CGExpr.cpp revision f63aa3fd429cdb9145d78f0b656bc78754efedb9 
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 "CGObjCRuntime.h"
18#include "clang/AST/ASTContext.h"
19#include "clang/AST/DeclObjC.h"
20#include "llvm/Target/TargetData.h"
21using namespace clang;
22using namespace CodeGen;
23
24//===--------------------------------------------------------------------===//
25//                        Miscellaneous Helper Methods
26//===--------------------------------------------------------------------===//
27
28/// CreateTempAlloca - This creates a alloca and inserts it into the entry
29/// block.
30llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(const llvm::Type *Ty,
31                                                    const char *Name) {
32  return new llvm::AllocaInst(Ty, 0, Name, AllocaInsertPt);
33}
34
35/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
36/// expression and compare the result against zero, returning an Int1Ty value.
37llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
38  QualType BoolTy = getContext().BoolTy;
39  if (!E->getType()->isAnyComplexType())
40    return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy);
41
42  return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(),BoolTy);
43}
44
45/// EmitAnyExpr - Emit code to compute the specified expression which can have
46/// any type.  The result is returned as an RValue struct.  If this is an
47/// aggregate expression, the aggloc/agglocvolatile arguments indicate where
48/// the result should be returned.
49RValue CodeGenFunction::EmitAnyExpr(const Expr *E, llvm::Value *AggLoc,
50                                    bool isAggLocVolatile) {
51  if (!hasAggregateLLVMType(E->getType()))
52    return RValue::get(EmitScalarExpr(E));
53  else if (E->getType()->isAnyComplexType())
54    return RValue::getComplex(EmitComplexExpr(E));
55
56  EmitAggExpr(E, AggLoc, isAggLocVolatile);
57  return RValue::getAggregate(AggLoc);
58}
59
60/// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result
61/// will always be accessible even if no aggregate location is
62/// provided.
63RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E, llvm::Value *AggLoc,
64                                          bool isAggLocVolatile) {
65  if (!AggLoc && hasAggregateLLVMType(E->getType()) &&
66      !E->getType()->isAnyComplexType())
67    AggLoc = CreateTempAlloca(ConvertType(E->getType()), "agg.tmp");
68  return EmitAnyExpr(E, AggLoc, isAggLocVolatile);
69}
70
71/// getAccessedFieldNo - Given an encoded value and a result number, return
72/// the input field number being accessed.
73unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
74                                             const llvm::Constant *Elts) {
75  if (isa<llvm::ConstantAggregateZero>(Elts))
76    return 0;
77
78  return cast<llvm::ConstantInt>(Elts->getOperand(Idx))->getZExtValue();
79}
80
81
82//===----------------------------------------------------------------------===//
83//                         LValue Expression Emission
84//===----------------------------------------------------------------------===//
85
86RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
87  if (Ty->isVoidType()) {
88    return RValue::get(0);
89  } else if (const ComplexType *CTy = Ty->getAsComplexType()) {
90    const llvm::Type *EltTy = ConvertType(CTy->getElementType());
91    llvm::Value *U = llvm::UndefValue::get(EltTy);
92    return RValue::getComplex(std::make_pair(U, U));
93  } else if (hasAggregateLLVMType(Ty)) {
94    const llvm::Type *LTy = llvm::PointerType::getUnqual(ConvertType(Ty));
95    return RValue::getAggregate(llvm::UndefValue::get(LTy));
96  } else {
97    return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
98  }
99}
100
101RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
102                                              const char *Name) {
103  ErrorUnsupported(E, Name);
104  return GetUndefRValue(E->getType());
105}
106
107LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
108                                              const char *Name) {
109  ErrorUnsupported(E, Name);
110  llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
111  return LValue::MakeAddr(llvm::UndefValue::get(Ty),
112                          E->getType().getCVRQualifiers());
113}
114
115/// EmitLValue - Emit code to compute a designator that specifies the location
116/// of the expression.
117///
118/// This can return one of two things: a simple address or a bitfield
119/// reference.  In either case, the LLVM Value* in the LValue structure is
120/// guaranteed to be an LLVM pointer type.
121///
122/// If this returns a bitfield reference, nothing about the pointee type of
123/// the LLVM value is known: For example, it may not be a pointer to an
124/// integer.
125///
126/// If this returns a normal address, and if the lvalue's C type is fixed
127/// size, this method guarantees that the returned pointer type will point to
128/// an LLVM type of the same size of the lvalue's type.  If the lvalue has a
129/// variable length type, this is not possible.
130///
131LValue CodeGenFunction::EmitLValue(const Expr *E) {
132  switch (E->getStmtClass()) {
133  default: return EmitUnsupportedLValue(E, "l-value expression");
134
135  case Expr::BinaryOperatorClass:
136    return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
137  case Expr::CallExprClass:
138  case Expr::CXXOperatorCallExprClass:
139    return EmitCallExprLValue(cast<CallExpr>(E));
140  case Expr::DeclRefExprClass:
141  case Expr::QualifiedDeclRefExprClass:
142    return EmitDeclRefLValue(cast<DeclRefExpr>(E));
143  case Expr::ParenExprClass:return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
144  case Expr::PredefinedExprClass:
145    return EmitPredefinedLValue(cast<PredefinedExpr>(E));
146  case Expr::StringLiteralClass:
147    return EmitStringLiteralLValue(cast<StringLiteral>(E));
148
149  case Expr::CXXConditionDeclExprClass:
150    return EmitCXXConditionDeclLValue(cast<CXXConditionDeclExpr>(E));
151
152  case Expr::ObjCMessageExprClass:
153    return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
154  case Expr::ObjCIvarRefExprClass:
155    return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
156  case Expr::ObjCPropertyRefExprClass:
157    return EmitObjCPropertyRefLValue(cast<ObjCPropertyRefExpr>(E));
158  case Expr::ObjCKVCRefExprClass:
159    return EmitObjCKVCRefLValue(cast<ObjCKVCRefExpr>(E));
160  case Expr::ObjCSuperExprClass:
161    return EmitObjCSuperExpr(cast<ObjCSuperExpr>(E));
162
163  case Expr::UnaryOperatorClass:
164    return EmitUnaryOpLValue(cast<UnaryOperator>(E));
165  case Expr::ArraySubscriptExprClass:
166    return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
167  case Expr::ExtVectorElementExprClass:
168    return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
169  case Expr::MemberExprClass: return EmitMemberExpr(cast<MemberExpr>(E));
170  case Expr::CompoundLiteralExprClass:
171    return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
172  case Expr::ChooseExprClass:
173    // __builtin_choose_expr is the lvalue of the selected operand.
174    if (cast<ChooseExpr>(E)->isConditionTrue(getContext()))
175      return EmitLValue(cast<ChooseExpr>(E)->getLHS());
176    else
177      return EmitLValue(cast<ChooseExpr>(E)->getRHS());
178  }
179}
180
181llvm::Value *CodeGenFunction::EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
182                                               QualType Ty) {
183  llvm::Value *V = Builder.CreateLoad(Addr, Volatile, "tmp");
184
185  // Bool can have different representation in memory than in
186  // registers.
187  if (Ty->isBooleanType())
188    if (V->getType() != llvm::Type::Int1Ty)
189      V = Builder.CreateTrunc(V, llvm::Type::Int1Ty, "tobool");
190
191  return V;
192}
193
194void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
195                                        bool Volatile) {
196  // Handle stores of types which have different representations in
197  // memory and as LLVM values.
198
199  // FIXME: We shouldn't be this loose, we should only do this
200  // conversion when we have a type we know has a different memory
201  // representation (e.g., bool).
202
203  const llvm::Type *SrcTy = Value->getType();
204  const llvm::PointerType *DstPtr = cast<llvm::PointerType>(Addr->getType());
205  if (DstPtr->getElementType() != SrcTy) {
206    const llvm::Type *MemTy =
207      llvm::PointerType::get(SrcTy, DstPtr->getAddressSpace());
208    Addr = Builder.CreateBitCast(Addr, MemTy, "storetmp");
209  }
210
211  Builder.CreateStore(Value, Addr, Volatile);
212}
213
214/// EmitLoadOfLValue - Given an expression that represents a value lvalue,
215/// this method emits the address of the lvalue, then loads the result as an
216/// rvalue, returning the rvalue.
217RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, QualType ExprType) {
218  if (LV.isObjCWeak()) {
219    // load of a __weak object.
220    llvm::Value *AddrWeakObj = LV.getAddress();
221    llvm::Value *read_weak = CGM.getObjCRuntime().EmitObjCWeakRead(*this,
222                                                                   AddrWeakObj);
223    return RValue::get(read_weak);
224  }
225
226  if (LV.isSimple()) {
227    llvm::Value *Ptr = LV.getAddress();
228    const llvm::Type *EltTy =
229      cast<llvm::PointerType>(Ptr->getType())->getElementType();
230
231    // Simple scalar l-value.
232    if (EltTy->isSingleValueType())
233      return RValue::get(EmitLoadOfScalar(Ptr, LV.isVolatileQualified(),
234                                          ExprType));
235
236    assert(ExprType->isFunctionType() && "Unknown scalar value");
237    return RValue::get(Ptr);
238  }
239
240  if (LV.isVectorElt()) {
241    llvm::Value *Vec = Builder.CreateLoad(LV.getVectorAddr(),
242                                          LV.isVolatileQualified(), "tmp");
243    return RValue::get(Builder.CreateExtractElement(Vec, LV.getVectorIdx(),
244                                                    "vecext"));
245  }
246
247  // If this is a reference to a subset of the elements of a vector, either
248  // shuffle the input or extract/insert them as appropriate.
249  if (LV.isExtVectorElt())
250    return EmitLoadOfExtVectorElementLValue(LV, ExprType);
251
252  if (LV.isBitfield())
253    return EmitLoadOfBitfieldLValue(LV, ExprType);
254
255  if (LV.isPropertyRef())
256    return EmitLoadOfPropertyRefLValue(LV, ExprType);
257
258  if (LV.isKVCRef())
259    return EmitLoadOfKVCRefLValue(LV, ExprType);
260
261  assert(0 && "Unknown LValue type!");
262  //an invalid RValue, but the assert will
263  //ensure that this point is never reached
264  return RValue();
265}
266
267RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
268                                                 QualType ExprType) {
269  unsigned StartBit = LV.getBitfieldStartBit();
270  unsigned BitfieldSize = LV.getBitfieldSize();
271  llvm::Value *Ptr = LV.getBitfieldAddr();
272
273  const llvm::Type *EltTy =
274    cast<llvm::PointerType>(Ptr->getType())->getElementType();
275  unsigned EltTySize = CGM.getTargetData().getTypeSizeInBits(EltTy);
276
277  // In some cases the bitfield may straddle two memory locations.
278  // Currently we load the entire bitfield, then do the magic to
279  // sign-extend it if necessary. This results in somewhat more code
280  // than necessary for the common case (one load), since two shifts
281  // accomplish both the masking and sign extension.
282  unsigned LowBits = std::min(BitfieldSize, EltTySize - StartBit);
283  llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "tmp");
284
285  // Shift to proper location.
286  if (StartBit)
287    Val = Builder.CreateLShr(Val, llvm::ConstantInt::get(EltTy, StartBit),
288                             "bf.lo");
289
290  // Mask off unused bits.
291  llvm::Constant *LowMask =
292    llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, LowBits));
293  Val = Builder.CreateAnd(Val, LowMask, "bf.lo.cleared");
294
295  // Fetch the high bits if necessary.
296  if (LowBits < BitfieldSize) {
297    unsigned HighBits = BitfieldSize - LowBits;
298    llvm::Value *HighPtr =
299      Builder.CreateGEP(Ptr, llvm::ConstantInt::get(llvm::Type::Int32Ty, 1),
300                        "bf.ptr.hi");
301    llvm::Value *HighVal = Builder.CreateLoad(HighPtr,
302                                              LV.isVolatileQualified(),
303                                              "tmp");
304
305    // Mask off unused bits.
306    llvm::Constant *HighMask =
307      llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, HighBits));
308    HighVal = Builder.CreateAnd(HighVal, HighMask, "bf.lo.cleared");
309
310    // Shift to proper location and or in to bitfield value.
311    HighVal = Builder.CreateShl(HighVal,
312                                llvm::ConstantInt::get(EltTy, LowBits));
313    Val = Builder.CreateOr(Val, HighVal, "bf.val");
314  }
315
316  // Sign extend if necessary.
317  if (LV.isBitfieldSigned()) {
318    llvm::Value *ExtraBits = llvm::ConstantInt::get(EltTy,
319                                                    EltTySize - BitfieldSize);
320    Val = Builder.CreateAShr(Builder.CreateShl(Val, ExtraBits),
321                             ExtraBits, "bf.val.sext");
322  }
323
324  // The bitfield type and the normal type differ when the storage sizes
325  // differ (currently just _Bool).
326  Val = Builder.CreateIntCast(Val, ConvertType(ExprType), false, "tmp");
327
328  return RValue::get(Val);
329}
330
331RValue CodeGenFunction::EmitLoadOfPropertyRefLValue(LValue LV,
332                                                    QualType ExprType) {
333  return EmitObjCPropertyGet(LV.getPropertyRefExpr());
334}
335
336RValue CodeGenFunction::EmitLoadOfKVCRefLValue(LValue LV,
337                                               QualType ExprType) {
338  return EmitObjCPropertyGet(LV.getKVCRefExpr());
339}
340
341// If this is a reference to a subset of the elements of a vector, create an
342// appropriate shufflevector.
343RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV,
344                                                         QualType ExprType) {
345  llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddr(),
346                                        LV.isVolatileQualified(), "tmp");
347
348  const llvm::Constant *Elts = LV.getExtVectorElts();
349
350  // If the result of the expression is a non-vector type, we must be
351  // extracting a single element.  Just codegen as an extractelement.
352  const VectorType *ExprVT = ExprType->getAsVectorType();
353  if (!ExprVT) {
354    unsigned InIdx = getAccessedFieldNo(0, Elts);
355    llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
356    return RValue::get(Builder.CreateExtractElement(Vec, Elt, "tmp"));
357  }
358
359  // Always use shuffle vector to try to retain the original program structure
360  unsigned NumResultElts = ExprVT->getNumElements();
361
362  llvm::SmallVector<llvm::Constant*, 4> Mask;
363  for (unsigned i = 0; i != NumResultElts; ++i) {
364    unsigned InIdx = getAccessedFieldNo(i, Elts);
365    Mask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx));
366  }
367
368  llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
369  Vec = Builder.CreateShuffleVector(Vec,
370                                    llvm::UndefValue::get(Vec->getType()),
371                                    MaskV, "tmp");
372  return RValue::get(Vec);
373}
374
375
376
377/// EmitStoreThroughLValue - Store the specified rvalue into the specified
378/// lvalue, where both are guaranteed to the have the same type, and that type
379/// is 'Ty'.
380void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
381                                             QualType Ty) {
382  if (!Dst.isSimple()) {
383    if (Dst.isVectorElt()) {
384      // Read/modify/write the vector, inserting the new element.
385      llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddr(),
386                                            Dst.isVolatileQualified(), "tmp");
387      Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
388                                        Dst.getVectorIdx(), "vecins");
389      Builder.CreateStore(Vec, Dst.getVectorAddr(),Dst.isVolatileQualified());
390      return;
391    }
392
393    // If this is an update of extended vector elements, insert them as
394    // appropriate.
395    if (Dst.isExtVectorElt())
396      return EmitStoreThroughExtVectorComponentLValue(Src, Dst, Ty);
397
398    if (Dst.isBitfield())
399      return EmitStoreThroughBitfieldLValue(Src, Dst, Ty);
400
401    if (Dst.isPropertyRef())
402      return EmitStoreThroughPropertyRefLValue(Src, Dst, Ty);
403
404    if (Dst.isKVCRef())
405      return EmitStoreThroughKVCRefLValue(Src, Dst, Ty);
406
407    assert(0 && "Unknown LValue type");
408  }
409
410  if (Dst.isObjCWeak()) {
411    // load of a __weak object.
412    llvm::Value *LvalueDst = Dst.getAddress();
413    llvm::Value *src = Src.getScalarVal();
414    CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
415    return;
416  }
417
418  if (Dst.isObjCStrong()) {
419    // load of a __strong object.
420    llvm::Value *LvalueDst = Dst.getAddress();
421    llvm::Value *src = Src.getScalarVal();
422    if (Dst.isObjCIvar())
423      CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, LvalueDst);
424    else
425      CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst);
426    return;
427  }
428
429  assert(Src.isScalar() && "Can't emit an agg store with this method");
430  EmitStoreOfScalar(Src.getScalarVal(), Dst.getAddress(),
431                    Dst.isVolatileQualified());
432}
433
434void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
435                                                     QualType Ty,
436                                                     llvm::Value **Result) {
437  unsigned StartBit = Dst.getBitfieldStartBit();
438  unsigned BitfieldSize = Dst.getBitfieldSize();
439  llvm::Value *Ptr = Dst.getBitfieldAddr();
440
441  const llvm::Type *EltTy =
442    cast<llvm::PointerType>(Ptr->getType())->getElementType();
443  unsigned EltTySize = CGM.getTargetData().getTypeSizeInBits(EltTy);
444
445  // Get the new value, cast to the appropriate type and masked to
446  // exactly the size of the bit-field.
447  llvm::Value *SrcVal = Src.getScalarVal();
448  llvm::Value *NewVal = Builder.CreateIntCast(SrcVal, EltTy, false, "tmp");
449  llvm::Constant *Mask =
450    llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, BitfieldSize));
451  NewVal = Builder.CreateAnd(NewVal, Mask, "bf.value");
452
453  // Return the new value of the bit-field, if requested.
454  if (Result) {
455    // Cast back to the proper type for result.
456    const llvm::Type *SrcTy = SrcVal->getType();
457    llvm::Value *SrcTrunc = Builder.CreateIntCast(NewVal, SrcTy, false,
458                                                  "bf.reload.val");
459
460    // Sign extend if necessary.
461    if (Dst.isBitfieldSigned()) {
462      unsigned SrcTySize = CGM.getTargetData().getTypeSizeInBits(SrcTy);
463      llvm::Value *ExtraBits = llvm::ConstantInt::get(SrcTy,
464                                                      SrcTySize - BitfieldSize);
465      SrcTrunc = Builder.CreateAShr(Builder.CreateShl(SrcTrunc, ExtraBits),
466                                    ExtraBits, "bf.reload.sext");
467    }
468
469    *Result = SrcTrunc;
470  }
471
472  // In some cases the bitfield may straddle two memory locations.
473  // Emit the low part first and check to see if the high needs to be
474  // done.
475  unsigned LowBits = std::min(BitfieldSize, EltTySize - StartBit);
476  llvm::Value *LowVal = Builder.CreateLoad(Ptr, Dst.isVolatileQualified(),
477                                           "bf.prev.low");
478
479  // Compute the mask for zero-ing the low part of this bitfield.
480  llvm::Constant *InvMask =
481    llvm::ConstantInt::get(~llvm::APInt::getBitsSet(EltTySize, StartBit,
482                                                    StartBit + LowBits));
483
484  // Compute the new low part as
485  //   LowVal = (LowVal & InvMask) | (NewVal << StartBit),
486  // with the shift of NewVal implicitly stripping the high bits.
487  llvm::Value *NewLowVal =
488    Builder.CreateShl(NewVal, llvm::ConstantInt::get(EltTy, StartBit),
489                      "bf.value.lo");
490  LowVal = Builder.CreateAnd(LowVal, InvMask, "bf.prev.lo.cleared");
491  LowVal = Builder.CreateOr(LowVal, NewLowVal, "bf.new.lo");
492
493  // Write back.
494  Builder.CreateStore(LowVal, Ptr, Dst.isVolatileQualified());
495
496  // If the low part doesn't cover the bitfield emit a high part.
497  if (LowBits < BitfieldSize) {
498    unsigned HighBits = BitfieldSize - LowBits;
499    llvm::Value *HighPtr =
500      Builder.CreateGEP(Ptr, llvm::ConstantInt::get(llvm::Type::Int32Ty, 1),
501                        "bf.ptr.hi");
502    llvm::Value *HighVal = Builder.CreateLoad(HighPtr,
503                                              Dst.isVolatileQualified(),
504                                              "bf.prev.hi");
505
506    // Compute the mask for zero-ing the high part of this bitfield.
507    llvm::Constant *InvMask =
508      llvm::ConstantInt::get(~llvm::APInt::getLowBitsSet(EltTySize, HighBits));
509
510    // Compute the new high part as
511    //   HighVal = (HighVal & InvMask) | (NewVal lshr LowBits),
512    // where the high bits of NewVal have already been cleared and the
513    // shift stripping the low bits.
514    llvm::Value *NewHighVal =
515      Builder.CreateLShr(NewVal, llvm::ConstantInt::get(EltTy, LowBits),
516                        "bf.value.high");
517    HighVal = Builder.CreateAnd(HighVal, InvMask, "bf.prev.hi.cleared");
518    HighVal = Builder.CreateOr(HighVal, NewHighVal, "bf.new.hi");
519
520    // Write back.
521    Builder.CreateStore(HighVal, HighPtr, Dst.isVolatileQualified());
522  }
523}
524
525void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src,
526                                                        LValue Dst,
527                                                        QualType Ty) {
528  EmitObjCPropertySet(Dst.getPropertyRefExpr(), Src);
529}
530
531void CodeGenFunction::EmitStoreThroughKVCRefLValue(RValue Src,
532                                                   LValue Dst,
533                                                   QualType Ty) {
534  EmitObjCPropertySet(Dst.getKVCRefExpr(), Src);
535}
536
537void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
538                                                               LValue Dst,
539                                                               QualType Ty) {
540  // This access turns into a read/modify/write of the vector.  Load the input
541  // value now.
542  llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddr(),
543                                        Dst.isVolatileQualified(), "tmp");
544  const llvm::Constant *Elts = Dst.getExtVectorElts();
545
546  llvm::Value *SrcVal = Src.getScalarVal();
547
548  if (const VectorType *VTy = Ty->getAsVectorType()) {
549    unsigned NumSrcElts = VTy->getNumElements();
550    unsigned NumDstElts =
551       cast<llvm::VectorType>(Vec->getType())->getNumElements();
552    if (NumDstElts == NumSrcElts) {
553      // Use shuffle vector is the src and destination are the same number
554      // of elements
555      llvm::SmallVector<llvm::Constant*, 4> Mask;
556      for (unsigned i = 0; i != NumSrcElts; ++i) {
557        unsigned InIdx = getAccessedFieldNo(i, Elts);
558        Mask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx));
559      }
560
561      llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
562      Vec = Builder.CreateShuffleVector(SrcVal,
563                                        llvm::UndefValue::get(Vec->getType()),
564                                        MaskV, "tmp");
565    }
566    else if (NumDstElts > NumSrcElts) {
567      // Extended the source vector to the same length and then shuffle it
568      // into the destination.
569      // FIXME: since we're shuffling with undef, can we just use the indices
570      //        into that?  This could be simpler.
571      llvm::SmallVector<llvm::Constant*, 4> ExtMask;
572      unsigned i;
573      for (i = 0; i != NumSrcElts; ++i)
574        ExtMask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, i));
575      for (; i != NumDstElts; ++i)
576        ExtMask.push_back(llvm::UndefValue::get(llvm::Type::Int32Ty));
577      llvm::Value *ExtMaskV = llvm::ConstantVector::get(&ExtMask[0],
578                                                        ExtMask.size());
579      llvm::Value *ExtSrcVal = Builder.CreateShuffleVector(SrcVal,
580                                        llvm::UndefValue::get(SrcVal->getType()),
581                                        ExtMaskV, "tmp");
582      // build identity
583      llvm::SmallVector<llvm::Constant*, 4> Mask;
584      for (unsigned i = 0; i != NumDstElts; ++i) {
585        Mask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, i));
586      }
587      // modify when what gets shuffled in
588      for (unsigned i = 0; i != NumSrcElts; ++i) {
589        unsigned Idx = getAccessedFieldNo(i, Elts);
590        Mask[Idx] =llvm::ConstantInt::get(llvm::Type::Int32Ty, i+NumDstElts);
591      }
592      llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
593      Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV, "tmp");
594    }
595    else {
596      // We should never shorten the vector
597      assert(0 && "unexpected shorten vector length");
598    }
599  } else {
600    // If the Src is a scalar (not a vector) it must be updating one element.
601    unsigned InIdx = getAccessedFieldNo(0, Elts);
602    llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
603    Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt, "tmp");
604  }
605
606  Builder.CreateStore(Vec, Dst.getExtVectorAddr(), Dst.isVolatileQualified());
607}
608
609/// SetVarDeclObjCAttribute - Set __weak/__strong attributes into the LValue
610/// object.
611static void SetVarDeclObjCAttribute(ASTContext &Ctx, const Decl *VD,
612                                    const QualType &Ty, LValue &LV)
613{
614  if (const ObjCGCAttr *A = VD->getAttr<ObjCGCAttr>()) {
615    ObjCGCAttr::GCAttrTypes attrType = A->getType();
616    LValue::SetObjCType(attrType == ObjCGCAttr::Weak,
617                        attrType == ObjCGCAttr::Strong, LV);
618  }
619  else if (Ctx.getLangOptions().ObjC1 &&
620           Ctx.getLangOptions().getGCMode() != LangOptions::NonGC) {
621    // Default behavious under objective-c's gc is for objective-c pointers
622    // be treated as though they were declared as __strong.
623    if (Ctx.isObjCObjectPointerType(Ty))
624      LValue::SetObjCType(false, true, LV);
625  }
626}
627
628LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
629  const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl());
630
631  if (VD && (VD->isBlockVarDecl() || isa<ParmVarDecl>(VD) ||
632        isa<ImplicitParamDecl>(VD))) {
633    LValue LV;
634    if (VD->getStorageClass() == VarDecl::Extern) {
635      LV = LValue::MakeAddr(CGM.GetAddrOfGlobalVar(VD),
636                            E->getType().getCVRQualifiers());
637    }
638    else {
639      llvm::Value *V = LocalDeclMap[VD];
640      assert(V && "BlockVarDecl not entered in LocalDeclMap?");
641      LV = LValue::MakeAddr(V, E->getType().getCVRQualifiers());
642    }
643    if (VD->isBlockVarDecl() &&
644        (VD->getStorageClass() == VarDecl::Static ||
645         VD->getStorageClass() == VarDecl::Extern))
646      SetVarDeclObjCAttribute(getContext(), VD, E->getType(), LV);
647    return LV;
648  } else if (VD && VD->isFileVarDecl()) {
649    LValue LV = LValue::MakeAddr(CGM.GetAddrOfGlobalVar(VD),
650                                 E->getType().getCVRQualifiers());
651    SetVarDeclObjCAttribute(getContext(), VD, E->getType(), LV);
652    return LV;
653  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) {
654    return LValue::MakeAddr(CGM.GetAddrOfFunction(FD),
655                            E->getType().getCVRQualifiers());
656  }
657  else if (const ImplicitParamDecl *IPD =
658      dyn_cast<ImplicitParamDecl>(E->getDecl())) {
659    llvm::Value *V = LocalDeclMap[IPD];
660    assert(V && "BlockVarDecl not entered in LocalDeclMap?");
661    return LValue::MakeAddr(V, E->getType().getCVRQualifiers());
662  }
663  assert(0 && "Unimp declref");
664  //an invalid LValue, but the assert will
665  //ensure that this point is never reached.
666  return LValue();
667}
668
669LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
670  // __extension__ doesn't affect lvalue-ness.
671  if (E->getOpcode() == UnaryOperator::Extension)
672    return EmitLValue(E->getSubExpr());
673
674  QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
675  switch (E->getOpcode()) {
676  default: assert(0 && "Unknown unary operator lvalue!");
677  case UnaryOperator::Deref:
678    return LValue::MakeAddr(EmitScalarExpr(E->getSubExpr()),
679                            ExprTy->getAsPointerType()->getPointeeType()
680                                    .getCVRQualifiers());
681  case UnaryOperator::Real:
682  case UnaryOperator::Imag:
683    LValue LV = EmitLValue(E->getSubExpr());
684    unsigned Idx = E->getOpcode() == UnaryOperator::Imag;
685    return LValue::MakeAddr(Builder.CreateStructGEP(LV.getAddress(),
686                                                    Idx, "idx"),
687                            ExprTy.getCVRQualifiers());
688  }
689}
690
691LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
692  return LValue::MakeAddr(CGM.GetAddrOfConstantStringFromLiteral(E), 0);
693}
694
695LValue CodeGenFunction::EmitPredefinedFunctionName(unsigned Type) {
696  std::string GlobalVarName;
697
698  switch (Type) {
699    default:
700      assert(0 && "Invalid type");
701    case PredefinedExpr::Func:
702      GlobalVarName = "__func__.";
703      break;
704    case PredefinedExpr::Function:
705      GlobalVarName = "__FUNCTION__.";
706      break;
707    case PredefinedExpr::PrettyFunction:
708      // FIXME:: Demangle C++ method names
709      GlobalVarName = "__PRETTY_FUNCTION__.";
710      break;
711  }
712
713  std::string FunctionName;
714  if(const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl)) {
715    FunctionName = FD->getNameAsString();
716  } else {
717    // Just get the mangled name.
718    FunctionName = CurFn->getName();
719  }
720
721  GlobalVarName += FunctionName;
722  llvm::Constant *C =
723    CGM.GetAddrOfConstantCString(FunctionName, GlobalVarName.c_str());
724  return LValue::MakeAddr(C, 0);
725}
726
727LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
728  switch (E->getIdentType()) {
729  default:
730    return EmitUnsupportedLValue(E, "predefined expression");
731  case PredefinedExpr::Func:
732  case PredefinedExpr::Function:
733  case PredefinedExpr::PrettyFunction:
734    return EmitPredefinedFunctionName(E->getIdentType());
735  }
736}
737
738LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E) {
739  // The index must always be an integer, which is not an aggregate.  Emit it.
740  llvm::Value *Idx = EmitScalarExpr(E->getIdx());
741
742  // If the base is a vector type, then we are forming a vector element lvalue
743  // with this subscript.
744  if (E->getBase()->getType()->isVectorType()) {
745    // Emit the vector as an lvalue to get its address.
746    LValue LHS = EmitLValue(E->getBase());
747    assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
748    // FIXME: This should properly sign/zero/extend or truncate Idx to i32.
749    return LValue::MakeVectorElt(LHS.getAddress(), Idx,
750      E->getBase()->getType().getCVRQualifiers());
751  }
752
753  // The base must be a pointer, which is not an aggregate.  Emit it.
754  llvm::Value *Base = EmitScalarExpr(E->getBase());
755
756  // Extend or truncate the index type to 32 or 64-bits.
757  QualType IdxTy  = E->getIdx()->getType();
758  bool IdxSigned = IdxTy->isSignedIntegerType();
759  unsigned IdxBitwidth = cast<llvm::IntegerType>(Idx->getType())->getBitWidth();
760  if (IdxBitwidth != LLVMPointerWidth)
761    Idx = Builder.CreateIntCast(Idx, llvm::IntegerType::get(LLVMPointerWidth),
762                                IdxSigned, "idxprom");
763
764  // We know that the pointer points to a type of the correct size, unless the
765  // size is a VLA.
766  if (const VariableArrayType *VAT =
767        getContext().getAsVariableArrayType(E->getType())) {
768    llvm::Value *VLASize = VLASizeMap[VAT];
769
770    Idx = Builder.CreateMul(Idx, VLASize);
771
772    QualType BaseType = getContext().getBaseElementType(VAT);
773
774    uint64_t BaseTypeSize = getContext().getTypeSize(BaseType) / 8;
775    Idx = Builder.CreateUDiv(Idx,
776                             llvm::ConstantInt::get(Idx->getType(),
777                                                    BaseTypeSize));
778  }
779
780  QualType ExprTy = getContext().getCanonicalType(E->getBase()->getType());
781
782  return LValue::MakeAddr(Builder.CreateGEP(Base, Idx, "arrayidx"),
783                          ExprTy->getAsPointerType()->getPointeeType()
784                               .getCVRQualifiers());
785}
786
787static
788llvm::Constant *GenerateConstantVector(llvm::SmallVector<unsigned, 4> &Elts) {
789  llvm::SmallVector<llvm::Constant *, 4> CElts;
790
791  for (unsigned i = 0, e = Elts.size(); i != e; ++i)
792    CElts.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, Elts[i]));
793
794  return llvm::ConstantVector::get(&CElts[0], CElts.size());
795}
796
797LValue CodeGenFunction::
798EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
799  // Emit the base vector as an l-value.
800  LValue Base = EmitLValue(E->getBase());
801
802  // Encode the element access list into a vector of unsigned indices.
803  llvm::SmallVector<unsigned, 4> Indices;
804  E->getEncodedElementAccess(Indices);
805
806  if (Base.isSimple()) {
807    llvm::Constant *CV = GenerateConstantVector(Indices);
808    return LValue::MakeExtVectorElt(Base.getAddress(), CV,
809                                   E->getBase()->getType().getCVRQualifiers());
810  }
811  assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
812
813  llvm::Constant *BaseElts = Base.getExtVectorElts();
814  llvm::SmallVector<llvm::Constant *, 4> CElts;
815
816  for (unsigned i = 0, e = Indices.size(); i != e; ++i) {
817    if (isa<llvm::ConstantAggregateZero>(BaseElts))
818      CElts.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 0));
819    else
820      CElts.push_back(BaseElts->getOperand(Indices[i]));
821  }
822  llvm::Constant *CV = llvm::ConstantVector::get(&CElts[0], CElts.size());
823  return LValue::MakeExtVectorElt(Base.getExtVectorAddr(), CV,
824                                  E->getBase()->getType().getCVRQualifiers());
825}
826
827LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
828  bool isUnion = false;
829  bool isIvar = false;
830  Expr *BaseExpr = E->getBase();
831  llvm::Value *BaseValue = NULL;
832  unsigned CVRQualifiers=0;
833
834  // If this is s.x, emit s as an lvalue.  If it is s->x, emit s as a scalar.
835  if (E->isArrow()) {
836    BaseValue = EmitScalarExpr(BaseExpr);
837    const PointerType *PTy =
838      cast<PointerType>(getContext().getCanonicalType(BaseExpr->getType()));
839    if (PTy->getPointeeType()->isUnionType())
840      isUnion = true;
841    CVRQualifiers = PTy->getPointeeType().getCVRQualifiers();
842  }
843  else if (BaseExpr->getStmtClass() == Expr::ObjCPropertyRefExprClass ||
844           BaseExpr->getStmtClass() == Expr::ObjCKVCRefExprClass) {
845    RValue RV = EmitObjCPropertyGet(BaseExpr);
846    BaseValue = RV.getAggregateAddr();
847    if (BaseExpr->getType()->isUnionType())
848      isUnion = true;
849    CVRQualifiers = BaseExpr->getType().getCVRQualifiers();
850  }
851  else {
852    LValue BaseLV = EmitLValue(BaseExpr);
853    if (BaseLV.isObjCIvar())
854      isIvar = true;
855    // FIXME: this isn't right for bitfields.
856    BaseValue = BaseLV.getAddress();
857    if (BaseExpr->getType()->isUnionType())
858      isUnion = true;
859    CVRQualifiers = BaseExpr->getType().getCVRQualifiers();
860  }
861
862  FieldDecl *Field = dyn_cast<FieldDecl>(E->getMemberDecl());
863  // FIXME: Handle non-field member expressions
864  assert(Field && "No code generation for non-field member references");
865  LValue MemExpLV =  EmitLValueForField(BaseValue, Field, isUnion, CVRQualifiers);
866  LValue::SetObjCIvar(MemExpLV, isIvar);
867  return MemExpLV;
868}
869
870LValue CodeGenFunction::EmitLValueForBitfield(llvm::Value* BaseValue,
871                                              FieldDecl* Field,
872                                              unsigned CVRQualifiers) {
873   unsigned idx = CGM.getTypes().getLLVMFieldNo(Field);
874  // FIXME: CodeGenTypes should expose a method to get the appropriate
875  // type for FieldTy (the appropriate type is ABI-dependent).
876  const llvm::Type *FieldTy = CGM.getTypes().ConvertTypeForMem(Field->getType());
877  const llvm::PointerType *BaseTy =
878  cast<llvm::PointerType>(BaseValue->getType());
879  unsigned AS = BaseTy->getAddressSpace();
880  BaseValue = Builder.CreateBitCast(BaseValue,
881                                    llvm::PointerType::get(FieldTy, AS),
882                                    "tmp");
883  llvm::Value *V = Builder.CreateGEP(BaseValue,
884                              llvm::ConstantInt::get(llvm::Type::Int32Ty, idx),
885                              "tmp");
886
887  CodeGenTypes::BitFieldInfo bitFieldInfo =
888    CGM.getTypes().getBitFieldInfo(Field);
889  return LValue::MakeBitfield(V, bitFieldInfo.Begin, bitFieldInfo.Size,
890                              Field->getType()->isSignedIntegerType(),
891                            Field->getType().getCVRQualifiers()|CVRQualifiers);
892}
893
894LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
895                                           FieldDecl* Field,
896                                           bool isUnion,
897                                           unsigned CVRQualifiers)
898{
899  if (Field->isBitField())
900    return EmitLValueForBitfield(BaseValue, Field, CVRQualifiers);
901
902  unsigned idx = CGM.getTypes().getLLVMFieldNo(Field);
903  llvm::Value *V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
904
905  // Match union field type.
906  if (isUnion) {
907    const llvm::Type *FieldTy =
908      CGM.getTypes().ConvertTypeForMem(Field->getType());
909    const llvm::PointerType * BaseTy =
910      cast<llvm::PointerType>(BaseValue->getType());
911    unsigned AS = BaseTy->getAddressSpace();
912    V = Builder.CreateBitCast(V,
913                              llvm::PointerType::get(FieldTy, AS),
914                              "tmp");
915  }
916
917  LValue LV =
918    LValue::MakeAddr(V,
919                     Field->getType().getCVRQualifiers()|CVRQualifiers);
920  if (const ObjCGCAttr *A = Field->getAttr<ObjCGCAttr>()) {
921    ObjCGCAttr::GCAttrTypes attrType = A->getType();
922    // __weak attribute on a field is ignored.
923    LValue::SetObjCType(false, attrType == ObjCGCAttr::Strong, LV);
924  }
925  else if (CGM.getLangOptions().ObjC1 &&
926           CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
927    QualType ExprTy = Field->getType();
928    if (getContext().isObjCObjectPointerType(ExprTy))
929      LValue::SetObjCType(false, true, LV);
930  }
931  return LV;
932}
933
934LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr* E)
935{
936  const llvm::Type *LTy = ConvertType(E->getType());
937  llvm::Value *DeclPtr = CreateTempAlloca(LTy, ".compoundliteral");
938
939  const Expr* InitExpr = E->getInitializer();
940  LValue Result = LValue::MakeAddr(DeclPtr, E->getType().getCVRQualifiers());
941
942  if (E->getType()->isComplexType()) {
943    EmitComplexExprIntoAddr(InitExpr, DeclPtr, false);
944  } else if (hasAggregateLLVMType(E->getType())) {
945    EmitAnyExpr(InitExpr, DeclPtr, false);
946  } else {
947    EmitStoreThroughLValue(EmitAnyExpr(InitExpr), Result, E->getType());
948  }
949
950  return Result;
951}
952
953//===--------------------------------------------------------------------===//
954//                             Expression Emission
955//===--------------------------------------------------------------------===//
956
957
958RValue CodeGenFunction::EmitCallExpr(const CallExpr *E) {
959  if (const ImplicitCastExpr *IcExpr =
960      dyn_cast<const ImplicitCastExpr>(E->getCallee()))
961    if (const DeclRefExpr *DRExpr =
962        dyn_cast<const DeclRefExpr>(IcExpr->getSubExpr()))
963      if (const FunctionDecl *FDecl =
964          dyn_cast<const FunctionDecl>(DRExpr->getDecl()))
965        if (unsigned builtinID = FDecl->getIdentifier()->getBuiltinID())
966          return EmitBuiltinExpr(builtinID, E);
967
968  if (E->getCallee()->getType()->isBlockPointerType())
969    return EmitUnsupportedRValue(E, "block pointer reference");
970
971  llvm::Value *Callee = EmitScalarExpr(E->getCallee());
972  return EmitCallExpr(Callee, E->getCallee()->getType(),
973                      E->arg_begin(), E->arg_end());
974}
975
976RValue CodeGenFunction::EmitCallExpr(Expr *FnExpr,
977                                     CallExpr::const_arg_iterator ArgBeg,
978                                     CallExpr::const_arg_iterator ArgEnd) {
979
980  llvm::Value *Callee = EmitScalarExpr(FnExpr);
981  return EmitCallExpr(Callee, FnExpr->getType(), ArgBeg, ArgEnd);
982}
983
984LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
985  // Can only get l-value for binary operator expressions which are a
986  // simple assignment of aggregate type.
987  if (E->getOpcode() != BinaryOperator::Assign)
988    return EmitUnsupportedLValue(E, "binary l-value expression");
989
990  llvm::Value *Temp = CreateTempAlloca(ConvertType(E->getType()));
991  EmitAggExpr(E, Temp, false);
992  // FIXME: Are these qualifiers correct?
993  return LValue::MakeAddr(Temp, E->getType().getCVRQualifiers());
994}
995
996LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
997  // Can only get l-value for call expression returning aggregate type
998  RValue RV = EmitCallExpr(E);
999  // FIXME: can this be volatile?
1000  return LValue::MakeAddr(RV.getAggregateAddr(),
1001                          E->getType().getCVRQualifiers());
1002}
1003
1004LValue
1005CodeGenFunction::EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E) {
1006  EmitLocalBlockVarDecl(*E->getVarDecl());
1007  return EmitDeclRefLValue(E);
1008}
1009
1010LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
1011  // Can only get l-value for message expression returning aggregate type
1012  RValue RV = EmitObjCMessageExpr(E);
1013  // FIXME: can this be volatile?
1014  return LValue::MakeAddr(RV.getAggregateAddr(),
1015                          E->getType().getCVRQualifiers());
1016}
1017
1018llvm::Value *CodeGenFunction::EmitIvarOffset(ObjCInterfaceDecl *Interface,
1019                                             const ObjCIvarDecl *Ivar) {
1020  // Objective-C objects are traditionally C structures with their layout
1021  // defined at compile-time.  In some implementations, their layout is not
1022  // defined until run time in order to allow instance variables to be added to
1023  // a class without recompiling all of the subclasses.  If this is the case
1024  // then the CGObjCRuntime subclass must return true to LateBoundIvars and
1025  // implement the lookup itself.
1026  if (CGM.getObjCRuntime().LateBoundIVars())
1027    assert(0 && "late-bound ivars are unsupported");
1028  return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
1029}
1030
1031LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
1032                                          llvm::Value *BaseValue,
1033                                          const ObjCIvarDecl *Ivar,
1034                                          const FieldDecl *Field,
1035                                          unsigned CVRQualifiers) {
1036  // See comment in EmitIvarOffset.
1037  if (CGM.getObjCRuntime().LateBoundIVars())
1038    assert(0 && "late-bound ivars are unsupported");
1039
1040  LValue LV =  CGM.getObjCRuntime().EmitObjCValueForIvar(*this,
1041                                                         ObjectTy,
1042                                                         BaseValue, Ivar, Field,
1043                                                         CVRQualifiers);
1044  SetVarDeclObjCAttribute(getContext(), Ivar, Ivar->getType(), LV);
1045  return LV;
1046}
1047
1048LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
1049  // FIXME: A lot of the code below could be shared with EmitMemberExpr.
1050  llvm::Value *BaseValue = 0;
1051  const Expr *BaseExpr = E->getBase();
1052  unsigned CVRQualifiers = 0;
1053  QualType ObjectTy;
1054  if (E->isArrow()) {
1055    BaseValue = EmitScalarExpr(BaseExpr);
1056    const PointerType *PTy =
1057      cast<PointerType>(getContext().getCanonicalType(BaseExpr->getType()));
1058    ObjectTy = PTy->getPointeeType();
1059    CVRQualifiers = ObjectTy.getCVRQualifiers();
1060  } else {
1061    LValue BaseLV = EmitLValue(BaseExpr);
1062    // FIXME: this isn't right for bitfields.
1063    BaseValue = BaseLV.getAddress();
1064    ObjectTy = BaseExpr->getType();
1065    CVRQualifiers = ObjectTy.getCVRQualifiers();
1066  }
1067
1068  return EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
1069                           getContext().getFieldDecl(E), CVRQualifiers);
1070}
1071
1072LValue
1073CodeGenFunction::EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E) {
1074  // This is a special l-value that just issues sends when we load or
1075  // store through it.
1076  return LValue::MakePropertyRef(E, E->getType().getCVRQualifiers());
1077}
1078
1079LValue
1080CodeGenFunction::EmitObjCKVCRefLValue(const ObjCKVCRefExpr *E) {
1081  // This is a special l-value that just issues sends when we load or
1082  // store through it.
1083  return LValue::MakeKVCRef(E, E->getType().getCVRQualifiers());
1084}
1085
1086LValue
1087CodeGenFunction::EmitObjCSuperExpr(const ObjCSuperExpr *E) {
1088  return EmitUnsupportedLValue(E, "use of super");
1089}
1090
1091RValue CodeGenFunction::EmitCallExpr(llvm::Value *Callee, QualType CalleeType,
1092                                     CallExpr::const_arg_iterator ArgBeg,
1093                                     CallExpr::const_arg_iterator ArgEnd) {
1094  // Get the actual function type. The callee type will always be a
1095  // pointer to function type or a block pointer type.
1096  QualType ResultType;
1097  if (const BlockPointerType *BPT = dyn_cast<BlockPointerType>(CalleeType)) {
1098    ResultType = BPT->getPointeeType()->getAsFunctionType()->getResultType();
1099  } else {
1100    assert(CalleeType->isFunctionPointerType() &&
1101           "Call must have function pointer type!");
1102    QualType FnType = CalleeType->getAsPointerType()->getPointeeType();
1103    ResultType = FnType->getAsFunctionType()->getResultType();
1104  }
1105
1106  CallArgList Args;
1107  for (CallExpr::const_arg_iterator I = ArgBeg; I != ArgEnd; ++I)
1108    Args.push_back(std::make_pair(EmitAnyExprToTemp(*I),
1109                                  I->getType()));
1110
1111  return EmitCall(CGM.getTypes().getFunctionInfo(ResultType, Args),
1112                  Callee, Args);
1113}
1114