CGExpr.cpp revision 11893327d056a7ebd820da8f00a3286e7430a91c 
1//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
15#include "CodeGenModule.h"
16#include "CGCall.h"
17#include "CGCXXABI.h"
18#include "CGRecordLayout.h"
19#include "CGObjCRuntime.h"
20#include "clang/AST/ASTContext.h"
21#include "clang/AST/DeclObjC.h"
22#include "llvm/Intrinsics.h"
23#include "clang/Frontend/CodeGenOptions.h"
24#include "llvm/Target/TargetData.h"
25using namespace clang;
26using namespace CodeGen;
27
28//===--------------------------------------------------------------------===//
29//                        Miscellaneous Helper Methods
30//===--------------------------------------------------------------------===//
31
32/// CreateTempAlloca - This creates a alloca and inserts it into the entry
33/// block.
34llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(const llvm::Type *Ty,
35                                                    const llvm::Twine &Name) {
36  if (!Builder.isNamePreserving())
37    return new llvm::AllocaInst(Ty, 0, "", AllocaInsertPt);
38  return new llvm::AllocaInst(Ty, 0, Name, AllocaInsertPt);
39}
40
41void CodeGenFunction::InitTempAlloca(llvm::AllocaInst *Var,
42                                     llvm::Value *Init) {
43  llvm::StoreInst *Store = new llvm::StoreInst(Init, Var);
44  llvm::BasicBlock *Block = AllocaInsertPt->getParent();
45  Block->getInstList().insertAfter(&*AllocaInsertPt, Store);
46}
47
48llvm::AllocaInst *CodeGenFunction::CreateIRTemp(QualType Ty,
49                                                const llvm::Twine &Name) {
50  llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertType(Ty), Name);
51  // FIXME: Should we prefer the preferred type alignment here?
52  CharUnits Align = getContext().getTypeAlignInChars(Ty);
53  Alloc->setAlignment(Align.getQuantity());
54  return Alloc;
55}
56
57llvm::AllocaInst *CodeGenFunction::CreateMemTemp(QualType Ty,
58                                                 const llvm::Twine &Name) {
59  llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), Name);
60  // FIXME: Should we prefer the preferred type alignment here?
61  CharUnits Align = getContext().getTypeAlignInChars(Ty);
62  Alloc->setAlignment(Align.getQuantity());
63  return Alloc;
64}
65
66/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
67/// expression and compare the result against zero, returning an Int1Ty value.
68llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
69  if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
70    llvm::Value *MemPtr = EmitScalarExpr(E);
71    return CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
72  }
73
74  QualType BoolTy = getContext().BoolTy;
75  if (!E->getType()->isAnyComplexType())
76    return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy);
77
78  return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(),BoolTy);
79}
80
81/// EmitAnyExpr - Emit code to compute the specified expression which
82/// can have any type.  The result is returned as an RValue struct.
83/// If this is an aggregate expression, AggSlot indicates where the
84/// result should be returned.
85RValue CodeGenFunction::EmitAnyExpr(const Expr *E, AggValueSlot AggSlot,
86                                    bool IgnoreResult) {
87  if (!hasAggregateLLVMType(E->getType()))
88    return RValue::get(EmitScalarExpr(E, IgnoreResult));
89  else if (E->getType()->isAnyComplexType())
90    return RValue::getComplex(EmitComplexExpr(E, false, false,
91                                              IgnoreResult, IgnoreResult));
92
93  EmitAggExpr(E, AggSlot, IgnoreResult);
94  return AggSlot.asRValue();
95}
96
97/// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
98/// always be accessible even if no aggregate location is provided.
99RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
100  AggValueSlot AggSlot = AggValueSlot::ignored();
101
102  if (hasAggregateLLVMType(E->getType()) &&
103      !E->getType()->isAnyComplexType())
104    AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
105  return EmitAnyExpr(E, AggSlot);
106}
107
108/// EmitAnyExprToMem - Evaluate an expression into a given memory
109/// location.
110void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
111                                       llvm::Value *Location,
112                                       bool IsLocationVolatile,
113                                       bool IsInit) {
114  if (E->getType()->isComplexType())
115    EmitComplexExprIntoAddr(E, Location, IsLocationVolatile);
116  else if (hasAggregateLLVMType(E->getType()))
117    EmitAggExpr(E, AggValueSlot::forAddr(Location, IsLocationVolatile, IsInit));
118  else {
119    RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
120    LValue LV = MakeAddrLValue(Location, E->getType());
121    EmitStoreThroughLValue(RV, LV, E->getType());
122  }
123}
124
125/// \brief An adjustment to be made to the temporary created when emitting a
126/// reference binding, which accesses a particular subobject of that temporary.
127struct SubobjectAdjustment {
128  enum { DerivedToBaseAdjustment, FieldAdjustment } Kind;
129
130  union {
131    struct {
132      const CastExpr *BasePath;
133      const CXXRecordDecl *DerivedClass;
134    } DerivedToBase;
135
136    FieldDecl *Field;
137  };
138
139  SubobjectAdjustment(const CastExpr *BasePath,
140                      const CXXRecordDecl *DerivedClass)
141    : Kind(DerivedToBaseAdjustment)
142  {
143    DerivedToBase.BasePath = BasePath;
144    DerivedToBase.DerivedClass = DerivedClass;
145  }
146
147  SubobjectAdjustment(FieldDecl *Field)
148    : Kind(FieldAdjustment)
149  {
150    this->Field = Field;
151  }
152};
153
154static llvm::Value *
155CreateReferenceTemporary(CodeGenFunction& CGF, QualType Type,
156                         const NamedDecl *InitializedDecl) {
157  if (const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
158    if (VD->hasGlobalStorage()) {
159      llvm::SmallString<256> Name;
160      CGF.CGM.getCXXABI().getMangleContext().mangleReferenceTemporary(VD, Name);
161
162      const llvm::Type *RefTempTy = CGF.ConvertTypeForMem(Type);
163
164      // Create the reference temporary.
165      llvm::GlobalValue *RefTemp =
166        new llvm::GlobalVariable(CGF.CGM.getModule(),
167                                 RefTempTy, /*isConstant=*/false,
168                                 llvm::GlobalValue::InternalLinkage,
169                                 llvm::Constant::getNullValue(RefTempTy),
170                                 Name.str());
171      return RefTemp;
172    }
173  }
174
175  return CGF.CreateMemTemp(Type, "ref.tmp");
176}
177
178static llvm::Value *
179EmitExprForReferenceBinding(CodeGenFunction &CGF, const Expr *E,
180                            llvm::Value *&ReferenceTemporary,
181                            const CXXDestructorDecl *&ReferenceTemporaryDtor,
182                            const NamedDecl *InitializedDecl) {
183  if (const CXXDefaultArgExpr *DAE = dyn_cast<CXXDefaultArgExpr>(E))
184    E = DAE->getExpr();
185
186  if (const CXXExprWithTemporaries *TE = dyn_cast<CXXExprWithTemporaries>(E)) {
187    CodeGenFunction::RunCleanupsScope Scope(CGF);
188
189    return EmitExprForReferenceBinding(CGF, TE->getSubExpr(),
190                                       ReferenceTemporary,
191                                       ReferenceTemporaryDtor,
192                                       InitializedDecl);
193  }
194
195  RValue RV;
196  if (E->isLvalue(CGF.getContext()) == Expr::LV_Valid) {
197    // Emit the expression as an lvalue.
198    LValue LV = CGF.EmitLValue(E);
199    if (LV.isPropertyRef() || LV.isKVCRef()) {
200      QualType QT = E->getType();
201      RValue RV =
202        LV.isPropertyRef() ? CGF.EmitLoadOfPropertyRefLValue(LV, QT)
203                           : CGF.EmitLoadOfKVCRefLValue(LV, QT);
204      assert(RV.isScalar() && "EmitExprForReferenceBinding");
205      return RV.getScalarVal();
206    }
207
208    if (LV.isSimple())
209      return LV.getAddress();
210
211    // We have to load the lvalue.
212    RV = CGF.EmitLoadOfLValue(LV, E->getType());
213  } else {
214    QualType ResultTy = E->getType();
215
216    llvm::SmallVector<SubobjectAdjustment, 2> Adjustments;
217    while (true) {
218      if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
219        E = PE->getSubExpr();
220        continue;
221      }
222
223      if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
224        if ((CE->getCastKind() == CK_DerivedToBase ||
225             CE->getCastKind() == CK_UncheckedDerivedToBase) &&
226            E->getType()->isRecordType()) {
227          E = CE->getSubExpr();
228          CXXRecordDecl *Derived
229            = cast<CXXRecordDecl>(E->getType()->getAs<RecordType>()->getDecl());
230          Adjustments.push_back(SubobjectAdjustment(CE, Derived));
231          continue;
232        }
233
234        if (CE->getCastKind() == CK_NoOp) {
235          E = CE->getSubExpr();
236          continue;
237        }
238      } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
239        if (ME->getBase()->isLvalue(CGF.getContext()) != Expr::LV_Valid &&
240            ME->getBase()->getType()->isRecordType()) {
241          if (FieldDecl *Field = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
242            E = ME->getBase();
243            Adjustments.push_back(SubobjectAdjustment(Field));
244            continue;
245          }
246        }
247      }
248
249      // Nothing changed.
250      break;
251    }
252
253    // Create a reference temporary if necessary.
254    AggValueSlot AggSlot = AggValueSlot::ignored();
255    if (CGF.hasAggregateLLVMType(E->getType()) &&
256        !E->getType()->isAnyComplexType()) {
257      ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
258                                                    InitializedDecl);
259      AggSlot = AggValueSlot::forAddr(ReferenceTemporary, false,
260                                      InitializedDecl != 0);
261    }
262
263    RV = CGF.EmitAnyExpr(E, AggSlot);
264
265    if (InitializedDecl) {
266      // Get the destructor for the reference temporary.
267      if (const RecordType *RT = E->getType()->getAs<RecordType>()) {
268        CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
269        if (!ClassDecl->hasTrivialDestructor())
270          ReferenceTemporaryDtor = ClassDecl->getDestructor();
271      }
272    }
273
274    // Check if need to perform derived-to-base casts and/or field accesses, to
275    // get from the temporary object we created (and, potentially, for which we
276    // extended the lifetime) to the subobject we're binding the reference to.
277    if (!Adjustments.empty()) {
278      llvm::Value *Object = RV.getAggregateAddr();
279      for (unsigned I = Adjustments.size(); I != 0; --I) {
280        SubobjectAdjustment &Adjustment = Adjustments[I-1];
281        switch (Adjustment.Kind) {
282        case SubobjectAdjustment::DerivedToBaseAdjustment:
283          Object =
284              CGF.GetAddressOfBaseClass(Object,
285                                        Adjustment.DerivedToBase.DerivedClass,
286                              Adjustment.DerivedToBase.BasePath->path_begin(),
287                              Adjustment.DerivedToBase.BasePath->path_end(),
288                                        /*NullCheckValue=*/false);
289          break;
290
291        case SubobjectAdjustment::FieldAdjustment: {
292          LValue LV =
293            CGF.EmitLValueForField(Object, Adjustment.Field, 0);
294          if (LV.isSimple()) {
295            Object = LV.getAddress();
296            break;
297          }
298
299          // For non-simple lvalues, we actually have to create a copy of
300          // the object we're binding to.
301          QualType T = Adjustment.Field->getType().getNonReferenceType()
302                                                  .getUnqualifiedType();
303          Object = CreateReferenceTemporary(CGF, T, InitializedDecl);
304          LValue TempLV = CGF.MakeAddrLValue(Object,
305                                             Adjustment.Field->getType());
306          CGF.EmitStoreThroughLValue(CGF.EmitLoadOfLValue(LV, T), TempLV, T);
307          break;
308        }
309
310        }
311      }
312
313      const llvm::Type *ResultPtrTy = CGF.ConvertType(ResultTy)->getPointerTo();
314      return CGF.Builder.CreateBitCast(Object, ResultPtrTy, "temp");
315    }
316  }
317
318  if (RV.isAggregate())
319    return RV.getAggregateAddr();
320
321  // Create a temporary variable that we can bind the reference to.
322  ReferenceTemporary = CreateReferenceTemporary(CGF, E->getType(),
323                                                InitializedDecl);
324
325
326  unsigned Alignment =
327    CGF.getContext().getTypeAlignInChars(E->getType()).getQuantity();
328  if (RV.isScalar())
329    CGF.EmitStoreOfScalar(RV.getScalarVal(), ReferenceTemporary,
330                          /*Volatile=*/false, Alignment, E->getType());
331  else
332    CGF.StoreComplexToAddr(RV.getComplexVal(), ReferenceTemporary,
333                           /*Volatile=*/false);
334  return ReferenceTemporary;
335}
336
337RValue
338CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E,
339                                            const NamedDecl *InitializedDecl) {
340  llvm::Value *ReferenceTemporary = 0;
341  const CXXDestructorDecl *ReferenceTemporaryDtor = 0;
342  llvm::Value *Value = EmitExprForReferenceBinding(*this, E, ReferenceTemporary,
343                                                   ReferenceTemporaryDtor,
344                                                   InitializedDecl);
345  if (!ReferenceTemporaryDtor)
346    return RValue::get(Value);
347
348  // Make sure to call the destructor for the reference temporary.
349  if (const VarDecl *VD = dyn_cast_or_null<VarDecl>(InitializedDecl)) {
350    if (VD->hasGlobalStorage()) {
351      llvm::Constant *DtorFn =
352        CGM.GetAddrOfCXXDestructor(ReferenceTemporaryDtor, Dtor_Complete);
353      CGF.EmitCXXGlobalDtorRegistration(DtorFn,
354                                      cast<llvm::Constant>(ReferenceTemporary));
355
356      return RValue::get(Value);
357    }
358  }
359
360  PushDestructorCleanup(ReferenceTemporaryDtor, ReferenceTemporary);
361
362  return RValue::get(Value);
363}
364
365
366/// getAccessedFieldNo - Given an encoded value and a result number, return the
367/// input field number being accessed.
368unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
369                                             const llvm::Constant *Elts) {
370  if (isa<llvm::ConstantAggregateZero>(Elts))
371    return 0;
372
373  return cast<llvm::ConstantInt>(Elts->getOperand(Idx))->getZExtValue();
374}
375
376void CodeGenFunction::EmitCheck(llvm::Value *Address, unsigned Size) {
377  if (!CatchUndefined)
378    return;
379
380  Address = Builder.CreateBitCast(Address, PtrToInt8Ty);
381
382  const llvm::Type *IntPtrT = IntPtrTy;
383  llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, &IntPtrT, 1);
384  const llvm::IntegerType *Int1Ty = llvm::Type::getInt1Ty(VMContext);
385
386  // In time, people may want to control this and use a 1 here.
387  llvm::Value *Arg = llvm::ConstantInt::get(Int1Ty, 0);
388  llvm::Value *C = Builder.CreateCall2(F, Address, Arg);
389  llvm::BasicBlock *Cont = createBasicBlock();
390  llvm::BasicBlock *Check = createBasicBlock();
391  llvm::Value *NegativeOne = llvm::ConstantInt::get(IntPtrTy, -1ULL);
392  Builder.CreateCondBr(Builder.CreateICmpEQ(C, NegativeOne), Cont, Check);
393
394  EmitBlock(Check);
395  Builder.CreateCondBr(Builder.CreateICmpUGE(C,
396                                        llvm::ConstantInt::get(IntPtrTy, Size)),
397                       Cont, getTrapBB());
398  EmitBlock(Cont);
399}
400
401
402CodeGenFunction::ComplexPairTy CodeGenFunction::
403EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
404                         bool isInc, bool isPre) {
405  ComplexPairTy InVal = LoadComplexFromAddr(LV.getAddress(),
406                                            LV.isVolatileQualified());
407
408  llvm::Value *NextVal;
409  if (isa<llvm::IntegerType>(InVal.first->getType())) {
410    uint64_t AmountVal = isInc ? 1 : -1;
411    NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
412
413    // Add the inc/dec to the real part.
414    NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
415  } else {
416    QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
417    llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
418    if (!isInc)
419      FVal.changeSign();
420    NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
421
422    // Add the inc/dec to the real part.
423    NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
424  }
425
426  ComplexPairTy IncVal(NextVal, InVal.second);
427
428  // Store the updated result through the lvalue.
429  StoreComplexToAddr(IncVal, LV.getAddress(), LV.isVolatileQualified());
430
431  // If this is a postinc, return the value read from memory, otherwise use the
432  // updated value.
433  return isPre ? IncVal : InVal;
434}
435
436
437//===----------------------------------------------------------------------===//
438//                         LValue Expression Emission
439//===----------------------------------------------------------------------===//
440
441RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
442  if (Ty->isVoidType())
443    return RValue::get(0);
444
445  if (const ComplexType *CTy = Ty->getAs<ComplexType>()) {
446    const llvm::Type *EltTy = ConvertType(CTy->getElementType());
447    llvm::Value *U = llvm::UndefValue::get(EltTy);
448    return RValue::getComplex(std::make_pair(U, U));
449  }
450
451  // If this is a use of an undefined aggregate type, the aggregate must have an
452  // identifiable address.  Just because the contents of the value are undefined
453  // doesn't mean that the address can't be taken and compared.
454  if (hasAggregateLLVMType(Ty)) {
455    llvm::Value *DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
456    return RValue::getAggregate(DestPtr);
457  }
458
459  return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
460}
461
462RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
463                                              const char *Name) {
464  ErrorUnsupported(E, Name);
465  return GetUndefRValue(E->getType());
466}
467
468LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
469                                              const char *Name) {
470  ErrorUnsupported(E, Name);
471  llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
472  return MakeAddrLValue(llvm::UndefValue::get(Ty), E->getType());
473}
474
475LValue CodeGenFunction::EmitCheckedLValue(const Expr *E) {
476  LValue LV = EmitLValue(E);
477  if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple())
478    EmitCheck(LV.getAddress(), getContext().getTypeSize(E->getType()) / 8);
479  return LV;
480}
481
482/// EmitLValue - Emit code to compute a designator that specifies the location
483/// of the expression.
484///
485/// This can return one of two things: a simple address or a bitfield reference.
486/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
487/// an LLVM pointer type.
488///
489/// If this returns a bitfield reference, nothing about the pointee type of the
490/// LLVM value is known: For example, it may not be a pointer to an integer.
491///
492/// If this returns a normal address, and if the lvalue's C type is fixed size,
493/// this method guarantees that the returned pointer type will point to an LLVM
494/// type of the same size of the lvalue's type.  If the lvalue has a variable
495/// length type, this is not possible.
496///
497LValue CodeGenFunction::EmitLValue(const Expr *E) {
498  llvm::DenseMap<const Expr *, LValue>::iterator I =
499                                      CGF.ConditionalSaveLValueExprs.find(E);
500  if (I != CGF.ConditionalSaveLValueExprs.end())
501    return I->second;
502
503  switch (E->getStmtClass()) {
504  default: return EmitUnsupportedLValue(E, "l-value expression");
505
506  case Expr::ObjCSelectorExprClass:
507  return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
508  case Expr::ObjCIsaExprClass:
509    return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
510  case Expr::BinaryOperatorClass:
511    return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
512  case Expr::CompoundAssignOperatorClass:
513    return EmitCompoundAssignOperatorLValue(cast<CompoundAssignOperator>(E));
514  case Expr::CallExprClass:
515  case Expr::CXXMemberCallExprClass:
516  case Expr::CXXOperatorCallExprClass:
517    return EmitCallExprLValue(cast<CallExpr>(E));
518  case Expr::VAArgExprClass:
519    return EmitVAArgExprLValue(cast<VAArgExpr>(E));
520  case Expr::DeclRefExprClass:
521    return EmitDeclRefLValue(cast<DeclRefExpr>(E));
522  case Expr::ParenExprClass:return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
523  case Expr::PredefinedExprClass:
524    return EmitPredefinedLValue(cast<PredefinedExpr>(E));
525  case Expr::StringLiteralClass:
526    return EmitStringLiteralLValue(cast<StringLiteral>(E));
527  case Expr::ObjCEncodeExprClass:
528    return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
529
530  case Expr::BlockDeclRefExprClass:
531    return EmitBlockDeclRefLValue(cast<BlockDeclRefExpr>(E));
532
533  case Expr::CXXTemporaryObjectExprClass:
534  case Expr::CXXConstructExprClass:
535    return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
536  case Expr::CXXBindTemporaryExprClass:
537    return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
538  case Expr::CXXExprWithTemporariesClass:
539    return EmitCXXExprWithTemporariesLValue(cast<CXXExprWithTemporaries>(E));
540  case Expr::CXXScalarValueInitExprClass:
541    return EmitNullInitializationLValue(cast<CXXScalarValueInitExpr>(E));
542  case Expr::CXXDefaultArgExprClass:
543    return EmitLValue(cast<CXXDefaultArgExpr>(E)->getExpr());
544  case Expr::CXXTypeidExprClass:
545    return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
546
547  case Expr::ObjCMessageExprClass:
548    return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
549  case Expr::ObjCIvarRefExprClass:
550    return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
551  case Expr::ObjCPropertyRefExprClass:
552    return EmitObjCPropertyRefLValue(cast<ObjCPropertyRefExpr>(E));
553  case Expr::ObjCImplicitSetterGetterRefExprClass:
554    return EmitObjCKVCRefLValue(cast<ObjCImplicitSetterGetterRefExpr>(E));
555  case Expr::StmtExprClass:
556    return EmitStmtExprLValue(cast<StmtExpr>(E));
557  case Expr::UnaryOperatorClass:
558    return EmitUnaryOpLValue(cast<UnaryOperator>(E));
559  case Expr::ArraySubscriptExprClass:
560    return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
561  case Expr::ExtVectorElementExprClass:
562    return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
563  case Expr::MemberExprClass:
564    return EmitMemberExpr(cast<MemberExpr>(E));
565  case Expr::CompoundLiteralExprClass:
566    return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
567  case Expr::ConditionalOperatorClass:
568    return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
569  case Expr::ChooseExprClass:
570    return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr(getContext()));
571  case Expr::ImplicitCastExprClass:
572  case Expr::CStyleCastExprClass:
573  case Expr::CXXFunctionalCastExprClass:
574  case Expr::CXXStaticCastExprClass:
575  case Expr::CXXDynamicCastExprClass:
576  case Expr::CXXReinterpretCastExprClass:
577  case Expr::CXXConstCastExprClass:
578    return EmitCastLValue(cast<CastExpr>(E));
579  }
580}
581
582llvm::Value *CodeGenFunction::EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
583                                              unsigned Alignment, QualType Ty,
584                                              llvm::MDNode *TBAAInfo) {
585  llvm::LoadInst *Load = Builder.CreateLoad(Addr, "tmp");
586  if (Volatile)
587    Load->setVolatile(true);
588  if (Alignment)
589    Load->setAlignment(Alignment);
590  if (TBAAInfo)
591    CGM.DecorateInstruction(Load, TBAAInfo);
592
593  // Bool can have different representation in memory than in registers.
594  llvm::Value *V = Load;
595  if (Ty->isBooleanType())
596    if (V->getType() != llvm::Type::getInt1Ty(VMContext))
597      V = Builder.CreateTrunc(V, llvm::Type::getInt1Ty(VMContext), "tobool");
598
599  return V;
600}
601
602static bool isBooleanUnderlyingType(QualType Ty) {
603  if (const EnumType *ET = dyn_cast<EnumType>(Ty))
604    return ET->getDecl()->getIntegerType()->isBooleanType();
605  return false;
606}
607
608void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
609                                        bool Volatile, unsigned Alignment,
610                                        QualType Ty,
611                                        llvm::MDNode *TBAAInfo) {
612
613  if (Ty->isBooleanType() || isBooleanUnderlyingType(Ty)) {
614    // Bool can have different representation in memory than in registers.
615    const llvm::PointerType *DstPtr = cast<llvm::PointerType>(Addr->getType());
616    Value = Builder.CreateIntCast(Value, DstPtr->getElementType(), false);
617  }
618
619  llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
620  if (Alignment)
621    Store->setAlignment(Alignment);
622  if (TBAAInfo)
623    CGM.DecorateInstruction(Store, TBAAInfo);
624}
625
626/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
627/// method emits the address of the lvalue, then loads the result as an rvalue,
628/// returning the rvalue.
629RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, QualType ExprType) {
630  if (LV.isObjCWeak()) {
631    // load of a __weak object.
632    llvm::Value *AddrWeakObj = LV.getAddress();
633    return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
634                                                             AddrWeakObj));
635  }
636
637  if (LV.isSimple()) {
638    llvm::Value *Ptr = LV.getAddress();
639
640    // Functions are l-values that don't require loading.
641    if (ExprType->isFunctionType())
642      return RValue::get(Ptr);
643
644    // Everything needs a load.
645    return RValue::get(EmitLoadOfScalar(Ptr, LV.isVolatileQualified(),
646                                        LV.getAlignment(), ExprType,
647                                        LV.getTBAAInfo()));
648
649  }
650
651  if (LV.isVectorElt()) {
652    llvm::Value *Vec = Builder.CreateLoad(LV.getVectorAddr(),
653                                          LV.isVolatileQualified(), "tmp");
654    return RValue::get(Builder.CreateExtractElement(Vec, LV.getVectorIdx(),
655                                                    "vecext"));
656  }
657
658  // If this is a reference to a subset of the elements of a vector, either
659  // shuffle the input or extract/insert them as appropriate.
660  if (LV.isExtVectorElt())
661    return EmitLoadOfExtVectorElementLValue(LV, ExprType);
662
663  if (LV.isBitField())
664    return EmitLoadOfBitfieldLValue(LV, ExprType);
665
666  if (LV.isPropertyRef())
667    return EmitLoadOfPropertyRefLValue(LV, ExprType);
668
669  assert(LV.isKVCRef() && "Unknown LValue type!");
670  return EmitLoadOfKVCRefLValue(LV, ExprType);
671}
672
673RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
674                                                 QualType ExprType) {
675  const CGBitFieldInfo &Info = LV.getBitFieldInfo();
676
677  // Get the output type.
678  const llvm::Type *ResLTy = ConvertType(ExprType);
679  unsigned ResSizeInBits = CGM.getTargetData().getTypeSizeInBits(ResLTy);
680
681  // Compute the result as an OR of all of the individual component accesses.
682  llvm::Value *Res = 0;
683  for (unsigned i = 0, e = Info.getNumComponents(); i != e; ++i) {
684    const CGBitFieldInfo::AccessInfo &AI = Info.getComponent(i);
685
686    // Get the field pointer.
687    llvm::Value *Ptr = LV.getBitFieldBaseAddr();
688
689    // Only offset by the field index if used, so that incoming values are not
690    // required to be structures.
691    if (AI.FieldIndex)
692      Ptr = Builder.CreateStructGEP(Ptr, AI.FieldIndex, "bf.field");
693
694    // Offset by the byte offset, if used.
695    if (AI.FieldByteOffset) {
696      const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext);
697      Ptr = Builder.CreateBitCast(Ptr, i8PTy);
698      Ptr = Builder.CreateConstGEP1_32(Ptr, AI.FieldByteOffset,"bf.field.offs");
699    }
700
701    // Cast to the access type.
702    const llvm::Type *PTy = llvm::Type::getIntNPtrTy(VMContext, AI.AccessWidth,
703                                                    ExprType.getAddressSpace());
704    Ptr = Builder.CreateBitCast(Ptr, PTy);
705
706    // Perform the load.
707    llvm::LoadInst *Load = Builder.CreateLoad(Ptr, LV.isVolatileQualified());
708    if (AI.AccessAlignment)
709      Load->setAlignment(AI.AccessAlignment);
710
711    // Shift out unused low bits and mask out unused high bits.
712    llvm::Value *Val = Load;
713    if (AI.FieldBitStart)
714      Val = Builder.CreateLShr(Load, AI.FieldBitStart);
715    Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(AI.AccessWidth,
716                                                            AI.TargetBitWidth),
717                            "bf.clear");
718
719    // Extend or truncate to the target size.
720    if (AI.AccessWidth < ResSizeInBits)
721      Val = Builder.CreateZExt(Val, ResLTy);
722    else if (AI.AccessWidth > ResSizeInBits)
723      Val = Builder.CreateTrunc(Val, ResLTy);
724
725    // Shift into place, and OR into the result.
726    if (AI.TargetBitOffset)
727      Val = Builder.CreateShl(Val, AI.TargetBitOffset);
728    Res = Res ? Builder.CreateOr(Res, Val) : Val;
729  }
730
731  // If the bit-field is signed, perform the sign-extension.
732  //
733  // FIXME: This can easily be folded into the load of the high bits, which
734  // could also eliminate the mask of high bits in some situations.
735  if (Info.isSigned()) {
736    unsigned ExtraBits = ResSizeInBits - Info.getSize();
737    if (ExtraBits)
738      Res = Builder.CreateAShr(Builder.CreateShl(Res, ExtraBits),
739                               ExtraBits, "bf.val.sext");
740  }
741
742  return RValue::get(Res);
743}
744
745RValue CodeGenFunction::EmitLoadOfPropertyRefLValue(LValue LV,
746                                                    QualType ExprType) {
747  return EmitObjCPropertyGet(LV.getPropertyRefExpr());
748}
749
750RValue CodeGenFunction::EmitLoadOfKVCRefLValue(LValue LV,
751                                               QualType ExprType) {
752  return EmitObjCPropertyGet(LV.getKVCRefExpr());
753}
754
755// If this is a reference to a subset of the elements of a vector, create an
756// appropriate shufflevector.
757RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV,
758                                                         QualType ExprType) {
759  llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddr(),
760                                        LV.isVolatileQualified(), "tmp");
761
762  const llvm::Constant *Elts = LV.getExtVectorElts();
763
764  // If the result of the expression is a non-vector type, we must be extracting
765  // a single element.  Just codegen as an extractelement.
766  const VectorType *ExprVT = ExprType->getAs<VectorType>();
767  if (!ExprVT) {
768    unsigned InIdx = getAccessedFieldNo(0, Elts);
769    llvm::Value *Elt = llvm::ConstantInt::get(Int32Ty, InIdx);
770    return RValue::get(Builder.CreateExtractElement(Vec, Elt, "tmp"));
771  }
772
773  // Always use shuffle vector to try to retain the original program structure
774  unsigned NumResultElts = ExprVT->getNumElements();
775
776  llvm::SmallVector<llvm::Constant*, 4> Mask;
777  for (unsigned i = 0; i != NumResultElts; ++i) {
778    unsigned InIdx = getAccessedFieldNo(i, Elts);
779    Mask.push_back(llvm::ConstantInt::get(Int32Ty, InIdx));
780  }
781
782  llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
783  Vec = Builder.CreateShuffleVector(Vec,
784                                    llvm::UndefValue::get(Vec->getType()),
785                                    MaskV, "tmp");
786  return RValue::get(Vec);
787}
788
789
790
791/// EmitStoreThroughLValue - Store the specified rvalue into the specified
792/// lvalue, where both are guaranteed to the have the same type, and that type
793/// is 'Ty'.
794void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
795                                             QualType Ty) {
796  if (!Dst.isSimple()) {
797    if (Dst.isVectorElt()) {
798      // Read/modify/write the vector, inserting the new element.
799      llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddr(),
800                                            Dst.isVolatileQualified(), "tmp");
801      Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
802                                        Dst.getVectorIdx(), "vecins");
803      Builder.CreateStore(Vec, Dst.getVectorAddr(),Dst.isVolatileQualified());
804      return;
805    }
806
807    // If this is an update of extended vector elements, insert them as
808    // appropriate.
809    if (Dst.isExtVectorElt())
810      return EmitStoreThroughExtVectorComponentLValue(Src, Dst, Ty);
811
812    if (Dst.isBitField())
813      return EmitStoreThroughBitfieldLValue(Src, Dst, Ty);
814
815    if (Dst.isPropertyRef())
816      return EmitStoreThroughPropertyRefLValue(Src, Dst, Ty);
817
818    assert(Dst.isKVCRef() && "Unknown LValue type");
819    return EmitStoreThroughKVCRefLValue(Src, Dst, Ty);
820  }
821
822  if (Dst.isObjCWeak() && !Dst.isNonGC()) {
823    // load of a __weak object.
824    llvm::Value *LvalueDst = Dst.getAddress();
825    llvm::Value *src = Src.getScalarVal();
826     CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
827    return;
828  }
829
830  if (Dst.isObjCStrong() && !Dst.isNonGC()) {
831    // load of a __strong object.
832    llvm::Value *LvalueDst = Dst.getAddress();
833    llvm::Value *src = Src.getScalarVal();
834    if (Dst.isObjCIvar()) {
835      assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL");
836      const llvm::Type *ResultType = ConvertType(getContext().LongTy);
837      llvm::Value *RHS = EmitScalarExpr(Dst.getBaseIvarExp());
838      llvm::Value *dst = RHS;
839      RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
840      llvm::Value *LHS =
841        Builder.CreatePtrToInt(LvalueDst, ResultType, "sub.ptr.lhs.cast");
842      llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
843      CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
844                                              BytesBetween);
845    } else if (Dst.isGlobalObjCRef()) {
846      CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
847                                                Dst.isThreadLocalRef());
848    }
849    else
850      CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
851    return;
852  }
853
854  assert(Src.isScalar() && "Can't emit an agg store with this method");
855  EmitStoreOfScalar(Src.getScalarVal(), Dst.getAddress(),
856                    Dst.isVolatileQualified(), Dst.getAlignment(), Ty,
857                    Dst.getTBAAInfo());
858}
859
860void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
861                                                     QualType Ty,
862                                                     llvm::Value **Result) {
863  const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
864
865  // Get the output type.
866  const llvm::Type *ResLTy = ConvertTypeForMem(Ty);
867  unsigned ResSizeInBits = CGM.getTargetData().getTypeSizeInBits(ResLTy);
868
869  // Get the source value, truncated to the width of the bit-field.
870  llvm::Value *SrcVal = Src.getScalarVal();
871
872  if (Ty->isBooleanType())
873    SrcVal = Builder.CreateIntCast(SrcVal, ResLTy, /*IsSigned=*/false);
874
875  SrcVal = Builder.CreateAnd(SrcVal, llvm::APInt::getLowBitsSet(ResSizeInBits,
876                                                                Info.getSize()),
877                             "bf.value");
878
879  // Return the new value of the bit-field, if requested.
880  if (Result) {
881    // Cast back to the proper type for result.
882    const llvm::Type *SrcTy = Src.getScalarVal()->getType();
883    llvm::Value *ReloadVal = Builder.CreateIntCast(SrcVal, SrcTy, false,
884                                                   "bf.reload.val");
885
886    // Sign extend if necessary.
887    if (Info.isSigned()) {
888      unsigned ExtraBits = ResSizeInBits - Info.getSize();
889      if (ExtraBits)
890        ReloadVal = Builder.CreateAShr(Builder.CreateShl(ReloadVal, ExtraBits),
891                                       ExtraBits, "bf.reload.sext");
892    }
893
894    *Result = ReloadVal;
895  }
896
897  // Iterate over the components, writing each piece to memory.
898  for (unsigned i = 0, e = Info.getNumComponents(); i != e; ++i) {
899    const CGBitFieldInfo::AccessInfo &AI = Info.getComponent(i);
900
901    // Get the field pointer.
902    llvm::Value *Ptr = Dst.getBitFieldBaseAddr();
903
904    // Only offset by the field index if used, so that incoming values are not
905    // required to be structures.
906    if (AI.FieldIndex)
907      Ptr = Builder.CreateStructGEP(Ptr, AI.FieldIndex, "bf.field");
908
909    // Offset by the byte offset, if used.
910    if (AI.FieldByteOffset) {
911      const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext);
912      Ptr = Builder.CreateBitCast(Ptr, i8PTy);
913      Ptr = Builder.CreateConstGEP1_32(Ptr, AI.FieldByteOffset,"bf.field.offs");
914    }
915
916    // Cast to the access type.
917    const llvm::Type *PTy = llvm::Type::getIntNPtrTy(VMContext, AI.AccessWidth,
918                                                     Ty.getAddressSpace());
919    Ptr = Builder.CreateBitCast(Ptr, PTy);
920
921    // Extract the piece of the bit-field value to write in this access, limited
922    // to the values that are part of this access.
923    llvm::Value *Val = SrcVal;
924    if (AI.TargetBitOffset)
925      Val = Builder.CreateLShr(Val, AI.TargetBitOffset);
926    Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(ResSizeInBits,
927                                                            AI.TargetBitWidth));
928
929    // Extend or truncate to the access size.
930    const llvm::Type *AccessLTy =
931      llvm::Type::getIntNTy(VMContext, AI.AccessWidth);
932    if (ResSizeInBits < AI.AccessWidth)
933      Val = Builder.CreateZExt(Val, AccessLTy);
934    else if (ResSizeInBits > AI.AccessWidth)
935      Val = Builder.CreateTrunc(Val, AccessLTy);
936
937    // Shift into the position in memory.
938    if (AI.FieldBitStart)
939      Val = Builder.CreateShl(Val, AI.FieldBitStart);
940
941    // If necessary, load and OR in bits that are outside of the bit-field.
942    if (AI.TargetBitWidth != AI.AccessWidth) {
943      llvm::LoadInst *Load = Builder.CreateLoad(Ptr, Dst.isVolatileQualified());
944      if (AI.AccessAlignment)
945        Load->setAlignment(AI.AccessAlignment);
946
947      // Compute the mask for zeroing the bits that are part of the bit-field.
948      llvm::APInt InvMask =
949        ~llvm::APInt::getBitsSet(AI.AccessWidth, AI.FieldBitStart,
950                                 AI.FieldBitStart + AI.TargetBitWidth);
951
952      // Apply the mask and OR in to the value to write.
953      Val = Builder.CreateOr(Builder.CreateAnd(Load, InvMask), Val);
954    }
955
956    // Write the value.
957    llvm::StoreInst *Store = Builder.CreateStore(Val, Ptr,
958                                                 Dst.isVolatileQualified());
959    if (AI.AccessAlignment)
960      Store->setAlignment(AI.AccessAlignment);
961  }
962}
963
964void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src,
965                                                        LValue Dst,
966                                                        QualType Ty) {
967  EmitObjCPropertySet(Dst.getPropertyRefExpr(), Src);
968}
969
970void CodeGenFunction::EmitStoreThroughKVCRefLValue(RValue Src,
971                                                   LValue Dst,
972                                                   QualType Ty) {
973  EmitObjCPropertySet(Dst.getKVCRefExpr(), Src);
974}
975
976void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
977                                                               LValue Dst,
978                                                               QualType Ty) {
979  // This access turns into a read/modify/write of the vector.  Load the input
980  // value now.
981  llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddr(),
982                                        Dst.isVolatileQualified(), "tmp");
983  const llvm::Constant *Elts = Dst.getExtVectorElts();
984
985  llvm::Value *SrcVal = Src.getScalarVal();
986
987  if (const VectorType *VTy = Ty->getAs<VectorType>()) {
988    unsigned NumSrcElts = VTy->getNumElements();
989    unsigned NumDstElts =
990       cast<llvm::VectorType>(Vec->getType())->getNumElements();
991    if (NumDstElts == NumSrcElts) {
992      // Use shuffle vector is the src and destination are the same number of
993      // elements and restore the vector mask since it is on the side it will be
994      // stored.
995      llvm::SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
996      for (unsigned i = 0; i != NumSrcElts; ++i) {
997        unsigned InIdx = getAccessedFieldNo(i, Elts);
998        Mask[InIdx] = llvm::ConstantInt::get(Int32Ty, i);
999      }
1000
1001      llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
1002      Vec = Builder.CreateShuffleVector(SrcVal,
1003                                        llvm::UndefValue::get(Vec->getType()),
1004                                        MaskV, "tmp");
1005    } else if (NumDstElts > NumSrcElts) {
1006      // Extended the source vector to the same length and then shuffle it
1007      // into the destination.
1008      // FIXME: since we're shuffling with undef, can we just use the indices
1009      //        into that?  This could be simpler.
1010      llvm::SmallVector<llvm::Constant*, 4> ExtMask;
1011      unsigned i;
1012      for (i = 0; i != NumSrcElts; ++i)
1013        ExtMask.push_back(llvm::ConstantInt::get(Int32Ty, i));
1014      for (; i != NumDstElts; ++i)
1015        ExtMask.push_back(llvm::UndefValue::get(Int32Ty));
1016      llvm::Value *ExtMaskV = llvm::ConstantVector::get(&ExtMask[0],
1017                                                        ExtMask.size());
1018      llvm::Value *ExtSrcVal =
1019        Builder.CreateShuffleVector(SrcVal,
1020                                    llvm::UndefValue::get(SrcVal->getType()),
1021                                    ExtMaskV, "tmp");
1022      // build identity
1023      llvm::SmallVector<llvm::Constant*, 4> Mask;
1024      for (unsigned i = 0; i != NumDstElts; ++i)
1025        Mask.push_back(llvm::ConstantInt::get(Int32Ty, i));
1026
1027      // modify when what gets shuffled in
1028      for (unsigned i = 0; i != NumSrcElts; ++i) {
1029        unsigned Idx = getAccessedFieldNo(i, Elts);
1030        Mask[Idx] = llvm::ConstantInt::get(Int32Ty, i+NumDstElts);
1031      }
1032      llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
1033      Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV, "tmp");
1034    } else {
1035      // We should never shorten the vector
1036      assert(0 && "unexpected shorten vector length");
1037    }
1038  } else {
1039    // If the Src is a scalar (not a vector) it must be updating one element.
1040    unsigned InIdx = getAccessedFieldNo(0, Elts);
1041    llvm::Value *Elt = llvm::ConstantInt::get(Int32Ty, InIdx);
1042    Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt, "tmp");
1043  }
1044
1045  Builder.CreateStore(Vec, Dst.getExtVectorAddr(), Dst.isVolatileQualified());
1046}
1047
1048// setObjCGCLValueClass - sets class of he lvalue for the purpose of
1049// generating write-barries API. It is currently a global, ivar,
1050// or neither.
1051static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
1052                                 LValue &LV) {
1053  if (Ctx.getLangOptions().getGCMode() == LangOptions::NonGC)
1054    return;
1055
1056  if (isa<ObjCIvarRefExpr>(E)) {
1057    LV.setObjCIvar(true);
1058    ObjCIvarRefExpr *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr*>(E));
1059    LV.setBaseIvarExp(Exp->getBase());
1060    LV.setObjCArray(E->getType()->isArrayType());
1061    return;
1062  }
1063
1064  if (const DeclRefExpr *Exp = dyn_cast<DeclRefExpr>(E)) {
1065    if (const VarDecl *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
1066      if (VD->hasGlobalStorage()) {
1067        LV.setGlobalObjCRef(true);
1068        LV.setThreadLocalRef(VD->isThreadSpecified());
1069      }
1070    }
1071    LV.setObjCArray(E->getType()->isArrayType());
1072    return;
1073  }
1074
1075  if (const UnaryOperator *Exp = dyn_cast<UnaryOperator>(E)) {
1076    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
1077    return;
1078  }
1079
1080  if (const ParenExpr *Exp = dyn_cast<ParenExpr>(E)) {
1081    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
1082    if (LV.isObjCIvar()) {
1083      // If cast is to a structure pointer, follow gcc's behavior and make it
1084      // a non-ivar write-barrier.
1085      QualType ExpTy = E->getType();
1086      if (ExpTy->isPointerType())
1087        ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
1088      if (ExpTy->isRecordType())
1089        LV.setObjCIvar(false);
1090    }
1091    return;
1092  }
1093  if (const ImplicitCastExpr *Exp = dyn_cast<ImplicitCastExpr>(E)) {
1094    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
1095    return;
1096  }
1097
1098  if (const CStyleCastExpr *Exp = dyn_cast<CStyleCastExpr>(E)) {
1099    setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV);
1100    return;
1101  }
1102
1103  if (const ArraySubscriptExpr *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
1104    setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
1105    if (LV.isObjCIvar() && !LV.isObjCArray())
1106      // Using array syntax to assigning to what an ivar points to is not
1107      // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
1108      LV.setObjCIvar(false);
1109    else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
1110      // Using array syntax to assigning to what global points to is not
1111      // same as assigning to the global itself. {id *G;} G[i] = 0;
1112      LV.setGlobalObjCRef(false);
1113    return;
1114  }
1115
1116  if (const MemberExpr *Exp = dyn_cast<MemberExpr>(E)) {
1117    setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
1118    // We don't know if member is an 'ivar', but this flag is looked at
1119    // only in the context of LV.isObjCIvar().
1120    LV.setObjCArray(E->getType()->isArrayType());
1121    return;
1122  }
1123}
1124
1125static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
1126                                      const Expr *E, const VarDecl *VD) {
1127  assert((VD->hasExternalStorage() || VD->isFileVarDecl()) &&
1128         "Var decl must have external storage or be a file var decl!");
1129
1130  llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
1131  if (VD->getType()->isReferenceType())
1132    V = CGF.Builder.CreateLoad(V, "tmp");
1133  unsigned Alignment = CGF.getContext().getDeclAlign(VD).getQuantity();
1134  LValue LV = CGF.MakeAddrLValue(V, E->getType(), Alignment);
1135  setObjCGCLValueClass(CGF.getContext(), E, LV);
1136  return LV;
1137}
1138
1139static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
1140                                      const Expr *E, const FunctionDecl *FD) {
1141  llvm::Value *V = CGF.CGM.GetAddrOfFunction(FD);
1142  if (!FD->hasPrototype()) {
1143    if (const FunctionProtoType *Proto =
1144            FD->getType()->getAs<FunctionProtoType>()) {
1145      // Ugly case: for a K&R-style definition, the type of the definition
1146      // isn't the same as the type of a use.  Correct for this with a
1147      // bitcast.
1148      QualType NoProtoType =
1149          CGF.getContext().getFunctionNoProtoType(Proto->getResultType());
1150      NoProtoType = CGF.getContext().getPointerType(NoProtoType);
1151      V = CGF.Builder.CreateBitCast(V, CGF.ConvertType(NoProtoType), "tmp");
1152    }
1153  }
1154  unsigned Alignment = CGF.getContext().getDeclAlign(FD).getQuantity();
1155  return CGF.MakeAddrLValue(V, E->getType(), Alignment);
1156}
1157
1158LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
1159  const NamedDecl *ND = E->getDecl();
1160  unsigned Alignment = CGF.getContext().getDeclAlign(ND).getQuantity();
1161
1162  if (ND->hasAttr<WeakRefAttr>()) {
1163    const ValueDecl *VD = cast<ValueDecl>(ND);
1164    llvm::Constant *Aliasee = CGM.GetWeakRefReference(VD);
1165    return MakeAddrLValue(Aliasee, E->getType(), Alignment);
1166  }
1167
1168  if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
1169
1170    // Check if this is a global variable.
1171    if (VD->hasExternalStorage() || VD->isFileVarDecl())
1172      return EmitGlobalVarDeclLValue(*this, E, VD);
1173
1174    bool NonGCable = VD->hasLocalStorage() && !VD->hasAttr<BlocksAttr>();
1175
1176    llvm::Value *V = LocalDeclMap[VD];
1177    if (!V && VD->isStaticLocal())
1178      V = CGM.getStaticLocalDeclAddress(VD);
1179    assert(V && "DeclRefExpr not entered in LocalDeclMap?");
1180
1181    if (VD->hasAttr<BlocksAttr>()) {
1182      V = Builder.CreateStructGEP(V, 1, "forwarding");
1183      V = Builder.CreateLoad(V);
1184      V = Builder.CreateStructGEP(V, getByRefValueLLVMField(VD),
1185                                  VD->getNameAsString());
1186    }
1187    if (VD->getType()->isReferenceType())
1188      V = Builder.CreateLoad(V, "tmp");
1189
1190    LValue LV = MakeAddrLValue(V, E->getType(), Alignment);
1191    if (NonGCable) {
1192      LV.getQuals().removeObjCGCAttr();
1193      LV.setNonGC(true);
1194    }
1195    setObjCGCLValueClass(getContext(), E, LV);
1196    return LV;
1197  }
1198
1199  // If we're emitting an instance method as an independent lvalue,
1200  // we're actually emitting a member pointer.
1201  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
1202    if (MD->isInstance()) {
1203      llvm::Value *V = CGM.getCXXABI().EmitMemberPointer(MD);
1204      return MakeAddrLValue(V, MD->getType(), Alignment);
1205    }
1206  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
1207    return EmitFunctionDeclLValue(*this, E, FD);
1208
1209  // If we're emitting a field as an independent lvalue, we're
1210  // actually emitting a member pointer.
1211  if (const FieldDecl *FD = dyn_cast<FieldDecl>(ND)) {
1212    llvm::Value *V = CGM.getCXXABI().EmitMemberPointer(FD);
1213    return MakeAddrLValue(V, FD->getType(), Alignment);
1214  }
1215
1216  assert(false && "Unhandled DeclRefExpr");
1217
1218  // an invalid LValue, but the assert will
1219  // ensure that this point is never reached.
1220  return LValue();
1221}
1222
1223LValue CodeGenFunction::EmitBlockDeclRefLValue(const BlockDeclRefExpr *E) {
1224  unsigned Alignment =
1225    CGF.getContext().getDeclAlign(E->getDecl()).getQuantity();
1226  return MakeAddrLValue(GetAddrOfBlockDecl(E), E->getType(), Alignment);
1227}
1228
1229LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
1230  // __extension__ doesn't affect lvalue-ness.
1231  if (E->getOpcode() == UO_Extension)
1232    return EmitLValue(E->getSubExpr());
1233
1234  QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
1235  switch (E->getOpcode()) {
1236  default: assert(0 && "Unknown unary operator lvalue!");
1237  case UO_Deref: {
1238    QualType T = E->getSubExpr()->getType()->getPointeeType();
1239    assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
1240
1241    LValue LV = MakeAddrLValue(EmitScalarExpr(E->getSubExpr()), T);
1242    LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
1243
1244    // We should not generate __weak write barrier on indirect reference
1245    // of a pointer to object; as in void foo (__weak id *param); *param = 0;
1246    // But, we continue to generate __strong write barrier on indirect write
1247    // into a pointer to object.
1248    if (getContext().getLangOptions().ObjC1 &&
1249        getContext().getLangOptions().getGCMode() != LangOptions::NonGC &&
1250        LV.isObjCWeak())
1251      LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
1252    return LV;
1253  }
1254  case UO_Real:
1255  case UO_Imag: {
1256    LValue LV = EmitLValue(E->getSubExpr());
1257    unsigned Idx = E->getOpcode() == UO_Imag;
1258    return MakeAddrLValue(Builder.CreateStructGEP(LV.getAddress(),
1259                                                    Idx, "idx"),
1260                          ExprTy);
1261  }
1262  case UO_PreInc:
1263  case UO_PreDec: {
1264    LValue LV = EmitLValue(E->getSubExpr());
1265    bool isInc = E->getOpcode() == UO_PreInc;
1266
1267    if (E->getType()->isAnyComplexType())
1268      EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
1269    else
1270      EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
1271    return LV;
1272  }
1273  }
1274}
1275
1276LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
1277  return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
1278                        E->getType());
1279}
1280
1281LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
1282  return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
1283                        E->getType());
1284}
1285
1286
1287LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
1288  switch (E->getIdentType()) {
1289  default:
1290    return EmitUnsupportedLValue(E, "predefined expression");
1291
1292  case PredefinedExpr::Func:
1293  case PredefinedExpr::Function:
1294  case PredefinedExpr::PrettyFunction: {
1295    unsigned Type = E->getIdentType();
1296    std::string GlobalVarName;
1297
1298    switch (Type) {
1299    default: assert(0 && "Invalid type");
1300    case PredefinedExpr::Func:
1301      GlobalVarName = "__func__.";
1302      break;
1303    case PredefinedExpr::Function:
1304      GlobalVarName = "__FUNCTION__.";
1305      break;
1306    case PredefinedExpr::PrettyFunction:
1307      GlobalVarName = "__PRETTY_FUNCTION__.";
1308      break;
1309    }
1310
1311    llvm::StringRef FnName = CurFn->getName();
1312    if (FnName.startswith("\01"))
1313      FnName = FnName.substr(1);
1314    GlobalVarName += FnName;
1315
1316    const Decl *CurDecl = CurCodeDecl;
1317    if (CurDecl == 0)
1318      CurDecl = getContext().getTranslationUnitDecl();
1319
1320    std::string FunctionName =
1321      PredefinedExpr::ComputeName((PredefinedExpr::IdentType)Type, CurDecl);
1322
1323    llvm::Constant *C =
1324      CGM.GetAddrOfConstantCString(FunctionName, GlobalVarName.c_str());
1325    return MakeAddrLValue(C, E->getType());
1326  }
1327  }
1328}
1329
1330llvm::BasicBlock *CodeGenFunction::getTrapBB() {
1331  const CodeGenOptions &GCO = CGM.getCodeGenOpts();
1332
1333  // If we are not optimzing, don't collapse all calls to trap in the function
1334  // to the same call, that way, in the debugger they can see which operation
1335  // did in fact fail.  If we are optimizing, we collapse all calls to trap down
1336  // to just one per function to save on codesize.
1337  if (GCO.OptimizationLevel && TrapBB)
1338    return TrapBB;
1339
1340  llvm::BasicBlock *Cont = 0;
1341  if (HaveInsertPoint()) {
1342    Cont = createBasicBlock("cont");
1343    EmitBranch(Cont);
1344  }
1345  TrapBB = createBasicBlock("trap");
1346  EmitBlock(TrapBB);
1347
1348  llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::trap, 0, 0);
1349  llvm::CallInst *TrapCall = Builder.CreateCall(F);
1350  TrapCall->setDoesNotReturn();
1351  TrapCall->setDoesNotThrow();
1352  Builder.CreateUnreachable();
1353
1354  if (Cont)
1355    EmitBlock(Cont);
1356  return TrapBB;
1357}
1358
1359/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
1360/// array to pointer, return the array subexpression.
1361static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
1362  // If this isn't just an array->pointer decay, bail out.
1363  const CastExpr *CE = dyn_cast<CastExpr>(E);
1364  if (CE == 0 || CE->getCastKind() != CK_ArrayToPointerDecay)
1365    return 0;
1366
1367  // If this is a decay from variable width array, bail out.
1368  const Expr *SubExpr = CE->getSubExpr();
1369  if (SubExpr->getType()->isVariableArrayType())
1370    return 0;
1371
1372  return SubExpr;
1373}
1374
1375LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E) {
1376  // The index must always be an integer, which is not an aggregate.  Emit it.
1377  llvm::Value *Idx = EmitScalarExpr(E->getIdx());
1378  QualType IdxTy  = E->getIdx()->getType();
1379  bool IdxSigned = IdxTy->isSignedIntegerType();
1380
1381  // If the base is a vector type, then we are forming a vector element lvalue
1382  // with this subscript.
1383  if (E->getBase()->getType()->isVectorType()) {
1384    // Emit the vector as an lvalue to get its address.
1385    LValue LHS = EmitLValue(E->getBase());
1386    assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
1387    Idx = Builder.CreateIntCast(Idx, CGF.Int32Ty, IdxSigned, "vidx");
1388    return LValue::MakeVectorElt(LHS.getAddress(), Idx,
1389                                 E->getBase()->getType().getCVRQualifiers());
1390  }
1391
1392  // Extend or truncate the index type to 32 or 64-bits.
1393  if (!Idx->getType()->isIntegerTy(LLVMPointerWidth))
1394    Idx = Builder.CreateIntCast(Idx, IntPtrTy,
1395                                IdxSigned, "idxprom");
1396
1397  // FIXME: As llvm implements the object size checking, this can come out.
1398  if (CatchUndefined) {
1399    if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E->getBase())){
1400      if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr())) {
1401        if (ICE->getCastKind() == CK_ArrayToPointerDecay) {
1402          if (const ConstantArrayType *CAT
1403              = getContext().getAsConstantArrayType(DRE->getType())) {
1404            llvm::APInt Size = CAT->getSize();
1405            llvm::BasicBlock *Cont = createBasicBlock("cont");
1406            Builder.CreateCondBr(Builder.CreateICmpULE(Idx,
1407                                  llvm::ConstantInt::get(Idx->getType(), Size)),
1408                                 Cont, getTrapBB());
1409            EmitBlock(Cont);
1410          }
1411        }
1412      }
1413    }
1414  }
1415
1416  // We know that the pointer points to a type of the correct size, unless the
1417  // size is a VLA or Objective-C interface.
1418  llvm::Value *Address = 0;
1419  if (const VariableArrayType *VAT =
1420        getContext().getAsVariableArrayType(E->getType())) {
1421    llvm::Value *VLASize = GetVLASize(VAT);
1422
1423    Idx = Builder.CreateMul(Idx, VLASize);
1424
1425    QualType BaseType = getContext().getBaseElementType(VAT);
1426
1427    CharUnits BaseTypeSize = getContext().getTypeSizeInChars(BaseType);
1428    Idx = Builder.CreateUDiv(Idx,
1429                             llvm::ConstantInt::get(Idx->getType(),
1430                                 BaseTypeSize.getQuantity()));
1431
1432    // The base must be a pointer, which is not an aggregate.  Emit it.
1433    llvm::Value *Base = EmitScalarExpr(E->getBase());
1434
1435    Address = Builder.CreateInBoundsGEP(Base, Idx, "arrayidx");
1436  } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
1437    // Indexing over an interface, as in "NSString *P; P[4];"
1438    llvm::Value *InterfaceSize =
1439      llvm::ConstantInt::get(Idx->getType(),
1440          getContext().getTypeSizeInChars(OIT).getQuantity());
1441
1442    Idx = Builder.CreateMul(Idx, InterfaceSize);
1443
1444    const llvm::Type *i8PTy = llvm::Type::getInt8PtrTy(VMContext);
1445
1446    // The base must be a pointer, which is not an aggregate.  Emit it.
1447    llvm::Value *Base = EmitScalarExpr(E->getBase());
1448    Address = Builder.CreateGEP(Builder.CreateBitCast(Base, i8PTy),
1449                                Idx, "arrayidx");
1450    Address = Builder.CreateBitCast(Address, Base->getType());
1451  } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
1452    // If this is A[i] where A is an array, the frontend will have decayed the
1453    // base to be a ArrayToPointerDecay implicit cast.  While correct, it is
1454    // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
1455    // "gep x, i" here.  Emit one "gep A, 0, i".
1456    assert(Array->getType()->isArrayType() &&
1457           "Array to pointer decay must have array source type!");
1458    llvm::Value *ArrayPtr = EmitLValue(Array).getAddress();
1459    llvm::Value *Zero = llvm::ConstantInt::get(Int32Ty, 0);
1460    llvm::Value *Args[] = { Zero, Idx };
1461
1462    Address = Builder.CreateInBoundsGEP(ArrayPtr, Args, Args+2, "arrayidx");
1463  } else {
1464    // The base must be a pointer, which is not an aggregate.  Emit it.
1465    llvm::Value *Base = EmitScalarExpr(E->getBase());
1466    Address = Builder.CreateInBoundsGEP(Base, Idx, "arrayidx");
1467  }
1468
1469  QualType T = E->getBase()->getType()->getPointeeType();
1470  assert(!T.isNull() &&
1471         "CodeGenFunction::EmitArraySubscriptExpr(): Illegal base type");
1472
1473  LValue LV = MakeAddrLValue(Address, T);
1474  LV.getQuals().setAddressSpace(E->getBase()->getType().getAddressSpace());
1475
1476  if (getContext().getLangOptions().ObjC1 &&
1477      getContext().getLangOptions().getGCMode() != LangOptions::NonGC) {
1478    LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
1479    setObjCGCLValueClass(getContext(), E, LV);
1480  }
1481  return LV;
1482}
1483
1484static
1485llvm::Constant *GenerateConstantVector(llvm::LLVMContext &VMContext,
1486                                       llvm::SmallVector<unsigned, 4> &Elts) {
1487  llvm::SmallVector<llvm::Constant*, 4> CElts;
1488
1489  const llvm::Type *Int32Ty = llvm::Type::getInt32Ty(VMContext);
1490  for (unsigned i = 0, e = Elts.size(); i != e; ++i)
1491    CElts.push_back(llvm::ConstantInt::get(Int32Ty, Elts[i]));
1492
1493  return llvm::ConstantVector::get(&CElts[0], CElts.size());
1494}
1495
1496LValue CodeGenFunction::
1497EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
1498  // Emit the base vector as an l-value.
1499  LValue Base;
1500
1501  // ExtVectorElementExpr's base can either be a vector or pointer to vector.
1502  if (E->isArrow()) {
1503    // If it is a pointer to a vector, emit the address and form an lvalue with
1504    // it.
1505    llvm::Value *Ptr = EmitScalarExpr(E->getBase());
1506    const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
1507    Base = MakeAddrLValue(Ptr, PT->getPointeeType());
1508    Base.getQuals().removeObjCGCAttr();
1509  } else if (E->getBase()->isLvalue(getContext()) == Expr::LV_Valid) {
1510    // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
1511    // emit the base as an lvalue.
1512    assert(E->getBase()->getType()->isVectorType());
1513    Base = EmitLValue(E->getBase());
1514  } else {
1515    // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
1516    assert(E->getBase()->getType()->getAs<VectorType>() &&
1517           "Result must be a vector");
1518    llvm::Value *Vec = EmitScalarExpr(E->getBase());
1519
1520    // Store the vector to memory (because LValue wants an address).
1521    llvm::Value *VecMem = CreateMemTemp(E->getBase()->getType());
1522    Builder.CreateStore(Vec, VecMem);
1523    Base = MakeAddrLValue(VecMem, E->getBase()->getType());
1524  }
1525
1526  // Encode the element access list into a vector of unsigned indices.
1527  llvm::SmallVector<unsigned, 4> Indices;
1528  E->getEncodedElementAccess(Indices);
1529
1530  if (Base.isSimple()) {
1531    llvm::Constant *CV = GenerateConstantVector(VMContext, Indices);
1532    return LValue::MakeExtVectorElt(Base.getAddress(), CV,
1533                                    Base.getVRQualifiers());
1534  }
1535  assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
1536
1537  llvm::Constant *BaseElts = Base.getExtVectorElts();
1538  llvm::SmallVector<llvm::Constant *, 4> CElts;
1539
1540  for (unsigned i = 0, e = Indices.size(); i != e; ++i) {
1541    if (isa<llvm::ConstantAggregateZero>(BaseElts))
1542      CElts.push_back(llvm::ConstantInt::get(Int32Ty, 0));
1543    else
1544      CElts.push_back(cast<llvm::Constant>(BaseElts->getOperand(Indices[i])));
1545  }
1546  llvm::Constant *CV = llvm::ConstantVector::get(&CElts[0], CElts.size());
1547  return LValue::MakeExtVectorElt(Base.getExtVectorAddr(), CV,
1548                                  Base.getVRQualifiers());
1549}
1550
1551LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
1552  bool isNonGC = false;
1553  Expr *BaseExpr = E->getBase();
1554  llvm::Value *BaseValue = NULL;
1555  Qualifiers BaseQuals;
1556
1557  // If this is s.x, emit s as an lvalue.  If it is s->x, emit s as a scalar.
1558  if (E->isArrow()) {
1559    BaseValue = EmitScalarExpr(BaseExpr);
1560    const PointerType *PTy =
1561      BaseExpr->getType()->getAs<PointerType>();
1562    BaseQuals = PTy->getPointeeType().getQualifiers();
1563  } else if (isa<ObjCPropertyRefExpr>(BaseExpr->IgnoreParens()) ||
1564             isa<ObjCImplicitSetterGetterRefExpr>(
1565               BaseExpr->IgnoreParens())) {
1566    RValue RV = EmitObjCPropertyGet(BaseExpr);
1567    BaseValue = RV.getAggregateAddr();
1568    BaseQuals = BaseExpr->getType().getQualifiers();
1569  } else {
1570    LValue BaseLV = EmitLValue(BaseExpr);
1571    if (BaseLV.isNonGC())
1572      isNonGC = true;
1573    // FIXME: this isn't right for bitfields.
1574    BaseValue = BaseLV.getAddress();
1575    QualType BaseTy = BaseExpr->getType();
1576    BaseQuals = BaseTy.getQualifiers();
1577  }
1578
1579  NamedDecl *ND = E->getMemberDecl();
1580  if (FieldDecl *Field = dyn_cast<FieldDecl>(ND)) {
1581    LValue LV = EmitLValueForField(BaseValue, Field,
1582                                   BaseQuals.getCVRQualifiers());
1583    LV.setNonGC(isNonGC);
1584    setObjCGCLValueClass(getContext(), E, LV);
1585    return LV;
1586  }
1587
1588  if (VarDecl *VD = dyn_cast<VarDecl>(ND))
1589    return EmitGlobalVarDeclLValue(*this, E, VD);
1590
1591  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
1592    return EmitFunctionDeclLValue(*this, E, FD);
1593
1594  assert(false && "Unhandled member declaration!");
1595  return LValue();
1596}
1597
1598LValue CodeGenFunction::EmitLValueForBitfield(llvm::Value *BaseValue,
1599                                              const FieldDecl *Field,
1600                                              unsigned CVRQualifiers) {
1601  const CGRecordLayout &RL =
1602    CGM.getTypes().getCGRecordLayout(Field->getParent());
1603  const CGBitFieldInfo &Info = RL.getBitFieldInfo(Field);
1604  return LValue::MakeBitfield(BaseValue, Info,
1605                             Field->getType().getCVRQualifiers()|CVRQualifiers);
1606}
1607
1608/// EmitLValueForAnonRecordField - Given that the field is a member of
1609/// an anonymous struct or union buried inside a record, and given
1610/// that the base value is a pointer to the enclosing record, derive
1611/// an lvalue for the ultimate field.
1612LValue CodeGenFunction::EmitLValueForAnonRecordField(llvm::Value *BaseValue,
1613                                                     const FieldDecl *Field,
1614                                                     unsigned CVRQualifiers) {
1615  llvm::SmallVector<const FieldDecl *, 8> Path;
1616  Path.push_back(Field);
1617
1618  while (Field->getParent()->isAnonymousStructOrUnion()) {
1619    const ValueDecl *VD = Field->getParent()->getAnonymousStructOrUnionObject();
1620    if (!isa<FieldDecl>(VD)) break;
1621    Field = cast<FieldDecl>(VD);
1622    Path.push_back(Field);
1623  }
1624
1625  llvm::SmallVectorImpl<const FieldDecl*>::reverse_iterator
1626    I = Path.rbegin(), E = Path.rend();
1627  while (true) {
1628    LValue LV = EmitLValueForField(BaseValue, *I, CVRQualifiers);
1629    if (++I == E) return LV;
1630
1631    assert(LV.isSimple());
1632    BaseValue = LV.getAddress();
1633    CVRQualifiers |= LV.getVRQualifiers();
1634  }
1635}
1636
1637LValue CodeGenFunction::EmitLValueForField(llvm::Value *BaseValue,
1638                                           const FieldDecl *Field,
1639                                           unsigned CVRQualifiers) {
1640  if (Field->isBitField())
1641    return EmitLValueForBitfield(BaseValue, Field, CVRQualifiers);
1642
1643  const CGRecordLayout &RL =
1644    CGM.getTypes().getCGRecordLayout(Field->getParent());
1645  unsigned idx = RL.getLLVMFieldNo(Field);
1646  llvm::Value *V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
1647
1648  // Match union field type.
1649  if (Field->getParent()->isUnion()) {
1650    const llvm::Type *FieldTy =
1651      CGM.getTypes().ConvertTypeForMem(Field->getType());
1652    const llvm::PointerType *BaseTy =
1653      cast<llvm::PointerType>(BaseValue->getType());
1654    unsigned AS = BaseTy->getAddressSpace();
1655    V = Builder.CreateBitCast(V,
1656                              llvm::PointerType::get(FieldTy, AS),
1657                              "tmp");
1658  }
1659  if (Field->getType()->isReferenceType())
1660    V = Builder.CreateLoad(V, "tmp");
1661
1662  unsigned Alignment = getContext().getDeclAlign(Field).getQuantity();
1663  LValue LV = MakeAddrLValue(V, Field->getType(), Alignment);
1664  LV.getQuals().addCVRQualifiers(CVRQualifiers);
1665
1666  // __weak attribute on a field is ignored.
1667  if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
1668    LV.getQuals().removeObjCGCAttr();
1669
1670  return LV;
1671}
1672
1673LValue
1674CodeGenFunction::EmitLValueForFieldInitialization(llvm::Value *BaseValue,
1675                                                  const FieldDecl *Field,
1676                                                  unsigned CVRQualifiers) {
1677  QualType FieldType = Field->getType();
1678
1679  if (!FieldType->isReferenceType())
1680    return EmitLValueForField(BaseValue, Field, CVRQualifiers);
1681
1682  const CGRecordLayout &RL =
1683    CGM.getTypes().getCGRecordLayout(Field->getParent());
1684  unsigned idx = RL.getLLVMFieldNo(Field);
1685  llvm::Value *V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
1686
1687  assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
1688
1689  unsigned Alignment = getContext().getDeclAlign(Field).getQuantity();
1690  return MakeAddrLValue(V, FieldType, Alignment);
1691}
1692
1693LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
1694  llvm::Value *DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
1695  const Expr *InitExpr = E->getInitializer();
1696  LValue Result = MakeAddrLValue(DeclPtr, E->getType());
1697
1698  EmitAnyExprToMem(InitExpr, DeclPtr, /*Volatile*/ false, /*Init*/ true);
1699
1700  return Result;
1701}
1702
1703LValue
1704CodeGenFunction::EmitConditionalOperatorLValue(const ConditionalOperator *E) {
1705  if (E->isLvalue(getContext()) == Expr::LV_Valid) {
1706    if (int Cond = ConstantFoldsToSimpleInteger(E->getCond())) {
1707      Expr *Live = Cond == 1 ? E->getLHS() : E->getRHS();
1708      if (Live)
1709        return EmitLValue(Live);
1710    }
1711
1712    llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true");
1713    llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false");
1714    llvm::BasicBlock *ContBlock = createBasicBlock("cond.end");
1715
1716    if (E->getLHS())
1717      EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
1718    else {
1719      Expr *save = E->getSAVE();
1720      assert(save && "VisitConditionalOperator - save is null");
1721      // Intentianlly not doing direct assignment to ConditionalSaveExprs[save]
1722      LValue SaveVal = EmitLValue(save);
1723      ConditionalSaveLValueExprs[save] = SaveVal;
1724      EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
1725    }
1726
1727    // Any temporaries created here are conditional.
1728    BeginConditionalBranch();
1729    EmitBlock(LHSBlock);
1730    LValue LHS = EmitLValue(E->getTrueExpr());
1731
1732    EndConditionalBranch();
1733
1734    if (!LHS.isSimple())
1735      return EmitUnsupportedLValue(E, "conditional operator");
1736
1737    // FIXME: We shouldn't need an alloca for this.
1738    llvm::Value *Temp = CreateTempAlloca(LHS.getAddress()->getType(),"condtmp");
1739    Builder.CreateStore(LHS.getAddress(), Temp);
1740    EmitBranch(ContBlock);
1741
1742    // Any temporaries created here are conditional.
1743    BeginConditionalBranch();
1744    EmitBlock(RHSBlock);
1745    LValue RHS = EmitLValue(E->getRHS());
1746    EndConditionalBranch();
1747    if (!RHS.isSimple())
1748      return EmitUnsupportedLValue(E, "conditional operator");
1749
1750    Builder.CreateStore(RHS.getAddress(), Temp);
1751    EmitBranch(ContBlock);
1752
1753    EmitBlock(ContBlock);
1754
1755    Temp = Builder.CreateLoad(Temp, "lv");
1756    return MakeAddrLValue(Temp, E->getType());
1757  }
1758
1759  // ?: here should be an aggregate.
1760  assert((hasAggregateLLVMType(E->getType()) &&
1761          !E->getType()->isAnyComplexType()) &&
1762         "Unexpected conditional operator!");
1763
1764  return EmitAggExprToLValue(E);
1765}
1766
1767/// EmitCastLValue - Casts are never lvalues unless that cast is a dynamic_cast.
1768/// If the cast is a dynamic_cast, we can have the usual lvalue result,
1769/// otherwise if a cast is needed by the code generator in an lvalue context,
1770/// then it must mean that we need the address of an aggregate in order to
1771/// access one of its fields.  This can happen for all the reasons that casts
1772/// are permitted with aggregate result, including noop aggregate casts, and
1773/// cast from scalar to union.
1774LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
1775  switch (E->getCastKind()) {
1776  case CK_ToVoid:
1777    return EmitUnsupportedLValue(E, "unexpected cast lvalue");
1778
1779  case CK_NoOp:
1780    if (E->getSubExpr()->Classify(getContext()).getKind()
1781                                          != Expr::Classification::CL_PRValue) {
1782      LValue LV = EmitLValue(E->getSubExpr());
1783      if (LV.isPropertyRef() || LV.isKVCRef()) {
1784        QualType QT = E->getSubExpr()->getType();
1785        RValue RV =
1786          LV.isPropertyRef() ? EmitLoadOfPropertyRefLValue(LV, QT)
1787                             : EmitLoadOfKVCRefLValue(LV, QT);
1788        assert(!RV.isScalar() && "EmitCastLValue-scalar cast of property ref");
1789        llvm::Value *V = RV.getAggregateAddr();
1790        return MakeAddrLValue(V, QT);
1791      }
1792      return LV;
1793    }
1794    // Fall through to synthesize a temporary.
1795
1796  case CK_Unknown:
1797  case CK_BitCast:
1798  case CK_ArrayToPointerDecay:
1799  case CK_FunctionToPointerDecay:
1800  case CK_NullToMemberPointer:
1801  case CK_IntegralToPointer:
1802  case CK_PointerToIntegral:
1803  case CK_VectorSplat:
1804  case CK_IntegralCast:
1805  case CK_IntegralToFloating:
1806  case CK_FloatingToIntegral:
1807  case CK_FloatingCast:
1808  case CK_DerivedToBaseMemberPointer:
1809  case CK_BaseToDerivedMemberPointer:
1810  case CK_MemberPointerToBoolean:
1811  case CK_AnyPointerToBlockPointerCast: {
1812    // These casts only produce lvalues when we're binding a reference to a
1813    // temporary realized from a (converted) pure rvalue. Emit the expression
1814    // as a value, copy it into a temporary, and return an lvalue referring to
1815    // that temporary.
1816    llvm::Value *V = CreateMemTemp(E->getType(), "ref.temp");
1817    EmitAnyExprToMem(E, V, false, false);
1818    return MakeAddrLValue(V, E->getType());
1819  }
1820
1821  case CK_Dynamic: {
1822    LValue LV = EmitLValue(E->getSubExpr());
1823    llvm::Value *V = LV.getAddress();
1824    const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(E);
1825    return MakeAddrLValue(EmitDynamicCast(V, DCE), E->getType());
1826  }
1827
1828  case CK_ConstructorConversion:
1829  case CK_UserDefinedConversion:
1830  case CK_AnyPointerToObjCPointerCast:
1831    return EmitLValue(E->getSubExpr());
1832
1833  case CK_UncheckedDerivedToBase:
1834  case CK_DerivedToBase: {
1835    const RecordType *DerivedClassTy =
1836      E->getSubExpr()->getType()->getAs<RecordType>();
1837    CXXRecordDecl *DerivedClassDecl =
1838      cast<CXXRecordDecl>(DerivedClassTy->getDecl());
1839
1840    LValue LV = EmitLValue(E->getSubExpr());
1841    llvm::Value *This;
1842    if (LV.isPropertyRef() || LV.isKVCRef()) {
1843      QualType QT = E->getSubExpr()->getType();
1844      RValue RV =
1845        LV.isPropertyRef() ? EmitLoadOfPropertyRefLValue(LV, QT)
1846                           : EmitLoadOfKVCRefLValue(LV, QT);
1847      assert (!RV.isScalar() && "EmitCastLValue");
1848      This = RV.getAggregateAddr();
1849    }
1850    else
1851      This = LV.getAddress();
1852
1853    // Perform the derived-to-base conversion
1854    llvm::Value *Base =
1855      GetAddressOfBaseClass(This, DerivedClassDecl,
1856                            E->path_begin(), E->path_end(),
1857                            /*NullCheckValue=*/false);
1858
1859    return MakeAddrLValue(Base, E->getType());
1860  }
1861  case CK_ToUnion:
1862    return EmitAggExprToLValue(E);
1863  case CK_BaseToDerived: {
1864    const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
1865    CXXRecordDecl *DerivedClassDecl =
1866      cast<CXXRecordDecl>(DerivedClassTy->getDecl());
1867
1868    LValue LV = EmitLValue(E->getSubExpr());
1869
1870    // Perform the base-to-derived conversion
1871    llvm::Value *Derived =
1872      GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
1873                               E->path_begin(), E->path_end(),
1874                               /*NullCheckValue=*/false);
1875
1876    return MakeAddrLValue(Derived, E->getType());
1877  }
1878  case CK_LValueBitCast: {
1879    // This must be a reinterpret_cast (or c-style equivalent).
1880    const ExplicitCastExpr *CE = cast<ExplicitCastExpr>(E);
1881
1882    LValue LV = EmitLValue(E->getSubExpr());
1883    llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
1884                                           ConvertType(CE->getTypeAsWritten()));
1885    return MakeAddrLValue(V, E->getType());
1886  }
1887  case CK_ObjCObjectLValueCast: {
1888    LValue LV = EmitLValue(E->getSubExpr());
1889    QualType ToType = getContext().getLValueReferenceType(E->getType());
1890    llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
1891                                           ConvertType(ToType));
1892    return MakeAddrLValue(V, E->getType());
1893  }
1894  }
1895
1896  llvm_unreachable("Unhandled lvalue cast kind?");
1897}
1898
1899LValue CodeGenFunction::EmitNullInitializationLValue(
1900                                              const CXXScalarValueInitExpr *E) {
1901  QualType Ty = E->getType();
1902  LValue LV = MakeAddrLValue(CreateMemTemp(Ty), Ty);
1903  EmitNullInitialization(LV.getAddress(), Ty);
1904  return LV;
1905}
1906
1907//===--------------------------------------------------------------------===//
1908//                             Expression Emission
1909//===--------------------------------------------------------------------===//
1910
1911
1912RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
1913                                     ReturnValueSlot ReturnValue) {
1914  // Builtins never have block type.
1915  if (E->getCallee()->getType()->isBlockPointerType())
1916    return EmitBlockCallExpr(E, ReturnValue);
1917
1918  if (const CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(E))
1919    return EmitCXXMemberCallExpr(CE, ReturnValue);
1920
1921  const Decl *TargetDecl = 0;
1922  if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(E->getCallee())) {
1923    if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CE->getSubExpr())) {
1924      TargetDecl = DRE->getDecl();
1925      if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(TargetDecl))
1926        if (unsigned builtinID = FD->getBuiltinID())
1927          return EmitBuiltinExpr(FD, builtinID, E);
1928    }
1929  }
1930
1931  if (const CXXOperatorCallExpr *CE = dyn_cast<CXXOperatorCallExpr>(E))
1932    if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(TargetDecl))
1933      return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
1934
1935  if (isa<CXXPseudoDestructorExpr>(E->getCallee()->IgnoreParens())) {
1936    // C++ [expr.pseudo]p1:
1937    //   The result shall only be used as the operand for the function call
1938    //   operator (), and the result of such a call has type void. The only
1939    //   effect is the evaluation of the postfix-expression before the dot or
1940    //   arrow.
1941    EmitScalarExpr(E->getCallee());
1942    return RValue::get(0);
1943  }
1944
1945  llvm::Value *Callee = EmitScalarExpr(E->getCallee());
1946  return EmitCall(E->getCallee()->getType(), Callee, ReturnValue,
1947                  E->arg_begin(), E->arg_end(), TargetDecl);
1948}
1949
1950LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
1951  // Comma expressions just emit their LHS then their RHS as an l-value.
1952  if (E->getOpcode() == BO_Comma) {
1953    EmitAnyExpr(E->getLHS());
1954    EnsureInsertPoint();
1955    return EmitLValue(E->getRHS());
1956  }
1957
1958  if (E->getOpcode() == BO_PtrMemD ||
1959      E->getOpcode() == BO_PtrMemI)
1960    return EmitPointerToDataMemberBinaryExpr(E);
1961
1962  // Can only get l-value for binary operator expressions which are a
1963  // simple assignment of aggregate type.
1964  if (E->getOpcode() != BO_Assign)
1965    return EmitUnsupportedLValue(E, "binary l-value expression");
1966
1967  if (!hasAggregateLLVMType(E->getType())) {
1968    // Emit the LHS as an l-value.
1969    LValue LV = EmitLValue(E->getLHS());
1970    // Store the value through the l-value.
1971    EmitStoreThroughLValue(EmitAnyExpr(E->getRHS()), LV, E->getType());
1972    return LV;
1973  }
1974
1975  return EmitAggExprToLValue(E);
1976}
1977
1978LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
1979  RValue RV = EmitCallExpr(E);
1980
1981  if (!RV.isScalar())
1982    return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
1983
1984  assert(E->getCallReturnType()->isReferenceType() &&
1985         "Can't have a scalar return unless the return type is a "
1986         "reference type!");
1987
1988  return MakeAddrLValue(RV.getScalarVal(), E->getType());
1989}
1990
1991LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
1992  // FIXME: This shouldn't require another copy.
1993  return EmitAggExprToLValue(E);
1994}
1995
1996LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
1997  assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()
1998         && "binding l-value to type which needs a temporary");
1999  AggValueSlot Slot = CreateAggTemp(E->getType(), "tmp");
2000  EmitCXXConstructExpr(E, Slot);
2001  return MakeAddrLValue(Slot.getAddr(), E->getType());
2002}
2003
2004LValue
2005CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
2006  return MakeAddrLValue(EmitCXXTypeidExpr(E), E->getType());
2007}
2008
2009LValue
2010CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
2011  AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
2012  Slot.setLifetimeExternallyManaged();
2013  EmitAggExpr(E->getSubExpr(), Slot);
2014  EmitCXXTemporary(E->getTemporary(), Slot.getAddr());
2015  return MakeAddrLValue(Slot.getAddr(), E->getType());
2016}
2017
2018LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
2019  RValue RV = EmitObjCMessageExpr(E);
2020
2021  if (!RV.isScalar())
2022    return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
2023
2024  assert(E->getMethodDecl()->getResultType()->isReferenceType() &&
2025         "Can't have a scalar return unless the return type is a "
2026         "reference type!");
2027
2028  return MakeAddrLValue(RV.getScalarVal(), E->getType());
2029}
2030
2031LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
2032  llvm::Value *V =
2033    CGM.getObjCRuntime().GetSelector(Builder, E->getSelector(), true);
2034  return MakeAddrLValue(V, E->getType());
2035}
2036
2037llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
2038                                             const ObjCIvarDecl *Ivar) {
2039  return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
2040}
2041
2042LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
2043                                          llvm::Value *BaseValue,
2044                                          const ObjCIvarDecl *Ivar,
2045                                          unsigned CVRQualifiers) {
2046  return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
2047                                                   Ivar, CVRQualifiers);
2048}
2049
2050LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
2051  // FIXME: A lot of the code below could be shared with EmitMemberExpr.
2052  llvm::Value *BaseValue = 0;
2053  const Expr *BaseExpr = E->getBase();
2054  Qualifiers BaseQuals;
2055  QualType ObjectTy;
2056  if (E->isArrow()) {
2057    BaseValue = EmitScalarExpr(BaseExpr);
2058    ObjectTy = BaseExpr->getType()->getPointeeType();
2059    BaseQuals = ObjectTy.getQualifiers();
2060  } else {
2061    LValue BaseLV = EmitLValue(BaseExpr);
2062    // FIXME: this isn't right for bitfields.
2063    BaseValue = BaseLV.getAddress();
2064    ObjectTy = BaseExpr->getType();
2065    BaseQuals = ObjectTy.getQualifiers();
2066  }
2067
2068  LValue LV =
2069    EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
2070                      BaseQuals.getCVRQualifiers());
2071  setObjCGCLValueClass(getContext(), E, LV);
2072  return LV;
2073}
2074
2075LValue
2076CodeGenFunction::EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E) {
2077  // This is a special l-value that just issues sends when we load or store
2078  // through it.
2079  return LValue::MakePropertyRef(E, E->getType().getCVRQualifiers());
2080}
2081
2082LValue CodeGenFunction::EmitObjCKVCRefLValue(
2083                                const ObjCImplicitSetterGetterRefExpr *E) {
2084  // This is a special l-value that just issues sends when we load or store
2085  // through it.
2086  return LValue::MakeKVCRef(E, E->getType().getCVRQualifiers());
2087}
2088
2089LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
2090  // Can only get l-value for message expression returning aggregate type
2091  RValue RV = EmitAnyExprToTemp(E);
2092  return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
2093}
2094
2095RValue CodeGenFunction::EmitCall(QualType CalleeType, llvm::Value *Callee,
2096                                 ReturnValueSlot ReturnValue,
2097                                 CallExpr::const_arg_iterator ArgBeg,
2098                                 CallExpr::const_arg_iterator ArgEnd,
2099                                 const Decl *TargetDecl) {
2100  // Get the actual function type. The callee type will always be a pointer to
2101  // function type or a block pointer type.
2102  assert(CalleeType->isFunctionPointerType() &&
2103         "Call must have function pointer type!");
2104
2105  CalleeType = getContext().getCanonicalType(CalleeType);
2106
2107  const FunctionType *FnType
2108    = cast<FunctionType>(cast<PointerType>(CalleeType)->getPointeeType());
2109  QualType ResultType = FnType->getResultType();
2110
2111  CallArgList Args;
2112  EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), ArgBeg, ArgEnd);
2113
2114  return EmitCall(CGM.getTypes().getFunctionInfo(Args, FnType),
2115                  Callee, ReturnValue, Args, TargetDecl);
2116}
2117
2118LValue CodeGenFunction::
2119EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
2120  llvm::Value *BaseV;
2121  if (E->getOpcode() == BO_PtrMemI)
2122    BaseV = EmitScalarExpr(E->getLHS());
2123  else
2124    BaseV = EmitLValue(E->getLHS()).getAddress();
2125
2126  llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
2127
2128  const MemberPointerType *MPT
2129    = E->getRHS()->getType()->getAs<MemberPointerType>();
2130
2131  llvm::Value *AddV =
2132    CGM.getCXXABI().EmitMemberDataPointerAddress(*this, BaseV, OffsetV, MPT);
2133
2134  return MakeAddrLValue(AddV, MPT->getPointeeType());
2135}
2136
2137