CGDecl.cpp revision 89c49f09b0292dc7c03885f6c765d667a9837597 
1//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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 Decl nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CGDebugInfo.h"
15#include "CodeGenFunction.h"
16#include "CodeGenModule.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/Decl.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/Basic/SourceManager.h"
21#include "clang/Basic/TargetInfo.h"
22#include "clang/Frontend/CompileOptions.h"
23#include "llvm/GlobalVariable.h"
24#include "llvm/Intrinsics.h"
25#include "llvm/Target/TargetData.h"
26#include "llvm/Type.h"
27using namespace clang;
28using namespace CodeGen;
29
30
31void CodeGenFunction::EmitDecl(const Decl &D) {
32  switch (D.getKind()) {
33  default: assert(0 && "Unknown decl kind!");
34  case Decl::ParmVar:
35    assert(0 && "Parmdecls should not be in declstmts!");
36  case Decl::Function:  // void X();
37  case Decl::Record:    // struct/union/class X;
38  case Decl::Enum:      // enum X;
39  case Decl::EnumConstant: // enum ? { X = ? }
40  case Decl::CXXRecord: // struct/union/class X; [C++]
41  case Decl::UsingDirective: // using X; [C++]
42    // None of these decls require codegen support.
43    return;
44
45  case Decl::Var: {
46    const VarDecl &VD = cast<VarDecl>(D);
47    assert(VD.isBlockVarDecl() &&
48           "Should not see file-scope variables inside a function!");
49    return EmitBlockVarDecl(VD);
50  }
51
52  case Decl::Typedef: {   // typedef int X;
53    const TypedefDecl &TD = cast<TypedefDecl>(D);
54    QualType Ty = TD.getUnderlyingType();
55
56    if (Ty->isVariablyModifiedType())
57      EmitVLASize(Ty);
58  }
59  }
60}
61
62/// EmitBlockVarDecl - This method handles emission of any variable declaration
63/// inside a function, including static vars etc.
64void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) {
65  if (D.hasAttr<AsmLabelAttr>())
66    CGM.ErrorUnsupported(&D, "__asm__");
67
68  switch (D.getStorageClass()) {
69  case VarDecl::None:
70  case VarDecl::Auto:
71  case VarDecl::Register:
72    return EmitLocalBlockVarDecl(D);
73  case VarDecl::Static:
74    return EmitStaticBlockVarDecl(D);
75  case VarDecl::Extern:
76  case VarDecl::PrivateExtern:
77    // Don't emit it now, allow it to be emitted lazily on its first use.
78    return;
79  }
80
81  assert(0 && "Unknown storage class");
82}
83
84llvm::GlobalVariable *
85CodeGenFunction::CreateStaticBlockVarDecl(const VarDecl &D,
86                                          const char *Separator,
87                                          llvm::GlobalValue::LinkageTypes
88                                          Linkage) {
89  QualType Ty = D.getType();
90  assert(Ty->isConstantSizeType() && "VLAs can't be static");
91
92  std::string Name;
93  if (getContext().getLangOptions().CPlusPlus) {
94    Name = CGM.getMangledName(&D);
95  } else {
96    std::string ContextName;
97    if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl))
98      ContextName = CGM.getMangledName(FD);
99    else if (isa<ObjCMethodDecl>(CurFuncDecl))
100      ContextName = CurFn->getName();
101    else
102      assert(0 && "Unknown context for block var decl");
103
104    Name = ContextName + Separator + D.getNameAsString();
105  }
106
107  const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty);
108  llvm::GlobalVariable *GV =
109    new llvm::GlobalVariable(CGM.getModule(), LTy,
110                             Ty.isConstant(getContext()), Linkage,
111                             CGM.EmitNullConstant(D.getType()), Name, 0,
112                             D.isThreadSpecified(), Ty.getAddressSpace());
113  GV->setAlignment(getContext().getDeclAlignInBytes(&D));
114  return GV;
115}
116
117void CodeGenFunction::EmitStaticBlockVarDecl(const VarDecl &D) {
118  llvm::Value *&DMEntry = LocalDeclMap[&D];
119  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
120
121  llvm::GlobalVariable *GV =
122    CreateStaticBlockVarDecl(D, ".", llvm::GlobalValue::InternalLinkage);
123
124  // Store into LocalDeclMap before generating initializer to handle
125  // circular references.
126  DMEntry = GV;
127
128  // Make sure to evaluate VLA bounds now so that we have them for later.
129  //
130  // FIXME: Can this happen?
131  if (D.getType()->isVariablyModifiedType())
132    EmitVLASize(D.getType());
133
134  if (D.getInit()) {
135    llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(), D.getType(), this);
136
137    // If constant emission failed, then this should be a C++ static
138    // initializer.
139    if (!Init) {
140      if (!getContext().getLangOptions().CPlusPlus)
141        CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
142      else
143        EmitStaticCXXBlockVarDeclInit(D, GV);
144    } else {
145      // The initializer may differ in type from the global. Rewrite
146      // the global to match the initializer.  (We have to do this
147      // because some types, like unions, can't be completely represented
148      // in the LLVM type system.)
149      if (GV->getType() != Init->getType()) {
150        llvm::GlobalVariable *OldGV = GV;
151
152        GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
153                                      OldGV->isConstant(),
154                                      OldGV->getLinkage(), Init, "",
155                                      0, D.isThreadSpecified(),
156                                      D.getType().getAddressSpace());
157
158        // Steal the name of the old global
159        GV->takeName(OldGV);
160
161        // Replace all uses of the old global with the new global
162        llvm::Constant *NewPtrForOldDecl =
163          llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
164        OldGV->replaceAllUsesWith(NewPtrForOldDecl);
165
166        // Erase the old global, since it is no longer used.
167        OldGV->eraseFromParent();
168      }
169
170      GV->setInitializer(Init);
171    }
172  }
173
174  // FIXME: Merge attribute handling.
175  if (const AnnotateAttr *AA = D.getAttr<AnnotateAttr>()) {
176    SourceManager &SM = CGM.getContext().getSourceManager();
177    llvm::Constant *Ann =
178      CGM.EmitAnnotateAttr(GV, AA,
179                           SM.getInstantiationLineNumber(D.getLocation()));
180    CGM.AddAnnotation(Ann);
181  }
182
183  if (const SectionAttr *SA = D.getAttr<SectionAttr>())
184    GV->setSection(SA->getName());
185
186  if (D.hasAttr<UsedAttr>())
187    CGM.AddUsedGlobal(GV);
188
189  // We may have to cast the constant because of the initializer
190  // mismatch above.
191  //
192  // FIXME: It is really dangerous to store this in the map; if anyone
193  // RAUW's the GV uses of this constant will be invalid.
194  const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType());
195  const llvm::Type *LPtrTy =
196    llvm::PointerType::get(LTy, D.getType().getAddressSpace());
197  DMEntry = llvm::ConstantExpr::getBitCast(GV, LPtrTy);
198
199  // Emit global variable debug descriptor for static vars.
200  CGDebugInfo *DI = getDebugInfo();
201  if (DI) {
202    DI->setLocation(D.getLocation());
203    DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(GV), &D);
204  }
205}
206
207unsigned CodeGenFunction::getByRefValueLLVMField(const ValueDecl *VD) const {
208  assert(ByRefValueInfo.count(VD) && "Did not find value!");
209
210  return ByRefValueInfo.find(VD)->second.second;
211}
212
213/// BuildByRefType - This routine changes a __block variable declared as T x
214///   into:
215///
216///      struct {
217///        void *__isa;
218///        void *__forwarding;
219///        int32_t __flags;
220///        int32_t __size;
221///        void *__copy_helper;       // only if needed
222///        void *__destroy_helper;    // only if needed
223///        char padding[X];           // only if needed
224///        T x;
225///      } x
226///
227const llvm::Type *CodeGenFunction::BuildByRefType(const ValueDecl *D) {
228  std::pair<const llvm::Type *, unsigned> &Info = ByRefValueInfo[D];
229  if (Info.first)
230    return Info.first;
231
232  QualType Ty = D->getType();
233
234  std::vector<const llvm::Type *> Types;
235
236  const llvm::PointerType *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
237
238  llvm::PATypeHolder ByRefTypeHolder = llvm::OpaqueType::get(VMContext);
239
240  // void *__isa;
241  Types.push_back(Int8PtrTy);
242
243  // void *__forwarding;
244  Types.push_back(llvm::PointerType::getUnqual(ByRefTypeHolder));
245
246  // int32_t __flags;
247  Types.push_back(llvm::Type::getInt32Ty(VMContext));
248
249  // int32_t __size;
250  Types.push_back(llvm::Type::getInt32Ty(VMContext));
251
252  bool HasCopyAndDispose = BlockRequiresCopying(Ty);
253  if (HasCopyAndDispose) {
254    /// void *__copy_helper;
255    Types.push_back(Int8PtrTy);
256
257    /// void *__destroy_helper;
258    Types.push_back(Int8PtrTy);
259  }
260
261  bool Packed = false;
262  unsigned Align = getContext().getDeclAlignInBytes(D);
263  if (Align > Target.getPointerAlign(0) / 8) {
264    // We have to insert padding.
265
266    // The struct above has 2 32-bit integers.
267    unsigned CurrentOffsetInBytes = 4 * 2;
268
269    // And either 2 or 4 pointers.
270    CurrentOffsetInBytes += (HasCopyAndDispose ? 4 : 2) *
271      CGM.getTargetData().getTypeAllocSize(Int8PtrTy);
272
273    // Align the offset.
274    unsigned AlignedOffsetInBytes =
275      llvm::RoundUpToAlignment(CurrentOffsetInBytes, Align);
276
277    unsigned NumPaddingBytes = AlignedOffsetInBytes - CurrentOffsetInBytes;
278    if (NumPaddingBytes > 0) {
279      const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext);
280      // FIXME: We need a sema error for alignment larger than the minimum of
281      // the maximal stack alignmint and the alignment of malloc on the system.
282      if (NumPaddingBytes > 1)
283        Ty = llvm::ArrayType::get(Ty, NumPaddingBytes);
284
285      Types.push_back(Ty);
286
287      // We want a packed struct.
288      Packed = true;
289    }
290  }
291
292  // T x;
293  Types.push_back(ConvertType(Ty));
294
295  const llvm::Type *T = llvm::StructType::get(VMContext, Types, Packed);
296
297  cast<llvm::OpaqueType>(ByRefTypeHolder.get())->refineAbstractTypeTo(T);
298  CGM.getModule().addTypeName("struct.__block_byref_" + D->getNameAsString(),
299                              ByRefTypeHolder.get());
300
301  Info.first = ByRefTypeHolder.get();
302
303  Info.second = Types.size() - 1;
304
305  return Info.first;
306}
307
308/// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a
309/// variable declaration with auto, register, or no storage class specifier.
310/// These turn into simple stack objects, or GlobalValues depending on target.
311void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
312  QualType Ty = D.getType();
313  bool isByRef = D.hasAttr<BlocksAttr>();
314  bool needsDispose = false;
315  unsigned Align = 0;
316
317  llvm::Value *DeclPtr;
318  if (Ty->isConstantSizeType()) {
319    if (!Target.useGlobalsForAutomaticVariables()) {
320
321      // All constant structs and arrays should be global if
322      // their initializer is constant and if the element type is POD.
323      if (CGM.getCompileOpts().MergeAllConstants) {
324        if (Ty.isConstant(getContext())
325            && (Ty->isArrayType() || Ty->isRecordType())
326            && (D.getInit()
327                && D.getInit()->isConstantInitializer(getContext()))
328            && Ty->isPODType()) {
329          EmitStaticBlockVarDecl(D);
330          return;
331        }
332      }
333
334      // A normal fixed sized variable becomes an alloca in the entry block.
335      const llvm::Type *LTy = ConvertTypeForMem(Ty);
336      Align = getContext().getDeclAlignInBytes(&D);
337      if (isByRef)
338        LTy = BuildByRefType(&D);
339      llvm::AllocaInst *Alloc = CreateTempAlloca(LTy);
340      Alloc->setName(D.getNameAsString().c_str());
341
342      if (isByRef)
343        Align = std::max(Align, unsigned(Target.getPointerAlign(0) / 8));
344      Alloc->setAlignment(Align);
345      DeclPtr = Alloc;
346    } else {
347      // Targets that don't support recursion emit locals as globals.
348      const char *Class =
349        D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto.";
350      DeclPtr = CreateStaticBlockVarDecl(D, Class,
351                                         llvm::GlobalValue
352                                         ::InternalLinkage);
353    }
354
355    // FIXME: Can this happen?
356    if (Ty->isVariablyModifiedType())
357      EmitVLASize(Ty);
358  } else {
359    EnsureInsertPoint();
360
361    if (!DidCallStackSave) {
362      // Save the stack.
363      const llvm::Type *LTy = llvm::Type::getInt8PtrTy(VMContext);
364      llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack");
365
366      llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
367      llvm::Value *V = Builder.CreateCall(F);
368
369      Builder.CreateStore(V, Stack);
370
371      DidCallStackSave = true;
372
373      {
374        // Push a cleanup block and restore the stack there.
375        CleanupScope scope(*this);
376
377        V = Builder.CreateLoad(Stack, "tmp");
378        llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
379        Builder.CreateCall(F, V);
380      }
381    }
382
383    // Get the element type.
384    const llvm::Type *LElemTy = ConvertTypeForMem(Ty);
385    const llvm::Type *LElemPtrTy =
386      llvm::PointerType::get(LElemTy, D.getType().getAddressSpace());
387
388    llvm::Value *VLASize = EmitVLASize(Ty);
389
390    // Downcast the VLA size expression
391    VLASize = Builder.CreateIntCast(VLASize, llvm::Type::getInt32Ty(VMContext),
392                                    false, "tmp");
393
394    // Allocate memory for the array.
395    llvm::AllocaInst *VLA =
396      Builder.CreateAlloca(llvm::Type::getInt8Ty(VMContext), VLASize, "vla");
397    VLA->setAlignment(getContext().getDeclAlignInBytes(&D));
398
399    DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp");
400  }
401
402  llvm::Value *&DMEntry = LocalDeclMap[&D];
403  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
404  DMEntry = DeclPtr;
405
406  // Emit debug info for local var declaration.
407  if (CGDebugInfo *DI = getDebugInfo()) {
408    assert(HaveInsertPoint() && "Unexpected unreachable point!");
409
410    DI->setLocation(D.getLocation());
411    if (Target.useGlobalsForAutomaticVariables()) {
412      DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(DeclPtr), &D);
413    } else
414      DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder);
415  }
416
417  // If this local has an initializer, emit it now.
418  const Expr *Init = D.getInit();
419
420  // If we are at an unreachable point, we don't need to emit the initializer
421  // unless it contains a label.
422  if (!HaveInsertPoint()) {
423    if (!ContainsLabel(Init))
424      Init = 0;
425    else
426      EnsureInsertPoint();
427  }
428
429  if (Init) {
430    llvm::Value *Loc = DeclPtr;
431    if (isByRef)
432      Loc = Builder.CreateStructGEP(DeclPtr, getByRefValueLLVMField(&D),
433                                    D.getNameAsString());
434
435    bool isVolatile = (getContext().getCanonicalType(D.getType())
436                       .isVolatileQualified());
437    if (Ty->isReferenceType()) {
438      RValue RV = EmitReferenceBindingToExpr(Init, Ty, /*IsInitializer=*/true);
439      EmitStoreOfScalar(RV.getScalarVal(), Loc, false, Ty);
440    } else if (!hasAggregateLLVMType(Init->getType())) {
441      llvm::Value *V = EmitScalarExpr(Init);
442      EmitStoreOfScalar(V, Loc, isVolatile, D.getType());
443    } else if (Init->getType()->isAnyComplexType()) {
444      EmitComplexExprIntoAddr(Init, Loc, isVolatile);
445    } else {
446      EmitAggExpr(Init, Loc, isVolatile);
447    }
448  }
449
450  if (isByRef) {
451    const llvm::PointerType *PtrToInt8Ty = llvm::Type::getInt8PtrTy(VMContext);
452
453    EnsureInsertPoint();
454    llvm::Value *isa_field = Builder.CreateStructGEP(DeclPtr, 0);
455    llvm::Value *forwarding_field = Builder.CreateStructGEP(DeclPtr, 1);
456    llvm::Value *flags_field = Builder.CreateStructGEP(DeclPtr, 2);
457    llvm::Value *size_field = Builder.CreateStructGEP(DeclPtr, 3);
458    llvm::Value *V;
459    int flag = 0;
460    int flags = 0;
461
462    needsDispose = true;
463
464    if (Ty->isBlockPointerType()) {
465      flag |= BLOCK_FIELD_IS_BLOCK;
466      flags |= BLOCK_HAS_COPY_DISPOSE;
467    } else if (BlockRequiresCopying(Ty)) {
468      flag |= BLOCK_FIELD_IS_OBJECT;
469      flags |= BLOCK_HAS_COPY_DISPOSE;
470    }
471
472    // FIXME: Someone double check this.
473    if (Ty.isObjCGCWeak())
474      flag |= BLOCK_FIELD_IS_WEAK;
475
476    int isa = 0;
477    if (flag&BLOCK_FIELD_IS_WEAK)
478      isa = 1;
479    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), isa);
480    V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "isa");
481    Builder.CreateStore(V, isa_field);
482
483    Builder.CreateStore(DeclPtr, forwarding_field);
484
485    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), flags);
486    Builder.CreateStore(V, flags_field);
487
488    const llvm::Type *V1;
489    V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType();
490    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
491                               (CGM.getTargetData().getTypeStoreSizeInBits(V1)
492                                / 8));
493    Builder.CreateStore(V, size_field);
494
495    if (flags & BLOCK_HAS_COPY_DISPOSE) {
496      BlockHasCopyDispose = true;
497      llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4);
498      Builder.CreateStore(BuildbyrefCopyHelper(DeclPtr->getType(), flag, Align),
499                          copy_helper);
500
501      llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5);
502      Builder.CreateStore(BuildbyrefDestroyHelper(DeclPtr->getType(), flag,
503                                                  Align),
504                          destroy_helper);
505    }
506  }
507
508  // Handle CXX destruction of variables.
509  QualType DtorTy(Ty);
510  while (const ArrayType *Array = getContext().getAsArrayType(DtorTy))
511    DtorTy = getContext().getBaseElementType(Array);
512  if (const RecordType *RT = DtorTy->getAs<RecordType>())
513    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
514      if (!ClassDecl->hasTrivialDestructor()) {
515        const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext());
516        assert(D && "EmitLocalBlockVarDecl - destructor is nul");
517
518        if (const ConstantArrayType *Array =
519              getContext().getAsConstantArrayType(Ty)) {
520          CleanupScope Scope(*this);
521          QualType BaseElementTy = getContext().getBaseElementType(Array);
522          const llvm::Type *BasePtr = ConvertType(BaseElementTy);
523          BasePtr = llvm::PointerType::getUnqual(BasePtr);
524          llvm::Value *BaseAddrPtr =
525            Builder.CreateBitCast(DeclPtr, BasePtr);
526          EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr);
527
528          // Make sure to jump to the exit block.
529          EmitBranch(Scope.getCleanupExitBlock());
530        } else {
531          CleanupScope Scope(*this);
532          EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
533        }
534      }
535  }
536
537  // Handle the cleanup attribute
538  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
539    const FunctionDecl *FD = CA->getFunctionDecl();
540
541    llvm::Constant* F = CGM.GetAddrOfFunction(FD);
542    assert(F && "Could not find function!");
543
544    CleanupScope scope(*this);
545
546    const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD);
547
548    // In some cases, the type of the function argument will be different from
549    // the type of the pointer. An example of this is
550    // void f(void* arg);
551    // __attribute__((cleanup(f))) void *g;
552    //
553    // To fix this we insert a bitcast here.
554    QualType ArgTy = Info.arg_begin()->type;
555    DeclPtr = Builder.CreateBitCast(DeclPtr, ConvertType(ArgTy));
556
557    CallArgList Args;
558    Args.push_back(std::make_pair(RValue::get(DeclPtr),
559                                  getContext().getPointerType(D.getType())));
560
561    EmitCall(Info, F, Args);
562  }
563
564  if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) {
565    CleanupScope scope(*this);
566    llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
567    V = Builder.CreateLoad(V, false);
568    BuildBlockRelease(V);
569  }
570}
571
572/// Emit an alloca (or GlobalValue depending on target)
573/// for the specified parameter and set up LocalDeclMap.
574void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg) {
575  // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
576  assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
577         "Invalid argument to EmitParmDecl");
578  QualType Ty = D.getType();
579  CanQualType CTy = getContext().getCanonicalType(Ty);
580
581  llvm::Value *DeclPtr;
582  if (!Ty->isConstantSizeType()) {
583    // Variable sized values always are passed by-reference.
584    DeclPtr = Arg;
585  } else {
586    // A fixed sized single-value variable becomes an alloca in the entry block.
587    const llvm::Type *LTy = ConvertTypeForMem(Ty);
588    if (LTy->isSingleValueType()) {
589      // TODO: Alignment
590      std::string Name = D.getNameAsString();
591      Name += ".addr";
592      DeclPtr = CreateTempAlloca(LTy);
593      DeclPtr->setName(Name.c_str());
594
595      // Store the initial value into the alloca.
596      EmitStoreOfScalar(Arg, DeclPtr, CTy.isVolatileQualified(), Ty);
597    } else {
598      // Otherwise, if this is an aggregate, just use the input pointer.
599      DeclPtr = Arg;
600    }
601    Arg->setName(D.getNameAsString());
602  }
603
604  llvm::Value *&DMEntry = LocalDeclMap[&D];
605  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
606  DMEntry = DeclPtr;
607
608  // Emit debug info for param declaration.
609  if (CGDebugInfo *DI = getDebugInfo()) {
610    DI->setLocation(D.getLocation());
611    DI->EmitDeclareOfArgVariable(&D, DeclPtr, Builder);
612  }
613}
614
615