed assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 393193326Sed E->getRHS()->getType()) 394193326Sed && "Invalid assignment"); 395193326Sed LValue LHS = CGF.EmitLValue(E->getLHS()); 396193326Sed 397193326Sed // We have to special case property setters, otherwise we must have 398193326Sed // a simple lvalue (no aggregates inside vectors, bitfields). 399193326Sed if (LHS.isPropertyRef()) { 400193326Sed llvm::Value *AggLoc = DestPtr; 401193326Sed if (!AggLoc) 402203955Srdivacky AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 403193326Sed CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 404198092Srdivacky CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 405193326Sed RValue::getAggregate(AggLoc, VolatileDest)); 406198092Srdivacky } else if (LHS.isKVCRef()) { 407193326Sed llvm::Value *AggLoc = DestPtr; 408193326Sed if (!AggLoc) 409203955Srdivacky AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 410193326Sed CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 411198092Srdivacky CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 412193326Sed RValue::getAggregate(AggLoc, VolatileDest)); 413193326Sed } else { 414198092Srdivacky bool RequiresGCollection = false; 415198092Srdivacky if (CGF.getContext().getLangOptions().NeXTRuntime) { 416198092Srdivacky QualType LHSTy = E->getLHS()->getType(); 417198092Srdivacky if (const RecordType *FDTTy = LHSTy.getTypePtr()->getAs<RecordType>()) 418198092Srdivacky RequiresGCollection = FDTTy->getDecl()->hasObjectMember(); 419198092Srdivacky } 420193326Sed // Codegen the RHS so that it stores directly into the LHS. 421198092Srdivacky CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified(), 422198092Srdivacky false, false, RequiresGCollection); 423193326Sed EmitFinalDestCopy(E, LHS, true); 424193326Sed } 425193326Sed} 426193326Sed 427193326Sedvoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 428201361Srdivacky if (!E->getLHS()) { 429201361Srdivacky CGF.ErrorUnsupported(E, "conditional operator with missing LHS"); 430201361Srdivacky return; 431201361Srdivacky } 432201361Srdivacky 433193326Sed llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 434193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 435193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 436198092Srdivacky 437201361Srdivacky CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 438198092Srdivacky 439203955Srdivacky CGF.BeginConditionalBranch(); 440193326Sed CGF.EmitBlock(LHSBlock); 441198092Srdivacky 442193326Sed // Handle the GNU extension for missing LHS. 443193326Sed assert(E->getLHS() && "Must have LHS for aggregate value"); 444193326Sed 445193326Sed Visit(E->getLHS()); 446203955Srdivacky CGF.EndConditionalBranch(); 447193326Sed CGF.EmitBranch(ContBlock); 448198092Srdivacky 449203955Srdivacky CGF.BeginConditionalBranch(); 450193326Sed CGF.EmitBlock(RHSBlock); 451198092Srdivacky 452193326Sed Visit(E->getRHS()); 453203955Srdivacky CGF.EndConditionalBranch(); 454193326Sed CGF.EmitBranch(ContBlock); 455198092Srdivacky 456193326Sed CGF.EmitBlock(ContBlock); 457193326Sed} 458193326Sed 459198092Srdivackyvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 460198092Srdivacky Visit(CE->getChosenSubExpr(CGF.getContext())); 461198092Srdivacky} 462198092Srdivacky 463193326Sedvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 464193326Sed llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 465193326Sed llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 466193326Sed 467193326Sed if (!ArgPtr) { 468193326Sed CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 469193326Sed return; 470193326Sed } 471193326Sed 472198092Srdivacky EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, Qualifiers())); 473193326Sed} 474193326Sed 475193326Sedvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 476193326Sed llvm::Value *Val = DestPtr; 477198092Srdivacky 478193326Sed if (!Val) { 479193326Sed // Create a temporary variable. 480203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 481193326Sed 482193326Sed // FIXME: volatile 483193326Sed CGF.EmitAggExpr(E->getSubExpr(), Val, false); 484198092Srdivacky } else 485193326Sed Visit(E->getSubExpr()); 486198092Srdivacky 487198092Srdivacky // Don't make this a live temporary if we're emitting an initializer expr. 488198092Srdivacky if (!IsInitializer) 489198092Srdivacky CGF.PushCXXTemporary(E->getTemporary(), Val); 490193326Sed} 491193326Sed 492193326Sedvoid 493193326SedAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 494193326Sed llvm::Value *Val = DestPtr; 495198092Srdivacky 496193326Sed if (!Val) { 497193326Sed // Create a temporary variable. 498203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 499193326Sed } 500193326Sed 501201361Srdivacky if (E->requiresZeroInitialization()) 502201361Srdivacky EmitNullInitializationToLValue(LValue::MakeAddr(Val, 503201361Srdivacky // FIXME: Qualifiers()? 504201361Srdivacky E->getType().getQualifiers()), 505201361Srdivacky E->getType()); 506201361Srdivacky 507193326Sed CGF.EmitCXXConstructExpr(Val, E); 508193326Sed} 509193326Sed 510193326Sedvoid AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 511201361Srdivacky llvm::Value *Val = DestPtr; 512201361Srdivacky 513201361Srdivacky CGF.EmitCXXExprWithTemporaries(E, Val, VolatileDest, IsInitializer); 514193326Sed} 515193326Sed 516198398Srdivackyvoid AggExprEmitter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) { 517201361Srdivacky llvm::Value *Val = DestPtr; 518201361Srdivacky 519201361Srdivacky if (!Val) { 520201361Srdivacky // Create a temporary variable. 521203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 522201361Srdivacky } 523201361Srdivacky LValue LV = LValue::MakeAddr(Val, Qualifiers()); 524201361Srdivacky EmitNullInitializationToLValue(LV, E->getType()); 525198398Srdivacky} 526198398Srdivacky 527201361Srdivackyvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 528201361Srdivacky llvm::Value *Val = DestPtr; 529201361Srdivacky 530201361Srdivacky if (!Val) { 531201361Srdivacky // Create a temporary variable. 532203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 533201361Srdivacky } 534201361Srdivacky LValue LV = LValue::MakeAddr(Val, Qualifiers()); 535201361Srdivacky EmitNullInitializationToLValue(LV, E->getType()); 536201361Srdivacky} 537201361Srdivacky 538203955Srdivackyvoid 539203955SrdivackyAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV, QualType T) { 540193326Sed // FIXME: Ignore result? 541193326Sed // FIXME: Are initializers affected by volatile? 542193326Sed if (isa<ImplicitValueInitExpr>(E)) { 543203955Srdivacky EmitNullInitializationToLValue(LV, T); 544203955Srdivacky } else if (T->isReferenceType()) { 545203955Srdivacky RValue RV = CGF.EmitReferenceBindingToExpr(E, /*IsInitializer=*/false); 546203955Srdivacky CGF.EmitStoreThroughLValue(RV, LV, T); 547203955Srdivacky } else if (T->isAnyComplexType()) { 548193326Sed CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 549203955Srdivacky } else if (CGF.hasAggregateLLVMType(T)) { 550193326Sed CGF.EmitAnyExpr(E, LV.getAddress(), false); 551193326Sed } else { 552203955Srdivacky CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, T); 553193326Sed } 554193326Sed} 555193326Sed 556193326Sedvoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 557193326Sed if (!CGF.hasAggregateLLVMType(T)) { 558193326Sed // For non-aggregates, we can store zero 559193326Sed llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 560193326Sed CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 561193326Sed } else { 562193326Sed // Otherwise, just memset the whole thing to zero. This is legal 563193326Sed // because in LLVM, all default initializers are guaranteed to have a 564193326Sed // bit pattern of all zeros. 565193326Sed // FIXME: That isn't true for member pointers! 566193326Sed // There's a potential optimization opportunity in combining 567193326Sed // memsets; that would be easy for arrays, but relatively 568193326Sed // difficult for structures with the current code. 569193326Sed CGF.EmitMemSetToZero(LV.getAddress(), T); 570193326Sed } 571193326Sed} 572193326Sed 573193326Sedvoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 574193326Sed#if 0 575200583Srdivacky // FIXME: Assess perf here? Figure out what cases are worth optimizing here 576200583Srdivacky // (Length of globals? Chunks of zeroed-out space?). 577193326Sed // 578193326Sed // If we can, prefer a copy from a global; this is a lot less code for long 579193326Sed // globals, and it's easier for the current optimizers to analyze. 580200583Srdivacky if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 581193326Sed llvm::GlobalVariable* GV = 582200583Srdivacky new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 583200583Srdivacky llvm::GlobalValue::InternalLinkage, C, ""); 584200583Srdivacky EmitFinalDestCopy(E, LValue::MakeAddr(GV, Qualifiers())); 585193326Sed return; 586193326Sed } 587193326Sed#endif 588193326Sed if (E->hadArrayRangeDesignator()) { 589193326Sed CGF.ErrorUnsupported(E, "GNU array range designator extension"); 590193326Sed } 591193326Sed 592193326Sed // Handle initialization of an array. 593193326Sed if (E->getType()->isArrayType()) { 594193326Sed const llvm::PointerType *APType = 595193326Sed cast<llvm::PointerType>(DestPtr->getType()); 596193326Sed const llvm::ArrayType *AType = 597193326Sed cast<llvm::ArrayType>(APType->getElementType()); 598198092Srdivacky 599193326Sed uint64_t NumInitElements = E->getNumInits(); 600193326Sed 601193326Sed if (E->getNumInits() > 0) { 602193326Sed QualType T1 = E->getType(); 603193326Sed QualType T2 = E->getInit(0)->getType(); 604193326Sed if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 605193326Sed EmitAggLoadOfLValue(E->getInit(0)); 606193326Sed return; 607193326Sed } 608193326Sed } 609193326Sed 610193326Sed uint64_t NumArrayElements = AType->getNumElements(); 611193326Sed QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 612193326Sed ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 613193326Sed 614198092Srdivacky // FIXME: were we intentionally ignoring address spaces and GC attributes? 615198092Srdivacky Qualifiers Quals = CGF.MakeQualifiers(ElementType); 616198092Srdivacky 617193326Sed for (uint64_t i = 0; i != NumArrayElements; ++i) { 618193326Sed llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 619193326Sed if (i < NumInitElements) 620193326Sed EmitInitializationToLValue(E->getInit(i), 621203955Srdivacky LValue::MakeAddr(NextVal, Quals), 622203955Srdivacky ElementType); 623193326Sed else 624198092Srdivacky EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, Quals), 625193326Sed ElementType); 626193326Sed } 627193326Sed return; 628193326Sed } 629198092Srdivacky 630193326Sed assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 631198092Srdivacky 632193326Sed // Do struct initialization; this code just sets each individual member 633193326Sed // to the approprate value. This makes bitfield support automatic; 634193326Sed // the disadvantage is that the generated code is more difficult for 635193326Sed // the optimizer, especially with bitfields. 636193326Sed unsigned NumInitElements = E->getNumInits(); 637198092Srdivacky RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 638193326Sed unsigned CurInitVal = 0; 639193326Sed 640193326Sed if (E->getType()->isUnionType()) { 641193326Sed // Only initialize one field of a union. The field itself is 642193326Sed // specified by the initializer list. 643193326Sed if (!E->getInitializedFieldInUnion()) { 644193326Sed // Empty union; we have nothing to do. 645198092Srdivacky 646193326Sed#ifndef NDEBUG 647193326Sed // Make sure that it's really an empty and not a failure of 648193326Sed // semantic analysis. 649195341Sed for (RecordDecl::field_iterator Field = SD->field_begin(), 650195341Sed FieldEnd = SD->field_end(); 651193326Sed Field != FieldEnd; ++Field) 652193326Sed assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 653193326Sed#endif 654193326Sed return; 655193326Sed } 656193326Sed 657193326Sed // FIXME: volatility 658193326Sed FieldDecl *Field = E->getInitializedFieldInUnion(); 659203955Srdivacky LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 660193326Sed 661193326Sed if (NumInitElements) { 662193326Sed // Store the initializer into the field 663203955Srdivacky EmitInitializationToLValue(E->getInit(0), FieldLoc, Field->getType()); 664193326Sed } else { 665193326Sed // Default-initialize to null 666193326Sed EmitNullInitializationToLValue(FieldLoc, Field->getType()); 667193326Sed } 668193326Sed 669193326Sed return; 670193326Sed } 671204962Srdivacky 672204962Srdivacky // If we're initializing the whole aggregate, just do it in place. 673204962Srdivacky // FIXME: This is a hack around an AST bug (PR6537). 674204962Srdivacky if (NumInitElements == 1 && E->getType() == E->getInit(0)->getType()) { 675204962Srdivacky EmitInitializationToLValue(E->getInit(0), 676204962Srdivacky LValue::MakeAddr(DestPtr, Qualifiers()), 677204962Srdivacky E->getType()); 678204962Srdivacky return; 679204962Srdivacky } 680204962Srdivacky 681198092Srdivacky 682193326Sed // Here we iterate over the fields; this makes it simpler to both 683193326Sed // default-initialize fields and skip over unnamed fields. 684195341Sed for (RecordDecl::field_iterator Field = SD->field_begin(), 685195341Sed FieldEnd = SD->field_end(); 686193326Sed Field != FieldEnd; ++Field) { 687193326Sed // We're done once we hit the flexible array member 688193326Sed if (Field->getType()->isIncompleteArrayType()) 689193326Sed break; 690193326Sed 691193326Sed if (Field->isUnnamedBitfield()) 692193326Sed continue; 693193326Sed 694193326Sed // FIXME: volatility 695203955Srdivacky LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, *Field, 0); 696193326Sed // We never generate write-barries for initialized fields. 697193326Sed LValue::SetObjCNonGC(FieldLoc, true); 698193326Sed if (CurInitVal < NumInitElements) { 699204962Srdivacky // Store the initializer into the field. 700204962Srdivacky EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc, 701203955Srdivacky Field->getType()); 702193326Sed } else { 703193326Sed // We're out of initalizers; default-initialize to null 704193326Sed EmitNullInitializationToLValue(FieldLoc, Field->getType()); 705193326Sed } 706193326Sed } 707193326Sed} 708193326Sed 709193326Sed//===----------------------------------------------------------------------===// 710193326Sed// Entry Points into this File 711193326Sed//===----------------------------------------------------------------------===// 712193326Sed 713193326Sed/// EmitAggExpr - Emit the computation of the specified expression of aggregate 714193326Sed/// type. The result is computed into DestPtr. Note that if DestPtr is null, 715193326Sed/// the value of the aggregate expression is not needed. If VolatileDest is 716193326Sed/// true, DestPtr cannot be 0. 717203955Srdivacky// 718203955Srdivacky// FIXME: Take Qualifiers object. 719193326Sedvoid CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 720198092Srdivacky bool VolatileDest, bool IgnoreResult, 721198092Srdivacky bool IsInitializer, 722198092Srdivacky bool RequiresGCollection) { 723193326Sed assert(E && hasAggregateLLVMType(E->getType()) && 724193326Sed "Invalid aggregate expression to emit"); 725193326Sed assert ((DestPtr != 0 || VolatileDest == false) 726193326Sed && "volatile aggregate can't be 0"); 727198092Srdivacky 728198092Srdivacky AggExprEmitter(*this, DestPtr, VolatileDest, IgnoreResult, IsInitializer, 729198092Srdivacky RequiresGCollection) 730193326Sed .Visit(const_cast<Expr*>(E)); 731193326Sed} 732193326Sed 733203955SrdivackyLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 734203955Srdivacky assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 735203955Srdivacky Qualifiers Q = MakeQualifiers(E->getType()); 736203955Srdivacky llvm::Value *Temp = CreateMemTemp(E->getType()); 737203955Srdivacky EmitAggExpr(E, Temp, Q.hasVolatile()); 738203955Srdivacky return LValue::MakeAddr(Temp, Q); 739203955Srdivacky} 740203955Srdivacky 741193326Sedvoid CodeGenFunction::EmitAggregateClear(llvm::Value *DestPtr, QualType Ty) { 742193326Sed assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 743193326Sed 744193326Sed EmitMemSetToZero(DestPtr, Ty); 745193326Sed} 746193326Sed 747193326Sedvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 748193326Sed llvm::Value *SrcPtr, QualType Ty, 749193326Sed bool isVolatile) { 750193326Sed assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 751198092Srdivacky 752207619Srdivacky // Ignore empty classes in C++. 753207619Srdivacky if (getContext().getLangOptions().CPlusPlus) { 754207619Srdivacky if (const RecordType *RT = Ty->getAs<RecordType>()) { 755207619Srdivacky if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty()) 756207619Srdivacky return; 757207619Srdivacky } 758207619Srdivacky } 759207619Srdivacky 760193326Sed // Aggregate assignment turns into llvm.memcpy. This is almost valid per 761193326Sed // C99 6.5.16.1p3, which states "If the value being stored in an object is 762193326Sed // read from another object that overlaps in anyway the storage of the first 763193326Sed // object, then the overlap shall be exact and the two objects shall have 764193326Sed // qualified or unqualified versions of a compatible type." 765193326Sed // 766193326Sed // memcpy is not defined if the source and destination pointers are exactly 767193326Sed // equal, but other compilers do this optimization, and almost every memcpy 768193326Sed // implementation handles this case safely. If there is a libc that does not 769193326Sed // safely handle this, we can add a target hook. 770198092Srdivacky const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext); 771193326Sed if (DestPtr->getType() != BP) 772193326Sed DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 773193326Sed if (SrcPtr->getType() != BP) 774193326Sed SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 775198092Srdivacky 776193326Sed // Get size and alignment info for this aggregate. 777193326Sed std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 778198092Srdivacky 779193326Sed // FIXME: Handle variable sized types. 780198092Srdivacky const llvm::Type *IntPtr = 781198092Srdivacky llvm::IntegerType::get(VMContext, LLVMPointerWidth); 782198092Srdivacky 783193326Sed // FIXME: If we have a volatile struct, the optimizer can remove what might 784193326Sed // appear to be `extra' memory ops: 785193326Sed // 786193326Sed // volatile struct { int i; } a, b; 787193326Sed // 788193326Sed // int main() { 789193326Sed // a = b; 790193326Sed // a = b; 791193326Sed // } 792193326Sed // 793206275Srdivacky // we need to use a different call here. We use isVolatile to indicate when 794193326Sed // either the source or the destination is volatile. 795206275Srdivacky const llvm::Type *I1Ty = llvm::Type::getInt1Ty(VMContext); 796206275Srdivacky const llvm::Type *I8Ty = llvm::Type::getInt8Ty(VMContext); 797206275Srdivacky const llvm::Type *I32Ty = llvm::Type::getInt32Ty(VMContext); 798206275Srdivacky 799206275Srdivacky const llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 800206275Srdivacky const llvm::Type *DBP = llvm::PointerType::get(I8Ty, DPT->getAddressSpace()); 801206275Srdivacky if (DestPtr->getType() != DBP) 802206275Srdivacky DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); 803206275Srdivacky 804206275Srdivacky const llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 805206275Srdivacky const llvm::Type *SBP = llvm::PointerType::get(I8Ty, SPT->getAddressSpace()); 806206275Srdivacky if (SrcPtr->getType() != SBP) 807206275Srdivacky SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); 808206275Srdivacky 809206275Srdivacky Builder.CreateCall5(CGM.getMemCpyFn(DestPtr->getType(), SrcPtr->getType(), 810206275Srdivacky IntPtr), 811193326Sed DestPtr, SrcPtr, 812193326Sed // TypeInfo.first describes size in bits. 813193326Sed llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 814206275Srdivacky llvm::ConstantInt::get(I32Ty, TypeInfo.second/8), 815206275Srdivacky llvm::ConstantInt::get(I1Ty, isVolatile)); 816193326Sed} 817