CGExpr.cpp revision ce1d38b8163650e473d7084e0686ed5a7956057b 
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::EmitUnsupportedRValue(const Expr *E,
87                                              const char *Name) {
88  ErrorUnsupported(E, Name);
89  llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
90  return RValue::get(llvm::UndefValue::get(Ty));
91}
92
93LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
94                                              const char *Name) {
95  ErrorUnsupported(E, Name);
96  llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
97  return LValue::MakeAddr(llvm::UndefValue::get(Ty),
98                          E->getType().getCVRQualifiers());
99}
100
101/// EmitLValue - Emit code to compute a designator that specifies the location
102/// of the expression.
103///
104/// This can return one of two things: a simple address or a bitfield
105/// reference.  In either case, the LLVM Value* in the LValue structure is
106/// guaranteed to be an LLVM pointer type.
107///
108/// If this returns a bitfield reference, nothing about the pointee type of
109/// the LLVM value is known: For example, it may not be a pointer to an
110/// integer.
111///
112/// If this returns a normal address, and if the lvalue's C type is fixed
113/// size, this method guarantees that the returned pointer type will point to
114/// an LLVM type of the same size of the lvalue's type.  If the lvalue has a
115/// variable length type, this is not possible.
116///
117LValue CodeGenFunction::EmitLValue(const Expr *E) {
118  switch (E->getStmtClass()) {
119  default: return EmitUnsupportedLValue(E, "l-value expression");
120
121  case Expr::BinaryOperatorClass:
122    return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
123  case Expr::CallExprClass:
124  case Expr::CXXOperatorCallExprClass:
125    return EmitCallExprLValue(cast<CallExpr>(E));
126  case Expr::DeclRefExprClass:
127  case Expr::QualifiedDeclRefExprClass:
128    return EmitDeclRefLValue(cast<DeclRefExpr>(E));
129  case Expr::ParenExprClass:return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
130  case Expr::PredefinedExprClass:
131    return EmitPredefinedLValue(cast<PredefinedExpr>(E));
132  case Expr::StringLiteralClass:
133    return EmitStringLiteralLValue(cast<StringLiteral>(E));
134
135  case Expr::CXXConditionDeclExprClass:
136    return EmitCXXConditionDeclLValue(cast<CXXConditionDeclExpr>(E));
137
138  case Expr::ObjCMessageExprClass:
139    return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
140  case Expr::ObjCIvarRefExprClass:
141    return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
142  case Expr::ObjCPropertyRefExprClass:
143    return EmitObjCPropertyRefLValue(cast<ObjCPropertyRefExpr>(E));
144  case Expr::ObjCKVCRefExprClass:
145    return EmitObjCKVCRefLValue(cast<ObjCKVCRefExpr>(E));
146  case Expr::ObjCSuperExprClass:
147    return EmitObjCSuperExpr(cast<ObjCSuperExpr>(E));
148
149  case Expr::UnaryOperatorClass:
150    return EmitUnaryOpLValue(cast<UnaryOperator>(E));
151  case Expr::ArraySubscriptExprClass:
152    return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
153  case Expr::ExtVectorElementExprClass:
154    return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
155  case Expr::MemberExprClass: return EmitMemberExpr(cast<MemberExpr>(E));
156  case Expr::CompoundLiteralExprClass:
157    return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
158  case Expr::ChooseExprClass:
159    // __builtin_choose_expr is the lvalue of the selected operand.
160    if (cast<ChooseExpr>(E)->isConditionTrue(getContext()))
161      return EmitLValue(cast<ChooseExpr>(E)->getLHS());
162    else
163      return EmitLValue(cast<ChooseExpr>(E)->getRHS());
164  }
165}
166
167/// EmitLoadOfLValue - Given an expression that represents a value lvalue,
168/// this method emits the address of the lvalue, then loads the result as an
169/// rvalue, returning the rvalue.
170RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, QualType ExprType) {
171  if (LV.isObjCWeak()) {
172    // load of a __weak object.
173    llvm::Value *AddrWeakObj = LV.getAddress();
174    llvm::Value *read_weak = CGM.getObjCRuntime().EmitObjCWeakRead(*this,
175                                                                   AddrWeakObj);
176    return RValue::get(read_weak);
177  }
178
179  if (LV.isSimple()) {
180    llvm::Value *Ptr = LV.getAddress();
181    const llvm::Type *EltTy =
182      cast<llvm::PointerType>(Ptr->getType())->getElementType();
183
184    // Simple scalar l-value.
185    if (EltTy->isSingleValueType()) {
186      llvm::Value *V = Builder.CreateLoad(Ptr, LV.isVolatileQualified(),"tmp");
187
188      // Bool can have different representation in memory than in registers.
189      if (ExprType->isBooleanType()) {
190        if (V->getType() != llvm::Type::Int1Ty)
191          V = Builder.CreateTrunc(V, llvm::Type::Int1Ty, "tobool");
192      }
193
194      return RValue::get(V);
195    }
196
197    assert(ExprType->isFunctionType() && "Unknown scalar value");
198    return RValue::get(Ptr);
199  }
200
201  if (LV.isVectorElt()) {
202    llvm::Value *Vec = Builder.CreateLoad(LV.getVectorAddr(),
203                                          LV.isVolatileQualified(), "tmp");
204    return RValue::get(Builder.CreateExtractElement(Vec, LV.getVectorIdx(),
205                                                    "vecext"));
206  }
207
208  // If this is a reference to a subset of the elements of a vector, either
209  // shuffle the input or extract/insert them as appropriate.
210  if (LV.isExtVectorElt())
211    return EmitLoadOfExtVectorElementLValue(LV, ExprType);
212
213  if (LV.isBitfield())
214    return EmitLoadOfBitfieldLValue(LV, ExprType);
215
216  if (LV.isPropertyRef())
217    return EmitLoadOfPropertyRefLValue(LV, ExprType);
218
219  if (LV.isKVCRef())
220    return EmitLoadOfKVCRefLValue(LV, ExprType);
221
222  assert(0 && "Unknown LValue type!");
223  //an invalid RValue, but the assert will
224  //ensure that this point is never reached
225  return RValue();
226}
227
228RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
229                                                 QualType ExprType) {
230  unsigned StartBit = LV.getBitfieldStartBit();
231  unsigned BitfieldSize = LV.getBitfieldSize();
232  llvm::Value *Ptr = LV.getBitfieldAddr();
233
234  const llvm::Type *EltTy =
235    cast<llvm::PointerType>(Ptr->getType())->getElementType();
236  unsigned EltTySize = CGM.getTargetData().getTypeSizeInBits(EltTy);
237
238  // In some cases the bitfield may straddle two memory locations.
239  // Currently we load the entire bitfield, then do the magic to
240  // sign-extend it if necessary. This results in somewhat more code
241  // than necessary for the common case (one load), since two shifts
242  // accomplish both the masking and sign extension.
243  unsigned LowBits = std::min(BitfieldSize, EltTySize - StartBit);
244  llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "tmp");
245
246  // Shift to proper location.
247  if (StartBit)
248    Val = Builder.CreateLShr(Val, llvm::ConstantInt::get(EltTy, StartBit),
249                             "bf.lo");
250
251  // Mask off unused bits.
252  llvm::Constant *LowMask =
253    llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, LowBits));
254  Val = Builder.CreateAnd(Val, LowMask, "bf.lo.cleared");
255
256  // Fetch the high bits if necessary.
257  if (LowBits < BitfieldSize) {
258    unsigned HighBits = BitfieldSize - LowBits;
259    llvm::Value *HighPtr =
260      Builder.CreateGEP(Ptr, llvm::ConstantInt::get(llvm::Type::Int32Ty, 1),
261                        "bf.ptr.hi");
262    llvm::Value *HighVal = Builder.CreateLoad(HighPtr,
263                                              LV.isVolatileQualified(),
264                                              "tmp");
265
266    // Mask off unused bits.
267    llvm::Constant *HighMask =
268      llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, HighBits));
269    HighVal = Builder.CreateAnd(HighVal, HighMask, "bf.lo.cleared");
270
271    // Shift to proper location and or in to bitfield value.
272    HighVal = Builder.CreateShl(HighVal,
273                                llvm::ConstantInt::get(EltTy, LowBits));
274    Val = Builder.CreateOr(Val, HighVal, "bf.val");
275  }
276
277  // Sign extend if necessary.
278  if (LV.isBitfieldSigned()) {
279    llvm::Value *ExtraBits = llvm::ConstantInt::get(EltTy,
280                                                    EltTySize - BitfieldSize);
281    Val = Builder.CreateAShr(Builder.CreateShl(Val, ExtraBits),
282                             ExtraBits, "bf.val.sext");
283  }
284
285  // The bitfield type and the normal type differ when the storage sizes
286  // differ (currently just _Bool).
287  Val = Builder.CreateIntCast(Val, ConvertType(ExprType), false, "tmp");
288
289  return RValue::get(Val);
290}
291
292RValue CodeGenFunction::EmitLoadOfPropertyRefLValue(LValue LV,
293                                                    QualType ExprType) {
294  return EmitObjCPropertyGet(LV.getPropertyRefExpr());
295}
296
297RValue CodeGenFunction::EmitLoadOfKVCRefLValue(LValue LV,
298                                               QualType ExprType) {
299  return EmitObjCPropertyGet(LV.getKVCRefExpr());
300}
301
302// If this is a reference to a subset of the elements of a vector, either
303// shuffle the input or extract/insert them as appropriate.
304RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV,
305                                                         QualType ExprType) {
306  llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddr(),
307                                        LV.isVolatileQualified(), "tmp");
308
309  const llvm::Constant *Elts = LV.getExtVectorElts();
310
311  // If the result of the expression is a non-vector type, we must be
312  // extracting a single element.  Just codegen as an extractelement.
313  const VectorType *ExprVT = ExprType->getAsVectorType();
314  if (!ExprVT) {
315    unsigned InIdx = getAccessedFieldNo(0, Elts);
316    llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
317    return RValue::get(Builder.CreateExtractElement(Vec, Elt, "tmp"));
318  }
319
320  // If the source and destination have the same number of elements, use a
321  // vector shuffle instead of insert/extracts.
322  unsigned NumResultElts = ExprVT->getNumElements();
323  unsigned NumSourceElts =
324    cast<llvm::VectorType>(Vec->getType())->getNumElements();
325
326  if (NumResultElts == NumSourceElts) {
327    llvm::SmallVector<llvm::Constant*, 4> Mask;
328    for (unsigned i = 0; i != NumResultElts; ++i) {
329      unsigned InIdx = getAccessedFieldNo(i, Elts);
330      Mask.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx));
331    }
332
333    llvm::Value *MaskV = llvm::ConstantVector::get(&Mask[0], Mask.size());
334    Vec = Builder.CreateShuffleVector(Vec,
335                                      llvm::UndefValue::get(Vec->getType()),
336                                      MaskV, "tmp");
337    return RValue::get(Vec);
338  }
339
340  // Start out with an undef of the result type.
341  llvm::Value *Result = llvm::UndefValue::get(ConvertType(ExprType));
342
343  // Extract/Insert each element of the result.
344  for (unsigned i = 0; i != NumResultElts; ++i) {
345    unsigned InIdx = getAccessedFieldNo(i, Elts);
346    llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
347    Elt = Builder.CreateExtractElement(Vec, Elt, "tmp");
348
349    llvm::Value *OutIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, i);
350    Result = Builder.CreateInsertElement(Result, Elt, OutIdx, "tmp");
351  }
352
353  return RValue::get(Result);
354}
355
356
357
358/// EmitStoreThroughLValue - Store the specified rvalue into the specified
359/// lvalue, where both are guaranteed to the have the same type, and that type
360/// is 'Ty'.
361void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
362                                             QualType Ty) {
363  if (!Dst.isSimple()) {
364    if (Dst.isVectorElt()) {
365      // Read/modify/write the vector, inserting the new element.
366      llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddr(),
367                                            Dst.isVolatileQualified(), "tmp");
368      Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
369                                        Dst.getVectorIdx(), "vecins");
370      Builder.CreateStore(Vec, Dst.getVectorAddr(),Dst.isVolatileQualified());
371      return;
372    }
373
374    // If this is an update of extended vector elements, insert them as
375    // appropriate.
376    if (Dst.isExtVectorElt())
377      return EmitStoreThroughExtVectorComponentLValue(Src, Dst, Ty);
378
379    if (Dst.isBitfield())
380      return EmitStoreThroughBitfieldLValue(Src, Dst, Ty);
381
382    if (Dst.isPropertyRef())
383      return EmitStoreThroughPropertyRefLValue(Src, Dst, Ty);
384
385    if (Dst.isKVCRef())
386      return EmitStoreThroughKVCRefLValue(Src, Dst, Ty);
387
388    assert(0 && "Unknown LValue type");
389  }
390
391  if (Dst.isObjCWeak()) {
392    // load of a __weak object.
393    llvm::Value *LvalueDst = Dst.getAddress();
394    llvm::Value *src = Src.getScalarVal();
395    CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
396    return;
397  }
398
399  if (Dst.isObjCStrong()) {
400    // load of a __strong object.
401    llvm::Value *LvalueDst = Dst.getAddress();
402    llvm::Value *src = Src.getScalarVal();
403    if (Dst.isObjCIvar())
404      CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, LvalueDst);
405    else
406      CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst);
407    return;
408  }
409
410  llvm::Value *DstAddr = Dst.getAddress();
411  assert(Src.isScalar() && "Can't emit an agg store with this method");
412  // FIXME: Handle volatility etc.
413  const llvm::Type *SrcTy = Src.getScalarVal()->getType();
414  const llvm::PointerType *DstPtr = cast<llvm::PointerType>(DstAddr->getType());
415  const llvm::Type *AddrTy = DstPtr->getElementType();
416  unsigned AS = DstPtr->getAddressSpace();
417
418  if (AddrTy != SrcTy)
419    DstAddr = Builder.CreateBitCast(DstAddr,
420                                    llvm::PointerType::get(SrcTy, AS),
421                                    "storetmp");
422  Builder.CreateStore(Src.getScalarVal(), DstAddr, Dst.isVolatileQualified());
423}
424
425void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
426                                                     QualType Ty,
427                                                     llvm::Value **Result) {
428  unsigned StartBit = Dst.getBitfieldStartBit();
429  unsigned BitfieldSize = Dst.getBitfieldSize();
430  llvm::Value *Ptr = Dst.getBitfieldAddr();
431
432  const llvm::Type *EltTy =
433    cast<llvm::PointerType>(Ptr->getType())->getElementType();
434  unsigned EltTySize = CGM.getTargetData().getTypeSizeInBits(EltTy);
435
436  // Get the new value, cast to the appropriate type and masked to
437  // exactly the size of the bit-field.
438  llvm::Value *SrcVal = Src.getScalarVal();
439  llvm::Value *NewVal = Builder.CreateIntCast(SrcVal, EltTy, false, "tmp");
440  llvm::Constant *Mask =
441    llvm::ConstantInt::get(llvm::APInt::getLowBitsSet(EltTySize, BitfieldSize));
442  NewVal = Builder.CreateAnd(NewVal, Mask, "bf.value");
443
444  // Return the new value of the bit-field, if requested.
445  if (Result) {
446    // Cast back to the proper type for result.
447    const llvm::Type *SrcTy = SrcVal->getType();
448    llvm::Value *SrcTrunc = Builder.CreateIntCast(NewVal, SrcTy, false,
449                                                  "bf.reload.val");
450
451    // Sign extend if necessary.
452    if (Dst.isBitfieldSigned()) {
453      unsigned SrcTySize = CGM.getTargetData().getTypeSizeInBits(SrcTy);
454      llvm::Value *ExtraBits = llvm::ConstantInt::get(SrcTy,
455                                                      SrcTySize - BitfieldSize);
456      SrcTrunc = Builder.CreateAShr(Builder.CreateShl(SrcTrunc, ExtraBits),
457                                    ExtraBits, "bf.reload.sext");
458    }
459
460    *Result = SrcTrunc;
461  }
462
463  // In some cases the bitfield may straddle two memory locations.
464  // Emit the low part first and check to see if the high needs to be
465  // done.
466  unsigned LowBits = std::min(BitfieldSize, EltTySize - StartBit);
467  llvm::Value *LowVal = Builder.CreateLoad(Ptr, Dst.isVolatileQualified(),
468                                           "bf.prev.low");
469
470  // Compute the mask for zero-ing the low part of this bitfield.
471  llvm::Constant *InvMask =
472    llvm::ConstantInt::get(~llvm::APInt::getBitsSet(EltTySize, StartBit,
473                                                    StartBit + LowBits));
474
475  // Compute the new low part as
476  //   LowVal = (LowVal & InvMask) | (NewVal << StartBit),
477  // with the shift of NewVal implicitly stripping the high bits.
478  llvm::Value *NewLowVal =
479    Builder.CreateShl(NewVal, llvm::ConstantInt::get(EltTy, StartBit),
480                      "bf.value.lo");
481  LowVal = Builder.CreateAnd(LowVal, InvMask, "bf.prev.lo.cleared");
482  LowVal = Builder.CreateOr(LowVal, NewLowVal, "bf.new.lo");
483
484  // Write back.
485  Builder.CreateStore(LowVal, Ptr, Dst.isVolatileQualified());
486
487  // If the low part doesn't cover the bitfield emit a high part.
488  if (LowBits < BitfieldSize) {
489    unsigned HighBits = BitfieldSize - LowBits;
490    llvm::Value *HighPtr =
491      Builder.CreateGEP(Ptr, llvm::ConstantInt::get(llvm::Type::Int32Ty, 1),
492                        "bf.ptr.hi");
493    llvm::Value *HighVal = Builder.CreateLoad(HighPtr,
494                                              Dst.isVolatileQualified(),
495                                              "bf.prev.hi");
496
497    // Compute the mask for zero-ing the high part of this bitfield.
498    llvm::Constant *InvMask =
499      llvm::ConstantInt::get(~llvm::APInt::getLowBitsSet(EltTySize, HighBits));
500
501    // Compute the new high part as
502    //   HighVal = (HighVal & InvMask) | (NewVal lshr LowBits),
503    // where the high bits of NewVal have already been cleared and the
504    // shift stripping the low bits.
505    llvm::Value *NewHighVal =
506      Builder.CreateLShr(NewVal, llvm::ConstantInt::get(EltTy, LowBits),
507                        "bf.value.high");
508    HighVal = Builder.CreateAnd(HighVal, InvMask, "bf.prev.hi.cleared");
509    HighVal = Builder.CreateOr(HighVal, NewHighVal, "bf.new.hi");
510
511    // Write back.
512    Builder.CreateStore(HighVal, HighPtr, Dst.isVolatileQualified());
513  }
514}
515
516void CodeGenFunction::EmitStoreThroughPropertyRefLValue(RValue Src,
517                                                        LValue Dst,
518                                                        QualType Ty) {
519  EmitObjCPropertySet(Dst.getPropertyRefExpr(), Src);
520}
521
522void CodeGenFunction::EmitStoreThroughKVCRefLValue(RValue Src,
523                                                   LValue Dst,
524                                                   QualType Ty) {
525  EmitObjCPropertySet(Dst.getKVCRefExpr(), Src);
526}
527
528void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
529                                                               LValue Dst,
530                                                               QualType Ty) {
531  // This access turns into a read/modify/write of the vector.  Load the input
532  // value now.
533  llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddr(),
534                                        Dst.isVolatileQualified(), "tmp");
535  const llvm::Constant *Elts = Dst.getExtVectorElts();
536
537  llvm::Value *SrcVal = Src.getScalarVal();
538
539  if (const VectorType *VTy = Ty->getAsVectorType()) {
540    unsigned NumSrcElts = VTy->getNumElements();
541
542    // Extract/Insert each element.
543    for (unsigned i = 0; i != NumSrcElts; ++i) {
544      llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, i);
545      Elt = Builder.CreateExtractElement(SrcVal, Elt, "tmp");
546
547      unsigned Idx = getAccessedFieldNo(i, Elts);
548      llvm::Value *OutIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, Idx);
549      Vec = Builder.CreateInsertElement(Vec, Elt, OutIdx, "tmp");
550    }
551  } else {
552    // If the Src is a scalar (not a vector) it must be updating one element.
553    unsigned InIdx = getAccessedFieldNo(0, Elts);
554    llvm::Value *Elt = llvm::ConstantInt::get(llvm::Type::Int32Ty, InIdx);
555    Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt, "tmp");
556  }
557
558  Builder.CreateStore(Vec, Dst.getExtVectorAddr(), Dst.isVolatileQualified());
559}
560
561/// SetVarDeclObjCAttribute - Set __weak/__strong attributes into the LValue
562/// object.
563static void SetVarDeclObjCAttribute(ASTContext &Ctx, const Decl *VD,
564                                    const QualType &Ty, LValue &LV)
565{
566  if (const ObjCGCAttr *A = VD->getAttr<ObjCGCAttr>()) {
567    ObjCGCAttr::GCAttrTypes attrType = A->getType();
568    LValue::SetObjCType(attrType == ObjCGCAttr::Weak,
569                        attrType == ObjCGCAttr::Strong, LV);
570  }
571  else if (Ctx.getLangOptions().ObjC1 &&
572           Ctx.getLangOptions().getGCMode() != LangOptions::NonGC) {
573    // Default behavious under objective-c's gc is for objective-c pointers
574    // be treated as though they were declared as __strong.
575    if (Ctx.isObjCObjectPointerType(Ty))
576      LValue::SetObjCType(false, true, LV);
577  }
578}
579
580LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
581  const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl());
582
583  if (VD && (VD->isBlockVarDecl() || isa<ParmVarDecl>(VD) ||
584        isa<ImplicitParamDecl>(VD))) {
585    LValue LV;
586    if (VD->getStorageClass() == VarDecl::Extern) {
587      LV = LValue::MakeAddr(CGM.GetAddrOfGlobalVar(VD),
588                            E->getType().getCVRQualifiers());
589    }
590    else {
591      llvm::Value *V = LocalDeclMap[VD];
592      assert(V && "BlockVarDecl not entered in LocalDeclMap?");
593      LV = LValue::MakeAddr(V, E->getType().getCVRQualifiers());
594    }
595    if (VD->isBlockVarDecl() &&
596        (VD->getStorageClass() == VarDecl::Static ||
597         VD->getStorageClass() == VarDecl::Extern))
598      SetVarDeclObjCAttribute(getContext(), VD, E->getType(), LV);
599    return LV;
600  } else if (VD && VD->isFileVarDecl()) {
601    LValue LV = LValue::MakeAddr(CGM.GetAddrOfGlobalVar(VD),
602                                 E->getType().getCVRQualifiers());
603    SetVarDeclObjCAttribute(getContext(), VD, E->getType(), LV);
604    return LV;
605  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) {
606    return LValue::MakeAddr(CGM.GetAddrOfFunction(FD),
607                            E->getType().getCVRQualifiers());
608  }
609  else if (const ImplicitParamDecl *IPD =
610      dyn_cast<ImplicitParamDecl>(E->getDecl())) {
611    llvm::Value *V = LocalDeclMap[IPD];
612    assert(V && "BlockVarDecl not entered in LocalDeclMap?");
613    return LValue::MakeAddr(V, E->getType().getCVRQualifiers());
614  }
615  assert(0 && "Unimp declref");
616  //an invalid LValue, but the assert will
617  //ensure that this point is never reached.
618  return LValue();
619}
620
621LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
622  // __extension__ doesn't affect lvalue-ness.
623  if (E->getOpcode() == UnaryOperator::Extension)
624    return EmitLValue(E->getSubExpr());
625
626  QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
627  switch (E->getOpcode()) {
628  default: assert(0 && "Unknown unary operator lvalue!");
629  case UnaryOperator::Deref:
630    return LValue::MakeAddr(EmitScalarExpr(E->getSubExpr()),
631                            ExprTy->getAsPointerType()->getPointeeType()
632                                    .getCVRQualifiers());
633  case UnaryOperator::Real:
634  case UnaryOperator::Imag:
635    LValue LV = EmitLValue(E->getSubExpr());
636    unsigned Idx = E->getOpcode() == UnaryOperator::Imag;
637    return LValue::MakeAddr(Builder.CreateStructGEP(LV.getAddress(),
638                                                    Idx, "idx"),
639                            ExprTy.getCVRQualifiers());
640  }
641}
642
643LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
644  return LValue::MakeAddr(CGM.GetAddrOfConstantStringFromLiteral(E), 0);
645}
646
647LValue CodeGenFunction::EmitPredefinedFunctionName(unsigned Type) {
648  std::string GlobalVarName;
649
650  switch (Type) {
651    default:
652      assert(0 && "Invalid type");
653    case PredefinedExpr::Func:
654      GlobalVarName = "__func__.";
655      break;
656    case PredefinedExpr::Function:
657      GlobalVarName = "__FUNCTION__.";
658      break;
659    case PredefinedExpr::PrettyFunction:
660      // FIXME:: Demangle C++ method names
661      GlobalVarName = "__PRETTY_FUNCTION__.";
662      break;
663  }
664
665  std::string FunctionName;
666  if(const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl)) {
667    FunctionName = FD->getNameAsString();
668  } else {
669    // Just get the mangled name.
670    FunctionName = CurFn->getName();
671  }
672
673  GlobalVarName += FunctionName;
674  llvm::Constant *C =
675    CGM.GetAddrOfConstantCString(FunctionName, GlobalVarName.c_str());
676  return LValue::MakeAddr(C, 0);
677}
678
679LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
680  switch (E->getIdentType()) {
681  default:
682    return EmitUnsupportedLValue(E, "predefined expression");
683  case PredefinedExpr::Func:
684  case PredefinedExpr::Function:
685  case PredefinedExpr::PrettyFunction:
686    return EmitPredefinedFunctionName(E->getIdentType());
687  }
688}
689
690LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E) {
691  // The index must always be an integer, which is not an aggregate.  Emit it.
692  llvm::Value *Idx = EmitScalarExpr(E->getIdx());
693
694  // If the base is a vector type, then we are forming a vector element lvalue
695  // with this subscript.
696  if (E->getBase()->getType()->isVectorType()) {
697    // Emit the vector as an lvalue to get its address.
698    LValue LHS = EmitLValue(E->getBase());
699    assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
700    // FIXME: This should properly sign/zero/extend or truncate Idx to i32.
701    return LValue::MakeVectorElt(LHS.getAddress(), Idx,
702      E->getBase()->getType().getCVRQualifiers());
703  }
704
705  // The base must be a pointer, which is not an aggregate.  Emit it.
706  llvm::Value *Base = EmitScalarExpr(E->getBase());
707
708  // Extend or truncate the index type to 32 or 64-bits.
709  QualType IdxTy  = E->getIdx()->getType();
710  bool IdxSigned = IdxTy->isSignedIntegerType();
711  unsigned IdxBitwidth = cast<llvm::IntegerType>(Idx->getType())->getBitWidth();
712  if (IdxBitwidth != LLVMPointerWidth)
713    Idx = Builder.CreateIntCast(Idx, llvm::IntegerType::get(LLVMPointerWidth),
714                                IdxSigned, "idxprom");
715
716  // We know that the pointer points to a type of the correct size, unless the
717  // size is a VLA.
718  if (const VariableArrayType *VAT =
719        getContext().getAsVariableArrayType(E->getType())) {
720    llvm::Value *VLASize = VLASizeMap[VAT];
721
722    Idx = Builder.CreateMul(Idx, VLASize);
723
724    QualType BaseType = getContext().getBaseElementType(VAT);
725
726    uint64_t BaseTypeSize = getContext().getTypeSize(BaseType) / 8;
727    Idx = Builder.CreateUDiv(Idx,
728                             llvm::ConstantInt::get(Idx->getType(),
729                                                    BaseTypeSize));
730  }
731
732  QualType ExprTy = getContext().getCanonicalType(E->getBase()->getType());
733
734  return LValue::MakeAddr(Builder.CreateGEP(Base, Idx, "arrayidx"),
735                          ExprTy->getAsPointerType()->getPointeeType()
736                               .getCVRQualifiers());
737}
738
739static
740llvm::Constant *GenerateConstantVector(llvm::SmallVector<unsigned, 4> &Elts) {
741  llvm::SmallVector<llvm::Constant *, 4> CElts;
742
743  for (unsigned i = 0, e = Elts.size(); i != e; ++i)
744    CElts.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, Elts[i]));
745
746  return llvm::ConstantVector::get(&CElts[0], CElts.size());
747}
748
749LValue CodeGenFunction::
750EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
751  // Emit the base vector as an l-value.
752  LValue Base = EmitLValue(E->getBase());
753
754  // Encode the element access list into a vector of unsigned indices.
755  llvm::SmallVector<unsigned, 4> Indices;
756  E->getEncodedElementAccess(Indices);
757
758  if (Base.isSimple()) {
759    llvm::Constant *CV = GenerateConstantVector(Indices);
760    return LValue::MakeExtVectorElt(Base.getAddress(), CV,
761                                   E->getBase()->getType().getCVRQualifiers());
762  }
763  assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
764
765  llvm::Constant *BaseElts = Base.getExtVectorElts();
766  llvm::SmallVector<llvm::Constant *, 4> CElts;
767
768  for (unsigned i = 0, e = Indices.size(); i != e; ++i) {
769    if (isa<llvm::ConstantAggregateZero>(BaseElts))
770      CElts.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty, 0));
771    else
772      CElts.push_back(BaseElts->getOperand(Indices[i]));
773  }
774  llvm::Constant *CV = llvm::ConstantVector::get(&CElts[0], CElts.size());
775  return LValue::MakeExtVectorElt(Base.getExtVectorAddr(), CV,
776                                  E->getBase()->getType().getCVRQualifiers());
777}
778
779LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
780  bool isUnion = false;
781  bool isIvar = false;
782  Expr *BaseExpr = E->getBase();
783  llvm::Value *BaseValue = NULL;
784  unsigned CVRQualifiers=0;
785
786  // If this is s.x, emit s as an lvalue.  If it is s->x, emit s as a scalar.
787  if (E->isArrow()) {
788    BaseValue = EmitScalarExpr(BaseExpr);
789    const PointerType *PTy =
790      cast<PointerType>(getContext().getCanonicalType(BaseExpr->getType()));
791    if (PTy->getPointeeType()->isUnionType())
792      isUnion = true;
793    CVRQualifiers = PTy->getPointeeType().getCVRQualifiers();
794  }
795  else {
796    LValue BaseLV = EmitLValue(BaseExpr);
797    if (BaseLV.isObjCIvar())
798      isIvar = true;
799    // FIXME: this isn't right for bitfields.
800    BaseValue = BaseLV.getAddress();
801    if (BaseExpr->getType()->isUnionType())
802      isUnion = true;
803    CVRQualifiers = BaseExpr->getType().getCVRQualifiers();
804  }
805
806  FieldDecl *Field = dyn_cast<FieldDecl>(E->getMemberDecl());
807  // FIXME: Handle non-field member expressions
808  assert(Field && "No code generation for non-field member references");
809  LValue MemExpLV =  EmitLValueForField(BaseValue, Field, isUnion, CVRQualifiers);
810  LValue::SetObjCIvar(MemExpLV, isIvar);
811  return MemExpLV;
812}
813
814LValue CodeGenFunction::EmitLValueForBitfield(llvm::Value* BaseValue,
815                                              FieldDecl* Field,
816                                              unsigned CVRQualifiers,
817                                              unsigned idx) {
818  // FIXME: CodeGenTypes should expose a method to get the appropriate
819  // type for FieldTy (the appropriate type is ABI-dependent).
820  const llvm::Type *FieldTy = CGM.getTypes().ConvertTypeForMem(Field->getType());
821  const llvm::PointerType *BaseTy =
822  cast<llvm::PointerType>(BaseValue->getType());
823  unsigned AS = BaseTy->getAddressSpace();
824  BaseValue = Builder.CreateBitCast(BaseValue,
825                                    llvm::PointerType::get(FieldTy, AS),
826                                    "tmp");
827  llvm::Value *V = Builder.CreateGEP(BaseValue,
828                              llvm::ConstantInt::get(llvm::Type::Int32Ty, idx),
829                              "tmp");
830
831  CodeGenTypes::BitFieldInfo bitFieldInfo =
832    CGM.getTypes().getBitFieldInfo(Field);
833  return LValue::MakeBitfield(V, bitFieldInfo.Begin, bitFieldInfo.Size,
834                              Field->getType()->isSignedIntegerType(),
835                            Field->getType().getCVRQualifiers()|CVRQualifiers);
836}
837
838LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
839                                           FieldDecl* Field,
840                                           bool isUnion,
841                                           unsigned CVRQualifiers)
842{
843  unsigned idx = CGM.getTypes().getLLVMFieldNo(Field);
844
845  if (Field->isBitField())
846    return EmitLValueForBitfield(BaseValue, Field, CVRQualifiers, idx);
847
848  llvm::Value *V = Builder.CreateStructGEP(BaseValue, idx, "tmp");
849
850  // Match union field type.
851  if (isUnion) {
852    const llvm::Type *FieldTy =
853      CGM.getTypes().ConvertTypeForMem(Field->getType());
854    const llvm::PointerType * BaseTy =
855      cast<llvm::PointerType>(BaseValue->getType());
856    unsigned AS = BaseTy->getAddressSpace();
857    V = Builder.CreateBitCast(V,
858                              llvm::PointerType::get(FieldTy, AS),
859                              "tmp");
860  }
861
862  LValue LV =
863    LValue::MakeAddr(V,
864                     Field->getType().getCVRQualifiers()|CVRQualifiers);
865  if (const ObjCGCAttr *A = Field->getAttr<ObjCGCAttr>()) {
866    ObjCGCAttr::GCAttrTypes attrType = A->getType();
867    // __weak attribute on a field is ignored.
868    LValue::SetObjCType(false, attrType == ObjCGCAttr::Strong, LV);
869  }
870  else if (CGM.getLangOptions().ObjC1 &&
871           CGM.getLangOptions().getGCMode() != LangOptions::NonGC) {
872    QualType ExprTy = Field->getType();
873    if (getContext().isObjCObjectPointerType(ExprTy))
874      LValue::SetObjCType(false, true, LV);
875  }
876  return LV;
877}
878
879LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr* E)
880{
881  const llvm::Type *LTy = ConvertType(E->getType());
882  llvm::Value *DeclPtr = CreateTempAlloca(LTy, ".compoundliteral");
883
884  const Expr* InitExpr = E->getInitializer();
885  LValue Result = LValue::MakeAddr(DeclPtr, E->getType().getCVRQualifiers());
886
887  if (E->getType()->isComplexType()) {
888    EmitComplexExprIntoAddr(InitExpr, DeclPtr, false);
889  } else if (hasAggregateLLVMType(E->getType())) {
890    EmitAnyExpr(InitExpr, DeclPtr, false);
891  } else {
892    EmitStoreThroughLValue(EmitAnyExpr(InitExpr), Result, E->getType());
893  }
894
895  return Result;
896}
897
898//===--------------------------------------------------------------------===//
899//                             Expression Emission
900//===--------------------------------------------------------------------===//
901
902
903RValue CodeGenFunction::EmitCallExpr(const CallExpr *E) {
904  if (const ImplicitCastExpr *IcExpr =
905      dyn_cast<const ImplicitCastExpr>(E->getCallee()))
906    if (const DeclRefExpr *DRExpr =
907        dyn_cast<const DeclRefExpr>(IcExpr->getSubExpr()))
908      if (const FunctionDecl *FDecl =
909          dyn_cast<const FunctionDecl>(DRExpr->getDecl()))
910        if (unsigned builtinID = FDecl->getIdentifier()->getBuiltinID())
911          return EmitBuiltinExpr(builtinID, E);
912
913  if (E->getCallee()->getType()->isBlockPointerType())
914    return EmitUnsupportedRValue(E->getCallee(), "block pointer reference");
915
916  llvm::Value *Callee = EmitScalarExpr(E->getCallee());
917  return EmitCallExpr(Callee, E->getCallee()->getType(),
918                      E->arg_begin(), E->arg_end());
919}
920
921RValue CodeGenFunction::EmitCallExpr(Expr *FnExpr,
922                                     CallExpr::const_arg_iterator ArgBeg,
923                                     CallExpr::const_arg_iterator ArgEnd) {
924
925  llvm::Value *Callee = EmitScalarExpr(FnExpr);
926  return EmitCallExpr(Callee, FnExpr->getType(), ArgBeg, ArgEnd);
927}
928
929LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
930  // Can only get l-value for binary operator expressions which are a
931  // simple assignment of aggregate type.
932  if (E->getOpcode() != BinaryOperator::Assign)
933    return EmitUnsupportedLValue(E, "binary l-value expression");
934
935  llvm::Value *Temp = CreateTempAlloca(ConvertType(E->getType()));
936  EmitAggExpr(E, Temp, false);
937  // FIXME: Are these qualifiers correct?
938  return LValue::MakeAddr(Temp, E->getType().getCVRQualifiers());
939}
940
941LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
942  // Can only get l-value for call expression returning aggregate type
943  RValue RV = EmitCallExpr(E);
944  // FIXME: can this be volatile?
945  return LValue::MakeAddr(RV.getAggregateAddr(),
946                          E->getType().getCVRQualifiers());
947}
948
949LValue
950CodeGenFunction::EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E) {
951  EmitLocalBlockVarDecl(*E->getVarDecl());
952  return EmitDeclRefLValue(E);
953}
954
955LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
956  // Can only get l-value for message expression returning aggregate type
957  RValue RV = EmitObjCMessageExpr(E);
958  // FIXME: can this be volatile?
959  return LValue::MakeAddr(RV.getAggregateAddr(),
960                          E->getType().getCVRQualifiers());
961}
962
963llvm::Value *CodeGenFunction::EmitIvarOffset(ObjCInterfaceDecl *Interface,
964                                             const ObjCIvarDecl *Ivar) {
965  // Objective-C objects are traditionally C structures with their layout
966  // defined at compile-time.  In some implementations, their layout is not
967  // defined until run time in order to allow instance variables to be added to
968  // a class without recompiling all of the subclasses.  If this is the case
969  // then the CGObjCRuntime subclass must return true to LateBoundIvars and
970  // implement the lookup itself.
971  if (CGM.getObjCRuntime().LateBoundIVars())
972    assert(0 && "late-bound ivars are unsupported");
973
974  const llvm::Type *InterfaceLTy =
975    CGM.getTypes().ConvertType(getContext().getObjCInterfaceType(Interface));
976  const llvm::StructLayout *Layout =
977    CGM.getTargetData().getStructLayout(cast<llvm::StructType>(InterfaceLTy));
978  FieldDecl *Field = Interface->lookupFieldDeclForIvar(getContext(), Ivar);
979  uint64_t Offset =
980    Layout->getElementOffset(CGM.getTypes().getLLVMFieldNo(Field));
981
982  return llvm::ConstantInt::get(CGM.getTypes().ConvertType(getContext().LongTy),
983                                Offset);
984}
985
986LValue CodeGenFunction::EmitLValueForIvar(llvm::Value *BaseValue,
987                                          const ObjCIvarDecl *Ivar,
988                                          const FieldDecl *Field,
989                                          unsigned CVRQualifiers) {
990  // See comment in EmitIvarOffset.
991  if (CGM.getObjCRuntime().LateBoundIVars())
992    assert(0 && "late-bound ivars are unsupported");
993  // TODO:  Add a special case for isa (index 0)
994  unsigned Index = CGM.getTypes().getLLVMFieldNo(Field);
995
996  if (Ivar->isBitField()) {
997    return EmitLValueForBitfield(BaseValue, const_cast<FieldDecl *>(Field),
998                                 CVRQualifiers, Index);
999  }
1000  llvm::Value *V = Builder.CreateStructGEP(BaseValue, Index, "tmp");
1001  LValue LV = LValue::MakeAddr(V, Ivar->getType().getCVRQualifiers()|CVRQualifiers);
1002  SetVarDeclObjCAttribute(getContext(), Ivar, Ivar->getType(), LV);
1003  LValue::SetObjCIvar(LV, true);
1004  return LV;
1005}
1006
1007LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
1008  // FIXME: A lot of the code below could be shared with EmitMemberExpr.
1009  llvm::Value *BaseValue = 0;
1010  const Expr *BaseExpr = E->getBase();
1011  unsigned CVRQualifiers = 0;
1012  if (E->isArrow()) {
1013    BaseValue = EmitScalarExpr(BaseExpr);
1014    const PointerType *PTy =
1015      cast<PointerType>(getContext().getCanonicalType(BaseExpr->getType()));
1016    CVRQualifiers = PTy->getPointeeType().getCVRQualifiers();
1017  } else {
1018    LValue BaseLV = EmitLValue(BaseExpr);
1019    // FIXME: this isn't right for bitfields.
1020    BaseValue = BaseLV.getAddress();
1021    CVRQualifiers = BaseExpr->getType().getCVRQualifiers();
1022  }
1023
1024  return EmitLValueForIvar(BaseValue, E->getDecl(),
1025                           getContext().getFieldDecl(E), CVRQualifiers);
1026}
1027
1028LValue
1029CodeGenFunction::EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E) {
1030  // This is a special l-value that just issues sends when we load or
1031  // store through it.
1032  return LValue::MakePropertyRef(E, E->getType().getCVRQualifiers());
1033}
1034
1035LValue
1036CodeGenFunction::EmitObjCKVCRefLValue(const ObjCKVCRefExpr *E) {
1037  // This is a special l-value that just issues sends when we load or
1038  // store through it.
1039  return LValue::MakeKVCRef(E, E->getType().getCVRQualifiers());
1040}
1041
1042LValue
1043CodeGenFunction::EmitObjCSuperExpr(const ObjCSuperExpr *E) {
1044  return EmitUnsupportedLValue(E, "use of super");
1045}
1046
1047RValue CodeGenFunction::EmitCallExpr(llvm::Value *Callee, QualType CalleeType,
1048                                     CallExpr::const_arg_iterator ArgBeg,
1049                                     CallExpr::const_arg_iterator ArgEnd) {
1050  // Get the actual function type. The callee type will always be a
1051  // pointer to function type or a block pointer type.
1052  QualType ResultType;
1053  if (const BlockPointerType *BPT = dyn_cast<BlockPointerType>(CalleeType)) {
1054    ResultType = BPT->getPointeeType()->getAsFunctionType()->getResultType();
1055  } else {
1056    assert(CalleeType->isFunctionPointerType() &&
1057           "Call must have function pointer type!");
1058    QualType FnType = CalleeType->getAsPointerType()->getPointeeType();
1059    ResultType = FnType->getAsFunctionType()->getResultType();
1060  }
1061
1062  CallArgList Args;
1063  for (CallExpr::const_arg_iterator I = ArgBeg; I != ArgEnd; ++I)
1064    Args.push_back(std::make_pair(EmitAnyExprToTemp(*I),
1065                                  I->getType()));
1066
1067  return EmitCall(Callee, ResultType, Args);
1068}
1069