CGDebugInfo.cpp revision 912964863c344dd84976ee281bd213d0485645ba 
1//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
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 coordinates the debug information generation while generating code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CGDebugInfo.h"
15#include "CGBlocks.h"
16#include "CGCXXABI.h"
17#include "CGObjCRuntime.h"
18#include "CodeGenFunction.h"
19#include "CodeGenModule.h"
20#include "clang/AST/ASTContext.h"
21#include "clang/AST/DeclFriend.h"
22#include "clang/AST/DeclObjC.h"
23#include "clang/AST/DeclTemplate.h"
24#include "clang/AST/Expr.h"
25#include "clang/AST/RecordLayout.h"
26#include "clang/Basic/FileManager.h"
27#include "clang/Basic/SourceManager.h"
28#include "clang/Basic/Version.h"
29#include "clang/Frontend/CodeGenOptions.h"
30#include "llvm/ADT/SmallVector.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/IR/Constants.h"
33#include "llvm/IR/DataLayout.h"
34#include "llvm/IR/DerivedTypes.h"
35#include "llvm/IR/Instructions.h"
36#include "llvm/IR/Intrinsics.h"
37#include "llvm/IR/Module.h"
38#include "llvm/Support/Dwarf.h"
39#include "llvm/Support/FileSystem.h"
40using namespace clang;
41using namespace clang::CodeGen;
42
43CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
44  : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
45    DBuilder(CGM.getModule()),
46    BlockLiteralGenericSet(false) {
47  CreateCompileUnit();
48}
49
50CGDebugInfo::~CGDebugInfo() {
51  assert(LexicalBlockStack.empty() &&
52         "Region stack mismatch, stack not empty!");
53}
54
55void CGDebugInfo::setLocation(SourceLocation Loc) {
56  // If the new location isn't valid return.
57  if (!Loc.isValid()) return;
58
59  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
60
61  // If we've changed files in the middle of a lexical scope go ahead
62  // and create a new lexical scope with file node if it's different
63  // from the one in the scope.
64  if (LexicalBlockStack.empty()) return;
65
66  SourceManager &SM = CGM.getContext().getSourceManager();
67  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
68  PresumedLoc PPLoc = SM.getPresumedLoc(PrevLoc);
69
70  if (PCLoc.isInvalid() || PPLoc.isInvalid() ||
71      !strcmp(PPLoc.getFilename(), PCLoc.getFilename()))
72    return;
73
74  llvm::MDNode *LB = LexicalBlockStack.back();
75  llvm::DIScope Scope = llvm::DIScope(LB);
76  if (Scope.isLexicalBlockFile()) {
77    llvm::DILexicalBlockFile LBF = llvm::DILexicalBlockFile(LB);
78    llvm::DIDescriptor D
79      = DBuilder.createLexicalBlockFile(LBF.getScope(),
80                                        getOrCreateFile(CurLoc));
81    llvm::MDNode *N = D;
82    LexicalBlockStack.pop_back();
83    LexicalBlockStack.push_back(N);
84  } else if (Scope.isLexicalBlock() || Scope.isSubprogram()) {
85    llvm::DIDescriptor D
86      = DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc));
87    llvm::MDNode *N = D;
88    LexicalBlockStack.pop_back();
89    LexicalBlockStack.push_back(N);
90  }
91}
92
93/// getContextDescriptor - Get context info for the decl.
94llvm::DIScope CGDebugInfo::getContextDescriptor(const Decl *Context) {
95  if (!Context)
96    return TheCU;
97
98  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
99    I = RegionMap.find(Context);
100  if (I != RegionMap.end()) {
101    llvm::Value *V = I->second;
102    return llvm::DIScope(dyn_cast_or_null<llvm::MDNode>(V));
103  }
104
105  // Check namespace.
106  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
107    return getOrCreateNameSpace(NSDecl);
108
109  if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context))
110    if (!RDecl->isDependentType())
111      return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
112                                        getOrCreateMainFile());
113  return TheCU;
114}
115
116/// getFunctionName - Get function name for the given FunctionDecl. If the
117/// name is constructred on demand (e.g. C++ destructor) then the name
118/// is stored on the side.
119StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
120  assert (FD && "Invalid FunctionDecl!");
121  IdentifierInfo *FII = FD->getIdentifier();
122  FunctionTemplateSpecializationInfo *Info
123    = FD->getTemplateSpecializationInfo();
124  if (!Info && FII)
125    return FII->getName();
126
127  // Otherwise construct human readable name for debug info.
128  SmallString<128> NS;
129  llvm::raw_svector_ostream OS(NS);
130  FD->printName(OS);
131
132  // Add any template specialization args.
133  if (Info) {
134    const TemplateArgumentList *TArgs = Info->TemplateArguments;
135    const TemplateArgument *Args = TArgs->data();
136    unsigned NumArgs = TArgs->size();
137    PrintingPolicy Policy(CGM.getLangOpts());
138    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
139                                                          Policy);
140  }
141
142  // Copy this name on the side and use its reference.
143  OS.flush();
144  char *StrPtr = DebugInfoNames.Allocate<char>(NS.size());
145  memcpy(StrPtr, NS.data(), NS.size());
146  return StringRef(StrPtr, NS.size());
147}
148
149StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
150  SmallString<256> MethodName;
151  llvm::raw_svector_ostream OS(MethodName);
152  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
153  const DeclContext *DC = OMD->getDeclContext();
154  if (const ObjCImplementationDecl *OID =
155      dyn_cast<const ObjCImplementationDecl>(DC)) {
156     OS << OID->getName();
157  } else if (const ObjCInterfaceDecl *OID =
158             dyn_cast<const ObjCInterfaceDecl>(DC)) {
159      OS << OID->getName();
160  } else if (const ObjCCategoryImplDecl *OCD =
161             dyn_cast<const ObjCCategoryImplDecl>(DC)){
162      OS << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '(' <<
163          OCD->getIdentifier()->getNameStart() << ')';
164  } else if (isa<ObjCProtocolDecl>(DC)) {
165    // We can extract the type of the class from the self pointer.
166    if (ImplicitParamDecl* SelfDecl = OMD->getSelfDecl()) {
167      QualType ClassTy =
168        cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
169      ClassTy.print(OS, PrintingPolicy(LangOptions()));
170    }
171  }
172  OS << ' ' << OMD->getSelector().getAsString() << ']';
173
174  char *StrPtr = DebugInfoNames.Allocate<char>(OS.tell());
175  memcpy(StrPtr, MethodName.begin(), OS.tell());
176  return StringRef(StrPtr, OS.tell());
177}
178
179/// getSelectorName - Return selector name. This is used for debugging
180/// info.
181StringRef CGDebugInfo::getSelectorName(Selector S) {
182  const std::string &SName = S.getAsString();
183  char *StrPtr = DebugInfoNames.Allocate<char>(SName.size());
184  memcpy(StrPtr, SName.data(), SName.size());
185  return StringRef(StrPtr, SName.size());
186}
187
188/// getClassName - Get class name including template argument list.
189StringRef
190CGDebugInfo::getClassName(const RecordDecl *RD) {
191  const ClassTemplateSpecializationDecl *Spec
192    = dyn_cast<ClassTemplateSpecializationDecl>(RD);
193  if (!Spec)
194    return RD->getName();
195
196  const TemplateArgument *Args;
197  unsigned NumArgs;
198  if (TypeSourceInfo *TAW = Spec->getTypeAsWritten()) {
199    const TemplateSpecializationType *TST =
200      cast<TemplateSpecializationType>(TAW->getType());
201    Args = TST->getArgs();
202    NumArgs = TST->getNumArgs();
203  } else {
204    const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
205    Args = TemplateArgs.data();
206    NumArgs = TemplateArgs.size();
207  }
208  StringRef Name = RD->getIdentifier()->getName();
209  PrintingPolicy Policy(CGM.getLangOpts());
210  SmallString<128> TemplateArgList;
211  {
212    llvm::raw_svector_ostream OS(TemplateArgList);
213    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
214                                                          Policy);
215  }
216
217  // Copy this name on the side and use its reference.
218  size_t Length = Name.size() + TemplateArgList.size();
219  char *StrPtr = DebugInfoNames.Allocate<char>(Length);
220  memcpy(StrPtr, Name.data(), Name.size());
221  memcpy(StrPtr + Name.size(), TemplateArgList.data(), TemplateArgList.size());
222  return StringRef(StrPtr, Length);
223}
224
225/// getOrCreateFile - Get the file debug info descriptor for the input location.
226llvm::DIFile CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
227  if (!Loc.isValid())
228    // If Location is not valid then use main input file.
229    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
230
231  SourceManager &SM = CGM.getContext().getSourceManager();
232  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
233
234  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
235    // If the location is not valid then use main input file.
236    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
237
238  // Cache the results.
239  const char *fname = PLoc.getFilename();
240  llvm::DenseMap<const char *, llvm::WeakVH>::iterator it =
241    DIFileCache.find(fname);
242
243  if (it != DIFileCache.end()) {
244    // Verify that the information still exists.
245    if (llvm::Value *V = it->second)
246      return llvm::DIFile(cast<llvm::MDNode>(V));
247  }
248
249  llvm::DIFile F = DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
250
251  DIFileCache[fname] = F;
252  return F;
253}
254
255/// getOrCreateMainFile - Get the file info for main compile unit.
256llvm::DIFile CGDebugInfo::getOrCreateMainFile() {
257  return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
258}
259
260/// getLineNumber - Get line number for the location. If location is invalid
261/// then use current location.
262unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
263  if (Loc.isInvalid() && CurLoc.isInvalid())
264    return 0;
265  SourceManager &SM = CGM.getContext().getSourceManager();
266  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
267  return PLoc.isValid()? PLoc.getLine() : 0;
268}
269
270/// getColumnNumber - Get column number for the location.
271unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
272  // We may not want column information at all.
273  if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
274    return 0;
275
276  // If the location is invalid then use the current column.
277  if (Loc.isInvalid() && CurLoc.isInvalid())
278    return 0;
279  SourceManager &SM = CGM.getContext().getSourceManager();
280  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
281  return PLoc.isValid()? PLoc.getColumn() : 0;
282}
283
284StringRef CGDebugInfo::getCurrentDirname() {
285  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
286    return CGM.getCodeGenOpts().DebugCompilationDir;
287
288  if (!CWDName.empty())
289    return CWDName;
290  SmallString<256> CWD;
291  llvm::sys::fs::current_path(CWD);
292  char *CompDirnamePtr = DebugInfoNames.Allocate<char>(CWD.size());
293  memcpy(CompDirnamePtr, CWD.data(), CWD.size());
294  return CWDName = StringRef(CompDirnamePtr, CWD.size());
295}
296
297/// CreateCompileUnit - Create new compile unit.
298void CGDebugInfo::CreateCompileUnit() {
299
300  // Get absolute path name.
301  SourceManager &SM = CGM.getContext().getSourceManager();
302  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
303  if (MainFileName.empty())
304    MainFileName = "<unknown>";
305
306  // The main file name provided via the "-main-file-name" option contains just
307  // the file name itself with no path information. This file name may have had
308  // a relative path, so we look into the actual file entry for the main
309  // file to determine the real absolute path for the file.
310  std::string MainFileDir;
311  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
312    MainFileDir = MainFile->getDir()->getName();
313    if (MainFileDir != ".")
314      MainFileName = MainFileDir + "/" + MainFileName;
315  }
316
317  // Save filename string.
318  char *FilenamePtr = DebugInfoNames.Allocate<char>(MainFileName.length());
319  memcpy(FilenamePtr, MainFileName.c_str(), MainFileName.length());
320  StringRef Filename(FilenamePtr, MainFileName.length());
321
322  // Save split dwarf file string.
323  std::string SplitDwarfFile = CGM.getCodeGenOpts().SplitDwarfFile;
324  char *SplitDwarfPtr = DebugInfoNames.Allocate<char>(SplitDwarfFile.length());
325  memcpy(SplitDwarfPtr, SplitDwarfFile.c_str(), SplitDwarfFile.length());
326  StringRef SplitDwarfFilename(SplitDwarfPtr, SplitDwarfFile.length());
327
328  unsigned LangTag;
329  const LangOptions &LO = CGM.getLangOpts();
330  if (LO.CPlusPlus) {
331    if (LO.ObjC1)
332      LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
333    else
334      LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
335  } else if (LO.ObjC1) {
336    LangTag = llvm::dwarf::DW_LANG_ObjC;
337  } else if (LO.C99) {
338    LangTag = llvm::dwarf::DW_LANG_C99;
339  } else {
340    LangTag = llvm::dwarf::DW_LANG_C89;
341  }
342
343  std::string Producer = getClangFullVersion();
344
345  // Figure out which version of the ObjC runtime we have.
346  unsigned RuntimeVers = 0;
347  if (LO.ObjC1)
348    RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
349
350  // Create new compile unit.
351  DBuilder.createCompileUnit(LangTag, Filename, getCurrentDirname(),
352                             Producer, LO.Optimize,
353                             CGM.getCodeGenOpts().DwarfDebugFlags,
354                             RuntimeVers, SplitDwarfFilename);
355  // FIXME - Eliminate TheCU.
356  TheCU = llvm::DICompileUnit(DBuilder.getCU());
357}
358
359/// CreateType - Get the Basic type from the cache or create a new
360/// one if necessary.
361llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
362  unsigned Encoding = 0;
363  StringRef BTName;
364  switch (BT->getKind()) {
365#define BUILTIN_TYPE(Id, SingletonId)
366#define PLACEHOLDER_TYPE(Id, SingletonId) \
367  case BuiltinType::Id:
368#include "clang/AST/BuiltinTypes.def"
369  case BuiltinType::Dependent:
370    llvm_unreachable("Unexpected builtin type");
371  case BuiltinType::NullPtr:
372    return DBuilder.
373      createNullPtrType(BT->getName(CGM.getLangOpts()));
374  case BuiltinType::Void:
375    return llvm::DIType();
376  case BuiltinType::ObjCClass:
377    if (ClassTy.Verify())
378      return ClassTy;
379    ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
380                                         "objc_class", TheCU,
381                                         getOrCreateMainFile(), 0);
382    return ClassTy;
383  case BuiltinType::ObjCId: {
384    // typedef struct objc_class *Class;
385    // typedef struct objc_object {
386    //  Class isa;
387    // } *id;
388
389    if (ObjTy.Verify())
390      return ObjTy;
391
392    if (!ClassTy.Verify())
393      ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
394                                           "objc_class", TheCU,
395                                           getOrCreateMainFile(), 0);
396
397    unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
398
399    llvm::DIType ISATy = DBuilder.createPointerType(ClassTy, Size);
400
401    ObjTy =
402        DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
403                                  0, 0, 0, 0, llvm::DIType(), llvm::DIArray());
404
405    ObjTy.setTypeArray(DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
406        ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0, 0, ISATy)));
407    return ObjTy;
408  }
409  case BuiltinType::ObjCSel: {
410    if (SelTy.Verify())
411      return SelTy;
412    SelTy =
413      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
414                                 "objc_selector", TheCU, getOrCreateMainFile(),
415                                 0);
416    return SelTy;
417  }
418
419  case BuiltinType::OCLImage1d:
420    return getOrCreateStructPtrType("opencl_image1d_t",
421                                    OCLImage1dDITy);
422  case BuiltinType::OCLImage1dArray:
423    return getOrCreateStructPtrType("opencl_image1d_array_t",
424                                    OCLImage1dArrayDITy);
425  case BuiltinType::OCLImage1dBuffer:
426    return getOrCreateStructPtrType("opencl_image1d_buffer_t",
427                                    OCLImage1dBufferDITy);
428  case BuiltinType::OCLImage2d:
429    return getOrCreateStructPtrType("opencl_image2d_t",
430                                    OCLImage2dDITy);
431  case BuiltinType::OCLImage2dArray:
432    return getOrCreateStructPtrType("opencl_image2d_array_t",
433                                    OCLImage2dArrayDITy);
434  case BuiltinType::OCLImage3d:
435    return getOrCreateStructPtrType("opencl_image3d_t",
436                                    OCLImage3dDITy);
437  case BuiltinType::OCLSampler:
438    return DBuilder.createBasicType("opencl_sampler_t",
439                                    CGM.getContext().getTypeSize(BT),
440                                    CGM.getContext().getTypeAlign(BT),
441                                    llvm::dwarf::DW_ATE_unsigned);
442  case BuiltinType::OCLEvent:
443    return getOrCreateStructPtrType("opencl_event_t",
444                                    OCLEventDITy);
445
446  case BuiltinType::UChar:
447  case BuiltinType::Char_U: Encoding = llvm::dwarf::DW_ATE_unsigned_char; break;
448  case BuiltinType::Char_S:
449  case BuiltinType::SChar: Encoding = llvm::dwarf::DW_ATE_signed_char; break;
450  case BuiltinType::Char16:
451  case BuiltinType::Char32: Encoding = llvm::dwarf::DW_ATE_UTF; break;
452  case BuiltinType::UShort:
453  case BuiltinType::UInt:
454  case BuiltinType::UInt128:
455  case BuiltinType::ULong:
456  case BuiltinType::WChar_U:
457  case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
458  case BuiltinType::Short:
459  case BuiltinType::Int:
460  case BuiltinType::Int128:
461  case BuiltinType::Long:
462  case BuiltinType::WChar_S:
463  case BuiltinType::LongLong:  Encoding = llvm::dwarf::DW_ATE_signed; break;
464  case BuiltinType::Bool:      Encoding = llvm::dwarf::DW_ATE_boolean; break;
465  case BuiltinType::Half:
466  case BuiltinType::Float:
467  case BuiltinType::LongDouble:
468  case BuiltinType::Double:    Encoding = llvm::dwarf::DW_ATE_float; break;
469  }
470
471  switch (BT->getKind()) {
472  case BuiltinType::Long:      BTName = "long int"; break;
473  case BuiltinType::LongLong:  BTName = "long long int"; break;
474  case BuiltinType::ULong:     BTName = "long unsigned int"; break;
475  case BuiltinType::ULongLong: BTName = "long long unsigned int"; break;
476  default:
477    BTName = BT->getName(CGM.getLangOpts());
478    break;
479  }
480  // Bit size, align and offset of the type.
481  uint64_t Size = CGM.getContext().getTypeSize(BT);
482  uint64_t Align = CGM.getContext().getTypeAlign(BT);
483  llvm::DIType DbgTy =
484    DBuilder.createBasicType(BTName, Size, Align, Encoding);
485  return DbgTy;
486}
487
488llvm::DIType CGDebugInfo::CreateType(const ComplexType *Ty) {
489  // Bit size, align and offset of the type.
490  unsigned Encoding = llvm::dwarf::DW_ATE_complex_float;
491  if (Ty->isComplexIntegerType())
492    Encoding = llvm::dwarf::DW_ATE_lo_user;
493
494  uint64_t Size = CGM.getContext().getTypeSize(Ty);
495  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
496  llvm::DIType DbgTy =
497    DBuilder.createBasicType("complex", Size, Align, Encoding);
498
499  return DbgTy;
500}
501
502/// CreateCVRType - Get the qualified type from the cache or create
503/// a new one if necessary.
504llvm::DIType CGDebugInfo::CreateQualifiedType(QualType Ty, llvm::DIFile Unit) {
505  QualifierCollector Qc;
506  const Type *T = Qc.strip(Ty);
507
508  // Ignore these qualifiers for now.
509  Qc.removeObjCGCAttr();
510  Qc.removeAddressSpace();
511  Qc.removeObjCLifetime();
512
513  // We will create one Derived type for one qualifier and recurse to handle any
514  // additional ones.
515  unsigned Tag;
516  if (Qc.hasConst()) {
517    Tag = llvm::dwarf::DW_TAG_const_type;
518    Qc.removeConst();
519  } else if (Qc.hasVolatile()) {
520    Tag = llvm::dwarf::DW_TAG_volatile_type;
521    Qc.removeVolatile();
522  } else if (Qc.hasRestrict()) {
523    Tag = llvm::dwarf::DW_TAG_restrict_type;
524    Qc.removeRestrict();
525  } else {
526    assert(Qc.empty() && "Unknown type qualifier for debug info");
527    return getOrCreateType(QualType(T, 0), Unit);
528  }
529
530  llvm::DIType FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
531
532  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
533  // CVR derived types.
534  llvm::DIType DbgTy = DBuilder.createQualifiedType(Tag, FromTy);
535
536  return DbgTy;
537}
538
539llvm::DIType CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
540                                     llvm::DIFile Unit) {
541
542  // The frontend treats 'id' as a typedef to an ObjCObjectType,
543  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
544  // debug info, we want to emit 'id' in both cases.
545  if (Ty->isObjCQualifiedIdType())
546      return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
547
548  llvm::DIType DbgTy =
549    CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
550                          Ty->getPointeeType(), Unit);
551  return DbgTy;
552}
553
554llvm::DIType CGDebugInfo::CreateType(const PointerType *Ty,
555                                     llvm::DIFile Unit) {
556  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
557                               Ty->getPointeeType(), Unit);
558}
559
560// Creates a forward declaration for a RecordDecl in the given context.
561llvm::DIType CGDebugInfo::createRecordFwdDecl(const RecordDecl *RD,
562                                              llvm::DIDescriptor Ctx) {
563  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
564  unsigned Line = getLineNumber(RD->getLocation());
565  StringRef RDName = getClassName(RD);
566
567  unsigned Tag = 0;
568  if (RD->isStruct() || RD->isInterface())
569    Tag = llvm::dwarf::DW_TAG_structure_type;
570  else if (RD->isUnion())
571    Tag = llvm::dwarf::DW_TAG_union_type;
572  else {
573    assert(RD->isClass());
574    Tag = llvm::dwarf::DW_TAG_class_type;
575  }
576
577  // Create the type.
578  return DBuilder.createForwardDecl(Tag, RDName, Ctx, DefUnit, Line);
579}
580
581// Walk up the context chain and create forward decls for record decls,
582// and normal descriptors for namespaces.
583llvm::DIDescriptor CGDebugInfo::createContextChain(const Decl *Context) {
584  if (!Context)
585    return TheCU;
586
587  // See if we already have the parent.
588  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
589    I = RegionMap.find(Context);
590  if (I != RegionMap.end()) {
591    llvm::Value *V = I->second;
592    return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
593  }
594
595  // Check namespace.
596  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
597    return llvm::DIDescriptor(getOrCreateNameSpace(NSDecl));
598
599  if (const RecordDecl *RD = dyn_cast<RecordDecl>(Context)) {
600    if (!RD->isDependentType()) {
601      llvm::DIType Ty =
602        getOrCreateLimitedType(CGM.getContext().getTypeDeclType(RD),
603                               getOrCreateMainFile());
604      return llvm::DIDescriptor(Ty);
605    }
606  }
607  return TheCU;
608}
609
610/// CreatePointeeType - Create Pointee type. If Pointee is a record
611/// then emit record's fwd if debug info size reduction is enabled.
612llvm::DIType CGDebugInfo::CreatePointeeType(QualType PointeeTy,
613                                            llvm::DIFile Unit) {
614  if (DebugKind > CodeGenOptions::LimitedDebugInfo)
615    return getOrCreateType(PointeeTy, Unit);
616
617  // Limit debug info for the pointee type.
618
619  // If we have an existing type, use that, it's still smaller than creating
620  // a new type.
621  llvm::DIType Ty = getTypeOrNull(PointeeTy);
622  if (Ty.Verify()) return Ty;
623
624  // Handle qualifiers.
625  if (PointeeTy.hasLocalQualifiers())
626    return CreateQualifiedType(PointeeTy, Unit);
627
628  if (const RecordType *RTy = dyn_cast<RecordType>(PointeeTy)) {
629    RecordDecl *RD = RTy->getDecl();
630    llvm::DIDescriptor FDContext =
631      getContextDescriptor(cast<Decl>(RD->getDeclContext()));
632    llvm::DIType RetTy = createRecordFwdDecl(RD, FDContext);
633    TypeCache[QualType(RTy, 0).getAsOpaquePtr()] = RetTy;
634    return RetTy;
635  }
636  return getOrCreateType(PointeeTy, Unit);
637}
638
639llvm::DIType CGDebugInfo::CreatePointerLikeType(unsigned Tag,
640                                                const Type *Ty,
641                                                QualType PointeeTy,
642                                                llvm::DIFile Unit) {
643  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
644      Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
645    return DBuilder.createReferenceType(Tag,
646                                        CreatePointeeType(PointeeTy, Unit));
647
648  // Bit size, align and offset of the type.
649  // Size is always the size of a pointer. We can't use getTypeSize here
650  // because that does not return the correct value for references.
651  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
652  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
653  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
654
655  return DBuilder.createPointerType(CreatePointeeType(PointeeTy, Unit),
656                                    Size, Align);
657}
658
659llvm::DIType CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
660                                                   llvm::DIType &Cache) {
661  if (Cache.Verify())
662    return Cache;
663  Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
664                                     TheCU, getOrCreateMainFile(), 0);
665  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
666  Cache = DBuilder.createPointerType(Cache, Size);
667  return Cache;
668}
669
670llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
671                                     llvm::DIFile Unit) {
672  if (BlockLiteralGenericSet)
673    return BlockLiteralGeneric;
674
675  SmallVector<llvm::Value *, 8> EltTys;
676  llvm::DIType FieldTy;
677  QualType FType;
678  uint64_t FieldSize, FieldOffset;
679  unsigned FieldAlign;
680  llvm::DIArray Elements;
681  llvm::DIType EltTy, DescTy;
682
683  FieldOffset = 0;
684  FType = CGM.getContext().UnsignedLongTy;
685  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
686  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
687
688  Elements = DBuilder.getOrCreateArray(EltTys);
689  EltTys.clear();
690
691  unsigned Flags = llvm::DIDescriptor::FlagAppleBlock;
692  unsigned LineNo = getLineNumber(CurLoc);
693
694  EltTy = DBuilder.createStructType(Unit, "__block_descriptor",
695                                    Unit, LineNo, FieldOffset, 0,
696                                    Flags, llvm::DIType(), Elements);
697
698  // Bit size, align and offset of the type.
699  uint64_t Size = CGM.getContext().getTypeSize(Ty);
700
701  DescTy = DBuilder.createPointerType(EltTy, Size);
702
703  FieldOffset = 0;
704  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
705  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
706  FType = CGM.getContext().IntTy;
707  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
708  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
709  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
710  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
711
712  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
713  FieldTy = DescTy;
714  FieldSize = CGM.getContext().getTypeSize(Ty);
715  FieldAlign = CGM.getContext().getTypeAlign(Ty);
716  FieldTy = DBuilder.createMemberType(Unit, "__descriptor", Unit,
717                                      LineNo, FieldSize, FieldAlign,
718                                      FieldOffset, 0, FieldTy);
719  EltTys.push_back(FieldTy);
720
721  FieldOffset += FieldSize;
722  Elements = DBuilder.getOrCreateArray(EltTys);
723
724  EltTy = DBuilder.createStructType(Unit, "__block_literal_generic",
725                                    Unit, LineNo, FieldOffset, 0,
726                                    Flags, llvm::DIType(), Elements);
727
728  BlockLiteralGenericSet = true;
729  BlockLiteralGeneric = DBuilder.createPointerType(EltTy, Size);
730  return BlockLiteralGeneric;
731}
732
733llvm::DIType CGDebugInfo::CreateType(const TypedefType *Ty, llvm::DIFile Unit) {
734  // Typedefs are derived from some other type.  If we have a typedef of a
735  // typedef, make sure to emit the whole chain.
736  llvm::DIType Src = CreatePointeeType(Ty->getDecl()->getUnderlyingType(), Unit);
737  if (!Src.Verify())
738    return llvm::DIType();
739  // We don't set size information, but do specify where the typedef was
740  // declared.
741  unsigned Line = getLineNumber(Ty->getDecl()->getLocation());
742  const TypedefNameDecl *TyDecl = Ty->getDecl();
743
744  llvm::DIDescriptor TypedefContext =
745    getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext()));
746
747  return
748    DBuilder.createTypedef(Src, TyDecl->getName(), Unit, Line, TypedefContext);
749}
750
751llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
752                                     llvm::DIFile Unit) {
753  SmallVector<llvm::Value *, 16> EltTys;
754
755  // Add the result type at least.
756  EltTys.push_back(getOrCreateType(Ty->getResultType(), Unit));
757
758  // Set up remainder of arguments if there is a prototype.
759  // FIXME: IF NOT, HOW IS THIS REPRESENTED?  llvm-gcc doesn't represent '...'!
760  if (isa<FunctionNoProtoType>(Ty))
761    EltTys.push_back(DBuilder.createUnspecifiedParameter());
762  else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
763    for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
764      EltTys.push_back(getOrCreateType(FPT->getArgType(i), Unit));
765  }
766
767  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
768  return DBuilder.createSubroutineType(Unit, EltTypeArray);
769}
770
771
772llvm::DIType CGDebugInfo::createFieldType(StringRef name,
773                                          QualType type,
774                                          uint64_t sizeInBitsOverride,
775                                          SourceLocation loc,
776                                          AccessSpecifier AS,
777                                          uint64_t offsetInBits,
778                                          llvm::DIFile tunit,
779                                          llvm::DIDescriptor scope) {
780  llvm::DIType debugType = getOrCreateType(type, tunit);
781
782  // Get the location for the field.
783  llvm::DIFile file = getOrCreateFile(loc);
784  unsigned line = getLineNumber(loc);
785
786  uint64_t sizeInBits = 0;
787  unsigned alignInBits = 0;
788  if (!type->isIncompleteArrayType()) {
789    llvm::tie(sizeInBits, alignInBits) = CGM.getContext().getTypeInfo(type);
790
791    if (sizeInBitsOverride)
792      sizeInBits = sizeInBitsOverride;
793  }
794
795  unsigned flags = 0;
796  if (AS == clang::AS_private)
797    flags |= llvm::DIDescriptor::FlagPrivate;
798  else if (AS == clang::AS_protected)
799    flags |= llvm::DIDescriptor::FlagProtected;
800
801  return DBuilder.createMemberType(scope, name, file, line, sizeInBits,
802                                   alignInBits, offsetInBits, flags, debugType);
803}
804
805/// CollectRecordLambdaFields - Helper for CollectRecordFields.
806void CGDebugInfo::
807CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
808                          SmallVectorImpl<llvm::Value *> &elements,
809                          llvm::DIType RecordTy) {
810  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
811  // has the name and the location of the variable so we should iterate over
812  // both concurrently.
813  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
814  RecordDecl::field_iterator Field = CXXDecl->field_begin();
815  unsigned fieldno = 0;
816  for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
817         E = CXXDecl->captures_end(); I != E; ++I, ++Field, ++fieldno) {
818    const LambdaExpr::Capture C = *I;
819    if (C.capturesVariable()) {
820      VarDecl *V = C.getCapturedVar();
821      llvm::DIFile VUnit = getOrCreateFile(C.getLocation());
822      StringRef VName = V->getName();
823      uint64_t SizeInBitsOverride = 0;
824      if (Field->isBitField()) {
825        SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
826        assert(SizeInBitsOverride && "found named 0-width bitfield");
827      }
828      llvm::DIType fieldType
829        = createFieldType(VName, Field->getType(), SizeInBitsOverride,
830                          C.getLocation(), Field->getAccess(),
831                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
832      elements.push_back(fieldType);
833    } else {
834      // TODO: Need to handle 'this' in some way by probably renaming the
835      // this of the lambda class and having a field member of 'this' or
836      // by using AT_object_pointer for the function and having that be
837      // used as 'this' for semantic references.
838      assert(C.capturesThis() && "Field that isn't captured and isn't this?");
839      FieldDecl *f = *Field;
840      llvm::DIFile VUnit = getOrCreateFile(f->getLocation());
841      QualType type = f->getType();
842      llvm::DIType fieldType
843        = createFieldType("this", type, 0, f->getLocation(), f->getAccess(),
844                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
845
846      elements.push_back(fieldType);
847    }
848  }
849}
850
851/// CollectRecordStaticField - Helper for CollectRecordFields.
852void CGDebugInfo::
853CollectRecordStaticField(const VarDecl *Var,
854                         SmallVectorImpl<llvm::Value *> &elements,
855                         llvm::DIType RecordTy) {
856  // Create the descriptor for the static variable, with or without
857  // constant initializers.
858  llvm::DIFile VUnit = getOrCreateFile(Var->getLocation());
859  llvm::DIType VTy = getOrCreateType(Var->getType(), VUnit);
860
861  // Do not describe enums as static members.
862  if (VTy.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
863    return;
864
865  unsigned LineNumber = getLineNumber(Var->getLocation());
866  StringRef VName = Var->getName();
867  llvm::Constant *C = NULL;
868  if (Var->getInit()) {
869    const APValue *Value = Var->evaluateValue();
870    if (Value) {
871      if (Value->isInt())
872        C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
873      if (Value->isFloat())
874        C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
875    }
876  }
877
878  unsigned Flags = 0;
879  AccessSpecifier Access = Var->getAccess();
880  if (Access == clang::AS_private)
881    Flags |= llvm::DIDescriptor::FlagPrivate;
882  else if (Access == clang::AS_protected)
883    Flags |= llvm::DIDescriptor::FlagProtected;
884
885  llvm::DIType GV = DBuilder.createStaticMemberType(RecordTy, VName, VUnit,
886                                                    LineNumber, VTy, Flags, C);
887  elements.push_back(GV);
888  StaticDataMemberCache[Var->getCanonicalDecl()] = llvm::WeakVH(GV);
889}
890
891/// CollectRecordNormalField - Helper for CollectRecordFields.
892void CGDebugInfo::
893CollectRecordNormalField(const FieldDecl *field, uint64_t OffsetInBits,
894                         llvm::DIFile tunit,
895                         SmallVectorImpl<llvm::Value *> &elements,
896                         llvm::DIType RecordTy) {
897  StringRef name = field->getName();
898  QualType type = field->getType();
899
900  // Ignore unnamed fields unless they're anonymous structs/unions.
901  if (name.empty() && !type->isRecordType())
902    return;
903
904  uint64_t SizeInBitsOverride = 0;
905  if (field->isBitField()) {
906    SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
907    assert(SizeInBitsOverride && "found named 0-width bitfield");
908  }
909
910  llvm::DIType fieldType
911    = createFieldType(name, type, SizeInBitsOverride,
912                      field->getLocation(), field->getAccess(),
913                      OffsetInBits, tunit, RecordTy);
914
915  elements.push_back(fieldType);
916}
917
918/// CollectRecordFields - A helper function to collect debug info for
919/// record fields. This is used while creating debug info entry for a Record.
920void CGDebugInfo::
921CollectRecordFields(const RecordDecl *record, llvm::DIFile tunit,
922                    SmallVectorImpl<llvm::Value *> &elements,
923                    llvm::DIType RecordTy) {
924  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
925
926  if (CXXDecl && CXXDecl->isLambda())
927    CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
928  else {
929    const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
930
931    // Field number for non-static fields.
932    unsigned fieldNo = 0;
933
934    // Bookkeeping for an ms struct, which ignores certain fields.
935    bool IsMsStruct = record->isMsStruct(CGM.getContext());
936    const FieldDecl *LastFD = 0;
937
938    // Static and non-static members should appear in the same order as
939    // the corresponding declarations in the source program.
940    for (RecordDecl::decl_iterator I = record->decls_begin(),
941           E = record->decls_end(); I != E; ++I)
942      if (const VarDecl *V = dyn_cast<VarDecl>(*I))
943        CollectRecordStaticField(V, elements, RecordTy);
944      else if (FieldDecl *field = dyn_cast<FieldDecl>(*I)) {
945        if (IsMsStruct) {
946          // Zero-length bitfields following non-bitfield members are
947          // completely ignored; we don't even count them.
948          if (CGM.getContext().ZeroBitfieldFollowsNonBitfield((field), LastFD))
949            continue;
950          LastFD = field;
951        }
952        CollectRecordNormalField(field, layout.getFieldOffset(fieldNo),
953                                 tunit, elements, RecordTy);
954
955        // Bump field number for next field.
956        ++fieldNo;
957      }
958  }
959}
960
961/// getOrCreateMethodType - CXXMethodDecl's type is a FunctionType. This
962/// function type is not updated to include implicit "this" pointer. Use this
963/// routine to get a method type which includes "this" pointer.
964llvm::DICompositeType
965CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
966                                   llvm::DIFile Unit) {
967  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
968  if (Method->isStatic())
969    return llvm::DICompositeType(getOrCreateType(QualType(Func, 0), Unit));
970  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
971                                       Func, Unit);
972}
973
974llvm::DICompositeType CGDebugInfo::getOrCreateInstanceMethodType(
975    QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit) {
976  // Add "this" pointer.
977  llvm::DIArray Args = llvm::DICompositeType(
978      getOrCreateType(QualType(Func, 0), Unit)).getTypeArray();
979  assert (Args.getNumElements() && "Invalid number of arguments!");
980
981  SmallVector<llvm::Value *, 16> Elts;
982
983  // First element is always return type. For 'void' functions it is NULL.
984  Elts.push_back(Args.getElement(0));
985
986  // "this" pointer is always first argument.
987  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
988  if (isa<ClassTemplateSpecializationDecl>(RD)) {
989    // Create pointer type directly in this case.
990    const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
991    QualType PointeeTy = ThisPtrTy->getPointeeType();
992    unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
993    uint64_t Size = CGM.getTarget().getPointerWidth(AS);
994    uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
995    llvm::DIType PointeeType = getOrCreateType(PointeeTy, Unit);
996    llvm::DIType ThisPtrType =
997      DBuilder.createPointerType(PointeeType, Size, Align);
998    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
999    // TODO: This and the artificial type below are misleading, the
1000    // types aren't artificial the argument is, but the current
1001    // metadata doesn't represent that.
1002    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1003    Elts.push_back(ThisPtrType);
1004  } else {
1005    llvm::DIType ThisPtrType = getOrCreateType(ThisPtr, Unit);
1006    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
1007    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1008    Elts.push_back(ThisPtrType);
1009  }
1010
1011  // Copy rest of the arguments.
1012  for (unsigned i = 1, e = Args.getNumElements(); i != e; ++i)
1013    Elts.push_back(Args.getElement(i));
1014
1015  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
1016
1017  return DBuilder.createSubroutineType(Unit, EltTypeArray);
1018}
1019
1020/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1021/// inside a function.
1022static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1023  if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1024    return isFunctionLocalClass(NRD);
1025  if (isa<FunctionDecl>(RD->getDeclContext()))
1026    return true;
1027  return false;
1028}
1029
1030/// CreateCXXMemberFunction - A helper function to create a DISubprogram for
1031/// a single member function GlobalDecl.
1032llvm::DISubprogram
1033CGDebugInfo::CreateCXXMemberFunction(const CXXMethodDecl *Method,
1034                                     llvm::DIFile Unit,
1035                                     llvm::DIType RecordTy) {
1036  bool IsCtorOrDtor =
1037    isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1038
1039  StringRef MethodName = getFunctionName(Method);
1040  llvm::DICompositeType MethodTy = getOrCreateMethodType(Method, Unit);
1041
1042  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1043  // make sense to give a single ctor/dtor a linkage name.
1044  StringRef MethodLinkageName;
1045  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1046    MethodLinkageName = CGM.getMangledName(Method);
1047
1048  // Get the location for the method.
1049  llvm::DIFile MethodDefUnit = getOrCreateFile(Method->getLocation());
1050  unsigned MethodLine = getLineNumber(Method->getLocation());
1051
1052  // Collect virtual method info.
1053  llvm::DIType ContainingType;
1054  unsigned Virtuality = 0;
1055  unsigned VIndex = 0;
1056
1057  if (Method->isVirtual()) {
1058    if (Method->isPure())
1059      Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1060    else
1061      Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1062
1063    // It doesn't make sense to give a virtual destructor a vtable index,
1064    // since a single destructor has two entries in the vtable.
1065    if (!isa<CXXDestructorDecl>(Method))
1066      VIndex = CGM.getVTableContext().getMethodVTableIndex(Method);
1067    ContainingType = RecordTy;
1068  }
1069
1070  unsigned Flags = 0;
1071  if (Method->isImplicit())
1072    Flags |= llvm::DIDescriptor::FlagArtificial;
1073  AccessSpecifier Access = Method->getAccess();
1074  if (Access == clang::AS_private)
1075    Flags |= llvm::DIDescriptor::FlagPrivate;
1076  else if (Access == clang::AS_protected)
1077    Flags |= llvm::DIDescriptor::FlagProtected;
1078  if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1079    if (CXXC->isExplicit())
1080      Flags |= llvm::DIDescriptor::FlagExplicit;
1081  } else if (const CXXConversionDecl *CXXC =
1082             dyn_cast<CXXConversionDecl>(Method)) {
1083    if (CXXC->isExplicit())
1084      Flags |= llvm::DIDescriptor::FlagExplicit;
1085  }
1086  if (Method->hasPrototype())
1087    Flags |= llvm::DIDescriptor::FlagPrototyped;
1088
1089  llvm::DIArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1090  llvm::DISubprogram SP =
1091    DBuilder.createMethod(RecordTy, MethodName, MethodLinkageName,
1092                          MethodDefUnit, MethodLine,
1093                          MethodTy, /*isLocalToUnit=*/false,
1094                          /* isDefinition=*/ false,
1095                          Virtuality, VIndex, ContainingType,
1096                          Flags, CGM.getLangOpts().Optimize, NULL,
1097                          TParamsArray);
1098
1099  SPCache[Method->getCanonicalDecl()] = llvm::WeakVH(SP);
1100
1101  return SP;
1102}
1103
1104/// CollectCXXMemberFunctions - A helper function to collect debug info for
1105/// C++ member functions. This is used while creating debug info entry for
1106/// a Record.
1107void CGDebugInfo::
1108CollectCXXMemberFunctions(const CXXRecordDecl *RD, llvm::DIFile Unit,
1109                          SmallVectorImpl<llvm::Value *> &EltTys,
1110                          llvm::DIType RecordTy) {
1111
1112  // Since we want more than just the individual member decls if we
1113  // have templated functions iterate over every declaration to gather
1114  // the functions.
1115  for(DeclContext::decl_iterator I = RD->decls_begin(),
1116        E = RD->decls_end(); I != E; ++I) {
1117    Decl *D = *I;
1118    if (D->isImplicit() && !D->isUsed())
1119      continue;
1120
1121    if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1122      EltTys.push_back(CreateCXXMemberFunction(Method, Unit, RecordTy));
1123    else if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
1124      for (FunctionTemplateDecl::spec_iterator SI = FTD->spec_begin(),
1125             SE = FTD->spec_end(); SI != SE; ++SI)
1126        EltTys.push_back(CreateCXXMemberFunction(cast<CXXMethodDecl>(*SI), Unit,
1127                                                 RecordTy));
1128  }
1129}
1130
1131/// CollectCXXFriends - A helper function to collect debug info for
1132/// C++ base classes. This is used while creating debug info entry for
1133/// a Record.
1134void CGDebugInfo::
1135CollectCXXFriends(const CXXRecordDecl *RD, llvm::DIFile Unit,
1136                SmallVectorImpl<llvm::Value *> &EltTys,
1137                llvm::DIType RecordTy) {
1138  for (CXXRecordDecl::friend_iterator BI = RD->friend_begin(),
1139         BE = RD->friend_end(); BI != BE; ++BI) {
1140    if ((*BI)->isUnsupportedFriend())
1141      continue;
1142    if (TypeSourceInfo *TInfo = (*BI)->getFriendType())
1143      EltTys.push_back(DBuilder.createFriend(RecordTy,
1144                                             getOrCreateType(TInfo->getType(),
1145                                                             Unit)));
1146  }
1147}
1148
1149/// CollectCXXBases - A helper function to collect debug info for
1150/// C++ base classes. This is used while creating debug info entry for
1151/// a Record.
1152void CGDebugInfo::
1153CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile Unit,
1154                SmallVectorImpl<llvm::Value *> &EltTys,
1155                llvm::DIType RecordTy) {
1156
1157  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1158  for (CXXRecordDecl::base_class_const_iterator BI = RD->bases_begin(),
1159         BE = RD->bases_end(); BI != BE; ++BI) {
1160    unsigned BFlags = 0;
1161    uint64_t BaseOffset;
1162
1163    const CXXRecordDecl *Base =
1164      cast<CXXRecordDecl>(BI->getType()->getAs<RecordType>()->getDecl());
1165
1166    if (BI->isVirtual()) {
1167      // virtual base offset offset is -ve. The code generator emits dwarf
1168      // expression where it expects +ve number.
1169      BaseOffset =
1170        0 - CGM.getVTableContext()
1171               .getVirtualBaseOffsetOffset(RD, Base).getQuantity();
1172      BFlags = llvm::DIDescriptor::FlagVirtual;
1173    } else
1174      BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1175    // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1176    // BI->isVirtual() and bits when not.
1177
1178    AccessSpecifier Access = BI->getAccessSpecifier();
1179    if (Access == clang::AS_private)
1180      BFlags |= llvm::DIDescriptor::FlagPrivate;
1181    else if (Access == clang::AS_protected)
1182      BFlags |= llvm::DIDescriptor::FlagProtected;
1183
1184    llvm::DIType DTy =
1185      DBuilder.createInheritance(RecordTy,
1186                                 getOrCreateType(BI->getType(), Unit),
1187                                 BaseOffset, BFlags);
1188    EltTys.push_back(DTy);
1189  }
1190}
1191
1192/// CollectTemplateParams - A helper function to collect template parameters.
1193llvm::DIArray CGDebugInfo::
1194CollectTemplateParams(const TemplateParameterList *TPList,
1195                      const TemplateArgumentList &TAList,
1196                      llvm::DIFile Unit) {
1197  SmallVector<llvm::Value *, 16> TemplateParams;
1198  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1199    const TemplateArgument &TA = TAList[i];
1200    const NamedDecl *ND = TPList->getParam(i);
1201    switch (TA.getKind()) {
1202    case TemplateArgument::Type: {
1203      llvm::DIType TTy = getOrCreateType(TA.getAsType(), Unit);
1204      llvm::DITemplateTypeParameter TTP =
1205        DBuilder.createTemplateTypeParameter(TheCU, ND->getName(), TTy);
1206      TemplateParams.push_back(TTP);
1207    } break;
1208    case TemplateArgument::Integral: {
1209      llvm::DIType TTy = getOrCreateType(TA.getIntegralType(), Unit);
1210      llvm::DITemplateValueParameter TVP =
1211          DBuilder.createTemplateValueParameter(
1212              TheCU, ND->getName(), TTy,
1213              llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral()));
1214      TemplateParams.push_back(TVP);
1215    } break;
1216    case TemplateArgument::Declaration: {
1217      const ValueDecl *D = TA.getAsDecl();
1218      bool InstanceMember = D->isCXXInstanceMember();
1219      QualType T = InstanceMember
1220                       ? CGM.getContext().getMemberPointerType(
1221                             D->getType(), cast<RecordDecl>(D->getDeclContext())
1222                                               ->getTypeForDecl())
1223                       : CGM.getContext().getPointerType(D->getType());
1224      llvm::DIType TTy = getOrCreateType(T, Unit);
1225      llvm::Value *V = 0;
1226      // Variable pointer template parameters have a value that is the address
1227      // of the variable.
1228      if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1229        V = CGM.GetAddrOfGlobalVar(VD);
1230      // Member function pointers have special support for building them, though
1231      // this is currently unsupported in LLVM CodeGen.
1232      if (InstanceMember) {
1233        if (const CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(D))
1234          V = CGM.getCXXABI().EmitMemberPointer(method);
1235      } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
1236        V = CGM.GetAddrOfFunction(FD);
1237      // Member data pointers have special handling too to compute the fixed
1238      // offset within the object.
1239      if (isa<FieldDecl>(D)) {
1240        // These five lines (& possibly the above member function pointer
1241        // handling) might be able to be refactored to use similar code in
1242        // CodeGenModule::getMemberPointerConstant
1243        uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1244        CharUnits chars =
1245            CGM.getContext().toCharUnitsFromBits((int64_t) fieldOffset);
1246        V = CGM.getCXXABI().EmitMemberDataPointer(
1247            cast<MemberPointerType>(T.getTypePtr()), chars);
1248      }
1249      llvm::DITemplateValueParameter TVP =
1250          DBuilder.createTemplateValueParameter(TheCU, ND->getName(), TTy, V);
1251      TemplateParams.push_back(TVP);
1252    } break;
1253    case TemplateArgument::NullPtr: {
1254      QualType T = TA.getNullPtrType();
1255      llvm::DIType TTy = getOrCreateType(T, Unit);
1256      llvm::Value *V = 0;
1257      // Special case member data pointer null values since they're actually -1
1258      // instead of zero.
1259      if (const MemberPointerType *MPT =
1260              dyn_cast<MemberPointerType>(T.getTypePtr()))
1261        // But treat member function pointers as simple zero integers because
1262        // it's easier than having a special case in LLVM's CodeGen. If LLVM
1263        // CodeGen grows handling for values of non-null member function
1264        // pointers then perhaps we could remove this special case and rely on
1265        // EmitNullMemberPointer for member function pointers.
1266        if (MPT->isMemberDataPointer())
1267          V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1268      if (!V)
1269        V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1270      llvm::DITemplateValueParameter TVP =
1271          DBuilder.createTemplateValueParameter(TheCU, ND->getName(), TTy, V);
1272      TemplateParams.push_back(TVP);
1273    } break;
1274    case TemplateArgument::Template:
1275      // We could support this with the GCC extension
1276      // DW_TAG_GNU_template_template_param
1277      break;
1278    case TemplateArgument::Pack:
1279      // And this with DW_TAG_GNU_template_parameter_pack
1280      break;
1281    // And the following should never occur:
1282    case TemplateArgument::Expression:
1283    case TemplateArgument::TemplateExpansion:
1284    case TemplateArgument::Null:
1285      llvm_unreachable(
1286          "These argument types shouldn't exist in concrete types");
1287    }
1288  }
1289  return DBuilder.getOrCreateArray(TemplateParams);
1290}
1291
1292/// CollectFunctionTemplateParams - A helper function to collect debug
1293/// info for function template parameters.
1294llvm::DIArray CGDebugInfo::
1295CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit) {
1296  if (FD->getTemplatedKind() ==
1297      FunctionDecl::TK_FunctionTemplateSpecialization) {
1298    const TemplateParameterList *TList =
1299      FD->getTemplateSpecializationInfo()->getTemplate()
1300      ->getTemplateParameters();
1301    return
1302      CollectTemplateParams(TList, *FD->getTemplateSpecializationArgs(), Unit);
1303  }
1304  return llvm::DIArray();
1305}
1306
1307/// CollectCXXTemplateParams - A helper function to collect debug info for
1308/// template parameters.
1309llvm::DIArray CGDebugInfo::
1310CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TSpecial,
1311                         llvm::DIFile Unit) {
1312  llvm::PointerUnion<ClassTemplateDecl *,
1313                     ClassTemplatePartialSpecializationDecl *>
1314    PU = TSpecial->getSpecializedTemplateOrPartial();
1315
1316  TemplateParameterList *TPList = PU.is<ClassTemplateDecl *>() ?
1317    PU.get<ClassTemplateDecl *>()->getTemplateParameters() :
1318    PU.get<ClassTemplatePartialSpecializationDecl *>()->getTemplateParameters();
1319  const TemplateArgumentList &TAList = TSpecial->getTemplateInstantiationArgs();
1320  return CollectTemplateParams(TPList, TAList, Unit);
1321}
1322
1323/// getOrCreateVTablePtrType - Return debug info descriptor for vtable.
1324llvm::DIType CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile Unit) {
1325  if (VTablePtrType.isValid())
1326    return VTablePtrType;
1327
1328  ASTContext &Context = CGM.getContext();
1329
1330  /* Function type */
1331  llvm::Value *STy = getOrCreateType(Context.IntTy, Unit);
1332  llvm::DIArray SElements = DBuilder.getOrCreateArray(STy);
1333  llvm::DIType SubTy = DBuilder.createSubroutineType(Unit, SElements);
1334  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1335  llvm::DIType vtbl_ptr_type = DBuilder.createPointerType(SubTy, Size, 0,
1336                                                          "__vtbl_ptr_type");
1337  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1338  return VTablePtrType;
1339}
1340
1341/// getVTableName - Get vtable name for the given Class.
1342StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1343  // Construct gdb compatible name name.
1344  std::string Name = "_vptr$" + RD->getNameAsString();
1345
1346  // Copy this name on the side and use its reference.
1347  char *StrPtr = DebugInfoNames.Allocate<char>(Name.length());
1348  memcpy(StrPtr, Name.data(), Name.length());
1349  return StringRef(StrPtr, Name.length());
1350}
1351
1352
1353/// CollectVTableInfo - If the C++ class has vtable info then insert appropriate
1354/// debug info entry in EltTys vector.
1355void CGDebugInfo::
1356CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile Unit,
1357                  SmallVectorImpl<llvm::Value *> &EltTys) {
1358  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1359
1360  // If there is a primary base then it will hold vtable info.
1361  if (RL.getPrimaryBase())
1362    return;
1363
1364  // If this class is not dynamic then there is not any vtable info to collect.
1365  if (!RD->isDynamicClass())
1366    return;
1367
1368  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1369  llvm::DIType VPTR
1370    = DBuilder.createMemberType(Unit, getVTableName(RD), Unit,
1371                                0, Size, 0, 0,
1372                                llvm::DIDescriptor::FlagArtificial,
1373                                getOrCreateVTablePtrType(Unit));
1374  EltTys.push_back(VPTR);
1375}
1376
1377/// getOrCreateRecordType - Emit record type's standalone debug info.
1378llvm::DIType CGDebugInfo::getOrCreateRecordType(QualType RTy,
1379                                                SourceLocation Loc) {
1380  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1381  llvm::DIType T = getOrCreateType(RTy, getOrCreateFile(Loc));
1382  return T;
1383}
1384
1385/// getOrCreateInterfaceType - Emit an objective c interface type standalone
1386/// debug info.
1387llvm::DIType CGDebugInfo::getOrCreateInterfaceType(QualType D,
1388                                                   SourceLocation Loc) {
1389  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1390  llvm::DIType T = getOrCreateType(D, getOrCreateFile(Loc));
1391  RetainedTypes.push_back(D.getAsOpaquePtr());
1392  return T;
1393}
1394
1395/// CreateType - get structure or union type.
1396llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty) {
1397  RecordDecl *RD = Ty->getDecl();
1398
1399  // Get overall information about the record type for the debug info.
1400  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
1401
1402  // Records and classes and unions can all be recursive.  To handle them, we
1403  // first generate a debug descriptor for the struct as a forward declaration.
1404  // Then (if it is a definition) we go through and get debug info for all of
1405  // its members.  Finally, we create a descriptor for the complete type (which
1406  // may refer to the forward decl if the struct is recursive) and replace all
1407  // uses of the forward declaration with the final definition.
1408
1409  llvm::DICompositeType FwdDecl(
1410      getOrCreateLimitedType(QualType(Ty, 0), DefUnit));
1411  assert(FwdDecl.Verify() &&
1412         "The debug type of a RecordType should be a llvm::DICompositeType");
1413
1414  if (FwdDecl.isForwardDecl())
1415    return FwdDecl;
1416
1417  // Push the struct on region stack.
1418  LexicalBlockStack.push_back(&*FwdDecl);
1419  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
1420
1421  // Add this to the completed-type cache while we're completing it recursively.
1422  CompletedTypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
1423
1424  // Convert all the elements.
1425  SmallVector<llvm::Value *, 16> EltTys;
1426
1427  // Note: The split of CXXDecl information here is intentional, the
1428  // gdb tests will depend on a certain ordering at printout. The debug
1429  // information offsets are still correct if we merge them all together
1430  // though.
1431  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1432  if (CXXDecl) {
1433    CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
1434    CollectVTableInfo(CXXDecl, DefUnit, EltTys);
1435  }
1436
1437  // Collect data fields (including static variables and any initializers).
1438  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
1439  llvm::DIArray TParamsArray;
1440  if (CXXDecl) {
1441    CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
1442    CollectCXXFriends(CXXDecl, DefUnit, EltTys, FwdDecl);
1443    if (const ClassTemplateSpecializationDecl *TSpecial
1444        = dyn_cast<ClassTemplateSpecializationDecl>(RD))
1445      TParamsArray = CollectCXXTemplateParams(TSpecial, DefUnit);
1446  }
1447
1448  LexicalBlockStack.pop_back();
1449  RegionMap.erase(Ty->getDecl());
1450
1451  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1452  FwdDecl.setTypeArray(Elements, TParamsArray);
1453
1454  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
1455  return FwdDecl;
1456}
1457
1458/// CreateType - get objective-c object type.
1459llvm::DIType CGDebugInfo::CreateType(const ObjCObjectType *Ty,
1460                                     llvm::DIFile Unit) {
1461  // Ignore protocols.
1462  return getOrCreateType(Ty->getBaseType(), Unit);
1463}
1464
1465/// CreateType - get objective-c interface type.
1466llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
1467                                     llvm::DIFile Unit) {
1468  ObjCInterfaceDecl *ID = Ty->getDecl();
1469  if (!ID)
1470    return llvm::DIType();
1471
1472  // Get overall information about the record type for the debug info.
1473  llvm::DIFile DefUnit = getOrCreateFile(ID->getLocation());
1474  unsigned Line = getLineNumber(ID->getLocation());
1475  unsigned RuntimeLang = TheCU.getLanguage();
1476
1477  // If this is just a forward declaration return a special forward-declaration
1478  // debug type since we won't be able to lay out the entire type.
1479  ObjCInterfaceDecl *Def = ID->getDefinition();
1480  if (!Def) {
1481    llvm::DIType FwdDecl =
1482      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
1483                                 ID->getName(), TheCU, DefUnit, Line,
1484                                 RuntimeLang);
1485    return FwdDecl;
1486  }
1487
1488  ID = Def;
1489
1490  // Bit size, align and offset of the type.
1491  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1492  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1493
1494  unsigned Flags = 0;
1495  if (ID->getImplementation())
1496    Flags |= llvm::DIDescriptor::FlagObjcClassComplete;
1497
1498  llvm::DICompositeType RealDecl =
1499    DBuilder.createStructType(Unit, ID->getName(), DefUnit,
1500                              Line, Size, Align, Flags,
1501                              llvm::DIType(), llvm::DIArray(), RuntimeLang);
1502
1503  // Otherwise, insert it into the CompletedTypeCache so that recursive uses
1504  // will find it and we're emitting the complete type.
1505  QualType QualTy = QualType(Ty, 0);
1506  CompletedTypeCache[QualTy.getAsOpaquePtr()] = RealDecl;
1507  // Push the struct on region stack.
1508
1509  LexicalBlockStack.push_back(static_cast<llvm::MDNode*>(RealDecl));
1510  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
1511
1512  // Convert all the elements.
1513  SmallVector<llvm::Value *, 16> EltTys;
1514
1515  ObjCInterfaceDecl *SClass = ID->getSuperClass();
1516  if (SClass) {
1517    llvm::DIType SClassTy =
1518      getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
1519    if (!SClassTy.isValid())
1520      return llvm::DIType();
1521
1522    llvm::DIType InhTag =
1523      DBuilder.createInheritance(RealDecl, SClassTy, 0, 0);
1524    EltTys.push_back(InhTag);
1525  }
1526
1527  for (ObjCContainerDecl::prop_iterator I = ID->prop_begin(),
1528         E = ID->prop_end(); I != E; ++I) {
1529    const ObjCPropertyDecl *PD = *I;
1530    SourceLocation Loc = PD->getLocation();
1531    llvm::DIFile PUnit = getOrCreateFile(Loc);
1532    unsigned PLine = getLineNumber(Loc);
1533    ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1534    ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1535    llvm::MDNode *PropertyNode =
1536      DBuilder.createObjCProperty(PD->getName(),
1537                                  PUnit, PLine,
1538                                  (Getter && Getter->isImplicit()) ? "" :
1539                                  getSelectorName(PD->getGetterName()),
1540                                  (Setter && Setter->isImplicit()) ? "" :
1541                                  getSelectorName(PD->getSetterName()),
1542                                  PD->getPropertyAttributes(),
1543                                  getOrCreateType(PD->getType(), PUnit));
1544    EltTys.push_back(PropertyNode);
1545  }
1546
1547  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
1548  unsigned FieldNo = 0;
1549  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
1550       Field = Field->getNextIvar(), ++FieldNo) {
1551    llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
1552    if (!FieldTy.isValid())
1553      return llvm::DIType();
1554
1555    StringRef FieldName = Field->getName();
1556
1557    // Ignore unnamed fields.
1558    if (FieldName.empty())
1559      continue;
1560
1561    // Get the location for the field.
1562    llvm::DIFile FieldDefUnit = getOrCreateFile(Field->getLocation());
1563    unsigned FieldLine = getLineNumber(Field->getLocation());
1564    QualType FType = Field->getType();
1565    uint64_t FieldSize = 0;
1566    unsigned FieldAlign = 0;
1567
1568    if (!FType->isIncompleteArrayType()) {
1569
1570      // Bit size, align and offset of the type.
1571      FieldSize = Field->isBitField()
1572        ? Field->getBitWidthValue(CGM.getContext())
1573        : CGM.getContext().getTypeSize(FType);
1574      FieldAlign = CGM.getContext().getTypeAlign(FType);
1575    }
1576
1577    uint64_t FieldOffset;
1578    if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
1579      // We don't know the runtime offset of an ivar if we're using the
1580      // non-fragile ABI.  For bitfields, use the bit offset into the first
1581      // byte of storage of the bitfield.  For other fields, use zero.
1582      if (Field->isBitField()) {
1583        FieldOffset = CGM.getObjCRuntime().ComputeBitfieldBitOffset(
1584            CGM, ID, Field);
1585        FieldOffset %= CGM.getContext().getCharWidth();
1586      } else {
1587        FieldOffset = 0;
1588      }
1589    } else {
1590      FieldOffset = RL.getFieldOffset(FieldNo);
1591    }
1592
1593    unsigned Flags = 0;
1594    if (Field->getAccessControl() == ObjCIvarDecl::Protected)
1595      Flags = llvm::DIDescriptor::FlagProtected;
1596    else if (Field->getAccessControl() == ObjCIvarDecl::Private)
1597      Flags = llvm::DIDescriptor::FlagPrivate;
1598
1599    llvm::MDNode *PropertyNode = NULL;
1600    if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
1601      if (ObjCPropertyImplDecl *PImpD =
1602          ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
1603        if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
1604          SourceLocation Loc = PD->getLocation();
1605          llvm::DIFile PUnit = getOrCreateFile(Loc);
1606          unsigned PLine = getLineNumber(Loc);
1607          ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1608          ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1609          PropertyNode =
1610            DBuilder.createObjCProperty(PD->getName(),
1611                                        PUnit, PLine,
1612                                        (Getter && Getter->isImplicit()) ? "" :
1613                                        getSelectorName(PD->getGetterName()),
1614                                        (Setter && Setter->isImplicit()) ? "" :
1615                                        getSelectorName(PD->getSetterName()),
1616                                        PD->getPropertyAttributes(),
1617                                        getOrCreateType(PD->getType(), PUnit));
1618        }
1619      }
1620    }
1621    FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit,
1622                                      FieldLine, FieldSize, FieldAlign,
1623                                      FieldOffset, Flags, FieldTy,
1624                                      PropertyNode);
1625    EltTys.push_back(FieldTy);
1626  }
1627
1628  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1629  RealDecl.setTypeArray(Elements);
1630
1631  // If the implementation is not yet set, we do not want to mark it
1632  // as complete. An implementation may declare additional
1633  // private ivars that we would miss otherwise.
1634  if (ID->getImplementation() == 0)
1635    CompletedTypeCache.erase(QualTy.getAsOpaquePtr());
1636
1637  LexicalBlockStack.pop_back();
1638  return RealDecl;
1639}
1640
1641llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) {
1642  llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
1643  int64_t Count = Ty->getNumElements();
1644  if (Count == 0)
1645    // If number of elements are not known then this is an unbounded array.
1646    // Use Count == -1 to express such arrays.
1647    Count = -1;
1648
1649  llvm::Value *Subscript = DBuilder.getOrCreateSubrange(0, Count);
1650  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
1651
1652  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1653  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1654
1655  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
1656}
1657
1658llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
1659                                     llvm::DIFile Unit) {
1660  uint64_t Size;
1661  uint64_t Align;
1662
1663  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
1664  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
1665    Size = 0;
1666    Align =
1667      CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
1668  } else if (Ty->isIncompleteArrayType()) {
1669    Size = 0;
1670    if (Ty->getElementType()->isIncompleteType())
1671      Align = 0;
1672    else
1673      Align = CGM.getContext().getTypeAlign(Ty->getElementType());
1674  } else if (Ty->isIncompleteType()) {
1675    Size = 0;
1676    Align = 0;
1677  } else {
1678    // Size and align of the whole array, not the element type.
1679    Size = CGM.getContext().getTypeSize(Ty);
1680    Align = CGM.getContext().getTypeAlign(Ty);
1681  }
1682
1683  // Add the dimensions of the array.  FIXME: This loses CV qualifiers from
1684  // interior arrays, do we care?  Why aren't nested arrays represented the
1685  // obvious/recursive way?
1686  SmallVector<llvm::Value *, 8> Subscripts;
1687  QualType EltTy(Ty, 0);
1688  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
1689    // If the number of elements is known, then count is that number. Otherwise,
1690    // it's -1. This allows us to represent a subrange with an array of 0
1691    // elements, like this:
1692    //
1693    //   struct foo {
1694    //     int x[0];
1695    //   };
1696    int64_t Count = -1;         // Count == -1 is an unbounded array.
1697    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
1698      Count = CAT->getSize().getZExtValue();
1699
1700    // FIXME: Verify this is right for VLAs.
1701    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
1702    EltTy = Ty->getElementType();
1703  }
1704
1705  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
1706
1707  llvm::DIType DbgTy =
1708    DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
1709                             SubscriptArray);
1710  return DbgTy;
1711}
1712
1713llvm::DIType CGDebugInfo::CreateType(const LValueReferenceType *Ty,
1714                                     llvm::DIFile Unit) {
1715  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type,
1716                               Ty, Ty->getPointeeType(), Unit);
1717}
1718
1719llvm::DIType CGDebugInfo::CreateType(const RValueReferenceType *Ty,
1720                                     llvm::DIFile Unit) {
1721  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type,
1722                               Ty, Ty->getPointeeType(), Unit);
1723}
1724
1725llvm::DIType CGDebugInfo::CreateType(const MemberPointerType *Ty,
1726                                     llvm::DIFile U) {
1727  llvm::DIType ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
1728  if (!Ty->getPointeeType()->isFunctionType())
1729    return DBuilder.createMemberPointerType(
1730        CreatePointeeType(Ty->getPointeeType(), U), ClassType);
1731  return DBuilder.createMemberPointerType(getOrCreateInstanceMethodType(
1732      CGM.getContext().getPointerType(
1733          QualType(Ty->getClass(), Ty->getPointeeType().getCVRQualifiers())),
1734      Ty->getPointeeType()->getAs<FunctionProtoType>(), U),
1735                                          ClassType);
1736}
1737
1738llvm::DIType CGDebugInfo::CreateType(const AtomicType *Ty,
1739                                     llvm::DIFile U) {
1740  // Ignore the atomic wrapping
1741  // FIXME: What is the correct representation?
1742  return getOrCreateType(Ty->getValueType(), U);
1743}
1744
1745/// CreateEnumType - get enumeration type.
1746llvm::DIType CGDebugInfo::CreateEnumType(const EnumDecl *ED) {
1747  uint64_t Size = 0;
1748  uint64_t Align = 0;
1749  if (!ED->getTypeForDecl()->isIncompleteType()) {
1750    Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
1751    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
1752  }
1753
1754  // If this is just a forward declaration, construct an appropriately
1755  // marked node and just return it.
1756  if (!ED->getDefinition()) {
1757    llvm::DIDescriptor EDContext;
1758    EDContext = getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1759    llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1760    unsigned Line = getLineNumber(ED->getLocation());
1761    StringRef EDName = ED->getName();
1762    return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_enumeration_type,
1763                                      EDName, EDContext, DefUnit, Line, 0,
1764                                      Size, Align);
1765  }
1766
1767  // Create DIEnumerator elements for each enumerator.
1768  SmallVector<llvm::Value *, 16> Enumerators;
1769  ED = ED->getDefinition();
1770  for (EnumDecl::enumerator_iterator
1771         Enum = ED->enumerator_begin(), EnumEnd = ED->enumerator_end();
1772       Enum != EnumEnd; ++Enum) {
1773    Enumerators.push_back(
1774      DBuilder.createEnumerator(Enum->getName(),
1775                                Enum->getInitVal().getZExtValue()));
1776  }
1777
1778  // Return a CompositeType for the enum itself.
1779  llvm::DIArray EltArray = DBuilder.getOrCreateArray(Enumerators);
1780
1781  llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1782  unsigned Line = getLineNumber(ED->getLocation());
1783  llvm::DIDescriptor EnumContext =
1784    getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1785  llvm::DIType ClassTy = ED->isFixed() ?
1786    getOrCreateType(ED->getIntegerType(), DefUnit) : llvm::DIType();
1787  llvm::DIType DbgTy =
1788    DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit, Line,
1789                                   Size, Align, EltArray,
1790                                   ClassTy);
1791  return DbgTy;
1792}
1793
1794static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
1795  Qualifiers Quals;
1796  do {
1797    Quals += T.getLocalQualifiers();
1798    QualType LastT = T;
1799    switch (T->getTypeClass()) {
1800    default:
1801      return C.getQualifiedType(T.getTypePtr(), Quals);
1802    case Type::TemplateSpecialization:
1803      T = cast<TemplateSpecializationType>(T)->desugar();
1804      break;
1805    case Type::TypeOfExpr:
1806      T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
1807      break;
1808    case Type::TypeOf:
1809      T = cast<TypeOfType>(T)->getUnderlyingType();
1810      break;
1811    case Type::Decltype:
1812      T = cast<DecltypeType>(T)->getUnderlyingType();
1813      break;
1814    case Type::UnaryTransform:
1815      T = cast<UnaryTransformType>(T)->getUnderlyingType();
1816      break;
1817    case Type::Attributed:
1818      T = cast<AttributedType>(T)->getEquivalentType();
1819      break;
1820    case Type::Elaborated:
1821      T = cast<ElaboratedType>(T)->getNamedType();
1822      break;
1823    case Type::Paren:
1824      T = cast<ParenType>(T)->getInnerType();
1825      break;
1826    case Type::SubstTemplateTypeParm:
1827      T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
1828      break;
1829    case Type::Auto:
1830      QualType DT = cast<AutoType>(T)->getDeducedType();
1831      if (DT.isNull())
1832        return T;
1833      T = DT;
1834      break;
1835    }
1836
1837    assert(T != LastT && "Type unwrapping failed to unwrap!");
1838    (void)LastT;
1839  } while (true);
1840}
1841
1842/// getType - Get the type from the cache or return null type if it doesn't
1843/// exist.
1844llvm::DIType CGDebugInfo::getTypeOrNull(QualType Ty) {
1845
1846  // Unwrap the type as needed for debug information.
1847  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1848
1849  // Check for existing entry.
1850  if (Ty->getTypeClass() == Type::ObjCInterface) {
1851    llvm::Value *V = getCachedInterfaceTypeOrNull(Ty);
1852    if (V)
1853      return llvm::DIType(cast<llvm::MDNode>(V));
1854    else return llvm::DIType();
1855  }
1856
1857  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1858    TypeCache.find(Ty.getAsOpaquePtr());
1859  if (it != TypeCache.end()) {
1860    // Verify that the debug info still exists.
1861    if (llvm::Value *V = it->second)
1862      return llvm::DIType(cast<llvm::MDNode>(V));
1863  }
1864
1865  return llvm::DIType();
1866}
1867
1868/// getCompletedTypeOrNull - Get the type from the cache or return null if it
1869/// doesn't exist.
1870llvm::DIType CGDebugInfo::getCompletedTypeOrNull(QualType Ty) {
1871
1872  // Unwrap the type as needed for debug information.
1873  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1874
1875  // Check for existing entry.
1876  llvm::Value *V = 0;
1877  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1878    CompletedTypeCache.find(Ty.getAsOpaquePtr());
1879  if (it != CompletedTypeCache.end())
1880    V = it->second;
1881  else {
1882    V = getCachedInterfaceTypeOrNull(Ty);
1883  }
1884
1885  // Verify that any cached debug info still exists.
1886  if (V != 0)
1887    return llvm::DIType(cast<llvm::MDNode>(V));
1888
1889  return llvm::DIType();
1890}
1891
1892/// getCachedInterfaceTypeOrNull - Get the type from the interface
1893/// cache, unless it needs to regenerated. Otherwise return null.
1894llvm::Value *CGDebugInfo::getCachedInterfaceTypeOrNull(QualType Ty) {
1895  // Is there a cached interface that hasn't changed?
1896  llvm::DenseMap<void *, std::pair<llvm::WeakVH, unsigned > >
1897    ::iterator it1 = ObjCInterfaceCache.find(Ty.getAsOpaquePtr());
1898
1899  if (it1 != ObjCInterfaceCache.end())
1900    if (ObjCInterfaceDecl* Decl = getObjCInterfaceDecl(Ty))
1901      if (Checksum(Decl) == it1->second.second)
1902        // Return cached forward declaration.
1903        return it1->second.first;
1904
1905  return 0;
1906}
1907
1908/// getOrCreateType - Get the type from the cache or create a new
1909/// one if necessary.
1910llvm::DIType CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile Unit) {
1911  if (Ty.isNull())
1912    return llvm::DIType();
1913
1914  // Unwrap the type as needed for debug information.
1915  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1916
1917  llvm::DIType T = getCompletedTypeOrNull(Ty);
1918
1919  if (T.Verify())
1920    return T;
1921
1922  // Otherwise create the type.
1923  llvm::DIType Res = CreateTypeNode(Ty, Unit);
1924  void* TyPtr = Ty.getAsOpaquePtr();
1925
1926  // And update the type cache.
1927  TypeCache[TyPtr] = Res;
1928
1929  llvm::DIType TC = getTypeOrNull(Ty);
1930  if (TC.Verify() && TC.isForwardDecl())
1931    ReplaceMap.push_back(std::make_pair(TyPtr, static_cast<llvm::Value*>(TC)));
1932  else if (ObjCInterfaceDecl* Decl = getObjCInterfaceDecl(Ty)) {
1933    // Interface types may have elements added to them by a
1934    // subsequent implementation or extension, so we keep them in
1935    // the ObjCInterfaceCache together with a checksum. Instead of
1936    // the (possibly) incomplete interface type, we return a forward
1937    // declaration that gets RAUW'd in CGDebugInfo::finalize().
1938    std::pair<llvm::WeakVH, unsigned> &V = ObjCInterfaceCache[TyPtr];
1939    if (V.first)
1940      return llvm::DIType(cast<llvm::MDNode>(V.first));
1941    TC = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
1942                                    Decl->getName(), TheCU, Unit,
1943                                    getLineNumber(Decl->getLocation()),
1944                                    TheCU.getLanguage());
1945    // Store the forward declaration in the cache.
1946    V.first = TC;
1947    V.second = Checksum(Decl);
1948
1949    // Register the type for replacement in finalize().
1950    ReplaceMap.push_back(std::make_pair(TyPtr, static_cast<llvm::Value*>(TC)));
1951
1952    return TC;
1953  }
1954
1955  if (!Res.isForwardDecl())
1956    CompletedTypeCache[TyPtr] = Res;
1957
1958  return Res;
1959}
1960
1961/// Currently the checksum merely consists of the number of ivars.
1962unsigned CGDebugInfo::Checksum(const ObjCInterfaceDecl
1963                               *InterfaceDecl) {
1964  unsigned IvarNo = 0;
1965  for (const ObjCIvarDecl *Ivar = InterfaceDecl->all_declared_ivar_begin();
1966       Ivar != 0; Ivar = Ivar->getNextIvar()) ++IvarNo;
1967  return IvarNo;
1968}
1969
1970ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {
1971  switch (Ty->getTypeClass()) {
1972  case Type::ObjCObjectPointer:
1973    return getObjCInterfaceDecl(cast<ObjCObjectPointerType>(Ty)
1974                                    ->getPointeeType());
1975  case Type::ObjCInterface:
1976    return cast<ObjCInterfaceType>(Ty)->getDecl();
1977  default:
1978    return 0;
1979  }
1980}
1981
1982/// CreateTypeNode - Create a new debug type node.
1983llvm::DIType CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile Unit) {
1984  // Handle qualifiers, which recursively handles what they refer to.
1985  if (Ty.hasLocalQualifiers())
1986    return CreateQualifiedType(Ty, Unit);
1987
1988  const char *Diag = 0;
1989
1990  // Work out details of type.
1991  switch (Ty->getTypeClass()) {
1992#define TYPE(Class, Base)
1993#define ABSTRACT_TYPE(Class, Base)
1994#define NON_CANONICAL_TYPE(Class, Base)
1995#define DEPENDENT_TYPE(Class, Base) case Type::Class:
1996#include "clang/AST/TypeNodes.def"
1997    llvm_unreachable("Dependent types cannot show up in debug information");
1998
1999  case Type::ExtVector:
2000  case Type::Vector:
2001    return CreateType(cast<VectorType>(Ty), Unit);
2002  case Type::ObjCObjectPointer:
2003    return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
2004  case Type::ObjCObject:
2005    return CreateType(cast<ObjCObjectType>(Ty), Unit);
2006  case Type::ObjCInterface:
2007    return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
2008  case Type::Builtin:
2009    return CreateType(cast<BuiltinType>(Ty));
2010  case Type::Complex:
2011    return CreateType(cast<ComplexType>(Ty));
2012  case Type::Pointer:
2013    return CreateType(cast<PointerType>(Ty), Unit);
2014  case Type::BlockPointer:
2015    return CreateType(cast<BlockPointerType>(Ty), Unit);
2016  case Type::Typedef:
2017    return CreateType(cast<TypedefType>(Ty), Unit);
2018  case Type::Record:
2019    return CreateType(cast<RecordType>(Ty));
2020  case Type::Enum:
2021    return CreateEnumType(cast<EnumType>(Ty)->getDecl());
2022  case Type::FunctionProto:
2023  case Type::FunctionNoProto:
2024    return CreateType(cast<FunctionType>(Ty), Unit);
2025  case Type::ConstantArray:
2026  case Type::VariableArray:
2027  case Type::IncompleteArray:
2028    return CreateType(cast<ArrayType>(Ty), Unit);
2029
2030  case Type::LValueReference:
2031    return CreateType(cast<LValueReferenceType>(Ty), Unit);
2032  case Type::RValueReference:
2033    return CreateType(cast<RValueReferenceType>(Ty), Unit);
2034
2035  case Type::MemberPointer:
2036    return CreateType(cast<MemberPointerType>(Ty), Unit);
2037
2038  case Type::Atomic:
2039    return CreateType(cast<AtomicType>(Ty), Unit);
2040
2041  case Type::Attributed:
2042  case Type::TemplateSpecialization:
2043  case Type::Elaborated:
2044  case Type::Paren:
2045  case Type::SubstTemplateTypeParm:
2046  case Type::TypeOfExpr:
2047  case Type::TypeOf:
2048  case Type::Decltype:
2049  case Type::UnaryTransform:
2050    llvm_unreachable("type should have been unwrapped!");
2051  case Type::Auto:
2052    Diag = "auto";
2053    break;
2054  }
2055
2056  assert(Diag && "Fall through without a diagnostic?");
2057  unsigned DiagID = CGM.getDiags().getCustomDiagID(DiagnosticsEngine::Error,
2058                               "debug information for %0 is not yet supported");
2059  CGM.getDiags().Report(DiagID)
2060    << Diag;
2061  return llvm::DIType();
2062}
2063
2064/// getOrCreateLimitedType - Get the type from the cache or create a new
2065/// limited type if necessary.
2066llvm::DIType CGDebugInfo::getOrCreateLimitedType(QualType Ty,
2067                                                 llvm::DIFile Unit) {
2068  if (Ty.isNull())
2069    return llvm::DIType();
2070
2071  // Unwrap the type as needed for debug information.
2072  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2073
2074  llvm::DIType T = getTypeOrNull(Ty);
2075
2076  // We may have cached a forward decl when we could have created
2077  // a non-forward decl. Go ahead and create a non-forward decl
2078  // now.
2079  if (T.Verify() && !T.isForwardDecl()) return T;
2080
2081  // Otherwise create the type.
2082  llvm::DIType Res = CreateLimitedTypeNode(Ty, Unit);
2083
2084  if (T.Verify() && T.isForwardDecl())
2085    ReplaceMap.push_back(std::make_pair(Ty.getAsOpaquePtr(),
2086                                        static_cast<llvm::Value*>(T)));
2087
2088  // And update the type cache.
2089  TypeCache[Ty.getAsOpaquePtr()] = Res;
2090  return Res;
2091}
2092
2093// TODO: Currently used for context chains when limiting debug info.
2094llvm::DIType CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
2095  RecordDecl *RD = Ty->getDecl();
2096
2097  // Get overall information about the record type for the debug info.
2098  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
2099  unsigned Line = getLineNumber(RD->getLocation());
2100  StringRef RDName = getClassName(RD);
2101
2102  llvm::DIDescriptor RDContext;
2103  if (DebugKind == CodeGenOptions::LimitedDebugInfo)
2104    RDContext = createContextChain(cast<Decl>(RD->getDeclContext()));
2105  else
2106    RDContext = getContextDescriptor(cast<Decl>(RD->getDeclContext()));
2107
2108  // If this is just a forward declaration, construct an appropriately
2109  // marked node and just return it.
2110  if (!RD->getDefinition())
2111    return createRecordFwdDecl(RD, RDContext);
2112
2113  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2114  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
2115  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2116  llvm::DICompositeType RealDecl;
2117
2118  if (RD->isUnion())
2119    RealDecl = DBuilder.createUnionType(RDContext, RDName, DefUnit, Line,
2120                                        Size, Align, 0, llvm::DIArray());
2121  else if (RD->isClass()) {
2122    // FIXME: This could be a struct type giving a default visibility different
2123    // than C++ class type, but needs llvm metadata changes first.
2124    RealDecl = DBuilder.createClassType(RDContext, RDName, DefUnit, Line,
2125                                        Size, Align, 0, 0, llvm::DIType(),
2126                                        llvm::DIArray(), llvm::DIType(),
2127                                        llvm::DIArray());
2128  } else
2129    RealDecl = DBuilder.createStructType(RDContext, RDName, DefUnit, Line,
2130                                         Size, Align, 0, llvm::DIType(),
2131                                         llvm::DIArray());
2132
2133  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
2134  TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = RealDecl;
2135
2136  if (CXXDecl) {
2137    // A class's primary base or the class itself contains the vtable.
2138    llvm::DICompositeType ContainingType;
2139    const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2140    if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
2141      // Seek non virtual primary base root.
2142      while (1) {
2143        const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
2144        const CXXRecordDecl *PBT = BRL.getPrimaryBase();
2145        if (PBT && !BRL.isPrimaryBaseVirtual())
2146          PBase = PBT;
2147        else
2148          break;
2149      }
2150      ContainingType = llvm::DICompositeType(
2151          getOrCreateType(QualType(PBase->getTypeForDecl(), 0), DefUnit));
2152    } else if (CXXDecl->isDynamicClass())
2153      ContainingType = RealDecl;
2154
2155    RealDecl.setContainingType(ContainingType);
2156  }
2157  return llvm::DIType(RealDecl);
2158}
2159
2160/// CreateLimitedTypeNode - Create a new debug type node, but only forward
2161/// declare composite types that haven't been processed yet.
2162llvm::DIType CGDebugInfo::CreateLimitedTypeNode(QualType Ty,llvm::DIFile Unit) {
2163
2164  // Work out details of type.
2165  switch (Ty->getTypeClass()) {
2166#define TYPE(Class, Base)
2167#define ABSTRACT_TYPE(Class, Base)
2168#define NON_CANONICAL_TYPE(Class, Base)
2169#define DEPENDENT_TYPE(Class, Base) case Type::Class:
2170        #include "clang/AST/TypeNodes.def"
2171    llvm_unreachable("Dependent types cannot show up in debug information");
2172
2173  case Type::Record:
2174    return CreateLimitedType(cast<RecordType>(Ty));
2175  default:
2176    return CreateTypeNode(Ty, Unit);
2177  }
2178}
2179
2180/// CreateMemberType - Create new member and increase Offset by FType's size.
2181llvm::DIType CGDebugInfo::CreateMemberType(llvm::DIFile Unit, QualType FType,
2182                                           StringRef Name,
2183                                           uint64_t *Offset) {
2184  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2185  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
2186  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
2187  llvm::DIType Ty = DBuilder.createMemberType(Unit, Name, Unit, 0,
2188                                              FieldSize, FieldAlign,
2189                                              *Offset, 0, FieldTy);
2190  *Offset += FieldSize;
2191  return Ty;
2192}
2193
2194llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
2195  // We only need a declaration (not a definition) of the type - so use whatever
2196  // we would otherwise do to get a type for a pointee. (forward declarations in
2197  // limited debug info, full definitions (if the type definition is available)
2198  // in unlimited debug info)
2199  if (const TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
2200    llvm::DIFile DefUnit = getOrCreateFile(TD->getLocation());
2201    return CreatePointeeType(CGM.getContext().getTypeDeclType(TD), DefUnit);
2202  }
2203  // Otherwise fall back to a fairly rudimentary cache of existing declarations.
2204  // This doesn't handle providing declarations (for functions or variables) for
2205  // entities without definitions in this TU, nor when the definition proceeds
2206  // the call to this function.
2207  // FIXME: This should be split out into more specific maps with support for
2208  // emitting forward declarations and merging definitions with declarations,
2209  // the same way as we do for types.
2210  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator I =
2211      DeclCache.find(D->getCanonicalDecl());
2212  if (I == DeclCache.end())
2213    return llvm::DIDescriptor();
2214  llvm::Value *V = I->second;
2215  return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
2216}
2217
2218/// getFunctionDeclaration - Return debug info descriptor to describe method
2219/// declaration for the given method definition.
2220llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
2221  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
2222  if (!FD) return llvm::DISubprogram();
2223
2224  // Setup context.
2225  getContextDescriptor(cast<Decl>(D->getDeclContext()));
2226
2227  llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2228    MI = SPCache.find(FD->getCanonicalDecl());
2229  if (MI != SPCache.end()) {
2230    llvm::Value *V = MI->second;
2231    llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2232    if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
2233      return SP;
2234  }
2235
2236  for (FunctionDecl::redecl_iterator I = FD->redecls_begin(),
2237         E = FD->redecls_end(); I != E; ++I) {
2238    const FunctionDecl *NextFD = *I;
2239    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2240      MI = SPCache.find(NextFD->getCanonicalDecl());
2241    if (MI != SPCache.end()) {
2242      llvm::Value *V = MI->second;
2243      llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2244      if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
2245        return SP;
2246    }
2247  }
2248  return llvm::DISubprogram();
2249}
2250
2251// getOrCreateFunctionType - Construct DIType. If it is a c++ method, include
2252// implicit parameter "this".
2253llvm::DICompositeType CGDebugInfo::getOrCreateFunctionType(const Decl *D,
2254                                                           QualType FnType,
2255                                                           llvm::DIFile F) {
2256
2257  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
2258    return getOrCreateMethodType(Method, F);
2259  if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
2260    // Add "self" and "_cmd"
2261    SmallVector<llvm::Value *, 16> Elts;
2262
2263    // First element is always return type. For 'void' functions it is NULL.
2264    QualType ResultTy = OMethod->getResultType();
2265
2266    // Replace the instancetype keyword with the actual type.
2267    if (ResultTy == CGM.getContext().getObjCInstanceType())
2268      ResultTy = CGM.getContext().getPointerType(
2269        QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
2270
2271    Elts.push_back(getOrCreateType(ResultTy, F));
2272    // "self" pointer is always first argument.
2273    QualType SelfDeclTy = OMethod->getSelfDecl()->getType();
2274    llvm::DIType SelfTy = getOrCreateType(SelfDeclTy, F);
2275    Elts.push_back(CreateSelfType(SelfDeclTy, SelfTy));
2276    // "_cmd" pointer is always second argument.
2277    llvm::DIType CmdTy = getOrCreateType(OMethod->getCmdDecl()->getType(), F);
2278    Elts.push_back(DBuilder.createArtificialType(CmdTy));
2279    // Get rest of the arguments.
2280    for (ObjCMethodDecl::param_const_iterator PI = OMethod->param_begin(),
2281           PE = OMethod->param_end(); PI != PE; ++PI)
2282      Elts.push_back(getOrCreateType((*PI)->getType(), F));
2283
2284    llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
2285    return DBuilder.createSubroutineType(F, EltTypeArray);
2286  }
2287  return llvm::DICompositeType(getOrCreateType(FnType, F));
2288}
2289
2290/// EmitFunctionStart - Constructs the debug code for entering a function.
2291void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
2292                                    llvm::Function *Fn,
2293                                    CGBuilderTy &Builder) {
2294
2295  StringRef Name;
2296  StringRef LinkageName;
2297
2298  FnBeginRegionCount.push_back(LexicalBlockStack.size());
2299
2300  const Decl *D = GD.getDecl();
2301  // Function may lack declaration in source code if it is created by Clang
2302  // CodeGen (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk).
2303  bool HasDecl = (D != 0);
2304  // Use the location of the declaration.
2305  SourceLocation Loc;
2306  if (HasDecl)
2307    Loc = D->getLocation();
2308
2309  unsigned Flags = 0;
2310  llvm::DIFile Unit = getOrCreateFile(Loc);
2311  llvm::DIDescriptor FDContext(Unit);
2312  llvm::DIArray TParamsArray;
2313  if (!HasDecl) {
2314    // Use llvm function name.
2315    Name = Fn->getName();
2316  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2317    // If there is a DISubprogram for this function available then use it.
2318    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2319      FI = SPCache.find(FD->getCanonicalDecl());
2320    if (FI != SPCache.end()) {
2321      llvm::Value *V = FI->second;
2322      llvm::DIDescriptor SP(dyn_cast_or_null<llvm::MDNode>(V));
2323      if (SP.isSubprogram() && llvm::DISubprogram(SP).isDefinition()) {
2324        llvm::MDNode *SPN = SP;
2325        LexicalBlockStack.push_back(SPN);
2326        RegionMap[D] = llvm::WeakVH(SP);
2327        return;
2328      }
2329    }
2330    Name = getFunctionName(FD);
2331    // Use mangled name as linkage name for C/C++ functions.
2332    if (FD->hasPrototype()) {
2333      LinkageName = CGM.getMangledName(GD);
2334      Flags |= llvm::DIDescriptor::FlagPrototyped;
2335    }
2336    // No need to replicate the linkage name if it isn't different from the
2337    // subprogram name, no need to have it at all unless coverage is enabled or
2338    // debug is set to more than just line tables.
2339    if (LinkageName == Name ||
2340        (!CGM.getCodeGenOpts().EmitGcovArcs &&
2341         !CGM.getCodeGenOpts().EmitGcovNotes &&
2342         DebugKind <= CodeGenOptions::DebugLineTablesOnly))
2343      LinkageName = StringRef();
2344
2345    if (DebugKind >= CodeGenOptions::LimitedDebugInfo) {
2346      if (const NamespaceDecl *NSDecl =
2347          dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
2348        FDContext = getOrCreateNameSpace(NSDecl);
2349      else if (const RecordDecl *RDecl =
2350               dyn_cast_or_null<RecordDecl>(FD->getDeclContext()))
2351        FDContext = getContextDescriptor(cast<Decl>(RDecl->getDeclContext()));
2352
2353      // Collect template parameters.
2354      TParamsArray = CollectFunctionTemplateParams(FD, Unit);
2355    }
2356  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
2357    Name = getObjCMethodName(OMD);
2358    Flags |= llvm::DIDescriptor::FlagPrototyped;
2359  } else {
2360    // Use llvm function name.
2361    Name = Fn->getName();
2362    Flags |= llvm::DIDescriptor::FlagPrototyped;
2363  }
2364  if (!Name.empty() && Name[0] == '\01')
2365    Name = Name.substr(1);
2366
2367  unsigned LineNo = getLineNumber(Loc);
2368  if (!HasDecl || D->isImplicit())
2369    Flags |= llvm::DIDescriptor::FlagArtificial;
2370
2371  llvm::DICompositeType DIFnType;
2372  llvm::DISubprogram SPDecl;
2373  if (HasDecl &&
2374      DebugKind >= CodeGenOptions::LimitedDebugInfo) {
2375    DIFnType = getOrCreateFunctionType(D, FnType, Unit);
2376    SPDecl = getFunctionDeclaration(D);
2377  } else {
2378    // Create fake but valid subroutine type. Otherwise
2379    // llvm::DISubprogram::Verify() would return false, and
2380    // subprogram DIE will miss DW_AT_decl_file and
2381    // DW_AT_decl_line fields.
2382    SmallVector<llvm::Value*, 16> Elts;
2383    llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
2384    DIFnType = DBuilder.createSubroutineType(Unit, EltTypeArray);
2385  }
2386  llvm::DISubprogram SP;
2387  SP = DBuilder.createFunction(FDContext, Name, LinkageName, Unit,
2388                               LineNo, DIFnType,
2389                               Fn->hasInternalLinkage(), true/*definition*/,
2390                               getLineNumber(CurLoc), Flags,
2391                               CGM.getLangOpts().Optimize,
2392                               Fn, TParamsArray, SPDecl);
2393  if (HasDecl)
2394    DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(SP)));
2395
2396  // Push function on region stack.
2397  llvm::MDNode *SPN = SP;
2398  LexicalBlockStack.push_back(SPN);
2399  if (HasDecl)
2400    RegionMap[D] = llvm::WeakVH(SP);
2401}
2402
2403/// EmitLocation - Emit metadata to indicate a change in line/column
2404/// information in the source file.
2405void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc,
2406                               bool ForceColumnInfo) {
2407
2408  // Update our current location
2409  setLocation(Loc);
2410
2411  if (CurLoc.isInvalid() || CurLoc.isMacroID()) return;
2412
2413  // Don't bother if things are the same as last time.
2414  SourceManager &SM = CGM.getContext().getSourceManager();
2415  if (CurLoc == PrevLoc ||
2416      SM.getExpansionLoc(CurLoc) == SM.getExpansionLoc(PrevLoc))
2417    // New Builder may not be in sync with CGDebugInfo.
2418    if (!Builder.getCurrentDebugLocation().isUnknown() &&
2419        Builder.getCurrentDebugLocation().getScope(CGM.getLLVMContext()) ==
2420          LexicalBlockStack.back())
2421      return;
2422
2423  // Update last state.
2424  PrevLoc = CurLoc;
2425
2426  llvm::MDNode *Scope = LexicalBlockStack.back();
2427  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get
2428                                  (getLineNumber(CurLoc),
2429                                   getColumnNumber(CurLoc, ForceColumnInfo),
2430                                   Scope));
2431}
2432
2433/// CreateLexicalBlock - Creates a new lexical block node and pushes it on
2434/// the stack.
2435void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
2436  llvm::DIDescriptor D =
2437    DBuilder.createLexicalBlock(LexicalBlockStack.empty() ?
2438                                llvm::DIDescriptor() :
2439                                llvm::DIDescriptor(LexicalBlockStack.back()),
2440                                getOrCreateFile(CurLoc),
2441                                getLineNumber(CurLoc),
2442                                getColumnNumber(CurLoc));
2443  llvm::MDNode *DN = D;
2444  LexicalBlockStack.push_back(DN);
2445}
2446
2447/// EmitLexicalBlockStart - Constructs the debug code for entering a declarative
2448/// region - beginning of a DW_TAG_lexical_block.
2449void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
2450                                        SourceLocation Loc) {
2451  // Set our current location.
2452  setLocation(Loc);
2453
2454  // Create a new lexical block and push it on the stack.
2455  CreateLexicalBlock(Loc);
2456
2457  // Emit a line table change for the current location inside the new scope.
2458  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(Loc),
2459                                  getColumnNumber(Loc),
2460                                  LexicalBlockStack.back()));
2461}
2462
2463/// EmitLexicalBlockEnd - Constructs the debug code for exiting a declarative
2464/// region - end of a DW_TAG_lexical_block.
2465void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
2466                                      SourceLocation Loc) {
2467  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2468
2469  // Provide an entry in the line table for the end of the block.
2470  EmitLocation(Builder, Loc);
2471
2472  LexicalBlockStack.pop_back();
2473}
2474
2475/// EmitFunctionEnd - Constructs the debug code for exiting a function.
2476void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
2477  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2478  unsigned RCount = FnBeginRegionCount.back();
2479  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
2480
2481  // Pop all regions for this function.
2482  while (LexicalBlockStack.size() != RCount)
2483    EmitLexicalBlockEnd(Builder, CurLoc);
2484  FnBeginRegionCount.pop_back();
2485}
2486
2487// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
2488// See BuildByRefType.
2489llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
2490                                                       uint64_t *XOffset) {
2491
2492  SmallVector<llvm::Value *, 5> EltTys;
2493  QualType FType;
2494  uint64_t FieldSize, FieldOffset;
2495  unsigned FieldAlign;
2496
2497  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2498  QualType Type = VD->getType();
2499
2500  FieldOffset = 0;
2501  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2502  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
2503  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
2504  FType = CGM.getContext().IntTy;
2505  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
2506  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
2507
2508  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
2509  if (HasCopyAndDispose) {
2510    FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2511    EltTys.push_back(CreateMemberType(Unit, FType, "__copy_helper",
2512                                      &FieldOffset));
2513    EltTys.push_back(CreateMemberType(Unit, FType, "__destroy_helper",
2514                                      &FieldOffset));
2515  }
2516  bool HasByrefExtendedLayout;
2517  Qualifiers::ObjCLifetime Lifetime;
2518  if (CGM.getContext().getByrefLifetime(Type,
2519                                        Lifetime, HasByrefExtendedLayout)
2520      && HasByrefExtendedLayout)
2521    EltTys.push_back(CreateMemberType(Unit, FType,
2522                                      "__byref_variable_layout",
2523                                      &FieldOffset));
2524
2525  CharUnits Align = CGM.getContext().getDeclAlign(VD);
2526  if (Align > CGM.getContext().toCharUnitsFromBits(
2527        CGM.getTarget().getPointerAlign(0))) {
2528    CharUnits FieldOffsetInBytes
2529      = CGM.getContext().toCharUnitsFromBits(FieldOffset);
2530    CharUnits AlignedOffsetInBytes
2531      = FieldOffsetInBytes.RoundUpToAlignment(Align);
2532    CharUnits NumPaddingBytes
2533      = AlignedOffsetInBytes - FieldOffsetInBytes;
2534
2535    if (NumPaddingBytes.isPositive()) {
2536      llvm::APInt pad(32, NumPaddingBytes.getQuantity());
2537      FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
2538                                                    pad, ArrayType::Normal, 0);
2539      EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
2540    }
2541  }
2542
2543  FType = Type;
2544  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2545  FieldSize = CGM.getContext().getTypeSize(FType);
2546  FieldAlign = CGM.getContext().toBits(Align);
2547
2548  *XOffset = FieldOffset;
2549  FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit,
2550                                      0, FieldSize, FieldAlign,
2551                                      FieldOffset, 0, FieldTy);
2552  EltTys.push_back(FieldTy);
2553  FieldOffset += FieldSize;
2554
2555  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
2556
2557  unsigned Flags = llvm::DIDescriptor::FlagBlockByrefStruct;
2558
2559  return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
2560                                   llvm::DIType(), Elements);
2561}
2562
2563/// EmitDeclare - Emit local variable declaration debug info.
2564void CGDebugInfo::EmitDeclare(const VarDecl *VD, unsigned Tag,
2565                              llvm::Value *Storage,
2566                              unsigned ArgNo, CGBuilderTy &Builder) {
2567  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2568  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2569
2570  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2571  llvm::DIType Ty;
2572  uint64_t XOffset = 0;
2573  if (VD->hasAttr<BlocksAttr>())
2574    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2575  else
2576    Ty = getOrCreateType(VD->getType(), Unit);
2577
2578  // If there is no debug info for this type then do not emit debug info
2579  // for this variable.
2580  if (!Ty)
2581    return;
2582
2583  if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage)) {
2584    // If Storage is an aggregate returned as 'sret' then let debugger know
2585    // about this.
2586    if (Arg->hasStructRetAttr())
2587      Ty = DBuilder.createReferenceType(llvm::dwarf::DW_TAG_reference_type, Ty);
2588    else if (CXXRecordDecl *Record = VD->getType()->getAsCXXRecordDecl()) {
2589      // If an aggregate variable has non trivial destructor or non trivial copy
2590      // constructor than it is pass indirectly. Let debug info know about this
2591      // by using reference of the aggregate type as a argument type.
2592      if (Record->hasNonTrivialCopyConstructor() ||
2593          !Record->hasTrivialDestructor())
2594        Ty = DBuilder.createReferenceType(llvm::dwarf::DW_TAG_reference_type,
2595                                          Ty);
2596    }
2597  }
2598
2599  // Get location information.
2600  unsigned Line = getLineNumber(VD->getLocation());
2601  unsigned Column = getColumnNumber(VD->getLocation());
2602  unsigned Flags = 0;
2603  if (VD->isImplicit())
2604    Flags |= llvm::DIDescriptor::FlagArtificial;
2605  // If this is the first argument and it is implicit then
2606  // give it an object pointer flag.
2607  // FIXME: There has to be a better way to do this, but for static
2608  // functions there won't be an implicit param at arg1 and
2609  // otherwise it is 'self' or 'this'.
2610  if (isa<ImplicitParamDecl>(VD) && ArgNo == 1)
2611    Flags |= llvm::DIDescriptor::FlagObjectPointer;
2612
2613  llvm::MDNode *Scope = LexicalBlockStack.back();
2614
2615  StringRef Name = VD->getName();
2616  if (!Name.empty()) {
2617    if (VD->hasAttr<BlocksAttr>()) {
2618      CharUnits offset = CharUnits::fromQuantity(32);
2619      SmallVector<llvm::Value *, 9> addr;
2620      llvm::Type *Int64Ty = CGM.Int64Ty;
2621      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2622      // offset of __forwarding field
2623      offset = CGM.getContext().toCharUnitsFromBits(
2624        CGM.getTarget().getPointerWidth(0));
2625      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2626      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2627      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2628      // offset of x field
2629      offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2630      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2631
2632      // Create the descriptor for the variable.
2633      llvm::DIVariable D =
2634        DBuilder.createComplexVariable(Tag,
2635                                       llvm::DIDescriptor(Scope),
2636                                       VD->getName(), Unit, Line, Ty,
2637                                       addr, ArgNo);
2638
2639      // Insert an llvm.dbg.declare into the current block.
2640      llvm::Instruction *Call =
2641        DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2642      Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2643      return;
2644    } else if (isa<VariableArrayType>(VD->getType())) {
2645      // These are "complex" variables in that they need an op_deref.
2646      // Create the descriptor for the variable.
2647      llvm::Value *Addr = llvm::ConstantInt::get(CGM.Int64Ty,
2648                                                 llvm::DIBuilder::OpDeref);
2649      llvm::DIVariable D =
2650        DBuilder.createComplexVariable(Tag,
2651                                       llvm::DIDescriptor(Scope),
2652                                       Name, Unit, Line, Ty,
2653                                       Addr, ArgNo);
2654
2655      // Insert an llvm.dbg.declare into the current block.
2656      llvm::Instruction *Call =
2657        DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2658      Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2659      return;
2660    }
2661  } else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
2662    // If VD is an anonymous union then Storage represents value for
2663    // all union fields.
2664    const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
2665    if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
2666      for (RecordDecl::field_iterator I = RD->field_begin(),
2667             E = RD->field_end();
2668           I != E; ++I) {
2669        FieldDecl *Field = *I;
2670        llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
2671        StringRef FieldName = Field->getName();
2672
2673        // Ignore unnamed fields. Do not ignore unnamed records.
2674        if (FieldName.empty() && !isa<RecordType>(Field->getType()))
2675          continue;
2676
2677        // Use VarDecl's Tag, Scope and Line number.
2678        llvm::DIVariable D =
2679          DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2680                                       FieldName, Unit, Line, FieldTy,
2681                                       CGM.getLangOpts().Optimize, Flags,
2682                                       ArgNo);
2683
2684        // Insert an llvm.dbg.declare into the current block.
2685        llvm::Instruction *Call =
2686          DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2687        Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2688      }
2689      return;
2690    }
2691  }
2692
2693  // Create the descriptor for the variable.
2694  llvm::DIVariable D =
2695    DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2696                                 Name, Unit, Line, Ty,
2697                                 CGM.getLangOpts().Optimize, Flags, ArgNo);
2698
2699  // Insert an llvm.dbg.declare into the current block.
2700  llvm::Instruction *Call =
2701    DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2702  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2703}
2704
2705void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
2706                                            llvm::Value *Storage,
2707                                            CGBuilderTy &Builder) {
2708  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2709  EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, 0, Builder);
2710}
2711
2712/// Look up the completed type for a self pointer in the TypeCache and
2713/// create a copy of it with the ObjectPointer and Artificial flags
2714/// set. If the type is not cached, a new one is created. This should
2715/// never happen though, since creating a type for the implicit self
2716/// argument implies that we already parsed the interface definition
2717/// and the ivar declarations in the implementation.
2718llvm::DIType CGDebugInfo::CreateSelfType(const QualType &QualTy,
2719                                         llvm::DIType Ty) {
2720  llvm::DIType CachedTy = getTypeOrNull(QualTy);
2721  if (CachedTy.Verify()) Ty = CachedTy;
2722  else DEBUG(llvm::dbgs() << "No cached type for self.");
2723  return DBuilder.createObjectPointerType(Ty);
2724}
2725
2726void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(const VarDecl *VD,
2727                                                    llvm::Value *Storage,
2728                                                    CGBuilderTy &Builder,
2729                                                 const CGBlockInfo &blockInfo) {
2730  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2731  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2732
2733  if (Builder.GetInsertBlock() == 0)
2734    return;
2735
2736  bool isByRef = VD->hasAttr<BlocksAttr>();
2737
2738  uint64_t XOffset = 0;
2739  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2740  llvm::DIType Ty;
2741  if (isByRef)
2742    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2743  else
2744    Ty = getOrCreateType(VD->getType(), Unit);
2745
2746  // Self is passed along as an implicit non-arg variable in a
2747  // block. Mark it as the object pointer.
2748  if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
2749    Ty = CreateSelfType(VD->getType(), Ty);
2750
2751  // Get location information.
2752  unsigned Line = getLineNumber(VD->getLocation());
2753  unsigned Column = getColumnNumber(VD->getLocation());
2754
2755  const llvm::DataLayout &target = CGM.getDataLayout();
2756
2757  CharUnits offset = CharUnits::fromQuantity(
2758    target.getStructLayout(blockInfo.StructureType)
2759          ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
2760
2761  SmallVector<llvm::Value *, 9> addr;
2762  llvm::Type *Int64Ty = CGM.Int64Ty;
2763  if (isa<llvm::AllocaInst>(Storage))
2764    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2765  addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2766  addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2767  if (isByRef) {
2768    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2769    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2770    // offset of __forwarding field
2771    offset = CGM.getContext()
2772                .toCharUnitsFromBits(target.getPointerSizeInBits(0));
2773    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2774    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2775    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2776    // offset of x field
2777    offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2778    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2779  }
2780
2781  // Create the descriptor for the variable.
2782  llvm::DIVariable D =
2783    DBuilder.createComplexVariable(llvm::dwarf::DW_TAG_auto_variable,
2784                                   llvm::DIDescriptor(LexicalBlockStack.back()),
2785                                   VD->getName(), Unit, Line, Ty, addr);
2786
2787  // Insert an llvm.dbg.declare into the current block.
2788  llvm::Instruction *Call =
2789    DBuilder.insertDeclare(Storage, D, Builder.GetInsertPoint());
2790  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column,
2791                                        LexicalBlockStack.back()));
2792}
2793
2794/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
2795/// variable declaration.
2796void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
2797                                           unsigned ArgNo,
2798                                           CGBuilderTy &Builder) {
2799  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2800  EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, ArgNo, Builder);
2801}
2802
2803namespace {
2804  struct BlockLayoutChunk {
2805    uint64_t OffsetInBits;
2806    const BlockDecl::Capture *Capture;
2807  };
2808  bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
2809    return l.OffsetInBits < r.OffsetInBits;
2810  }
2811}
2812
2813void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
2814                                                       llvm::Value *Arg,
2815                                                       llvm::Value *LocalAddr,
2816                                                       CGBuilderTy &Builder) {
2817  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2818  ASTContext &C = CGM.getContext();
2819  const BlockDecl *blockDecl = block.getBlockDecl();
2820
2821  // Collect some general information about the block's location.
2822  SourceLocation loc = blockDecl->getCaretLocation();
2823  llvm::DIFile tunit = getOrCreateFile(loc);
2824  unsigned line = getLineNumber(loc);
2825  unsigned column = getColumnNumber(loc);
2826
2827  // Build the debug-info type for the block literal.
2828  getContextDescriptor(cast<Decl>(blockDecl->getDeclContext()));
2829
2830  const llvm::StructLayout *blockLayout =
2831    CGM.getDataLayout().getStructLayout(block.StructureType);
2832
2833  SmallVector<llvm::Value*, 16> fields;
2834  fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
2835                                   blockLayout->getElementOffsetInBits(0),
2836                                   tunit, tunit));
2837  fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
2838                                   blockLayout->getElementOffsetInBits(1),
2839                                   tunit, tunit));
2840  fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
2841                                   blockLayout->getElementOffsetInBits(2),
2842                                   tunit, tunit));
2843  fields.push_back(createFieldType("__FuncPtr", C.VoidPtrTy, 0, loc, AS_public,
2844                                   blockLayout->getElementOffsetInBits(3),
2845                                   tunit, tunit));
2846  fields.push_back(createFieldType("__descriptor",
2847                                   C.getPointerType(block.NeedsCopyDispose ?
2848                                        C.getBlockDescriptorExtendedType() :
2849                                        C.getBlockDescriptorType()),
2850                                   0, loc, AS_public,
2851                                   blockLayout->getElementOffsetInBits(4),
2852                                   tunit, tunit));
2853
2854  // We want to sort the captures by offset, not because DWARF
2855  // requires this, but because we're paranoid about debuggers.
2856  SmallVector<BlockLayoutChunk, 8> chunks;
2857
2858  // 'this' capture.
2859  if (blockDecl->capturesCXXThis()) {
2860    BlockLayoutChunk chunk;
2861    chunk.OffsetInBits =
2862      blockLayout->getElementOffsetInBits(block.CXXThisIndex);
2863    chunk.Capture = 0;
2864    chunks.push_back(chunk);
2865  }
2866
2867  // Variable captures.
2868  for (BlockDecl::capture_const_iterator
2869         i = blockDecl->capture_begin(), e = blockDecl->capture_end();
2870       i != e; ++i) {
2871    const BlockDecl::Capture &capture = *i;
2872    const VarDecl *variable = capture.getVariable();
2873    const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
2874
2875    // Ignore constant captures.
2876    if (captureInfo.isConstant())
2877      continue;
2878
2879    BlockLayoutChunk chunk;
2880    chunk.OffsetInBits =
2881      blockLayout->getElementOffsetInBits(captureInfo.getIndex());
2882    chunk.Capture = &capture;
2883    chunks.push_back(chunk);
2884  }
2885
2886  // Sort by offset.
2887  llvm::array_pod_sort(chunks.begin(), chunks.end());
2888
2889  for (SmallVectorImpl<BlockLayoutChunk>::iterator
2890         i = chunks.begin(), e = chunks.end(); i != e; ++i) {
2891    uint64_t offsetInBits = i->OffsetInBits;
2892    const BlockDecl::Capture *capture = i->Capture;
2893
2894    // If we have a null capture, this must be the C++ 'this' capture.
2895    if (!capture) {
2896      const CXXMethodDecl *method =
2897        cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
2898      QualType type = method->getThisType(C);
2899
2900      fields.push_back(createFieldType("this", type, 0, loc, AS_public,
2901                                       offsetInBits, tunit, tunit));
2902      continue;
2903    }
2904
2905    const VarDecl *variable = capture->getVariable();
2906    StringRef name = variable->getName();
2907
2908    llvm::DIType fieldType;
2909    if (capture->isByRef()) {
2910      std::pair<uint64_t,unsigned> ptrInfo = C.getTypeInfo(C.VoidPtrTy);
2911
2912      // FIXME: this creates a second copy of this type!
2913      uint64_t xoffset;
2914      fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
2915      fieldType = DBuilder.createPointerType(fieldType, ptrInfo.first);
2916      fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
2917                                            ptrInfo.first, ptrInfo.second,
2918                                            offsetInBits, 0, fieldType);
2919    } else {
2920      fieldType = createFieldType(name, variable->getType(), 0,
2921                                  loc, AS_public, offsetInBits, tunit, tunit);
2922    }
2923    fields.push_back(fieldType);
2924  }
2925
2926  SmallString<36> typeName;
2927  llvm::raw_svector_ostream(typeName)
2928    << "__block_literal_" << CGM.getUniqueBlockCount();
2929
2930  llvm::DIArray fieldsArray = DBuilder.getOrCreateArray(fields);
2931
2932  llvm::DIType type =
2933    DBuilder.createStructType(tunit, typeName.str(), tunit, line,
2934                              CGM.getContext().toBits(block.BlockSize),
2935                              CGM.getContext().toBits(block.BlockAlign),
2936                              0, llvm::DIType(), fieldsArray);
2937  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
2938
2939  // Get overall information about the block.
2940  unsigned flags = llvm::DIDescriptor::FlagArtificial;
2941  llvm::MDNode *scope = LexicalBlockStack.back();
2942
2943  // Create the descriptor for the parameter.
2944  llvm::DIVariable debugVar =
2945    DBuilder.createLocalVariable(llvm::dwarf::DW_TAG_arg_variable,
2946                                 llvm::DIDescriptor(scope),
2947                                 Arg->getName(), tunit, line, type,
2948                                 CGM.getLangOpts().Optimize, flags,
2949                                 cast<llvm::Argument>(Arg)->getArgNo() + 1);
2950
2951  if (LocalAddr) {
2952    // Insert an llvm.dbg.value into the current block.
2953    llvm::Instruction *DbgVal =
2954      DBuilder.insertDbgValueIntrinsic(LocalAddr, 0, debugVar,
2955                                       Builder.GetInsertBlock());
2956    DbgVal->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
2957  }
2958
2959  // Insert an llvm.dbg.declare into the current block.
2960  llvm::Instruction *DbgDecl =
2961    DBuilder.insertDeclare(Arg, debugVar, Builder.GetInsertBlock());
2962  DbgDecl->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
2963}
2964
2965/// getStaticDataMemberDeclaration - If D is an out-of-class definition of
2966/// a static data member of a class, find its corresponding in-class
2967/// declaration.
2968llvm::DIDerivedType CGDebugInfo::getStaticDataMemberDeclaration(const Decl *D) {
2969  if (cast<VarDecl>(D)->isStaticDataMember()) {
2970    llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
2971      MI = StaticDataMemberCache.find(D->getCanonicalDecl());
2972    if (MI != StaticDataMemberCache.end())
2973      // Verify the info still exists.
2974      if (llvm::Value *V = MI->second)
2975        return llvm::DIDerivedType(cast<llvm::MDNode>(V));
2976  }
2977  return llvm::DIDerivedType();
2978}
2979
2980/// EmitGlobalVariable - Emit information about a global variable.
2981void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
2982                                     const VarDecl *D) {
2983  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2984  // Create global variable debug descriptor.
2985  llvm::DIFile Unit = getOrCreateFile(D->getLocation());
2986  unsigned LineNo = getLineNumber(D->getLocation());
2987
2988  setLocation(D->getLocation());
2989
2990  QualType T = D->getType();
2991  if (T->isIncompleteArrayType()) {
2992
2993    // CodeGen turns int[] into int[1] so we'll do the same here.
2994    llvm::APInt ConstVal(32, 1);
2995    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
2996
2997    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
2998                                              ArrayType::Normal, 0);
2999  }
3000  StringRef DeclName = D->getName();
3001  StringRef LinkageName;
3002  if (D->getDeclContext() && !isa<FunctionDecl>(D->getDeclContext())
3003      && !isa<ObjCMethodDecl>(D->getDeclContext()))
3004    LinkageName = Var->getName();
3005  if (LinkageName == DeclName)
3006    LinkageName = StringRef();
3007  llvm::DIDescriptor DContext =
3008    getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()));
3009  llvm::DIGlobalVariable GV = DBuilder.createStaticVariable(DContext, DeclName, LinkageName,
3010                                Unit, LineNo, getOrCreateType(T, Unit),
3011                                Var->hasInternalLinkage(), Var,
3012                                getStaticDataMemberDeclaration(D));
3013  DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(GV)));
3014}
3015
3016/// EmitGlobalVariable - Emit information about an objective-c interface.
3017void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
3018                                     ObjCInterfaceDecl *ID) {
3019  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3020  // Create global variable debug descriptor.
3021  llvm::DIFile Unit = getOrCreateFile(ID->getLocation());
3022  unsigned LineNo = getLineNumber(ID->getLocation());
3023
3024  StringRef Name = ID->getName();
3025
3026  QualType T = CGM.getContext().getObjCInterfaceType(ID);
3027  if (T->isIncompleteArrayType()) {
3028
3029    // CodeGen turns int[] into int[1] so we'll do the same here.
3030    llvm::APInt ConstVal(32, 1);
3031    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3032
3033    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
3034                                           ArrayType::Normal, 0);
3035  }
3036
3037  DBuilder.createGlobalVariable(Name, Unit, LineNo,
3038                                getOrCreateType(T, Unit),
3039                                Var->hasInternalLinkage(), Var);
3040}
3041
3042/// EmitGlobalVariable - Emit global variable's debug info.
3043void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
3044                                     llvm::Constant *Init) {
3045  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3046  // Create the descriptor for the variable.
3047  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
3048  StringRef Name = VD->getName();
3049  llvm::DIType Ty = getOrCreateType(VD->getType(), Unit);
3050  if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
3051    const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
3052    assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
3053    Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
3054  }
3055  // Do not use DIGlobalVariable for enums.
3056  if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
3057    return;
3058  llvm::DIGlobalVariable GV = DBuilder.createStaticVariable(Unit, Name, Name, Unit,
3059                                getLineNumber(VD->getLocation()),
3060                                Ty, true, Init,
3061                                getStaticDataMemberDeclaration(VD));
3062  DeclCache.insert(std::make_pair(VD->getCanonicalDecl(), llvm::WeakVH(GV)));
3063}
3064
3065llvm::DIScope CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
3066  if (!LexicalBlockStack.empty())
3067    return llvm::DIScope(LexicalBlockStack.back());
3068  return getContextDescriptor(D);
3069}
3070
3071void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
3072  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3073    return;
3074  DBuilder.createImportedModule(
3075      getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
3076      getOrCreateNameSpace(UD.getNominatedNamespace()),
3077      getLineNumber(UD.getLocation()));
3078}
3079
3080void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
3081  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3082    return;
3083  assert(UD.shadow_size() &&
3084         "We shouldn't be codegening an invalid UsingDecl containing no decls");
3085  // Emitting one decl is sufficient - debuggers can detect that this is an
3086  // overloaded name & provide lookup for all the overloads.
3087  const UsingShadowDecl &USD = **UD.shadow_begin();
3088  if (llvm::DIDescriptor Target = getDeclarationOrDefinition(USD.getUnderlyingDecl()))
3089    DBuilder.createImportedDeclaration(
3090        getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
3091        getLineNumber(USD.getLocation()));
3092}
3093
3094llvm::DIImportedEntity
3095CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
3096  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3097    return llvm::DIImportedEntity(0);
3098  llvm::WeakVH &VH = NamespaceAliasCache[&NA];
3099  if (VH)
3100    return llvm::DIImportedEntity(cast<llvm::MDNode>(VH));
3101  llvm::DIImportedEntity R(0);
3102  if (const NamespaceAliasDecl *Underlying =
3103          dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
3104    // This could cache & dedup here rather than relying on metadata deduping.
3105    R = DBuilder.createImportedModule(
3106        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3107        EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
3108        NA.getName());
3109  else
3110    R = DBuilder.createImportedModule(
3111        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3112        getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
3113        getLineNumber(NA.getLocation()), NA.getName());
3114  VH = R;
3115  return R;
3116}
3117
3118/// getOrCreateNamesSpace - Return namespace descriptor for the given
3119/// namespace decl.
3120llvm::DINameSpace
3121CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
3122  llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH>::iterator I =
3123    NameSpaceCache.find(NSDecl);
3124  if (I != NameSpaceCache.end())
3125    return llvm::DINameSpace(cast<llvm::MDNode>(I->second));
3126
3127  unsigned LineNo = getLineNumber(NSDecl->getLocation());
3128  llvm::DIFile FileD = getOrCreateFile(NSDecl->getLocation());
3129  llvm::DIDescriptor Context =
3130    getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()));
3131  llvm::DINameSpace NS =
3132    DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
3133  NameSpaceCache[NSDecl] = llvm::WeakVH(NS);
3134  return NS;
3135}
3136
3137void CGDebugInfo::finalize() {
3138  for (std::vector<std::pair<void *, llvm::WeakVH> >::const_iterator VI
3139         = ReplaceMap.begin(), VE = ReplaceMap.end(); VI != VE; ++VI) {
3140    llvm::DIType Ty, RepTy;
3141    // Verify that the debug info still exists.
3142    if (llvm::Value *V = VI->second)
3143      Ty = llvm::DIType(cast<llvm::MDNode>(V));
3144
3145    llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
3146      TypeCache.find(VI->first);
3147    if (it != TypeCache.end()) {
3148      // Verify that the debug info still exists.
3149      if (llvm::Value *V = it->second)
3150        RepTy = llvm::DIType(cast<llvm::MDNode>(V));
3151    }
3152
3153    if (Ty.Verify() && Ty.isForwardDecl() && RepTy.Verify())
3154      Ty.replaceAllUsesWith(RepTy);
3155  }
3156
3157  // We keep our own list of retained types, because we need to look
3158  // up the final type in the type cache.
3159  for (std::vector<void *>::const_iterator RI = RetainedTypes.begin(),
3160         RE = RetainedTypes.end(); RI != RE; ++RI)
3161    DBuilder.retainType(llvm::DIType(cast<llvm::MDNode>(TypeCache[*RI])));
3162
3163  DBuilder.finalize();
3164}
3165