CGExprAgg.cpp revision 208600
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; 40208600Srdivacky 41208600Srdivacky ReturnValueSlot getReturnValueSlot() const { 42208600Srdivacky // If the destination slot requires garbage collection, we can't 43208600Srdivacky // use the real return value slot, because we have to use the GC 44208600Srdivacky // API. 45208600Srdivacky if (RequiresGCollection) return ReturnValueSlot(); 46208600Srdivacky 47208600Srdivacky return ReturnValueSlot(DestPtr, VolatileDest); 48208600Srdivacky } 49208600Srdivacky 50193326Sedpublic: 51193326Sed AggExprEmitter(CodeGenFunction &cgf, llvm::Value *destPtr, bool v, 52198092Srdivacky bool ignore, bool isinit, bool requiresGCollection) 53193326Sed : CGF(cgf), Builder(CGF.Builder), 54198092Srdivacky DestPtr(destPtr), VolatileDest(v), IgnoreResult(ignore), 55198092Srdivacky IsInitializer(isinit), RequiresGCollection(requiresGCollection) { 56193326Sed } 57193326Sed 58193326Sed //===--------------------------------------------------------------------===// 59193326Sed // Utilities 60193326Sed //===--------------------------------------------------------------------===// 61193326Sed 62193326Sed /// EmitAggLoadOfLValue - Given an expression with aggregate type that 63193326Sed /// represents a value lvalue, this method emits the address of the lvalue, 64193326Sed /// then loads the result into DestPtr. 65193326Sed void EmitAggLoadOfLValue(const Expr *E); 66193326Sed 67193326Sed /// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 68193326Sed void EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore = false); 69193326Sed void EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore = false); 70193326Sed 71208600Srdivacky void EmitGCMove(const Expr *E, RValue Src); 72208600Srdivacky 73208600Srdivacky bool TypeRequiresGCollection(QualType T); 74208600Srdivacky 75193326Sed //===--------------------------------------------------------------------===// 76193326Sed // Visitor Methods 77193326Sed //===--------------------------------------------------------------------===// 78198092Srdivacky 79193326Sed void VisitStmt(Stmt *S) { 80193326Sed CGF.ErrorUnsupported(S, "aggregate expression"); 81193326Sed } 82193326Sed void VisitParenExpr(ParenExpr *PE) { Visit(PE->getSubExpr()); } 83193326Sed void VisitUnaryExtension(UnaryOperator *E) { Visit(E->getSubExpr()); } 84193326Sed 85193326Sed // l-values. 86193326Sed void VisitDeclRefExpr(DeclRefExpr *DRE) { EmitAggLoadOfLValue(DRE); } 87193326Sed void VisitMemberExpr(MemberExpr *ME) { EmitAggLoadOfLValue(ME); } 88193326Sed void VisitUnaryDeref(UnaryOperator *E) { EmitAggLoadOfLValue(E); } 89193326Sed void VisitStringLiteral(StringLiteral *E) { EmitAggLoadOfLValue(E); } 90193326Sed void VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { 91198092Srdivacky EmitAggLoadOfLValue(E); 92193326Sed } 93193326Sed void VisitArraySubscriptExpr(ArraySubscriptExpr *E) { 94193326Sed EmitAggLoadOfLValue(E); 95193326Sed } 96193326Sed void VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) { 97198092Srdivacky EmitAggLoadOfLValue(E); 98193326Sed } 99193326Sed void VisitPredefinedExpr(const PredefinedExpr *E) { 100198092Srdivacky EmitAggLoadOfLValue(E); 101193326Sed } 102198092Srdivacky 103193326Sed // Operators. 104198092Srdivacky void VisitCastExpr(CastExpr *E); 105193326Sed void VisitCallExpr(const CallExpr *E); 106193326Sed void VisitStmtExpr(const StmtExpr *E); 107193326Sed void VisitBinaryOperator(const BinaryOperator *BO); 108198398Srdivacky void VisitPointerToDataMemberBinaryOperator(const BinaryOperator *BO); 109193326Sed void VisitBinAssign(const BinaryOperator *E); 110193326Sed void VisitBinComma(const BinaryOperator *E); 111198092Srdivacky void VisitUnaryAddrOf(const UnaryOperator *E); 112193326Sed 113193326Sed void VisitObjCMessageExpr(ObjCMessageExpr *E); 114193326Sed void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) { 115193326Sed EmitAggLoadOfLValue(E); 116193326Sed } 117193326Sed void VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E); 118198092Srdivacky void VisitObjCImplicitSetterGetterRefExpr(ObjCImplicitSetterGetterRefExpr *E); 119198092Srdivacky 120193326Sed void VisitConditionalOperator(const ConditionalOperator *CO); 121198092Srdivacky void VisitChooseExpr(const ChooseExpr *CE); 122193326Sed void VisitInitListExpr(InitListExpr *E); 123201361Srdivacky void VisitImplicitValueInitExpr(ImplicitValueInitExpr *E); 124193326Sed void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) { 125193326Sed Visit(DAE->getExpr()); 126193326Sed } 127193326Sed void VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E); 128193326Sed void VisitCXXConstructExpr(const CXXConstructExpr *E); 129193326Sed void VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E); 130198398Srdivacky void VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E); 131199482Srdivacky void VisitCXXTypeidExpr(CXXTypeidExpr *E) { EmitAggLoadOfLValue(E); } 132193326Sed 133193326Sed void VisitVAArgExpr(VAArgExpr *E); 134193326Sed 135203955Srdivacky void EmitInitializationToLValue(Expr *E, LValue Address, QualType T); 136193326Sed void EmitNullInitializationToLValue(LValue Address, QualType T); 137193326Sed // case Expr::ChooseExprClass: 138200583Srdivacky void VisitCXXThrowExpr(const CXXThrowExpr *E) { CGF.EmitCXXThrowExpr(E); } 139193326Sed}; 140193326Sed} // end anonymous namespace. 141193326Sed 142193326Sed//===----------------------------------------------------------------------===// 143193326Sed// Utilities 144193326Sed//===----------------------------------------------------------------------===// 145193326Sed 146193326Sed/// EmitAggLoadOfLValue - Given an expression with aggregate type that 147193326Sed/// represents a value lvalue, this method emits the address of the lvalue, 148193326Sed/// then loads the result into DestPtr. 149193326Sedvoid AggExprEmitter::EmitAggLoadOfLValue(const Expr *E) { 150193326Sed LValue LV = CGF.EmitLValue(E); 151193326Sed EmitFinalDestCopy(E, LV); 152193326Sed} 153193326Sed 154208600Srdivacky/// \brief True if the given aggregate type requires special GC API calls. 155208600Srdivackybool AggExprEmitter::TypeRequiresGCollection(QualType T) { 156208600Srdivacky // Only record types have members that might require garbage collection. 157208600Srdivacky const RecordType *RecordTy = T->getAs<RecordType>(); 158208600Srdivacky if (!RecordTy) return false; 159208600Srdivacky 160208600Srdivacky // Don't mess with non-trivial C++ types. 161208600Srdivacky RecordDecl *Record = RecordTy->getDecl(); 162208600Srdivacky if (isa<CXXRecordDecl>(Record) && 163208600Srdivacky (!cast<CXXRecordDecl>(Record)->hasTrivialCopyConstructor() || 164208600Srdivacky !cast<CXXRecordDecl>(Record)->hasTrivialDestructor())) 165208600Srdivacky return false; 166208600Srdivacky 167208600Srdivacky // Check whether the type has an object member. 168208600Srdivacky return Record->hasObjectMember(); 169208600Srdivacky} 170208600Srdivacky 171208600Srdivacky/// \brief Perform the final move to DestPtr if RequiresGCollection is set. 172208600Srdivacky/// 173208600Srdivacky/// The idea is that you do something like this: 174208600Srdivacky/// RValue Result = EmitSomething(..., getReturnValueSlot()); 175208600Srdivacky/// EmitGCMove(E, Result); 176208600Srdivacky/// If GC doesn't interfere, this will cause the result to be emitted 177208600Srdivacky/// directly into the return value slot. If GC does interfere, a final 178208600Srdivacky/// move will be performed. 179208600Srdivackyvoid AggExprEmitter::EmitGCMove(const Expr *E, RValue Src) { 180208600Srdivacky if (!RequiresGCollection) return; 181208600Srdivacky 182208600Srdivacky CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, DestPtr, 183208600Srdivacky Src.getAggregateAddr(), 184208600Srdivacky E->getType()); 185208600Srdivacky} 186208600Srdivacky 187193326Sed/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 188193326Sedvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, RValue Src, bool Ignore) { 189193326Sed assert(Src.isAggregate() && "value must be aggregate value!"); 190193326Sed 191193326Sed // If the result is ignored, don't copy from the value. 192193326Sed if (DestPtr == 0) { 193193326Sed if (!Src.isVolatileQualified() || (IgnoreResult && Ignore)) 194193326Sed return; 195193326Sed // If the source is volatile, we must read from it; to do that, we need 196193326Sed // some place to put it. 197203955Srdivacky DestPtr = CGF.CreateMemTemp(E->getType(), "agg.tmp"); 198193326Sed } 199193326Sed 200198092Srdivacky if (RequiresGCollection) { 201198092Srdivacky CGF.CGM.getObjCRuntime().EmitGCMemmoveCollectable(CGF, 202198092Srdivacky DestPtr, Src.getAggregateAddr(), 203198092Srdivacky E->getType()); 204198092Srdivacky return; 205198092Srdivacky } 206193326Sed // If the result of the assignment is used, copy the LHS there also. 207193326Sed // FIXME: Pass VolatileDest as well. I think we also need to merge volatile 208193326Sed // from the source as well, as we can't eliminate it if either operand 209193326Sed // is volatile, unless copy has volatile for both source and destination.. 210193326Sed CGF.EmitAggregateCopy(DestPtr, Src.getAggregateAddr(), E->getType(), 211193326Sed VolatileDest|Src.isVolatileQualified()); 212193326Sed} 213193326Sed 214193326Sed/// EmitFinalDestCopy - Perform the final copy to DestPtr, if desired. 215193326Sedvoid AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) { 216193326Sed assert(Src.isSimple() && "Can't have aggregate bitfield, vector, etc"); 217193326Sed 218193326Sed EmitFinalDestCopy(E, RValue::getAggregate(Src.getAddress(), 219193326Sed Src.isVolatileQualified()), 220193326Sed Ignore); 221193326Sed} 222193326Sed 223193326Sed//===----------------------------------------------------------------------===// 224193326Sed// Visitor Methods 225193326Sed//===----------------------------------------------------------------------===// 226193326Sed 227198092Srdivackyvoid AggExprEmitter::VisitCastExpr(CastExpr *E) { 228208600Srdivacky if (!DestPtr && E->getCastKind() != CastExpr::CK_Dynamic) { 229204962Srdivacky Visit(E->getSubExpr()); 230204962Srdivacky return; 231204962Srdivacky } 232204962Srdivacky 233198092Srdivacky switch (E->getCastKind()) { 234198092Srdivacky default: assert(0 && "Unhandled cast kind!"); 235198092Srdivacky 236208600Srdivacky case CastExpr::CK_Dynamic: { 237208600Srdivacky assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?"); 238208600Srdivacky LValue LV = CGF.EmitCheckedLValue(E->getSubExpr()); 239208600Srdivacky // FIXME: Do we also need to handle property references here? 240208600Srdivacky if (LV.isSimple()) 241208600Srdivacky CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E)); 242208600Srdivacky else 243208600Srdivacky CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast"); 244208600Srdivacky 245208600Srdivacky if (DestPtr) 246208600Srdivacky CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination"); 247208600Srdivacky break; 248208600Srdivacky } 249208600Srdivacky 250198092Srdivacky case CastExpr::CK_ToUnion: { 251198092Srdivacky // GCC union extension 252193401Sed QualType PtrTy = 253198092Srdivacky CGF.getContext().getPointerType(E->getSubExpr()->getType()); 254193401Sed llvm::Value *CastPtr = Builder.CreateBitCast(DestPtr, 255193401Sed CGF.ConvertType(PtrTy)); 256198092Srdivacky EmitInitializationToLValue(E->getSubExpr(), 257203955Srdivacky LValue::MakeAddr(CastPtr, Qualifiers()), 258204643Srdivacky E->getSubExpr()->getType()); 259198092Srdivacky break; 260193326Sed } 261193326Sed 262208600Srdivacky case CastExpr::CK_DerivedToBase: 263208600Srdivacky case CastExpr::CK_BaseToDerived: 264208600Srdivacky case CastExpr::CK_UncheckedDerivedToBase: { 265208600Srdivacky assert(0 && "cannot perform hierarchy conversion in EmitAggExpr: " 266208600Srdivacky "should have been unpacked before we got here"); 267208600Srdivacky break; 268208600Srdivacky } 269208600Srdivacky 270198092Srdivacky // FIXME: Remove the CK_Unknown check here. 271198092Srdivacky case CastExpr::CK_Unknown: 272198092Srdivacky case CastExpr::CK_NoOp: 273198092Srdivacky case CastExpr::CK_UserDefinedConversion: 274198092Srdivacky case CastExpr::CK_ConstructorConversion: 275198092Srdivacky assert(CGF.getContext().hasSameUnqualifiedType(E->getSubExpr()->getType(), 276198092Srdivacky E->getType()) && 277198092Srdivacky "Implicit cast types must be compatible"); 278198092Srdivacky Visit(E->getSubExpr()); 279198092Srdivacky break; 280193326Sed 281198092Srdivacky case CastExpr::CK_NullToMemberPointer: { 282204962Srdivacky // If the subexpression's type is the C++0x nullptr_t, emit the 283204962Srdivacky // subexpression, which may have side effects. 284204962Srdivacky if (E->getSubExpr()->getType()->isNullPtrType()) 285204962Srdivacky Visit(E->getSubExpr()); 286204962Srdivacky 287198092Srdivacky const llvm::Type *PtrDiffTy = 288198092Srdivacky CGF.ConvertType(CGF.getContext().getPointerDiffType()); 289198092Srdivacky 290198092Srdivacky llvm::Value *NullValue = llvm::Constant::getNullValue(PtrDiffTy); 291198092Srdivacky llvm::Value *Ptr = Builder.CreateStructGEP(DestPtr, 0, "ptr"); 292198092Srdivacky Builder.CreateStore(NullValue, Ptr, VolatileDest); 293198092Srdivacky 294198092Srdivacky llvm::Value *Adj = Builder.CreateStructGEP(DestPtr, 1, "adj"); 295198092Srdivacky Builder.CreateStore(NullValue, Adj, VolatileDest); 296198092Srdivacky 297198092Srdivacky break; 298198092Srdivacky } 299198092Srdivacky 300198398Srdivacky case CastExpr::CK_BitCast: { 301198398Srdivacky // This must be a member function pointer cast. 302198398Srdivacky Visit(E->getSubExpr()); 303198398Srdivacky break; 304198398Srdivacky } 305198398Srdivacky 306199990Srdivacky case CastExpr::CK_DerivedToBaseMemberPointer: 307198092Srdivacky case CastExpr::CK_BaseToDerivedMemberPointer: { 308198092Srdivacky QualType SrcType = E->getSubExpr()->getType(); 309198092Srdivacky 310203955Srdivacky llvm::Value *Src = CGF.CreateMemTemp(SrcType, "tmp"); 311198092Srdivacky CGF.EmitAggExpr(E->getSubExpr(), Src, SrcType.isVolatileQualified()); 312198092Srdivacky 313198092Srdivacky llvm::Value *SrcPtr = Builder.CreateStructGEP(Src, 0, "src.ptr"); 314198092Srdivacky SrcPtr = Builder.CreateLoad(SrcPtr); 315198092Srdivacky 316198092Srdivacky llvm::Value *SrcAdj = Builder.CreateStructGEP(Src, 1, "src.adj"); 317198092Srdivacky SrcAdj = Builder.CreateLoad(SrcAdj); 318198092Srdivacky 319198092Srdivacky llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 320198092Srdivacky Builder.CreateStore(SrcPtr, DstPtr, VolatileDest); 321198092Srdivacky 322198092Srdivacky llvm::Value *DstAdj = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 323198092Srdivacky 324198092Srdivacky // Now See if we need to update the adjustment. 325199990Srdivacky const CXXRecordDecl *BaseDecl = 326198092Srdivacky cast<CXXRecordDecl>(SrcType->getAs<MemberPointerType>()-> 327198092Srdivacky getClass()->getAs<RecordType>()->getDecl()); 328199990Srdivacky const CXXRecordDecl *DerivedDecl = 329198092Srdivacky cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()-> 330198092Srdivacky getClass()->getAs<RecordType>()->getDecl()); 331199990Srdivacky if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 332199990Srdivacky std::swap(DerivedDecl, BaseDecl); 333199990Srdivacky 334203955Srdivacky if (llvm::Constant *Adj = 335207619Srdivacky CGF.CGM.GetNonVirtualBaseClassOffset(DerivedDecl, E->getBasePath())) { 336199990Srdivacky if (E->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer) 337199990Srdivacky SrcAdj = Builder.CreateSub(SrcAdj, Adj, "adj"); 338199990Srdivacky else 339199990Srdivacky SrcAdj = Builder.CreateAdd(SrcAdj, Adj, "adj"); 340199990Srdivacky } 341198092Srdivacky 342198092Srdivacky Builder.CreateStore(SrcAdj, DstAdj, VolatileDest); 343198092Srdivacky break; 344198092Srdivacky } 345198092Srdivacky } 346193326Sed} 347193326Sed 348193326Sedvoid AggExprEmitter::VisitCallExpr(const CallExpr *E) { 349193326Sed if (E->getCallReturnType()->isReferenceType()) { 350193326Sed EmitAggLoadOfLValue(E); 351193326Sed return; 352193326Sed } 353198092Srdivacky 354208600Srdivacky RValue RV = CGF.EmitCallExpr(E, getReturnValueSlot()); 355208600Srdivacky EmitGCMove(E, RV); 356193326Sed} 357193326Sed 358193326Sedvoid AggExprEmitter::VisitObjCMessageExpr(ObjCMessageExpr *E) { 359208600Srdivacky RValue RV = CGF.EmitObjCMessageExpr(E, getReturnValueSlot()); 360208600Srdivacky EmitGCMove(E, RV); 361193326Sed} 362193326Sed 363193326Sedvoid AggExprEmitter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) { 364208600Srdivacky RValue RV = CGF.EmitObjCPropertyGet(E, getReturnValueSlot()); 365208600Srdivacky EmitGCMove(E, RV); 366193326Sed} 367193326Sed 368198092Srdivackyvoid AggExprEmitter::VisitObjCImplicitSetterGetterRefExpr( 369198092Srdivacky ObjCImplicitSetterGetterRefExpr *E) { 370208600Srdivacky RValue RV = CGF.EmitObjCPropertyGet(E, getReturnValueSlot()); 371208600Srdivacky EmitGCMove(E, RV); 372193326Sed} 373193326Sed 374193326Sedvoid AggExprEmitter::VisitBinComma(const BinaryOperator *E) { 375193326Sed CGF.EmitAnyExpr(E->getLHS(), 0, false, true); 376198092Srdivacky CGF.EmitAggExpr(E->getRHS(), DestPtr, VolatileDest, 377198092Srdivacky /*IgnoreResult=*/false, IsInitializer); 378193326Sed} 379193326Sed 380198092Srdivackyvoid AggExprEmitter::VisitUnaryAddrOf(const UnaryOperator *E) { 381198092Srdivacky // We have a member function pointer. 382198092Srdivacky const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>(); 383198398Srdivacky (void) MPT; 384198092Srdivacky assert(MPT->getPointeeType()->isFunctionProtoType() && 385198092Srdivacky "Unexpected member pointer type!"); 386207619Srdivacky 387207619Srdivacky // The creation of member function pointers has no side effects; if 388207619Srdivacky // there is no destination pointer, we have nothing to do. 389207619Srdivacky if (!DestPtr) 390207619Srdivacky return; 391198092Srdivacky 392198893Srdivacky const DeclRefExpr *DRE = cast<DeclRefExpr>(E->getSubExpr()); 393202379Srdivacky const CXXMethodDecl *MD = 394202379Srdivacky cast<CXXMethodDecl>(DRE->getDecl())->getCanonicalDecl(); 395198092Srdivacky 396198092Srdivacky const llvm::Type *PtrDiffTy = 397198092Srdivacky CGF.ConvertType(CGF.getContext().getPointerDiffType()); 398198092Srdivacky 399207619Srdivacky 400198092Srdivacky llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr"); 401198092Srdivacky llvm::Value *FuncPtr; 402198092Srdivacky 403198092Srdivacky if (MD->isVirtual()) { 404207619Srdivacky int64_t Index = CGF.CGM.getVTables().getMethodVTableIndex(MD); 405198092Srdivacky 406207619Srdivacky // FIXME: We shouldn't use / 8 here. 407207619Srdivacky uint64_t PointerWidthInBytes = 408207619Srdivacky CGF.CGM.getContext().Target.getPointerWidth(0) / 8; 409207619Srdivacky 410203955Srdivacky // Itanium C++ ABI 2.3: 411203955Srdivacky // For a non-virtual function, this field is a simple function pointer. 412203955Srdivacky // For a virtual function, it is 1 plus the virtual table offset 413203955Srdivacky // (in bytes) of the function, represented as a ptrdiff_t. 414207619Srdivacky FuncPtr = llvm::ConstantInt::get(PtrDiffTy, 415207619Srdivacky (Index * PointerWidthInBytes) + 1); 416198092Srdivacky } else { 417203955Srdivacky const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); 418203955Srdivacky const llvm::Type *Ty = 419203955Srdivacky CGF.CGM.getTypes().GetFunctionType(CGF.CGM.getTypes().getFunctionInfo(MD), 420203955Srdivacky FPT->isVariadic()); 421203955Srdivacky llvm::Constant *Fn = CGF.CGM.GetAddrOfFunction(MD, Ty); 422203955Srdivacky FuncPtr = llvm::ConstantExpr::getPtrToInt(Fn, PtrDiffTy); 423198092Srdivacky } 424198092Srdivacky Builder.CreateStore(FuncPtr, DstPtr, VolatileDest); 425198092Srdivacky 426198092Srdivacky llvm::Value *AdjPtr = Builder.CreateStructGEP(DestPtr, 1, "dst.adj"); 427198092Srdivacky 428198092Srdivacky // The adjustment will always be 0. 429198092Srdivacky Builder.CreateStore(llvm::ConstantInt::get(PtrDiffTy, 0), AdjPtr, 430198092Srdivacky VolatileDest); 431198092Srdivacky} 432198092Srdivacky 433193326Sedvoid AggExprEmitter::VisitStmtExpr(const StmtExpr *E) { 434193326Sed CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest); 435193326Sed} 436193326Sed 437193326Sedvoid AggExprEmitter::VisitBinaryOperator(const BinaryOperator *E) { 438198893Srdivacky if (E->getOpcode() == BinaryOperator::PtrMemD || 439198893Srdivacky E->getOpcode() == BinaryOperator::PtrMemI) 440198398Srdivacky VisitPointerToDataMemberBinaryOperator(E); 441198398Srdivacky else 442198398Srdivacky CGF.ErrorUnsupported(E, "aggregate binary expression"); 443193326Sed} 444193326Sed 445198398Srdivackyvoid AggExprEmitter::VisitPointerToDataMemberBinaryOperator( 446198398Srdivacky const BinaryOperator *E) { 447198398Srdivacky LValue LV = CGF.EmitPointerToDataMemberBinaryExpr(E); 448198398Srdivacky EmitFinalDestCopy(E, LV); 449198398Srdivacky} 450198398Srdivacky 451193326Sedvoid AggExprEmitter::VisitBinAssign(const BinaryOperator *E) { 452193326Sed // For an assignment to work, the value on the right has 453193326Sed // to be compatible with the value on the left. 454193326Sed assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(), 455193326Sed E->getRHS()->getType()) 456193326Sed && "Invalid assignment"); 457193326Sed LValue LHS = CGF.EmitLValue(E->getLHS()); 458193326Sed 459193326Sed // We have to special case property setters, otherwise we must have 460193326Sed // a simple lvalue (no aggregates inside vectors, bitfields). 461193326Sed if (LHS.isPropertyRef()) { 462193326Sed llvm::Value *AggLoc = DestPtr; 463193326Sed if (!AggLoc) 464203955Srdivacky AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 465193326Sed CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 466198092Srdivacky CGF.EmitObjCPropertySet(LHS.getPropertyRefExpr(), 467193326Sed RValue::getAggregate(AggLoc, VolatileDest)); 468198092Srdivacky } else if (LHS.isKVCRef()) { 469193326Sed llvm::Value *AggLoc = DestPtr; 470193326Sed if (!AggLoc) 471203955Srdivacky AggLoc = CGF.CreateMemTemp(E->getRHS()->getType()); 472193326Sed CGF.EmitAggExpr(E->getRHS(), AggLoc, VolatileDest); 473198092Srdivacky CGF.EmitObjCPropertySet(LHS.getKVCRefExpr(), 474193326Sed RValue::getAggregate(AggLoc, VolatileDest)); 475193326Sed } else { 476198092Srdivacky bool RequiresGCollection = false; 477208600Srdivacky if (CGF.getContext().getLangOptions().getGCMode()) 478208600Srdivacky RequiresGCollection = TypeRequiresGCollection(E->getLHS()->getType()); 479208600Srdivacky 480193326Sed // Codegen the RHS so that it stores directly into the LHS. 481198092Srdivacky CGF.EmitAggExpr(E->getRHS(), LHS.getAddress(), LHS.isVolatileQualified(), 482198092Srdivacky false, false, RequiresGCollection); 483193326Sed EmitFinalDestCopy(E, LHS, true); 484193326Sed } 485193326Sed} 486193326Sed 487193326Sedvoid AggExprEmitter::VisitConditionalOperator(const ConditionalOperator *E) { 488201361Srdivacky if (!E->getLHS()) { 489201361Srdivacky CGF.ErrorUnsupported(E, "conditional operator with missing LHS"); 490201361Srdivacky return; 491201361Srdivacky } 492201361Srdivacky 493193326Sed llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true"); 494193326Sed llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false"); 495193326Sed llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end"); 496198092Srdivacky 497201361Srdivacky CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock); 498198092Srdivacky 499203955Srdivacky CGF.BeginConditionalBranch(); 500193326Sed CGF.EmitBlock(LHSBlock); 501198092Srdivacky 502193326Sed // Handle the GNU extension for missing LHS. 503193326Sed assert(E->getLHS() && "Must have LHS for aggregate value"); 504193326Sed 505193326Sed Visit(E->getLHS()); 506203955Srdivacky CGF.EndConditionalBranch(); 507193326Sed CGF.EmitBranch(ContBlock); 508198092Srdivacky 509203955Srdivacky CGF.BeginConditionalBranch(); 510193326Sed CGF.EmitBlock(RHSBlock); 511198092Srdivacky 512193326Sed Visit(E->getRHS()); 513203955Srdivacky CGF.EndConditionalBranch(); 514193326Sed CGF.EmitBranch(ContBlock); 515198092Srdivacky 516193326Sed CGF.EmitBlock(ContBlock); 517193326Sed} 518193326Sed 519198092Srdivackyvoid AggExprEmitter::VisitChooseExpr(const ChooseExpr *CE) { 520198092Srdivacky Visit(CE->getChosenSubExpr(CGF.getContext())); 521198092Srdivacky} 522198092Srdivacky 523193326Sedvoid AggExprEmitter::VisitVAArgExpr(VAArgExpr *VE) { 524193326Sed llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr()); 525193326Sed llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType()); 526193326Sed 527193326Sed if (!ArgPtr) { 528193326Sed CGF.ErrorUnsupported(VE, "aggregate va_arg expression"); 529193326Sed return; 530193326Sed } 531193326Sed 532198092Srdivacky EmitFinalDestCopy(VE, LValue::MakeAddr(ArgPtr, Qualifiers())); 533193326Sed} 534193326Sed 535193326Sedvoid AggExprEmitter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) { 536193326Sed llvm::Value *Val = DestPtr; 537198092Srdivacky 538193326Sed if (!Val) { 539193326Sed // Create a temporary variable. 540203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 541193326Sed 542193326Sed // FIXME: volatile 543193326Sed CGF.EmitAggExpr(E->getSubExpr(), Val, false); 544198092Srdivacky } else 545193326Sed Visit(E->getSubExpr()); 546198092Srdivacky 547198092Srdivacky // Don't make this a live temporary if we're emitting an initializer expr. 548198092Srdivacky if (!IsInitializer) 549198092Srdivacky CGF.PushCXXTemporary(E->getTemporary(), Val); 550193326Sed} 551193326Sed 552193326Sedvoid 553193326SedAggExprEmitter::VisitCXXConstructExpr(const CXXConstructExpr *E) { 554193326Sed llvm::Value *Val = DestPtr; 555198092Srdivacky 556193326Sed if (!Val) { 557193326Sed // Create a temporary variable. 558203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 559193326Sed } 560193326Sed 561201361Srdivacky if (E->requiresZeroInitialization()) 562201361Srdivacky EmitNullInitializationToLValue(LValue::MakeAddr(Val, 563201361Srdivacky // FIXME: Qualifiers()? 564201361Srdivacky E->getType().getQualifiers()), 565201361Srdivacky E->getType()); 566201361Srdivacky 567193326Sed CGF.EmitCXXConstructExpr(Val, E); 568193326Sed} 569193326Sed 570193326Sedvoid AggExprEmitter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) { 571201361Srdivacky llvm::Value *Val = DestPtr; 572201361Srdivacky 573201361Srdivacky CGF.EmitCXXExprWithTemporaries(E, Val, VolatileDest, IsInitializer); 574193326Sed} 575193326Sed 576198398Srdivackyvoid AggExprEmitter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *E) { 577201361Srdivacky llvm::Value *Val = DestPtr; 578201361Srdivacky 579201361Srdivacky if (!Val) { 580201361Srdivacky // Create a temporary variable. 581203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 582201361Srdivacky } 583201361Srdivacky LValue LV = LValue::MakeAddr(Val, Qualifiers()); 584201361Srdivacky EmitNullInitializationToLValue(LV, E->getType()); 585198398Srdivacky} 586198398Srdivacky 587201361Srdivackyvoid AggExprEmitter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) { 588201361Srdivacky llvm::Value *Val = DestPtr; 589201361Srdivacky 590201361Srdivacky if (!Val) { 591201361Srdivacky // Create a temporary variable. 592203955Srdivacky Val = CGF.CreateMemTemp(E->getType(), "tmp"); 593201361Srdivacky } 594201361Srdivacky LValue LV = LValue::MakeAddr(Val, Qualifiers()); 595201361Srdivacky EmitNullInitializationToLValue(LV, E->getType()); 596201361Srdivacky} 597201361Srdivacky 598203955Srdivackyvoid 599203955SrdivackyAggExprEmitter::EmitInitializationToLValue(Expr* E, LValue LV, QualType T) { 600193326Sed // FIXME: Ignore result? 601193326Sed // FIXME: Are initializers affected by volatile? 602193326Sed if (isa<ImplicitValueInitExpr>(E)) { 603203955Srdivacky EmitNullInitializationToLValue(LV, T); 604203955Srdivacky } else if (T->isReferenceType()) { 605203955Srdivacky RValue RV = CGF.EmitReferenceBindingToExpr(E, /*IsInitializer=*/false); 606203955Srdivacky CGF.EmitStoreThroughLValue(RV, LV, T); 607203955Srdivacky } else if (T->isAnyComplexType()) { 608193326Sed CGF.EmitComplexExprIntoAddr(E, LV.getAddress(), false); 609203955Srdivacky } else if (CGF.hasAggregateLLVMType(T)) { 610193326Sed CGF.EmitAnyExpr(E, LV.getAddress(), false); 611193326Sed } else { 612203955Srdivacky CGF.EmitStoreThroughLValue(CGF.EmitAnyExpr(E), LV, T); 613193326Sed } 614193326Sed} 615193326Sed 616193326Sedvoid AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) { 617193326Sed if (!CGF.hasAggregateLLVMType(T)) { 618193326Sed // For non-aggregates, we can store zero 619193326Sed llvm::Value *Null = llvm::Constant::getNullValue(CGF.ConvertType(T)); 620193326Sed CGF.EmitStoreThroughLValue(RValue::get(Null), LV, T); 621193326Sed } else { 622193326Sed // There's a potential optimization opportunity in combining 623193326Sed // memsets; that would be easy for arrays, but relatively 624193326Sed // difficult for structures with the current code. 625208600Srdivacky CGF.EmitNullInitialization(LV.getAddress(), T); 626193326Sed } 627193326Sed} 628193326Sed 629193326Sedvoid AggExprEmitter::VisitInitListExpr(InitListExpr *E) { 630193326Sed#if 0 631200583Srdivacky // FIXME: Assess perf here? Figure out what cases are worth optimizing here 632200583Srdivacky // (Length of globals? Chunks of zeroed-out space?). 633193326Sed // 634193326Sed // If we can, prefer a copy from a global; this is a lot less code for long 635193326Sed // globals, and it's easier for the current optimizers to analyze. 636200583Srdivacky if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) { 637193326Sed llvm::GlobalVariable* GV = 638200583Srdivacky new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true, 639200583Srdivacky llvm::GlobalValue::InternalLinkage, C, ""); 640200583Srdivacky EmitFinalDestCopy(E, LValue::MakeAddr(GV, Qualifiers())); 641193326Sed return; 642193326Sed } 643193326Sed#endif 644193326Sed if (E->hadArrayRangeDesignator()) { 645193326Sed CGF.ErrorUnsupported(E, "GNU array range designator extension"); 646193326Sed } 647193326Sed 648193326Sed // Handle initialization of an array. 649193326Sed if (E->getType()->isArrayType()) { 650193326Sed const llvm::PointerType *APType = 651193326Sed cast<llvm::PointerType>(DestPtr->getType()); 652193326Sed const llvm::ArrayType *AType = 653193326Sed cast<llvm::ArrayType>(APType->getElementType()); 654198092Srdivacky 655193326Sed uint64_t NumInitElements = E->getNumInits(); 656193326Sed 657193326Sed if (E->getNumInits() > 0) { 658193326Sed QualType T1 = E->getType(); 659193326Sed QualType T2 = E->getInit(0)->getType(); 660193326Sed if (CGF.getContext().hasSameUnqualifiedType(T1, T2)) { 661193326Sed EmitAggLoadOfLValue(E->getInit(0)); 662193326Sed return; 663193326Sed } 664193326Sed } 665193326Sed 666193326Sed uint64_t NumArrayElements = AType->getNumElements(); 667193326Sed QualType ElementType = CGF.getContext().getCanonicalType(E->getType()); 668193326Sed ElementType = CGF.getContext().getAsArrayType(ElementType)->getElementType(); 669193326Sed 670198092Srdivacky // FIXME: were we intentionally ignoring address spaces and GC attributes? 671198092Srdivacky Qualifiers Quals = CGF.MakeQualifiers(ElementType); 672198092Srdivacky 673193326Sed for (uint64_t i = 0; i != NumArrayElements; ++i) { 674193326Sed llvm::Value *NextVal = Builder.CreateStructGEP(DestPtr, i, ".array"); 675193326Sed if (i < NumInitElements) 676193326Sed EmitInitializationToLValue(E->getInit(i), 677203955Srdivacky LValue::MakeAddr(NextVal, Quals), 678203955Srdivacky ElementType); 679193326Sed else 680198092Srdivacky EmitNullInitializationToLValue(LValue::MakeAddr(NextVal, Quals), 681193326Sed ElementType); 682193326Sed } 683193326Sed return; 684193326Sed } 685198092Srdivacky 686193326Sed assert(E->getType()->isRecordType() && "Only support structs/unions here!"); 687198092Srdivacky 688193326Sed // Do struct initialization; this code just sets each individual member 689193326Sed // to the approprate value. This makes bitfield support automatic; 690193326Sed // the disadvantage is that the generated code is more difficult for 691193326Sed // the optimizer, especially with bitfields. 692193326Sed unsigned NumInitElements = E->getNumInits(); 693198092Srdivacky RecordDecl *SD = E->getType()->getAs<RecordType>()->getDecl(); 694193326Sed unsigned CurInitVal = 0; 695193326Sed 696193326Sed if (E->getType()->isUnionType()) { 697193326Sed // Only initialize one field of a union. The field itself is 698193326Sed // specified by the initializer list. 699193326Sed if (!E->getInitializedFieldInUnion()) { 700193326Sed // Empty union; we have nothing to do. 701198092Srdivacky 702193326Sed#ifndef NDEBUG 703193326Sed // Make sure that it's really an empty and not a failure of 704193326Sed // semantic analysis. 705195341Sed for (RecordDecl::field_iterator Field = SD->field_begin(), 706195341Sed FieldEnd = SD->field_end(); 707193326Sed Field != FieldEnd; ++Field) 708193326Sed assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"); 709193326Sed#endif 710193326Sed return; 711193326Sed } 712193326Sed 713193326Sed // FIXME: volatility 714193326Sed FieldDecl *Field = E->getInitializedFieldInUnion(); 715203955Srdivacky LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, Field, 0); 716193326Sed 717193326Sed if (NumInitElements) { 718193326Sed // Store the initializer into the field 719203955Srdivacky EmitInitializationToLValue(E->getInit(0), FieldLoc, Field->getType()); 720193326Sed } else { 721193326Sed // Default-initialize to null 722193326Sed EmitNullInitializationToLValue(FieldLoc, Field->getType()); 723193326Sed } 724193326Sed 725193326Sed return; 726193326Sed } 727204962Srdivacky 728204962Srdivacky // If we're initializing the whole aggregate, just do it in place. 729204962Srdivacky // FIXME: This is a hack around an AST bug (PR6537). 730204962Srdivacky if (NumInitElements == 1 && E->getType() == E->getInit(0)->getType()) { 731204962Srdivacky EmitInitializationToLValue(E->getInit(0), 732204962Srdivacky LValue::MakeAddr(DestPtr, Qualifiers()), 733204962Srdivacky E->getType()); 734204962Srdivacky return; 735204962Srdivacky } 736204962Srdivacky 737198092Srdivacky 738193326Sed // Here we iterate over the fields; this makes it simpler to both 739193326Sed // default-initialize fields and skip over unnamed fields. 740195341Sed for (RecordDecl::field_iterator Field = SD->field_begin(), 741195341Sed FieldEnd = SD->field_end(); 742193326Sed Field != FieldEnd; ++Field) { 743193326Sed // We're done once we hit the flexible array member 744193326Sed if (Field->getType()->isIncompleteArrayType()) 745193326Sed break; 746193326Sed 747193326Sed if (Field->isUnnamedBitfield()) 748193326Sed continue; 749193326Sed 750193326Sed // FIXME: volatility 751203955Srdivacky LValue FieldLoc = CGF.EmitLValueForFieldInitialization(DestPtr, *Field, 0); 752193326Sed // We never generate write-barries for initialized fields. 753193326Sed LValue::SetObjCNonGC(FieldLoc, true); 754193326Sed if (CurInitVal < NumInitElements) { 755204962Srdivacky // Store the initializer into the field. 756204962Srdivacky EmitInitializationToLValue(E->getInit(CurInitVal++), FieldLoc, 757203955Srdivacky Field->getType()); 758193326Sed } else { 759193326Sed // We're out of initalizers; default-initialize to null 760193326Sed EmitNullInitializationToLValue(FieldLoc, Field->getType()); 761193326Sed } 762193326Sed } 763193326Sed} 764193326Sed 765193326Sed//===----------------------------------------------------------------------===// 766193326Sed// Entry Points into this File 767193326Sed//===----------------------------------------------------------------------===// 768193326Sed 769193326Sed/// EmitAggExpr - Emit the computation of the specified expression of aggregate 770193326Sed/// type. The result is computed into DestPtr. Note that if DestPtr is null, 771193326Sed/// the value of the aggregate expression is not needed. If VolatileDest is 772193326Sed/// true, DestPtr cannot be 0. 773203955Srdivacky// 774203955Srdivacky// FIXME: Take Qualifiers object. 775193326Sedvoid CodeGenFunction::EmitAggExpr(const Expr *E, llvm::Value *DestPtr, 776198092Srdivacky bool VolatileDest, bool IgnoreResult, 777198092Srdivacky bool IsInitializer, 778198092Srdivacky bool RequiresGCollection) { 779193326Sed assert(E && hasAggregateLLVMType(E->getType()) && 780193326Sed "Invalid aggregate expression to emit"); 781193326Sed assert ((DestPtr != 0 || VolatileDest == false) 782193326Sed && "volatile aggregate can't be 0"); 783198092Srdivacky 784198092Srdivacky AggExprEmitter(*this, DestPtr, VolatileDest, IgnoreResult, IsInitializer, 785198092Srdivacky RequiresGCollection) 786193326Sed .Visit(const_cast<Expr*>(E)); 787193326Sed} 788193326Sed 789203955SrdivackyLValue CodeGenFunction::EmitAggExprToLValue(const Expr *E) { 790203955Srdivacky assert(hasAggregateLLVMType(E->getType()) && "Invalid argument!"); 791203955Srdivacky Qualifiers Q = MakeQualifiers(E->getType()); 792203955Srdivacky llvm::Value *Temp = CreateMemTemp(E->getType()); 793203955Srdivacky EmitAggExpr(E, Temp, Q.hasVolatile()); 794203955Srdivacky return LValue::MakeAddr(Temp, Q); 795203955Srdivacky} 796203955Srdivacky 797193326Sedvoid CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr, 798193326Sed llvm::Value *SrcPtr, QualType Ty, 799193326Sed bool isVolatile) { 800193326Sed assert(!Ty->isAnyComplexType() && "Shouldn't happen for complex"); 801198092Srdivacky 802207619Srdivacky if (getContext().getLangOptions().CPlusPlus) { 803207619Srdivacky if (const RecordType *RT = Ty->getAs<RecordType>()) { 804208600Srdivacky CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl()); 805208600Srdivacky assert((Record->hasTrivialCopyConstructor() || 806208600Srdivacky Record->hasTrivialCopyAssignment()) && 807208600Srdivacky "Trying to aggregate-copy a type without a trivial copy " 808208600Srdivacky "constructor or assignment operator"); 809208600Srdivacky // Ignore empty classes in C++. 810208600Srdivacky if (Record->isEmpty()) 811207619Srdivacky return; 812207619Srdivacky } 813207619Srdivacky } 814207619Srdivacky 815193326Sed // Aggregate assignment turns into llvm.memcpy. This is almost valid per 816193326Sed // C99 6.5.16.1p3, which states "If the value being stored in an object is 817193326Sed // read from another object that overlaps in anyway the storage of the first 818193326Sed // object, then the overlap shall be exact and the two objects shall have 819193326Sed // qualified or unqualified versions of a compatible type." 820193326Sed // 821193326Sed // memcpy is not defined if the source and destination pointers are exactly 822193326Sed // equal, but other compilers do this optimization, and almost every memcpy 823193326Sed // implementation handles this case safely. If there is a libc that does not 824193326Sed // safely handle this, we can add a target hook. 825198092Srdivacky const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext); 826193326Sed if (DestPtr->getType() != BP) 827193326Sed DestPtr = Builder.CreateBitCast(DestPtr, BP, "tmp"); 828193326Sed if (SrcPtr->getType() != BP) 829193326Sed SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); 830198092Srdivacky 831193326Sed // Get size and alignment info for this aggregate. 832193326Sed std::pair<uint64_t, unsigned> TypeInfo = getContext().getTypeInfo(Ty); 833198092Srdivacky 834193326Sed // FIXME: Handle variable sized types. 835198092Srdivacky const llvm::Type *IntPtr = 836198092Srdivacky llvm::IntegerType::get(VMContext, LLVMPointerWidth); 837198092Srdivacky 838193326Sed // FIXME: If we have a volatile struct, the optimizer can remove what might 839193326Sed // appear to be `extra' memory ops: 840193326Sed // 841193326Sed // volatile struct { int i; } a, b; 842193326Sed // 843193326Sed // int main() { 844193326Sed // a = b; 845193326Sed // a = b; 846193326Sed // } 847193326Sed // 848206275Srdivacky // we need to use a different call here. We use isVolatile to indicate when 849193326Sed // either the source or the destination is volatile. 850206275Srdivacky const llvm::Type *I1Ty = llvm::Type::getInt1Ty(VMContext); 851206275Srdivacky const llvm::Type *I8Ty = llvm::Type::getInt8Ty(VMContext); 852206275Srdivacky const llvm::Type *I32Ty = llvm::Type::getInt32Ty(VMContext); 853206275Srdivacky 854206275Srdivacky const llvm::PointerType *DPT = cast<llvm::PointerType>(DestPtr->getType()); 855206275Srdivacky const llvm::Type *DBP = llvm::PointerType::get(I8Ty, DPT->getAddressSpace()); 856206275Srdivacky if (DestPtr->getType() != DBP) 857206275Srdivacky DestPtr = Builder.CreateBitCast(DestPtr, DBP, "tmp"); 858206275Srdivacky 859206275Srdivacky const llvm::PointerType *SPT = cast<llvm::PointerType>(SrcPtr->getType()); 860206275Srdivacky const llvm::Type *SBP = llvm::PointerType::get(I8Ty, SPT->getAddressSpace()); 861206275Srdivacky if (SrcPtr->getType() != SBP) 862206275Srdivacky SrcPtr = Builder.CreateBitCast(SrcPtr, SBP, "tmp"); 863206275Srdivacky 864206275Srdivacky Builder.CreateCall5(CGM.getMemCpyFn(DestPtr->getType(), SrcPtr->getType(), 865206275Srdivacky IntPtr), 866193326Sed DestPtr, SrcPtr, 867193326Sed // TypeInfo.first describes size in bits. 868193326Sed llvm::ConstantInt::get(IntPtr, TypeInfo.first/8), 869206275Srdivacky llvm::ConstantInt::get(I32Ty, TypeInfo.second/8), 870206275Srdivacky llvm::ConstantInt::get(I1Ty, isVolatile)); 871193326Sed} 872