CGDebugInfo.cpp revision 6e73edfdea30afa2da8055c3d05180b01630092a 
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  CreateCompileUnit();
47}
48
49CGDebugInfo::~CGDebugInfo() {
50  assert(LexicalBlockStack.empty() &&
51         "Region stack mismatch, stack not empty!");
52}
53
54
55NoLocation::NoLocation(CodeGenFunction &CGF, CGBuilderTy &B)
56  : DI(CGF.getDebugInfo()), Builder(B) {
57  if (DI) {
58    SavedLoc = DI->getLocation();
59    DI->CurLoc = SourceLocation();
60    Builder.SetCurrentDebugLocation(llvm::DebugLoc());
61  }
62}
63
64NoLocation::~NoLocation() {
65  if (DI) {
66    assert(Builder.getCurrentDebugLocation().isUnknown());
67    DI->CurLoc = SavedLoc;
68  }
69}
70
71BuiltinLocation::BuiltinLocation(CodeGenFunction &CGF, CGBuilderTy &B)
72  : DI(CGF.getDebugInfo()), Builder(B) {
73  if (DI) {
74    SavedLoc = DI->getLocation();
75    // Sync the Builder.
76    DI->EmitLocation(Builder, SavedLoc);
77    DI->CurLoc = SourceLocation();
78    // Construct a location that has a valid scope, but no line info.
79    llvm::MDNode *Scope = DI->LexicalBlockStack.empty() ?
80      DI->TheCU() : DI->LexicalBlockStack.back();
81    Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(0, 0, Scope));
82  }
83}
84
85BuiltinLocation::~BuiltinLocation() {
86  if (DI) {
87    assert(Builder.getCurrentDebugLocation().getLine() == 0);
88    DI->CurLoc = SavedLoc;
89  }
90}
91
92void CGDebugInfo::setLocation(SourceLocation Loc) {
93  // If the new location isn't valid return.
94  if (Loc.isInvalid()) return;
95
96  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
97
98  // If we've changed files in the middle of a lexical scope go ahead
99  // and create a new lexical scope with file node if it's different
100  // from the one in the scope.
101  if (LexicalBlockStack.empty()) return;
102
103  SourceManager &SM = CGM.getContext().getSourceManager();
104  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
105  PresumedLoc PPLoc = SM.getPresumedLoc(PrevLoc);
106
107  if (PCLoc.isInvalid() || PPLoc.isInvalid() ||
108      !strcmp(PPLoc.getFilename(), PCLoc.getFilename()))
109    return;
110
111  llvm::MDNode *LB = LexicalBlockStack.back();
112  llvm::DIScope Scope = llvm::DIScope(LB);
113  if (Scope.isLexicalBlockFile()) {
114    llvm::DILexicalBlockFile LBF = llvm::DILexicalBlockFile(LB);
115    llvm::DIDescriptor D
116      = DBuilder.createLexicalBlockFile(LBF.getScope(),
117                                        getOrCreateFile(CurLoc));
118    llvm::MDNode *N = D;
119    LexicalBlockStack.pop_back();
120    LexicalBlockStack.push_back(N);
121  } else if (Scope.isLexicalBlock() || Scope.isSubprogram()) {
122    llvm::DIDescriptor D
123      = DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc));
124    llvm::MDNode *N = D;
125    LexicalBlockStack.pop_back();
126    LexicalBlockStack.push_back(N);
127  }
128}
129
130/// getContextDescriptor - Get context info for the decl.
131llvm::DIScope CGDebugInfo::getContextDescriptor(const Decl *Context) {
132  if (!Context)
133    return TheCU;
134
135  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
136    I = RegionMap.find(Context);
137  if (I != RegionMap.end()) {
138    llvm::Value *V = I->second;
139    return llvm::DIScope(dyn_cast_or_null<llvm::MDNode>(V));
140  }
141
142  // Check namespace.
143  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
144    return getOrCreateNameSpace(NSDecl);
145
146  if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context))
147    if (!RDecl->isDependentType())
148      return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
149                                        getOrCreateMainFile());
150  return TheCU;
151}
152
153/// getFunctionName - Get function name for the given FunctionDecl. If the
154/// name is constructred on demand (e.g. C++ destructor) then the name
155/// is stored on the side.
156StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
157  assert (FD && "Invalid FunctionDecl!");
158  IdentifierInfo *FII = FD->getIdentifier();
159  FunctionTemplateSpecializationInfo *Info
160    = FD->getTemplateSpecializationInfo();
161  if (!Info && FII)
162    return FII->getName();
163
164  // Otherwise construct human readable name for debug info.
165  SmallString<128> NS;
166  llvm::raw_svector_ostream OS(NS);
167  FD->printName(OS);
168
169  // Add any template specialization args.
170  if (Info) {
171    const TemplateArgumentList *TArgs = Info->TemplateArguments;
172    const TemplateArgument *Args = TArgs->data();
173    unsigned NumArgs = TArgs->size();
174    PrintingPolicy Policy(CGM.getLangOpts());
175    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
176                                                          Policy);
177  }
178
179  // Copy this name on the side and use its reference.
180  OS.flush();
181  char *StrPtr = DebugInfoNames.Allocate<char>(NS.size());
182  memcpy(StrPtr, NS.data(), NS.size());
183  return StringRef(StrPtr, NS.size());
184}
185
186StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
187  SmallString<256> MethodName;
188  llvm::raw_svector_ostream OS(MethodName);
189  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
190  const DeclContext *DC = OMD->getDeclContext();
191  if (const ObjCImplementationDecl *OID =
192      dyn_cast<const ObjCImplementationDecl>(DC)) {
193     OS << OID->getName();
194  } else if (const ObjCInterfaceDecl *OID =
195             dyn_cast<const ObjCInterfaceDecl>(DC)) {
196      OS << OID->getName();
197  } else if (const ObjCCategoryImplDecl *OCD =
198             dyn_cast<const ObjCCategoryImplDecl>(DC)){
199      OS << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '(' <<
200          OCD->getIdentifier()->getNameStart() << ')';
201  } else if (isa<ObjCProtocolDecl>(DC)) {
202    // We can extract the type of the class from the self pointer.
203    if (ImplicitParamDecl* SelfDecl = OMD->getSelfDecl()) {
204      QualType ClassTy =
205        cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
206      ClassTy.print(OS, PrintingPolicy(LangOptions()));
207    }
208  }
209  OS << ' ' << OMD->getSelector().getAsString() << ']';
210
211  char *StrPtr = DebugInfoNames.Allocate<char>(OS.tell());
212  memcpy(StrPtr, MethodName.begin(), OS.tell());
213  return StringRef(StrPtr, OS.tell());
214}
215
216/// getSelectorName - Return selector name. This is used for debugging
217/// info.
218StringRef CGDebugInfo::getSelectorName(Selector S) {
219  const std::string &SName = S.getAsString();
220  char *StrPtr = DebugInfoNames.Allocate<char>(SName.size());
221  memcpy(StrPtr, SName.data(), SName.size());
222  return StringRef(StrPtr, SName.size());
223}
224
225/// getClassName - Get class name including template argument list.
226StringRef
227CGDebugInfo::getClassName(const RecordDecl *RD) {
228  const ClassTemplateSpecializationDecl *Spec
229    = dyn_cast<ClassTemplateSpecializationDecl>(RD);
230  if (!Spec)
231    return RD->getName();
232
233  const TemplateArgument *Args;
234  unsigned NumArgs;
235  if (TypeSourceInfo *TAW = Spec->getTypeAsWritten()) {
236    const TemplateSpecializationType *TST =
237      cast<TemplateSpecializationType>(TAW->getType());
238    Args = TST->getArgs();
239    NumArgs = TST->getNumArgs();
240  } else {
241    const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
242    Args = TemplateArgs.data();
243    NumArgs = TemplateArgs.size();
244  }
245  StringRef Name = RD->getIdentifier()->getName();
246  PrintingPolicy Policy(CGM.getLangOpts());
247  SmallString<128> TemplateArgList;
248  {
249    llvm::raw_svector_ostream OS(TemplateArgList);
250    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
251                                                          Policy);
252  }
253
254  // Copy this name on the side and use its reference.
255  size_t Length = Name.size() + TemplateArgList.size();
256  char *StrPtr = DebugInfoNames.Allocate<char>(Length);
257  memcpy(StrPtr, Name.data(), Name.size());
258  memcpy(StrPtr + Name.size(), TemplateArgList.data(), TemplateArgList.size());
259  return StringRef(StrPtr, Length);
260}
261
262/// getOrCreateFile - Get the file debug info descriptor for the input location.
263llvm::DIFile CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
264  if (!Loc.isValid())
265    // If Location is not valid then use main input file.
266    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
267
268  SourceManager &SM = CGM.getContext().getSourceManager();
269  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
270
271  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
272    // If the location is not valid then use main input file.
273    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
274
275  // Cache the results.
276  const char *fname = PLoc.getFilename();
277  llvm::DenseMap<const char *, llvm::WeakVH>::iterator it =
278    DIFileCache.find(fname);
279
280  if (it != DIFileCache.end()) {
281    // Verify that the information still exists.
282    if (llvm::Value *V = it->second)
283      return llvm::DIFile(cast<llvm::MDNode>(V));
284  }
285
286  llvm::DIFile F = DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
287
288  DIFileCache[fname] = F;
289  return F;
290}
291
292/// getOrCreateMainFile - Get the file info for main compile unit.
293llvm::DIFile CGDebugInfo::getOrCreateMainFile() {
294  return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
295}
296
297/// getLineNumber - Get line number for the location. If location is invalid
298/// then use current location.
299unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
300  if (Loc.isInvalid() && CurLoc.isInvalid())
301    return 0;
302  SourceManager &SM = CGM.getContext().getSourceManager();
303  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
304  return PLoc.isValid()? PLoc.getLine() : 0;
305}
306
307/// getColumnNumber - Get column number for the location.
308unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
309  // We may not want column information at all.
310  if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
311    return 0;
312
313  // If the location is invalid then use the current column.
314  if (Loc.isInvalid() && CurLoc.isInvalid())
315    return 0;
316  SourceManager &SM = CGM.getContext().getSourceManager();
317  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
318  return PLoc.isValid()? PLoc.getColumn() : 0;
319}
320
321StringRef CGDebugInfo::getCurrentDirname() {
322  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
323    return CGM.getCodeGenOpts().DebugCompilationDir;
324
325  if (!CWDName.empty())
326    return CWDName;
327  SmallString<256> CWD;
328  llvm::sys::fs::current_path(CWD);
329  char *CompDirnamePtr = DebugInfoNames.Allocate<char>(CWD.size());
330  memcpy(CompDirnamePtr, CWD.data(), CWD.size());
331  return CWDName = StringRef(CompDirnamePtr, CWD.size());
332}
333
334/// CreateCompileUnit - Create new compile unit.
335void CGDebugInfo::CreateCompileUnit() {
336
337  // Get absolute path name.
338  SourceManager &SM = CGM.getContext().getSourceManager();
339  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
340  if (MainFileName.empty())
341    MainFileName = "<unknown>";
342
343  // The main file name provided via the "-main-file-name" option contains just
344  // the file name itself with no path information. This file name may have had
345  // a relative path, so we look into the actual file entry for the main
346  // file to determine the real absolute path for the file.
347  std::string MainFileDir;
348  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
349    MainFileDir = MainFile->getDir()->getName();
350    if (MainFileDir != ".")
351      MainFileName = MainFileDir + "/" + MainFileName;
352  }
353
354  // Save filename string.
355  char *FilenamePtr = DebugInfoNames.Allocate<char>(MainFileName.length());
356  memcpy(FilenamePtr, MainFileName.c_str(), MainFileName.length());
357  StringRef Filename(FilenamePtr, MainFileName.length());
358
359  // Save split dwarf file string.
360  std::string SplitDwarfFile = CGM.getCodeGenOpts().SplitDwarfFile;
361  char *SplitDwarfPtr = DebugInfoNames.Allocate<char>(SplitDwarfFile.length());
362  memcpy(SplitDwarfPtr, SplitDwarfFile.c_str(), SplitDwarfFile.length());
363  StringRef SplitDwarfFilename(SplitDwarfPtr, SplitDwarfFile.length());
364
365  unsigned LangTag;
366  const LangOptions &LO = CGM.getLangOpts();
367  if (LO.CPlusPlus) {
368    if (LO.ObjC1)
369      LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
370    else
371      LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
372  } else if (LO.ObjC1) {
373    LangTag = llvm::dwarf::DW_LANG_ObjC;
374  } else if (LO.C99) {
375    LangTag = llvm::dwarf::DW_LANG_C99;
376  } else {
377    LangTag = llvm::dwarf::DW_LANG_C89;
378  }
379
380  std::string Producer = getClangFullVersion();
381
382  // Figure out which version of the ObjC runtime we have.
383  unsigned RuntimeVers = 0;
384  if (LO.ObjC1)
385    RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
386
387  // Create new compile unit.
388  DBuilder.createCompileUnit(LangTag, Filename, getCurrentDirname(),
389                             Producer, LO.Optimize,
390                             CGM.getCodeGenOpts().DwarfDebugFlags,
391                             RuntimeVers, SplitDwarfFilename);
392  // FIXME - Eliminate TheCU.
393  TheCU = llvm::DICompileUnit(DBuilder.getCU());
394}
395
396/// CreateType - Get the Basic type from the cache or create a new
397/// one if necessary.
398llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
399  unsigned Encoding = 0;
400  StringRef BTName;
401  switch (BT->getKind()) {
402#define BUILTIN_TYPE(Id, SingletonId)
403#define PLACEHOLDER_TYPE(Id, SingletonId) \
404  case BuiltinType::Id:
405#include "clang/AST/BuiltinTypes.def"
406  case BuiltinType::Dependent:
407    llvm_unreachable("Unexpected builtin type");
408  case BuiltinType::NullPtr:
409    return DBuilder.createNullPtrType();
410  case BuiltinType::Void:
411    return llvm::DIType();
412  case BuiltinType::ObjCClass:
413    if (ClassTy.isType())
414      return ClassTy;
415    ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
416                                         "objc_class", TheCU,
417                                         getOrCreateMainFile(), 0);
418    return ClassTy;
419  case BuiltinType::ObjCId: {
420    // typedef struct objc_class *Class;
421    // typedef struct objc_object {
422    //  Class isa;
423    // } *id;
424
425    if (ObjTy.isCompositeType())
426      return ObjTy;
427
428    if (!ClassTy.isType())
429      ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
430                                           "objc_class", TheCU,
431                                           getOrCreateMainFile(), 0);
432
433    unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
434
435    llvm::DIType ISATy = DBuilder.createPointerType(ClassTy, Size);
436
437    ObjTy =
438        DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
439                                  0, 0, 0, 0, llvm::DIType(), llvm::DIArray());
440
441    ObjTy.setTypeArray(DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
442        ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0, 0, ISATy)));
443    return ObjTy;
444  }
445  case BuiltinType::ObjCSel: {
446    if (SelTy.isType())
447      return SelTy;
448    SelTy =
449      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
450                                 "objc_selector", TheCU, getOrCreateMainFile(),
451                                 0);
452    return SelTy;
453  }
454
455  case BuiltinType::OCLImage1d:
456    return getOrCreateStructPtrType("opencl_image1d_t",
457                                    OCLImage1dDITy);
458  case BuiltinType::OCLImage1dArray:
459    return getOrCreateStructPtrType("opencl_image1d_array_t",
460                                    OCLImage1dArrayDITy);
461  case BuiltinType::OCLImage1dBuffer:
462    return getOrCreateStructPtrType("opencl_image1d_buffer_t",
463                                    OCLImage1dBufferDITy);
464  case BuiltinType::OCLImage2d:
465    return getOrCreateStructPtrType("opencl_image2d_t",
466                                    OCLImage2dDITy);
467  case BuiltinType::OCLImage2dArray:
468    return getOrCreateStructPtrType("opencl_image2d_array_t",
469                                    OCLImage2dArrayDITy);
470  case BuiltinType::OCLImage3d:
471    return getOrCreateStructPtrType("opencl_image3d_t",
472                                    OCLImage3dDITy);
473  case BuiltinType::OCLSampler:
474    return DBuilder.createBasicType("opencl_sampler_t",
475                                    CGM.getContext().getTypeSize(BT),
476                                    CGM.getContext().getTypeAlign(BT),
477                                    llvm::dwarf::DW_ATE_unsigned);
478  case BuiltinType::OCLEvent:
479    return getOrCreateStructPtrType("opencl_event_t",
480                                    OCLEventDITy);
481
482  case BuiltinType::UChar:
483  case BuiltinType::Char_U: Encoding = llvm::dwarf::DW_ATE_unsigned_char; break;
484  case BuiltinType::Char_S:
485  case BuiltinType::SChar: Encoding = llvm::dwarf::DW_ATE_signed_char; break;
486  case BuiltinType::Char16:
487  case BuiltinType::Char32: Encoding = llvm::dwarf::DW_ATE_UTF; break;
488  case BuiltinType::UShort:
489  case BuiltinType::UInt:
490  case BuiltinType::UInt128:
491  case BuiltinType::ULong:
492  case BuiltinType::WChar_U:
493  case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
494  case BuiltinType::Short:
495  case BuiltinType::Int:
496  case BuiltinType::Int128:
497  case BuiltinType::Long:
498  case BuiltinType::WChar_S:
499  case BuiltinType::LongLong:  Encoding = llvm::dwarf::DW_ATE_signed; break;
500  case BuiltinType::Bool:      Encoding = llvm::dwarf::DW_ATE_boolean; break;
501  case BuiltinType::Half:
502  case BuiltinType::Float:
503  case BuiltinType::LongDouble:
504  case BuiltinType::Double:    Encoding = llvm::dwarf::DW_ATE_float; break;
505  }
506
507  switch (BT->getKind()) {
508  case BuiltinType::Long:      BTName = "long int"; break;
509  case BuiltinType::LongLong:  BTName = "long long int"; break;
510  case BuiltinType::ULong:     BTName = "long unsigned int"; break;
511  case BuiltinType::ULongLong: BTName = "long long unsigned int"; break;
512  default:
513    BTName = BT->getName(CGM.getLangOpts());
514    break;
515  }
516  // Bit size, align and offset of the type.
517  uint64_t Size = CGM.getContext().getTypeSize(BT);
518  uint64_t Align = CGM.getContext().getTypeAlign(BT);
519  llvm::DIType DbgTy =
520    DBuilder.createBasicType(BTName, Size, Align, Encoding);
521  return DbgTy;
522}
523
524llvm::DIType CGDebugInfo::CreateType(const ComplexType *Ty) {
525  // Bit size, align and offset of the type.
526  unsigned Encoding = llvm::dwarf::DW_ATE_complex_float;
527  if (Ty->isComplexIntegerType())
528    Encoding = llvm::dwarf::DW_ATE_lo_user;
529
530  uint64_t Size = CGM.getContext().getTypeSize(Ty);
531  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
532  llvm::DIType DbgTy =
533    DBuilder.createBasicType("complex", Size, Align, Encoding);
534
535  return DbgTy;
536}
537
538/// CreateCVRType - Get the qualified type from the cache or create
539/// a new one if necessary.
540llvm::DIType CGDebugInfo::CreateQualifiedType(QualType Ty, llvm::DIFile Unit,
541                                              bool Declaration) {
542  QualifierCollector Qc;
543  const Type *T = Qc.strip(Ty);
544
545  // Ignore these qualifiers for now.
546  Qc.removeObjCGCAttr();
547  Qc.removeAddressSpace();
548  Qc.removeObjCLifetime();
549
550  // We will create one Derived type for one qualifier and recurse to handle any
551  // additional ones.
552  unsigned Tag;
553  if (Qc.hasConst()) {
554    Tag = llvm::dwarf::DW_TAG_const_type;
555    Qc.removeConst();
556  } else if (Qc.hasVolatile()) {
557    Tag = llvm::dwarf::DW_TAG_volatile_type;
558    Qc.removeVolatile();
559  } else if (Qc.hasRestrict()) {
560    Tag = llvm::dwarf::DW_TAG_restrict_type;
561    Qc.removeRestrict();
562  } else {
563    assert(Qc.empty() && "Unknown type qualifier for debug info");
564    return getOrCreateType(QualType(T, 0), Unit);
565  }
566
567  llvm::DIType FromTy =
568      getOrCreateType(Qc.apply(CGM.getContext(), T), Unit, Declaration);
569
570  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
571  // CVR derived types.
572  llvm::DIType DbgTy = DBuilder.createQualifiedType(Tag, FromTy);
573
574  return DbgTy;
575}
576
577llvm::DIType CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
578                                     llvm::DIFile Unit) {
579
580  // The frontend treats 'id' as a typedef to an ObjCObjectType,
581  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
582  // debug info, we want to emit 'id' in both cases.
583  if (Ty->isObjCQualifiedIdType())
584      return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
585
586  llvm::DIType DbgTy =
587    CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
588                          Ty->getPointeeType(), Unit);
589  return DbgTy;
590}
591
592llvm::DIType CGDebugInfo::CreateType(const PointerType *Ty,
593                                     llvm::DIFile Unit) {
594  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
595                               Ty->getPointeeType(), Unit);
596}
597
598// Creates a forward declaration for a RecordDecl in the given context.
599llvm::DIType CGDebugInfo::createRecordFwdDecl(const RecordDecl *RD,
600                                              llvm::DIDescriptor Ctx) {
601  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
602  unsigned Line = getLineNumber(RD->getLocation());
603  StringRef RDName = getClassName(RD);
604
605  unsigned Tag = 0;
606  if (RD->isStruct() || RD->isInterface())
607    Tag = llvm::dwarf::DW_TAG_structure_type;
608  else if (RD->isUnion())
609    Tag = llvm::dwarf::DW_TAG_union_type;
610  else {
611    assert(RD->isClass());
612    Tag = llvm::dwarf::DW_TAG_class_type;
613  }
614
615  // Create the type.
616  return DBuilder.createForwardDecl(Tag, RDName, Ctx, DefUnit, Line);
617}
618
619// Walk up the context chain and create forward decls for record decls,
620// and normal descriptors for namespaces.
621llvm::DIDescriptor CGDebugInfo::createContextChain(const Decl *Context) {
622  if (!Context)
623    return TheCU;
624
625  // See if we already have the parent.
626  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
627    I = RegionMap.find(Context);
628  if (I != RegionMap.end()) {
629    llvm::Value *V = I->second;
630    return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
631  }
632
633  // Check namespace.
634  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
635    return llvm::DIDescriptor(getOrCreateNameSpace(NSDecl));
636
637  if (const RecordDecl *RD = dyn_cast<RecordDecl>(Context)) {
638    if (!RD->isDependentType()) {
639      llvm::DIType Ty =
640        getOrCreateLimitedType(CGM.getContext().getTypeDeclType(RD),
641                               getOrCreateMainFile());
642      return llvm::DIDescriptor(Ty);
643    }
644  }
645  return TheCU;
646}
647
648/// getOrCreateTypeDeclaration - Create Pointee type. If Pointee is a record
649/// then emit record's fwd if debug info size reduction is enabled.
650llvm::DIType CGDebugInfo::getOrCreateTypeDeclaration(QualType PointeeTy,
651                                                     llvm::DIFile Unit) {
652  if (DebugKind > CodeGenOptions::LimitedDebugInfo)
653    return getOrCreateType(PointeeTy, Unit);
654  return getOrCreateType(PointeeTy, Unit, true);
655}
656
657llvm::DIType CGDebugInfo::CreatePointerLikeType(unsigned Tag,
658                                                const Type *Ty,
659                                                QualType PointeeTy,
660                                                llvm::DIFile Unit) {
661  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
662      Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
663    return DBuilder.createReferenceType(
664        Tag, getOrCreateTypeDeclaration(PointeeTy, Unit));
665
666  // Bit size, align and offset of the type.
667  // Size is always the size of a pointer. We can't use getTypeSize here
668  // because that does not return the correct value for references.
669  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
670  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
671  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
672
673  return DBuilder.createPointerType(getOrCreateTypeDeclaration(PointeeTy, Unit),
674                                    Size, Align);
675}
676
677llvm::DIType CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
678                                                   llvm::DIType &Cache) {
679  if (Cache.isType())
680    return Cache;
681  Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
682                                     TheCU, getOrCreateMainFile(), 0);
683  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
684  Cache = DBuilder.createPointerType(Cache, Size);
685  return Cache;
686}
687
688llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
689                                     llvm::DIFile Unit) {
690  if (BlockLiteralGeneric.isType())
691    return BlockLiteralGeneric;
692
693  SmallVector<llvm::Value *, 8> EltTys;
694  llvm::DIType FieldTy;
695  QualType FType;
696  uint64_t FieldSize, FieldOffset;
697  unsigned FieldAlign;
698  llvm::DIArray Elements;
699  llvm::DIType EltTy, DescTy;
700
701  FieldOffset = 0;
702  FType = CGM.getContext().UnsignedLongTy;
703  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
704  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
705
706  Elements = DBuilder.getOrCreateArray(EltTys);
707  EltTys.clear();
708
709  unsigned Flags = llvm::DIDescriptor::FlagAppleBlock;
710  unsigned LineNo = getLineNumber(CurLoc);
711
712  EltTy = DBuilder.createStructType(Unit, "__block_descriptor",
713                                    Unit, LineNo, FieldOffset, 0,
714                                    Flags, llvm::DIType(), Elements);
715
716  // Bit size, align and offset of the type.
717  uint64_t Size = CGM.getContext().getTypeSize(Ty);
718
719  DescTy = DBuilder.createPointerType(EltTy, Size);
720
721  FieldOffset = 0;
722  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
723  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
724  FType = CGM.getContext().IntTy;
725  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
726  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
727  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
728  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
729
730  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
731  FieldTy = DescTy;
732  FieldSize = CGM.getContext().getTypeSize(Ty);
733  FieldAlign = CGM.getContext().getTypeAlign(Ty);
734  FieldTy = DBuilder.createMemberType(Unit, "__descriptor", Unit,
735                                      LineNo, FieldSize, FieldAlign,
736                                      FieldOffset, 0, FieldTy);
737  EltTys.push_back(FieldTy);
738
739  FieldOffset += FieldSize;
740  Elements = DBuilder.getOrCreateArray(EltTys);
741
742  EltTy = DBuilder.createStructType(Unit, "__block_literal_generic",
743                                    Unit, LineNo, FieldOffset, 0,
744                                    Flags, llvm::DIType(), Elements);
745
746  BlockLiteralGeneric = DBuilder.createPointerType(EltTy, Size);
747  return BlockLiteralGeneric;
748}
749
750llvm::DIType CGDebugInfo::CreateType(const TypedefType *Ty, llvm::DIFile Unit,
751                                     bool Declaration) {
752  // Typedefs are derived from some other type.  If we have a typedef of a
753  // typedef, make sure to emit the whole chain.
754  llvm::DIType Src =
755      getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit, Declaration);
756  if (!Src.isType())
757    return llvm::DIType();
758  // We don't set size information, but do specify where the typedef was
759  // declared.
760  unsigned Line = getLineNumber(Ty->getDecl()->getLocation());
761  const TypedefNameDecl *TyDecl = Ty->getDecl();
762
763  llvm::DIDescriptor TypedefContext =
764    getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext()));
765
766  return
767    DBuilder.createTypedef(Src, TyDecl->getName(), Unit, Line, TypedefContext);
768}
769
770llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
771                                     llvm::DIFile Unit) {
772  SmallVector<llvm::Value *, 16> EltTys;
773
774  // Add the result type at least.
775  EltTys.push_back(getOrCreateType(Ty->getResultType(), Unit));
776
777  // Set up remainder of arguments if there is a prototype.
778  // FIXME: IF NOT, HOW IS THIS REPRESENTED?  llvm-gcc doesn't represent '...'!
779  if (isa<FunctionNoProtoType>(Ty))
780    EltTys.push_back(DBuilder.createUnspecifiedParameter());
781  else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
782    for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
783      EltTys.push_back(getOrCreateType(FPT->getArgType(i), Unit));
784  }
785
786  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
787  return DBuilder.createSubroutineType(Unit, EltTypeArray);
788}
789
790
791llvm::DIType CGDebugInfo::createFieldType(StringRef name,
792                                          QualType type,
793                                          uint64_t sizeInBitsOverride,
794                                          SourceLocation loc,
795                                          AccessSpecifier AS,
796                                          uint64_t offsetInBits,
797                                          llvm::DIFile tunit,
798                                          llvm::DIDescriptor scope) {
799  llvm::DIType debugType = getOrCreateType(type, tunit);
800
801  // Get the location for the field.
802  llvm::DIFile file = getOrCreateFile(loc);
803  unsigned line = getLineNumber(loc);
804
805  uint64_t sizeInBits = 0;
806  unsigned alignInBits = 0;
807  if (!type->isIncompleteArrayType()) {
808    llvm::tie(sizeInBits, alignInBits) = CGM.getContext().getTypeInfo(type);
809
810    if (sizeInBitsOverride)
811      sizeInBits = sizeInBitsOverride;
812  }
813
814  unsigned flags = 0;
815  if (AS == clang::AS_private)
816    flags |= llvm::DIDescriptor::FlagPrivate;
817  else if (AS == clang::AS_protected)
818    flags |= llvm::DIDescriptor::FlagProtected;
819
820  return DBuilder.createMemberType(scope, name, file, line, sizeInBits,
821                                   alignInBits, offsetInBits, flags, debugType);
822}
823
824/// CollectRecordLambdaFields - Helper for CollectRecordFields.
825void CGDebugInfo::
826CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
827                          SmallVectorImpl<llvm::Value *> &elements,
828                          llvm::DIType RecordTy) {
829  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
830  // has the name and the location of the variable so we should iterate over
831  // both concurrently.
832  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
833  RecordDecl::field_iterator Field = CXXDecl->field_begin();
834  unsigned fieldno = 0;
835  for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
836         E = CXXDecl->captures_end(); I != E; ++I, ++Field, ++fieldno) {
837    const LambdaExpr::Capture C = *I;
838    if (C.capturesVariable()) {
839      VarDecl *V = C.getCapturedVar();
840      llvm::DIFile VUnit = getOrCreateFile(C.getLocation());
841      StringRef VName = V->getName();
842      uint64_t SizeInBitsOverride = 0;
843      if (Field->isBitField()) {
844        SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
845        assert(SizeInBitsOverride && "found named 0-width bitfield");
846      }
847      llvm::DIType fieldType
848        = createFieldType(VName, Field->getType(), SizeInBitsOverride,
849                          C.getLocation(), Field->getAccess(),
850                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
851      elements.push_back(fieldType);
852    } else {
853      // TODO: Need to handle 'this' in some way by probably renaming the
854      // this of the lambda class and having a field member of 'this' or
855      // by using AT_object_pointer for the function and having that be
856      // used as 'this' for semantic references.
857      assert(C.capturesThis() && "Field that isn't captured and isn't this?");
858      FieldDecl *f = *Field;
859      llvm::DIFile VUnit = getOrCreateFile(f->getLocation());
860      QualType type = f->getType();
861      llvm::DIType fieldType
862        = createFieldType("this", type, 0, f->getLocation(), f->getAccess(),
863                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
864
865      elements.push_back(fieldType);
866    }
867  }
868}
869
870/// CollectRecordStaticField - Helper for CollectRecordFields.
871void CGDebugInfo::
872CollectRecordStaticField(const VarDecl *Var,
873                         SmallVectorImpl<llvm::Value *> &elements,
874                         llvm::DIType RecordTy) {
875  // Create the descriptor for the static variable, with or without
876  // constant initializers.
877  llvm::DIFile VUnit = getOrCreateFile(Var->getLocation());
878  llvm::DIType VTy = getOrCreateType(Var->getType(), VUnit);
879
880  // Do not describe enums as static members.
881  if (VTy.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
882    return;
883
884  unsigned LineNumber = getLineNumber(Var->getLocation());
885  StringRef VName = Var->getName();
886  llvm::Constant *C = NULL;
887  if (Var->getInit()) {
888    const APValue *Value = Var->evaluateValue();
889    if (Value) {
890      if (Value->isInt())
891        C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
892      if (Value->isFloat())
893        C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
894    }
895  }
896
897  unsigned Flags = 0;
898  AccessSpecifier Access = Var->getAccess();
899  if (Access == clang::AS_private)
900    Flags |= llvm::DIDescriptor::FlagPrivate;
901  else if (Access == clang::AS_protected)
902    Flags |= llvm::DIDescriptor::FlagProtected;
903
904  llvm::DIType GV = DBuilder.createStaticMemberType(RecordTy, VName, VUnit,
905                                                    LineNumber, VTy, Flags, C);
906  elements.push_back(GV);
907  StaticDataMemberCache[Var->getCanonicalDecl()] = llvm::WeakVH(GV);
908}
909
910/// CollectRecordNormalField - Helper for CollectRecordFields.
911void CGDebugInfo::
912CollectRecordNormalField(const FieldDecl *field, uint64_t OffsetInBits,
913                         llvm::DIFile tunit,
914                         SmallVectorImpl<llvm::Value *> &elements,
915                         llvm::DIType RecordTy) {
916  StringRef name = field->getName();
917  QualType type = field->getType();
918
919  // Ignore unnamed fields unless they're anonymous structs/unions.
920  if (name.empty() && !type->isRecordType())
921    return;
922
923  uint64_t SizeInBitsOverride = 0;
924  if (field->isBitField()) {
925    SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
926    assert(SizeInBitsOverride && "found named 0-width bitfield");
927  }
928
929  llvm::DIType fieldType
930    = createFieldType(name, type, SizeInBitsOverride,
931                      field->getLocation(), field->getAccess(),
932                      OffsetInBits, tunit, RecordTy);
933
934  elements.push_back(fieldType);
935}
936
937/// CollectRecordFields - A helper function to collect debug info for
938/// record fields. This is used while creating debug info entry for a Record.
939void CGDebugInfo::
940CollectRecordFields(const RecordDecl *record, llvm::DIFile tunit,
941                    SmallVectorImpl<llvm::Value *> &elements,
942                    llvm::DIType RecordTy) {
943  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
944
945  if (CXXDecl && CXXDecl->isLambda())
946    CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
947  else {
948    const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
949
950    // Field number for non-static fields.
951    unsigned fieldNo = 0;
952
953    // Static and non-static members should appear in the same order as
954    // the corresponding declarations in the source program.
955    for (RecordDecl::decl_iterator I = record->decls_begin(),
956           E = record->decls_end(); I != E; ++I)
957      if (const VarDecl *V = dyn_cast<VarDecl>(*I))
958        CollectRecordStaticField(V, elements, RecordTy);
959      else if (FieldDecl *field = dyn_cast<FieldDecl>(*I)) {
960        CollectRecordNormalField(field, layout.getFieldOffset(fieldNo),
961                                 tunit, elements, RecordTy);
962
963        // Bump field number for next field.
964        ++fieldNo;
965      }
966  }
967}
968
969/// getOrCreateMethodType - CXXMethodDecl's type is a FunctionType. This
970/// function type is not updated to include implicit "this" pointer. Use this
971/// routine to get a method type which includes "this" pointer.
972llvm::DICompositeType
973CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
974                                   llvm::DIFile Unit) {
975  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
976  if (Method->isStatic())
977    return llvm::DICompositeType(getOrCreateType(QualType(Func, 0), Unit));
978  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
979                                       Func, Unit);
980}
981
982llvm::DICompositeType CGDebugInfo::getOrCreateInstanceMethodType(
983    QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit) {
984  // Add "this" pointer.
985  llvm::DIArray Args = llvm::DICompositeType(
986      getOrCreateType(QualType(Func, 0), Unit)).getTypeArray();
987  assert (Args.getNumElements() && "Invalid number of arguments!");
988
989  SmallVector<llvm::Value *, 16> Elts;
990
991  // First element is always return type. For 'void' functions it is NULL.
992  Elts.push_back(Args.getElement(0));
993
994  // "this" pointer is always first argument.
995  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
996  if (isa<ClassTemplateSpecializationDecl>(RD)) {
997    // Create pointer type directly in this case.
998    const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
999    QualType PointeeTy = ThisPtrTy->getPointeeType();
1000    unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1001    uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1002    uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
1003    llvm::DIType PointeeType = getOrCreateType(PointeeTy, Unit);
1004    llvm::DIType ThisPtrType =
1005      DBuilder.createPointerType(PointeeType, Size, Align);
1006    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
1007    // TODO: This and the artificial type below are misleading, the
1008    // types aren't artificial the argument is, but the current
1009    // metadata doesn't represent that.
1010    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1011    Elts.push_back(ThisPtrType);
1012  } else {
1013    llvm::DIType ThisPtrType = getOrCreateType(ThisPtr, Unit);
1014    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
1015    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1016    Elts.push_back(ThisPtrType);
1017  }
1018
1019  // Copy rest of the arguments.
1020  for (unsigned i = 1, e = Args.getNumElements(); i != e; ++i)
1021    Elts.push_back(Args.getElement(i));
1022
1023  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
1024
1025  return DBuilder.createSubroutineType(Unit, EltTypeArray);
1026}
1027
1028/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1029/// inside a function.
1030static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1031  if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1032    return isFunctionLocalClass(NRD);
1033  if (isa<FunctionDecl>(RD->getDeclContext()))
1034    return true;
1035  return false;
1036}
1037
1038/// CreateCXXMemberFunction - A helper function to create a DISubprogram for
1039/// a single member function GlobalDecl.
1040llvm::DISubprogram
1041CGDebugInfo::CreateCXXMemberFunction(const CXXMethodDecl *Method,
1042                                     llvm::DIFile Unit,
1043                                     llvm::DIType RecordTy) {
1044  bool IsCtorOrDtor =
1045    isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1046
1047  StringRef MethodName = getFunctionName(Method);
1048  llvm::DICompositeType MethodTy = getOrCreateMethodType(Method, Unit);
1049
1050  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1051  // make sense to give a single ctor/dtor a linkage name.
1052  StringRef MethodLinkageName;
1053  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1054    MethodLinkageName = CGM.getMangledName(Method);
1055
1056  // Get the location for the method.
1057  llvm::DIFile MethodDefUnit = getOrCreateFile(Method->getLocation());
1058  unsigned MethodLine = getLineNumber(Method->getLocation());
1059
1060  // Collect virtual method info.
1061  llvm::DIType ContainingType;
1062  unsigned Virtuality = 0;
1063  unsigned VIndex = 0;
1064
1065  if (Method->isVirtual()) {
1066    if (Method->isPure())
1067      Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1068    else
1069      Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1070
1071    // It doesn't make sense to give a virtual destructor a vtable index,
1072    // since a single destructor has two entries in the vtable.
1073    if (!isa<CXXDestructorDecl>(Method))
1074      VIndex = CGM.getVTableContext().getMethodVTableIndex(Method);
1075    ContainingType = RecordTy;
1076  }
1077
1078  unsigned Flags = 0;
1079  if (Method->isImplicit())
1080    Flags |= llvm::DIDescriptor::FlagArtificial;
1081  AccessSpecifier Access = Method->getAccess();
1082  if (Access == clang::AS_private)
1083    Flags |= llvm::DIDescriptor::FlagPrivate;
1084  else if (Access == clang::AS_protected)
1085    Flags |= llvm::DIDescriptor::FlagProtected;
1086  if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1087    if (CXXC->isExplicit())
1088      Flags |= llvm::DIDescriptor::FlagExplicit;
1089  } else if (const CXXConversionDecl *CXXC =
1090             dyn_cast<CXXConversionDecl>(Method)) {
1091    if (CXXC->isExplicit())
1092      Flags |= llvm::DIDescriptor::FlagExplicit;
1093  }
1094  if (Method->hasPrototype())
1095    Flags |= llvm::DIDescriptor::FlagPrototyped;
1096
1097  llvm::DIArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1098  llvm::DISubprogram SP =
1099    DBuilder.createMethod(RecordTy, MethodName, MethodLinkageName,
1100                          MethodDefUnit, MethodLine,
1101                          MethodTy, /*isLocalToUnit=*/false,
1102                          /* isDefinition=*/ false,
1103                          Virtuality, VIndex, ContainingType,
1104                          Flags, CGM.getLangOpts().Optimize, NULL,
1105                          TParamsArray);
1106
1107  SPCache[Method->getCanonicalDecl()] = llvm::WeakVH(SP);
1108
1109  return SP;
1110}
1111
1112/// CollectCXXMemberFunctions - A helper function to collect debug info for
1113/// C++ member functions. This is used while creating debug info entry for
1114/// a Record.
1115void CGDebugInfo::
1116CollectCXXMemberFunctions(const CXXRecordDecl *RD, llvm::DIFile Unit,
1117                          SmallVectorImpl<llvm::Value *> &EltTys,
1118                          llvm::DIType RecordTy) {
1119
1120  // Since we want more than just the individual member decls if we
1121  // have templated functions iterate over every declaration to gather
1122  // the functions.
1123  for(DeclContext::decl_iterator I = RD->decls_begin(),
1124        E = RD->decls_end(); I != E; ++I) {
1125    Decl *D = *I;
1126    if (D->isImplicit() && !D->isUsed())
1127      continue;
1128
1129    if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1130      EltTys.push_back(CreateCXXMemberFunction(Method, Unit, RecordTy));
1131    else if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
1132      for (FunctionTemplateDecl::spec_iterator SI = FTD->spec_begin(),
1133             SE = FTD->spec_end(); SI != SE; ++SI)
1134        EltTys.push_back(CreateCXXMemberFunction(cast<CXXMethodDecl>(*SI), Unit,
1135                                                 RecordTy));
1136  }
1137}
1138
1139/// CollectCXXFriends - A helper function to collect debug info for
1140/// C++ base classes. This is used while creating debug info entry for
1141/// a Record.
1142void CGDebugInfo::
1143CollectCXXFriends(const CXXRecordDecl *RD, llvm::DIFile Unit,
1144                SmallVectorImpl<llvm::Value *> &EltTys,
1145                llvm::DIType RecordTy) {
1146  for (CXXRecordDecl::friend_iterator BI = RD->friend_begin(),
1147         BE = RD->friend_end(); BI != BE; ++BI) {
1148    if ((*BI)->isUnsupportedFriend())
1149      continue;
1150    if (TypeSourceInfo *TInfo = (*BI)->getFriendType())
1151      EltTys.push_back(DBuilder.createFriend(RecordTy,
1152                                             getOrCreateType(TInfo->getType(),
1153                                                             Unit)));
1154  }
1155}
1156
1157/// CollectCXXBases - A helper function to collect debug info for
1158/// C++ base classes. This is used while creating debug info entry for
1159/// a Record.
1160void CGDebugInfo::
1161CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile Unit,
1162                SmallVectorImpl<llvm::Value *> &EltTys,
1163                llvm::DIType RecordTy) {
1164
1165  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1166  for (CXXRecordDecl::base_class_const_iterator BI = RD->bases_begin(),
1167         BE = RD->bases_end(); BI != BE; ++BI) {
1168    unsigned BFlags = 0;
1169    uint64_t BaseOffset;
1170
1171    const CXXRecordDecl *Base =
1172      cast<CXXRecordDecl>(BI->getType()->getAs<RecordType>()->getDecl());
1173
1174    if (BI->isVirtual()) {
1175      // virtual base offset offset is -ve. The code generator emits dwarf
1176      // expression where it expects +ve number.
1177      BaseOffset =
1178        0 - CGM.getVTableContext()
1179               .getVirtualBaseOffsetOffset(RD, Base).getQuantity();
1180      BFlags = llvm::DIDescriptor::FlagVirtual;
1181    } else
1182      BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1183    // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1184    // BI->isVirtual() and bits when not.
1185
1186    AccessSpecifier Access = BI->getAccessSpecifier();
1187    if (Access == clang::AS_private)
1188      BFlags |= llvm::DIDescriptor::FlagPrivate;
1189    else if (Access == clang::AS_protected)
1190      BFlags |= llvm::DIDescriptor::FlagProtected;
1191
1192    llvm::DIType DTy =
1193      DBuilder.createInheritance(RecordTy,
1194                                 getOrCreateType(BI->getType(), Unit),
1195                                 BaseOffset, BFlags);
1196    EltTys.push_back(DTy);
1197  }
1198}
1199
1200/// CollectTemplateParams - A helper function to collect template parameters.
1201llvm::DIArray CGDebugInfo::
1202CollectTemplateParams(const TemplateParameterList *TPList,
1203                      ArrayRef<TemplateArgument> TAList,
1204                      llvm::DIFile Unit) {
1205  SmallVector<llvm::Value *, 16> TemplateParams;
1206  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1207    const TemplateArgument &TA = TAList[i];
1208    StringRef Name;
1209    if (TPList)
1210      Name = TPList->getParam(i)->getName();
1211    switch (TA.getKind()) {
1212    case TemplateArgument::Type: {
1213      llvm::DIType TTy = getOrCreateType(TA.getAsType(), Unit);
1214      llvm::DITemplateTypeParameter TTP =
1215          DBuilder.createTemplateTypeParameter(TheCU, Name, TTy);
1216      TemplateParams.push_back(TTP);
1217    } break;
1218    case TemplateArgument::Integral: {
1219      llvm::DIType TTy = getOrCreateType(TA.getIntegralType(), Unit);
1220      llvm::DITemplateValueParameter TVP =
1221          DBuilder.createTemplateValueParameter(
1222              TheCU, Name, TTy,
1223              llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral()));
1224      TemplateParams.push_back(TVP);
1225    } break;
1226    case TemplateArgument::Declaration: {
1227      const ValueDecl *D = TA.getAsDecl();
1228      bool InstanceMember = D->isCXXInstanceMember();
1229      QualType T = InstanceMember
1230                       ? CGM.getContext().getMemberPointerType(
1231                             D->getType(), cast<RecordDecl>(D->getDeclContext())
1232                                               ->getTypeForDecl())
1233                       : CGM.getContext().getPointerType(D->getType());
1234      llvm::DIType TTy = getOrCreateType(T, Unit);
1235      llvm::Value *V = 0;
1236      // Variable pointer template parameters have a value that is the address
1237      // of the variable.
1238      if (const VarDecl *VD = dyn_cast<VarDecl>(D))
1239        V = CGM.GetAddrOfGlobalVar(VD);
1240      // Member function pointers have special support for building them, though
1241      // this is currently unsupported in LLVM CodeGen.
1242      if (InstanceMember) {
1243        if (const CXXMethodDecl *method = dyn_cast<CXXMethodDecl>(D))
1244          V = CGM.getCXXABI().EmitMemberPointer(method);
1245      } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
1246        V = CGM.GetAddrOfFunction(FD);
1247      // Member data pointers have special handling too to compute the fixed
1248      // offset within the object.
1249      if (isa<FieldDecl>(D)) {
1250        // These five lines (& possibly the above member function pointer
1251        // handling) might be able to be refactored to use similar code in
1252        // CodeGenModule::getMemberPointerConstant
1253        uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1254        CharUnits chars =
1255            CGM.getContext().toCharUnitsFromBits((int64_t) fieldOffset);
1256        V = CGM.getCXXABI().EmitMemberDataPointer(
1257            cast<MemberPointerType>(T.getTypePtr()), chars);
1258      }
1259      llvm::DITemplateValueParameter TVP =
1260          DBuilder.createTemplateValueParameter(TheCU, Name, TTy, V);
1261      TemplateParams.push_back(TVP);
1262    } break;
1263    case TemplateArgument::NullPtr: {
1264      QualType T = TA.getNullPtrType();
1265      llvm::DIType TTy = getOrCreateType(T, Unit);
1266      llvm::Value *V = 0;
1267      // Special case member data pointer null values since they're actually -1
1268      // instead of zero.
1269      if (const MemberPointerType *MPT =
1270              dyn_cast<MemberPointerType>(T.getTypePtr()))
1271        // But treat member function pointers as simple zero integers because
1272        // it's easier than having a special case in LLVM's CodeGen. If LLVM
1273        // CodeGen grows handling for values of non-null member function
1274        // pointers then perhaps we could remove this special case and rely on
1275        // EmitNullMemberPointer for member function pointers.
1276        if (MPT->isMemberDataPointer())
1277          V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1278      if (!V)
1279        V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1280      llvm::DITemplateValueParameter TVP =
1281          DBuilder.createTemplateValueParameter(TheCU, Name, TTy, V);
1282      TemplateParams.push_back(TVP);
1283    } break;
1284    case TemplateArgument::Template: {
1285      llvm::DITemplateValueParameter TVP =
1286          DBuilder.createTemplateTemplateParameter(
1287              TheCU, Name, llvm::DIType(),
1288              TA.getAsTemplate().getAsTemplateDecl()
1289                  ->getQualifiedNameAsString());
1290      TemplateParams.push_back(TVP);
1291    } break;
1292    case TemplateArgument::Pack: {
1293      llvm::DITemplateValueParameter TVP =
1294          DBuilder.createTemplateParameterPack(
1295              TheCU, Name, llvm::DIType(),
1296              CollectTemplateParams(NULL, TA.getPackAsArray(), Unit));
1297      TemplateParams.push_back(TVP);
1298    } break;
1299    // And the following should never occur:
1300    case TemplateArgument::Expression:
1301    case TemplateArgument::TemplateExpansion:
1302    case TemplateArgument::Null:
1303      llvm_unreachable(
1304          "These argument types shouldn't exist in concrete types");
1305    }
1306  }
1307  return DBuilder.getOrCreateArray(TemplateParams);
1308}
1309
1310/// CollectFunctionTemplateParams - A helper function to collect debug
1311/// info for function template parameters.
1312llvm::DIArray CGDebugInfo::
1313CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit) {
1314  if (FD->getTemplatedKind() ==
1315      FunctionDecl::TK_FunctionTemplateSpecialization) {
1316    const TemplateParameterList *TList =
1317      FD->getTemplateSpecializationInfo()->getTemplate()
1318      ->getTemplateParameters();
1319    return CollectTemplateParams(
1320        TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1321  }
1322  return llvm::DIArray();
1323}
1324
1325/// CollectCXXTemplateParams - A helper function to collect debug info for
1326/// template parameters.
1327llvm::DIArray CGDebugInfo::
1328CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TSpecial,
1329                         llvm::DIFile Unit) {
1330  llvm::PointerUnion<ClassTemplateDecl *,
1331                     ClassTemplatePartialSpecializationDecl *>
1332    PU = TSpecial->getSpecializedTemplateOrPartial();
1333
1334  TemplateParameterList *TPList = PU.is<ClassTemplateDecl *>() ?
1335    PU.get<ClassTemplateDecl *>()->getTemplateParameters() :
1336    PU.get<ClassTemplatePartialSpecializationDecl *>()->getTemplateParameters();
1337  const TemplateArgumentList &TAList = TSpecial->getTemplateInstantiationArgs();
1338  return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1339}
1340
1341/// getOrCreateVTablePtrType - Return debug info descriptor for vtable.
1342llvm::DIType CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile Unit) {
1343  if (VTablePtrType.isValid())
1344    return VTablePtrType;
1345
1346  ASTContext &Context = CGM.getContext();
1347
1348  /* Function type */
1349  llvm::Value *STy = getOrCreateType(Context.IntTy, Unit);
1350  llvm::DIArray SElements = DBuilder.getOrCreateArray(STy);
1351  llvm::DIType SubTy = DBuilder.createSubroutineType(Unit, SElements);
1352  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1353  llvm::DIType vtbl_ptr_type = DBuilder.createPointerType(SubTy, Size, 0,
1354                                                          "__vtbl_ptr_type");
1355  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1356  return VTablePtrType;
1357}
1358
1359/// getVTableName - Get vtable name for the given Class.
1360StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1361  // Construct gdb compatible name name.
1362  std::string Name = "_vptr$" + RD->getNameAsString();
1363
1364  // Copy this name on the side and use its reference.
1365  char *StrPtr = DebugInfoNames.Allocate<char>(Name.length());
1366  memcpy(StrPtr, Name.data(), Name.length());
1367  return StringRef(StrPtr, Name.length());
1368}
1369
1370
1371/// CollectVTableInfo - If the C++ class has vtable info then insert appropriate
1372/// debug info entry in EltTys vector.
1373void CGDebugInfo::
1374CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile Unit,
1375                  SmallVectorImpl<llvm::Value *> &EltTys) {
1376  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1377
1378  // If there is a primary base then it will hold vtable info.
1379  if (RL.getPrimaryBase())
1380    return;
1381
1382  // If this class is not dynamic then there is not any vtable info to collect.
1383  if (!RD->isDynamicClass())
1384    return;
1385
1386  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1387  llvm::DIType VPTR
1388    = DBuilder.createMemberType(Unit, getVTableName(RD), Unit,
1389                                0, Size, 0, 0,
1390                                llvm::DIDescriptor::FlagArtificial,
1391                                getOrCreateVTablePtrType(Unit));
1392  EltTys.push_back(VPTR);
1393}
1394
1395/// getOrCreateRecordType - Emit record type's standalone debug info.
1396llvm::DIType CGDebugInfo::getOrCreateRecordType(QualType RTy,
1397                                                SourceLocation Loc) {
1398  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1399  llvm::DIType T = getOrCreateType(RTy, getOrCreateFile(Loc));
1400  return T;
1401}
1402
1403/// getOrCreateInterfaceType - Emit an objective c interface type standalone
1404/// debug info.
1405llvm::DIType CGDebugInfo::getOrCreateInterfaceType(QualType D,
1406                                                   SourceLocation Loc) {
1407  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
1408  llvm::DIType T = getOrCreateType(D, getOrCreateFile(Loc));
1409  RetainedTypes.push_back(D.getAsOpaquePtr());
1410  return T;
1411}
1412
1413/// CreateType - get structure or union type.
1414llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty, bool Declaration) {
1415  RecordDecl *RD = Ty->getDecl();
1416  // Limited debug info should only remove struct definitions that can
1417  // safely be replaced by a forward declaration in the source code.
1418  if (DebugKind <= CodeGenOptions::LimitedDebugInfo && Declaration &&
1419      !RD->isCompleteDefinitionRequired()) {
1420    // FIXME: This implementation is problematic; there are some test
1421    // cases where we violate the above principle, such as
1422    // test/CodeGen/debug-info-records.c .
1423    llvm::DIDescriptor FDContext =
1424      getContextDescriptor(cast<Decl>(RD->getDeclContext()));
1425    llvm::DIType RetTy = createRecordFwdDecl(RD, FDContext);
1426    TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = RetTy;
1427    return RetTy;
1428  }
1429
1430  // Get overall information about the record type for the debug info.
1431  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
1432
1433  // Records and classes and unions can all be recursive.  To handle them, we
1434  // first generate a debug descriptor for the struct as a forward declaration.
1435  // Then (if it is a definition) we go through and get debug info for all of
1436  // its members.  Finally, we create a descriptor for the complete type (which
1437  // may refer to the forward decl if the struct is recursive) and replace all
1438  // uses of the forward declaration with the final definition.
1439
1440  llvm::DICompositeType FwdDecl(
1441      getOrCreateLimitedType(QualType(Ty, 0), DefUnit));
1442  assert(FwdDecl.isCompositeType() &&
1443         "The debug type of a RecordType should be a llvm::DICompositeType");
1444
1445  if (FwdDecl.isForwardDecl())
1446    return FwdDecl;
1447
1448  // Push the struct on region stack.
1449  LexicalBlockStack.push_back(&*FwdDecl);
1450  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
1451
1452  // Add this to the completed-type cache while we're completing it recursively.
1453  CompletedTypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
1454
1455  // Convert all the elements.
1456  SmallVector<llvm::Value *, 16> EltTys;
1457
1458  // Note: The split of CXXDecl information here is intentional, the
1459  // gdb tests will depend on a certain ordering at printout. The debug
1460  // information offsets are still correct if we merge them all together
1461  // though.
1462  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1463  if (CXXDecl) {
1464    CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
1465    CollectVTableInfo(CXXDecl, DefUnit, EltTys);
1466  }
1467
1468  // Collect data fields (including static variables and any initializers).
1469  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
1470  llvm::DIArray TParamsArray;
1471  if (CXXDecl) {
1472    CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
1473    CollectCXXFriends(CXXDecl, DefUnit, EltTys, FwdDecl);
1474    if (const ClassTemplateSpecializationDecl *TSpecial
1475        = dyn_cast<ClassTemplateSpecializationDecl>(RD))
1476      TParamsArray = CollectCXXTemplateParams(TSpecial, DefUnit);
1477  }
1478
1479  LexicalBlockStack.pop_back();
1480  RegionMap.erase(Ty->getDecl());
1481
1482  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1483  FwdDecl.setTypeArray(Elements, TParamsArray);
1484
1485  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
1486  return FwdDecl;
1487}
1488
1489/// CreateType - get objective-c object type.
1490llvm::DIType CGDebugInfo::CreateType(const ObjCObjectType *Ty,
1491                                     llvm::DIFile Unit) {
1492  // Ignore protocols.
1493  return getOrCreateType(Ty->getBaseType(), Unit);
1494}
1495
1496
1497/// \return true if Getter has the default name for the property PD.
1498static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
1499                                 const ObjCMethodDecl *Getter) {
1500  assert(PD);
1501  if (!Getter)
1502    return true;
1503
1504  assert(Getter->getDeclName().isObjCZeroArgSelector());
1505  return PD->getName() ==
1506    Getter->getDeclName().getObjCSelector().getNameForSlot(0);
1507}
1508
1509/// \return true if Setter has the default name for the property PD.
1510static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
1511                                 const ObjCMethodDecl *Setter) {
1512  assert(PD);
1513  if (!Setter)
1514    return true;
1515
1516  assert(Setter->getDeclName().isObjCOneArgSelector());
1517  return SelectorTable::constructSetterName(PD->getName()) ==
1518    Setter->getDeclName().getObjCSelector().getNameForSlot(0);
1519}
1520
1521/// CreateType - get objective-c interface type.
1522llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
1523                                     llvm::DIFile Unit) {
1524  ObjCInterfaceDecl *ID = Ty->getDecl();
1525  if (!ID)
1526    return llvm::DIType();
1527
1528  // Get overall information about the record type for the debug info.
1529  llvm::DIFile DefUnit = getOrCreateFile(ID->getLocation());
1530  unsigned Line = getLineNumber(ID->getLocation());
1531  unsigned RuntimeLang = TheCU.getLanguage();
1532
1533  // If this is just a forward declaration return a special forward-declaration
1534  // debug type since we won't be able to lay out the entire type.
1535  ObjCInterfaceDecl *Def = ID->getDefinition();
1536  if (!Def) {
1537    llvm::DIType FwdDecl =
1538      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
1539                                 ID->getName(), TheCU, DefUnit, Line,
1540                                 RuntimeLang);
1541    return FwdDecl;
1542  }
1543
1544  ID = Def;
1545
1546  // Bit size, align and offset of the type.
1547  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1548  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1549
1550  unsigned Flags = 0;
1551  if (ID->getImplementation())
1552    Flags |= llvm::DIDescriptor::FlagObjcClassComplete;
1553
1554  llvm::DICompositeType RealDecl =
1555    DBuilder.createStructType(Unit, ID->getName(), DefUnit,
1556                              Line, Size, Align, Flags,
1557                              llvm::DIType(), llvm::DIArray(), RuntimeLang);
1558
1559  // Otherwise, insert it into the CompletedTypeCache so that recursive uses
1560  // will find it and we're emitting the complete type.
1561  QualType QualTy = QualType(Ty, 0);
1562  CompletedTypeCache[QualTy.getAsOpaquePtr()] = RealDecl;
1563
1564  // Push the struct on region stack.
1565  LexicalBlockStack.push_back(static_cast<llvm::MDNode*>(RealDecl));
1566  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
1567
1568  // Convert all the elements.
1569  SmallVector<llvm::Value *, 16> EltTys;
1570
1571  ObjCInterfaceDecl *SClass = ID->getSuperClass();
1572  if (SClass) {
1573    llvm::DIType SClassTy =
1574      getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
1575    if (!SClassTy.isValid())
1576      return llvm::DIType();
1577
1578    llvm::DIType InhTag =
1579      DBuilder.createInheritance(RealDecl, SClassTy, 0, 0);
1580    EltTys.push_back(InhTag);
1581  }
1582
1583  // Create entries for all of the properties.
1584  for (ObjCContainerDecl::prop_iterator I = ID->prop_begin(),
1585         E = ID->prop_end(); I != E; ++I) {
1586    const ObjCPropertyDecl *PD = *I;
1587    SourceLocation Loc = PD->getLocation();
1588    llvm::DIFile PUnit = getOrCreateFile(Loc);
1589    unsigned PLine = getLineNumber(Loc);
1590    ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1591    ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1592    llvm::MDNode *PropertyNode =
1593      DBuilder.createObjCProperty(PD->getName(),
1594                                  PUnit, PLine,
1595                                  hasDefaultGetterName(PD, Getter) ? "" :
1596                                  getSelectorName(PD->getGetterName()),
1597                                  hasDefaultSetterName(PD, Setter) ? "" :
1598                                  getSelectorName(PD->getSetterName()),
1599                                  PD->getPropertyAttributes(),
1600                                  getOrCreateType(PD->getType(), PUnit));
1601    EltTys.push_back(PropertyNode);
1602  }
1603
1604  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
1605  unsigned FieldNo = 0;
1606  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
1607       Field = Field->getNextIvar(), ++FieldNo) {
1608    llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
1609    if (!FieldTy.isValid())
1610      return llvm::DIType();
1611
1612    StringRef FieldName = Field->getName();
1613
1614    // Ignore unnamed fields.
1615    if (FieldName.empty())
1616      continue;
1617
1618    // Get the location for the field.
1619    llvm::DIFile FieldDefUnit = getOrCreateFile(Field->getLocation());
1620    unsigned FieldLine = getLineNumber(Field->getLocation());
1621    QualType FType = Field->getType();
1622    uint64_t FieldSize = 0;
1623    unsigned FieldAlign = 0;
1624
1625    if (!FType->isIncompleteArrayType()) {
1626
1627      // Bit size, align and offset of the type.
1628      FieldSize = Field->isBitField()
1629                      ? Field->getBitWidthValue(CGM.getContext())
1630                      : CGM.getContext().getTypeSize(FType);
1631      FieldAlign = CGM.getContext().getTypeAlign(FType);
1632    }
1633
1634    uint64_t FieldOffset;
1635    if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
1636      // We don't know the runtime offset of an ivar if we're using the
1637      // non-fragile ABI.  For bitfields, use the bit offset into the first
1638      // byte of storage of the bitfield.  For other fields, use zero.
1639      if (Field->isBitField()) {
1640        FieldOffset = CGM.getObjCRuntime().ComputeBitfieldBitOffset(
1641            CGM, ID, Field);
1642        FieldOffset %= CGM.getContext().getCharWidth();
1643      } else {
1644        FieldOffset = 0;
1645      }
1646    } else {
1647      FieldOffset = RL.getFieldOffset(FieldNo);
1648    }
1649
1650    unsigned Flags = 0;
1651    if (Field->getAccessControl() == ObjCIvarDecl::Protected)
1652      Flags = llvm::DIDescriptor::FlagProtected;
1653    else if (Field->getAccessControl() == ObjCIvarDecl::Private)
1654      Flags = llvm::DIDescriptor::FlagPrivate;
1655
1656    llvm::MDNode *PropertyNode = NULL;
1657    if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
1658      if (ObjCPropertyImplDecl *PImpD =
1659          ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
1660        if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
1661          SourceLocation Loc = PD->getLocation();
1662          llvm::DIFile PUnit = getOrCreateFile(Loc);
1663          unsigned PLine = getLineNumber(Loc);
1664          ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1665          ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1666          PropertyNode =
1667            DBuilder.createObjCProperty(PD->getName(),
1668                                        PUnit, PLine,
1669                                        hasDefaultGetterName(PD, Getter) ? "" :
1670                                        getSelectorName(PD->getGetterName()),
1671                                        hasDefaultSetterName(PD, Setter) ? "" :
1672                                        getSelectorName(PD->getSetterName()),
1673                                        PD->getPropertyAttributes(),
1674                                        getOrCreateType(PD->getType(), PUnit));
1675        }
1676      }
1677    }
1678    FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit,
1679                                      FieldLine, FieldSize, FieldAlign,
1680                                      FieldOffset, Flags, FieldTy,
1681                                      PropertyNode);
1682    EltTys.push_back(FieldTy);
1683  }
1684
1685  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1686  RealDecl.setTypeArray(Elements);
1687
1688  // If the implementation is not yet set, we do not want to mark it
1689  // as complete. An implementation may declare additional
1690  // private ivars that we would miss otherwise.
1691  if (ID->getImplementation() == 0)
1692    CompletedTypeCache.erase(QualTy.getAsOpaquePtr());
1693
1694  LexicalBlockStack.pop_back();
1695  return RealDecl;
1696}
1697
1698llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) {
1699  llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
1700  int64_t Count = Ty->getNumElements();
1701  if (Count == 0)
1702    // If number of elements are not known then this is an unbounded array.
1703    // Use Count == -1 to express such arrays.
1704    Count = -1;
1705
1706  llvm::Value *Subscript = DBuilder.getOrCreateSubrange(0, Count);
1707  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
1708
1709  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1710  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1711
1712  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
1713}
1714
1715llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
1716                                     llvm::DIFile Unit) {
1717  uint64_t Size;
1718  uint64_t Align;
1719
1720  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
1721  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
1722    Size = 0;
1723    Align =
1724      CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
1725  } else if (Ty->isIncompleteArrayType()) {
1726    Size = 0;
1727    if (Ty->getElementType()->isIncompleteType())
1728      Align = 0;
1729    else
1730      Align = CGM.getContext().getTypeAlign(Ty->getElementType());
1731  } else if (Ty->isIncompleteType()) {
1732    Size = 0;
1733    Align = 0;
1734  } else {
1735    // Size and align of the whole array, not the element type.
1736    Size = CGM.getContext().getTypeSize(Ty);
1737    Align = CGM.getContext().getTypeAlign(Ty);
1738  }
1739
1740  // Add the dimensions of the array.  FIXME: This loses CV qualifiers from
1741  // interior arrays, do we care?  Why aren't nested arrays represented the
1742  // obvious/recursive way?
1743  SmallVector<llvm::Value *, 8> Subscripts;
1744  QualType EltTy(Ty, 0);
1745  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
1746    // If the number of elements is known, then count is that number. Otherwise,
1747    // it's -1. This allows us to represent a subrange with an array of 0
1748    // elements, like this:
1749    //
1750    //   struct foo {
1751    //     int x[0];
1752    //   };
1753    int64_t Count = -1;         // Count == -1 is an unbounded array.
1754    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
1755      Count = CAT->getSize().getZExtValue();
1756
1757    // FIXME: Verify this is right for VLAs.
1758    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
1759    EltTy = Ty->getElementType();
1760  }
1761
1762  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
1763
1764  llvm::DIType DbgTy =
1765    DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
1766                             SubscriptArray);
1767  return DbgTy;
1768}
1769
1770llvm::DIType CGDebugInfo::CreateType(const LValueReferenceType *Ty,
1771                                     llvm::DIFile Unit) {
1772  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type,
1773                               Ty, Ty->getPointeeType(), Unit);
1774}
1775
1776llvm::DIType CGDebugInfo::CreateType(const RValueReferenceType *Ty,
1777                                     llvm::DIFile Unit) {
1778  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type,
1779                               Ty, Ty->getPointeeType(), Unit);
1780}
1781
1782llvm::DIType CGDebugInfo::CreateType(const MemberPointerType *Ty,
1783                                     llvm::DIFile U) {
1784  llvm::DIType ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
1785  if (!Ty->getPointeeType()->isFunctionType())
1786    return DBuilder.createMemberPointerType(
1787        getOrCreateTypeDeclaration(Ty->getPointeeType(), U), ClassType);
1788  return DBuilder.createMemberPointerType(getOrCreateInstanceMethodType(
1789      CGM.getContext().getPointerType(
1790          QualType(Ty->getClass(), Ty->getPointeeType().getCVRQualifiers())),
1791      Ty->getPointeeType()->getAs<FunctionProtoType>(), U),
1792                                          ClassType);
1793}
1794
1795llvm::DIType CGDebugInfo::CreateType(const AtomicType *Ty,
1796                                     llvm::DIFile U) {
1797  // Ignore the atomic wrapping
1798  // FIXME: What is the correct representation?
1799  return getOrCreateType(Ty->getValueType(), U);
1800}
1801
1802/// CreateEnumType - get enumeration type.
1803llvm::DIType CGDebugInfo::CreateEnumType(const EnumDecl *ED) {
1804  uint64_t Size = 0;
1805  uint64_t Align = 0;
1806  if (!ED->getTypeForDecl()->isIncompleteType()) {
1807    Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
1808    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
1809  }
1810
1811  // If this is just a forward declaration, construct an appropriately
1812  // marked node and just return it.
1813  if (!ED->getDefinition()) {
1814    llvm::DIDescriptor EDContext;
1815    EDContext = getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1816    llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1817    unsigned Line = getLineNumber(ED->getLocation());
1818    StringRef EDName = ED->getName();
1819    return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_enumeration_type,
1820                                      EDName, EDContext, DefUnit, Line, 0,
1821                                      Size, Align);
1822  }
1823
1824  // Create DIEnumerator elements for each enumerator.
1825  SmallVector<llvm::Value *, 16> Enumerators;
1826  ED = ED->getDefinition();
1827  for (EnumDecl::enumerator_iterator
1828         Enum = ED->enumerator_begin(), EnumEnd = ED->enumerator_end();
1829       Enum != EnumEnd; ++Enum) {
1830    Enumerators.push_back(
1831      DBuilder.createEnumerator(Enum->getName(),
1832                                Enum->getInitVal().getSExtValue()));
1833  }
1834
1835  // Return a CompositeType for the enum itself.
1836  llvm::DIArray EltArray = DBuilder.getOrCreateArray(Enumerators);
1837
1838  llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1839  unsigned Line = getLineNumber(ED->getLocation());
1840  llvm::DIDescriptor EnumContext =
1841    getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1842  llvm::DIType ClassTy = ED->isFixed() ?
1843    getOrCreateType(ED->getIntegerType(), DefUnit) : llvm::DIType();
1844  llvm::DIType DbgTy =
1845    DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit, Line,
1846                                   Size, Align, EltArray,
1847                                   ClassTy);
1848  return DbgTy;
1849}
1850
1851static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
1852  Qualifiers Quals;
1853  do {
1854    Quals += T.getLocalQualifiers();
1855    QualType LastT = T;
1856    switch (T->getTypeClass()) {
1857    default:
1858      return C.getQualifiedType(T.getTypePtr(), Quals);
1859    case Type::TemplateSpecialization:
1860      T = cast<TemplateSpecializationType>(T)->desugar();
1861      break;
1862    case Type::TypeOfExpr:
1863      T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
1864      break;
1865    case Type::TypeOf:
1866      T = cast<TypeOfType>(T)->getUnderlyingType();
1867      break;
1868    case Type::Decltype:
1869      T = cast<DecltypeType>(T)->getUnderlyingType();
1870      break;
1871    case Type::UnaryTransform:
1872      T = cast<UnaryTransformType>(T)->getUnderlyingType();
1873      break;
1874    case Type::Attributed:
1875      T = cast<AttributedType>(T)->getEquivalentType();
1876      break;
1877    case Type::Elaborated:
1878      T = cast<ElaboratedType>(T)->getNamedType();
1879      break;
1880    case Type::Paren:
1881      T = cast<ParenType>(T)->getInnerType();
1882      break;
1883    case Type::SubstTemplateTypeParm:
1884      T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
1885      break;
1886    case Type::Auto:
1887      QualType DT = cast<AutoType>(T)->getDeducedType();
1888      if (DT.isNull())
1889        return T;
1890      T = DT;
1891      break;
1892    }
1893
1894    assert(T != LastT && "Type unwrapping failed to unwrap!");
1895    (void)LastT;
1896  } while (true);
1897}
1898
1899/// getType - Get the type from the cache or return null type if it doesn't
1900/// exist.
1901llvm::DIType CGDebugInfo::getTypeOrNull(QualType Ty) {
1902
1903  // Unwrap the type as needed for debug information.
1904  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1905
1906  // Check for existing entry.
1907  if (Ty->getTypeClass() == Type::ObjCInterface) {
1908    llvm::Value *V = getCachedInterfaceTypeOrNull(Ty);
1909    if (V)
1910      return llvm::DIType(cast<llvm::MDNode>(V));
1911    else return llvm::DIType();
1912  }
1913
1914  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1915    TypeCache.find(Ty.getAsOpaquePtr());
1916  if (it != TypeCache.end()) {
1917    // Verify that the debug info still exists.
1918    if (llvm::Value *V = it->second)
1919      return llvm::DIType(cast<llvm::MDNode>(V));
1920  }
1921
1922  return llvm::DIType();
1923}
1924
1925/// getCompletedTypeOrNull - Get the type from the cache or return null if it
1926/// doesn't exist.
1927llvm::DIType CGDebugInfo::getCompletedTypeOrNull(QualType Ty) {
1928
1929  // Unwrap the type as needed for debug information.
1930  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1931
1932  // Check for existing entry.
1933  llvm::Value *V = 0;
1934  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1935    CompletedTypeCache.find(Ty.getAsOpaquePtr());
1936  if (it != CompletedTypeCache.end())
1937    V = it->second;
1938  else {
1939    V = getCachedInterfaceTypeOrNull(Ty);
1940  }
1941
1942  // Verify that any cached debug info still exists.
1943  if (V != 0)
1944    return llvm::DIType(cast<llvm::MDNode>(V));
1945
1946  return llvm::DIType();
1947}
1948
1949void CGDebugInfo::completeFwdDecl(const RecordDecl &RD) {
1950  // In limited debug info we only want to do this if the complete type was
1951  // required.
1952  if (DebugKind <= CodeGenOptions::LimitedDebugInfo)
1953    return;
1954
1955  QualType QTy = CGM.getContext().getRecordType(&RD);
1956  llvm::DIType T = getTypeOrNull(QTy);
1957
1958  if (T.isType() && T.isForwardDecl())
1959    getOrCreateType(QTy, getOrCreateFile(RD.getLocation()));
1960}
1961
1962/// getCachedInterfaceTypeOrNull - Get the type from the interface
1963/// cache, unless it needs to regenerated. Otherwise return null.
1964llvm::Value *CGDebugInfo::getCachedInterfaceTypeOrNull(QualType Ty) {
1965  // Is there a cached interface that hasn't changed?
1966  llvm::DenseMap<void *, std::pair<llvm::WeakVH, unsigned > >
1967    ::iterator it1 = ObjCInterfaceCache.find(Ty.getAsOpaquePtr());
1968
1969  if (it1 != ObjCInterfaceCache.end())
1970    if (ObjCInterfaceDecl* Decl = getObjCInterfaceDecl(Ty))
1971      if (Checksum(Decl) == it1->second.second)
1972        // Return cached forward declaration.
1973        return it1->second.first;
1974
1975  return 0;
1976}
1977
1978/// getOrCreateType - Get the type from the cache or create a new
1979/// one if necessary.
1980llvm::DIType CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile Unit,
1981                                          bool Declaration) {
1982  if (Ty.isNull())
1983    return llvm::DIType();
1984
1985  // Unwrap the type as needed for debug information.
1986  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1987
1988  llvm::DIType T = getCompletedTypeOrNull(Ty);
1989
1990  if (T.isType()) {
1991    // If we're looking for a definition, make sure we have definitions of any
1992    // underlying types.
1993    if (const TypedefType* TTy = dyn_cast<TypedefType>(Ty))
1994      getOrCreateType(TTy->getDecl()->getUnderlyingType(), Unit, Declaration);
1995    if (Ty.hasLocalQualifiers())
1996      getOrCreateType(QualType(Ty.getTypePtr(), 0), Unit, Declaration);
1997    return T;
1998  }
1999
2000  // Otherwise create the type.
2001  llvm::DIType Res = CreateTypeNode(Ty, Unit, Declaration);
2002  void* TyPtr = Ty.getAsOpaquePtr();
2003
2004  // And update the type cache.
2005  TypeCache[TyPtr] = Res;
2006
2007  llvm::DIType TC = getTypeOrNull(Ty);
2008  if (TC.isType() && TC.isForwardDecl())
2009    ReplaceMap.push_back(std::make_pair(TyPtr, static_cast<llvm::Value*>(TC)));
2010  else if (ObjCInterfaceDecl* Decl = getObjCInterfaceDecl(Ty)) {
2011    // Interface types may have elements added to them by a
2012    // subsequent implementation or extension, so we keep them in
2013    // the ObjCInterfaceCache together with a checksum. Instead of
2014    // the (possibly) incomplete interface type, we return a forward
2015    // declaration that gets RAUW'd in CGDebugInfo::finalize().
2016    std::pair<llvm::WeakVH, unsigned> &V = ObjCInterfaceCache[TyPtr];
2017    if (V.first)
2018      return llvm::DIType(cast<llvm::MDNode>(V.first));
2019    TC = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
2020                                    Decl->getName(), TheCU, Unit,
2021                                    getLineNumber(Decl->getLocation()),
2022                                    TheCU.getLanguage());
2023    // Store the forward declaration in the cache.
2024    V.first = TC;
2025    V.second = Checksum(Decl);
2026
2027    // Register the type for replacement in finalize().
2028    ReplaceMap.push_back(std::make_pair(TyPtr, static_cast<llvm::Value*>(TC)));
2029
2030    return TC;
2031  }
2032
2033  if (!Res.isForwardDecl())
2034    CompletedTypeCache[TyPtr] = Res;
2035
2036  return Res;
2037}
2038
2039/// Currently the checksum of an interface includes the number of
2040/// ivars and property accessors.
2041unsigned CGDebugInfo::Checksum(const ObjCInterfaceDecl *ID) {
2042  // The assumption is that the number of ivars can only increase
2043  // monotonically, so it is safe to just use their current number as
2044  // a checksum.
2045  unsigned Sum = 0;
2046  for (const ObjCIvarDecl *Ivar = ID->all_declared_ivar_begin();
2047       Ivar != 0; Ivar = Ivar->getNextIvar())
2048    ++Sum;
2049
2050  return Sum;
2051}
2052
2053ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {
2054  switch (Ty->getTypeClass()) {
2055  case Type::ObjCObjectPointer:
2056    return getObjCInterfaceDecl(cast<ObjCObjectPointerType>(Ty)
2057                                    ->getPointeeType());
2058  case Type::ObjCInterface:
2059    return cast<ObjCInterfaceType>(Ty)->getDecl();
2060  default:
2061    return 0;
2062  }
2063}
2064
2065/// CreateTypeNode - Create a new debug type node.
2066llvm::DIType CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile Unit,
2067                                         bool Declaration) {
2068  // Handle qualifiers, which recursively handles what they refer to.
2069  if (Ty.hasLocalQualifiers())
2070    return CreateQualifiedType(Ty, Unit, Declaration);
2071
2072  const char *Diag = 0;
2073
2074  // Work out details of type.
2075  switch (Ty->getTypeClass()) {
2076#define TYPE(Class, Base)
2077#define ABSTRACT_TYPE(Class, Base)
2078#define NON_CANONICAL_TYPE(Class, Base)
2079#define DEPENDENT_TYPE(Class, Base) case Type::Class:
2080#include "clang/AST/TypeNodes.def"
2081    llvm_unreachable("Dependent types cannot show up in debug information");
2082
2083  case Type::ExtVector:
2084  case Type::Vector:
2085    return CreateType(cast<VectorType>(Ty), Unit);
2086  case Type::ObjCObjectPointer:
2087    return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
2088  case Type::ObjCObject:
2089    return CreateType(cast<ObjCObjectType>(Ty), Unit);
2090  case Type::ObjCInterface:
2091    return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
2092  case Type::Builtin:
2093    return CreateType(cast<BuiltinType>(Ty));
2094  case Type::Complex:
2095    return CreateType(cast<ComplexType>(Ty));
2096  case Type::Pointer:
2097    return CreateType(cast<PointerType>(Ty), Unit);
2098  case Type::Decayed:
2099    // Decayed types are just pointers in LLVM and DWARF.
2100    return CreateType(
2101        cast<PointerType>(cast<DecayedType>(Ty)->getDecayedType()), Unit);
2102  case Type::BlockPointer:
2103    return CreateType(cast<BlockPointerType>(Ty), Unit);
2104  case Type::Typedef:
2105    return CreateType(cast<TypedefType>(Ty), Unit, Declaration);
2106  case Type::Record:
2107    return CreateType(cast<RecordType>(Ty), Declaration);
2108  case Type::Enum:
2109    return CreateEnumType(cast<EnumType>(Ty)->getDecl());
2110  case Type::FunctionProto:
2111  case Type::FunctionNoProto:
2112    return CreateType(cast<FunctionType>(Ty), Unit);
2113  case Type::ConstantArray:
2114  case Type::VariableArray:
2115  case Type::IncompleteArray:
2116    return CreateType(cast<ArrayType>(Ty), Unit);
2117
2118  case Type::LValueReference:
2119    return CreateType(cast<LValueReferenceType>(Ty), Unit);
2120  case Type::RValueReference:
2121    return CreateType(cast<RValueReferenceType>(Ty), Unit);
2122
2123  case Type::MemberPointer:
2124    return CreateType(cast<MemberPointerType>(Ty), Unit);
2125
2126  case Type::Atomic:
2127    return CreateType(cast<AtomicType>(Ty), Unit);
2128
2129  case Type::Attributed:
2130  case Type::TemplateSpecialization:
2131  case Type::Elaborated:
2132  case Type::Paren:
2133  case Type::SubstTemplateTypeParm:
2134  case Type::TypeOfExpr:
2135  case Type::TypeOf:
2136  case Type::Decltype:
2137  case Type::UnaryTransform:
2138  case Type::PackExpansion:
2139    llvm_unreachable("type should have been unwrapped!");
2140  case Type::Auto:
2141    Diag = "auto";
2142    break;
2143  }
2144
2145  assert(Diag && "Fall through without a diagnostic?");
2146  unsigned DiagID = CGM.getDiags().getCustomDiagID(DiagnosticsEngine::Error,
2147                               "debug information for %0 is not yet supported");
2148  CGM.getDiags().Report(DiagID)
2149    << Diag;
2150  return llvm::DIType();
2151}
2152
2153/// getOrCreateLimitedType - Get the type from the cache or create a new
2154/// limited type if necessary.
2155llvm::DIType CGDebugInfo::getOrCreateLimitedType(QualType Ty,
2156                                                 llvm::DIFile Unit) {
2157  if (Ty.isNull())
2158    return llvm::DIType();
2159
2160  // Unwrap the type as needed for debug information.
2161  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2162
2163  llvm::DIType T = getTypeOrNull(Ty);
2164
2165  // We may have cached a forward decl when we could have created
2166  // a non-forward decl. Go ahead and create a non-forward decl
2167  // now.
2168  if (T.isType() && !T.isForwardDecl()) return T;
2169
2170  // Otherwise create the type.
2171  llvm::DIType Res = CreateLimitedTypeNode(Ty, Unit);
2172
2173  if (T.isType() && T.isForwardDecl())
2174    ReplaceMap.push_back(std::make_pair(Ty.getAsOpaquePtr(),
2175                                        static_cast<llvm::Value*>(T)));
2176
2177  // And update the type cache.
2178  TypeCache[Ty.getAsOpaquePtr()] = Res;
2179  return Res;
2180}
2181
2182// TODO: Currently used for context chains when limiting debug info.
2183llvm::DIType CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
2184  RecordDecl *RD = Ty->getDecl();
2185
2186  // Get overall information about the record type for the debug info.
2187  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
2188  unsigned Line = getLineNumber(RD->getLocation());
2189  StringRef RDName = getClassName(RD);
2190
2191  llvm::DIDescriptor RDContext;
2192  if (DebugKind == CodeGenOptions::LimitedDebugInfo)
2193    RDContext = createContextChain(cast<Decl>(RD->getDeclContext()));
2194  else
2195    RDContext = getContextDescriptor(cast<Decl>(RD->getDeclContext()));
2196
2197  // If this is just a forward declaration, construct an appropriately
2198  // marked node and just return it.
2199  if (!RD->getDefinition())
2200    return createRecordFwdDecl(RD, RDContext);
2201
2202  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2203  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
2204  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2205  llvm::DICompositeType RealDecl;
2206
2207  if (RD->isUnion())
2208    RealDecl = DBuilder.createUnionType(RDContext, RDName, DefUnit, Line,
2209                                        Size, Align, 0, llvm::DIArray());
2210  else if (RD->isClass()) {
2211    // FIXME: This could be a struct type giving a default visibility different
2212    // than C++ class type, but needs llvm metadata changes first.
2213    RealDecl = DBuilder.createClassType(RDContext, RDName, DefUnit, Line,
2214                                        Size, Align, 0, 0, llvm::DIType(),
2215                                        llvm::DIArray(), llvm::DIType(),
2216                                        llvm::DIArray());
2217  } else
2218    RealDecl = DBuilder.createStructType(RDContext, RDName, DefUnit, Line,
2219                                         Size, Align, 0, llvm::DIType(),
2220                                         llvm::DIArray());
2221
2222  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
2223  TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = RealDecl;
2224
2225  if (CXXDecl) {
2226    // A class's primary base or the class itself contains the vtable.
2227    llvm::DICompositeType ContainingType;
2228    const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2229    if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
2230      // Seek non virtual primary base root.
2231      while (1) {
2232        const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
2233        const CXXRecordDecl *PBT = BRL.getPrimaryBase();
2234        if (PBT && !BRL.isPrimaryBaseVirtual())
2235          PBase = PBT;
2236        else
2237          break;
2238      }
2239      ContainingType = llvm::DICompositeType(
2240          getOrCreateType(QualType(PBase->getTypeForDecl(), 0), DefUnit));
2241    } else if (CXXDecl->isDynamicClass())
2242      ContainingType = RealDecl;
2243
2244    RealDecl.setContainingType(ContainingType);
2245  }
2246  return llvm::DIType(RealDecl);
2247}
2248
2249/// CreateLimitedTypeNode - Create a new debug type node, but only forward
2250/// declare composite types that haven't been processed yet.
2251llvm::DIType CGDebugInfo::CreateLimitedTypeNode(QualType Ty,llvm::DIFile Unit) {
2252
2253  // Work out details of type.
2254  switch (Ty->getTypeClass()) {
2255#define TYPE(Class, Base)
2256#define ABSTRACT_TYPE(Class, Base)
2257#define NON_CANONICAL_TYPE(Class, Base)
2258#define DEPENDENT_TYPE(Class, Base) case Type::Class:
2259        #include "clang/AST/TypeNodes.def"
2260    llvm_unreachable("Dependent types cannot show up in debug information");
2261
2262  case Type::Record:
2263    return CreateLimitedType(cast<RecordType>(Ty));
2264  default:
2265    return CreateTypeNode(Ty, Unit, false);
2266  }
2267}
2268
2269/// CreateMemberType - Create new member and increase Offset by FType's size.
2270llvm::DIType CGDebugInfo::CreateMemberType(llvm::DIFile Unit, QualType FType,
2271                                           StringRef Name,
2272                                           uint64_t *Offset) {
2273  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2274  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
2275  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
2276  llvm::DIType Ty = DBuilder.createMemberType(Unit, Name, Unit, 0,
2277                                              FieldSize, FieldAlign,
2278                                              *Offset, 0, FieldTy);
2279  *Offset += FieldSize;
2280  return Ty;
2281}
2282
2283llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
2284  // We only need a declaration (not a definition) of the type - so use whatever
2285  // we would otherwise do to get a type for a pointee. (forward declarations in
2286  // limited debug info, full definitions (if the type definition is available)
2287  // in unlimited debug info)
2288  if (const TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
2289    llvm::DIFile DefUnit = getOrCreateFile(TD->getLocation());
2290    return getOrCreateTypeDeclaration(CGM.getContext().getTypeDeclType(TD),
2291                                      DefUnit);
2292  }
2293  // Otherwise fall back to a fairly rudimentary cache of existing declarations.
2294  // This doesn't handle providing declarations (for functions or variables) for
2295  // entities without definitions in this TU, nor when the definition proceeds
2296  // the call to this function.
2297  // FIXME: This should be split out into more specific maps with support for
2298  // emitting forward declarations and merging definitions with declarations,
2299  // the same way as we do for types.
2300  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator I =
2301      DeclCache.find(D->getCanonicalDecl());
2302  if (I == DeclCache.end())
2303    return llvm::DIDescriptor();
2304  llvm::Value *V = I->second;
2305  return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
2306}
2307
2308/// getFunctionDeclaration - Return debug info descriptor to describe method
2309/// declaration for the given method definition.
2310llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
2311  if (!D || DebugKind == CodeGenOptions::DebugLineTablesOnly)
2312    return llvm::DISubprogram();
2313
2314  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
2315  if (!FD) return llvm::DISubprogram();
2316
2317  // Setup context.
2318  getContextDescriptor(cast<Decl>(D->getDeclContext()));
2319
2320  llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2321    MI = SPCache.find(FD->getCanonicalDecl());
2322  if (MI != SPCache.end()) {
2323    llvm::Value *V = MI->second;
2324    llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2325    if (SP.isSubprogram() && !SP.isDefinition())
2326      return SP;
2327  }
2328
2329  for (FunctionDecl::redecl_iterator I = FD->redecls_begin(),
2330         E = FD->redecls_end(); I != E; ++I) {
2331    const FunctionDecl *NextFD = *I;
2332    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2333      MI = SPCache.find(NextFD->getCanonicalDecl());
2334    if (MI != SPCache.end()) {
2335      llvm::Value *V = MI->second;
2336      llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2337      if (SP.isSubprogram() && !SP.isDefinition())
2338        return SP;
2339    }
2340  }
2341  return llvm::DISubprogram();
2342}
2343
2344// getOrCreateFunctionType - Construct DIType. If it is a c++ method, include
2345// implicit parameter "this".
2346llvm::DICompositeType CGDebugInfo::getOrCreateFunctionType(const Decl *D,
2347                                                           QualType FnType,
2348                                                           llvm::DIFile F) {
2349  if (!D || DebugKind == CodeGenOptions::DebugLineTablesOnly)
2350    // Create fake but valid subroutine type. Otherwise
2351    // llvm::DISubprogram::Verify() would return false, and
2352    // subprogram DIE will miss DW_AT_decl_file and
2353    // DW_AT_decl_line fields.
2354    return DBuilder.createSubroutineType(F, DBuilder.getOrCreateArray(None));
2355
2356  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
2357    return getOrCreateMethodType(Method, F);
2358  if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
2359    // Add "self" and "_cmd"
2360    SmallVector<llvm::Value *, 16> Elts;
2361
2362    // First element is always return type. For 'void' functions it is NULL.
2363    QualType ResultTy = OMethod->getResultType();
2364
2365    // Replace the instancetype keyword with the actual type.
2366    if (ResultTy == CGM.getContext().getObjCInstanceType())
2367      ResultTy = CGM.getContext().getPointerType(
2368        QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
2369
2370    Elts.push_back(getOrCreateType(ResultTy, F));
2371    // "self" pointer is always first argument.
2372    QualType SelfDeclTy = OMethod->getSelfDecl()->getType();
2373    llvm::DIType SelfTy = getOrCreateType(SelfDeclTy, F);
2374    Elts.push_back(CreateSelfType(SelfDeclTy, SelfTy));
2375    // "_cmd" pointer is always second argument.
2376    llvm::DIType CmdTy = getOrCreateType(OMethod->getCmdDecl()->getType(), F);
2377    Elts.push_back(DBuilder.createArtificialType(CmdTy));
2378    // Get rest of the arguments.
2379    for (ObjCMethodDecl::param_const_iterator PI = OMethod->param_begin(),
2380           PE = OMethod->param_end(); PI != PE; ++PI)
2381      Elts.push_back(getOrCreateType((*PI)->getType(), F));
2382
2383    llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
2384    return DBuilder.createSubroutineType(F, EltTypeArray);
2385  }
2386  return llvm::DICompositeType(getOrCreateType(FnType, F));
2387}
2388
2389/// EmitFunctionStart - Constructs the debug code for entering a function.
2390void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
2391                                    llvm::Function *Fn,
2392                                    CGBuilderTy &Builder) {
2393
2394  StringRef Name;
2395  StringRef LinkageName;
2396
2397  FnBeginRegionCount.push_back(LexicalBlockStack.size());
2398
2399  const Decl *D = GD.getDecl();
2400  // Function may lack declaration in source code if it is created by Clang
2401  // CodeGen (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk).
2402  bool HasDecl = (D != 0);
2403  // Use the location of the declaration.
2404  SourceLocation Loc;
2405  if (HasDecl)
2406    Loc = D->getLocation();
2407
2408  unsigned Flags = 0;
2409  llvm::DIFile Unit = getOrCreateFile(Loc);
2410  llvm::DIDescriptor FDContext(Unit);
2411  llvm::DIArray TParamsArray;
2412  if (!HasDecl) {
2413    // Use llvm function name.
2414    Name = Fn->getName();
2415  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2416    // If there is a DISubprogram for this function available then use it.
2417    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2418      FI = SPCache.find(FD->getCanonicalDecl());
2419    if (FI != SPCache.end()) {
2420      llvm::Value *V = FI->second;
2421      llvm::DIDescriptor SP(dyn_cast_or_null<llvm::MDNode>(V));
2422      if (SP.isSubprogram() && llvm::DISubprogram(SP).isDefinition()) {
2423        llvm::MDNode *SPN = SP;
2424        LexicalBlockStack.push_back(SPN);
2425        RegionMap[D] = llvm::WeakVH(SP);
2426        return;
2427      }
2428    }
2429    Name = getFunctionName(FD);
2430    // Use mangled name as linkage name for C/C++ functions.
2431    if (FD->hasPrototype()) {
2432      LinkageName = CGM.getMangledName(GD);
2433      Flags |= llvm::DIDescriptor::FlagPrototyped;
2434    }
2435    // No need to replicate the linkage name if it isn't different from the
2436    // subprogram name, no need to have it at all unless coverage is enabled or
2437    // debug is set to more than just line tables.
2438    if (LinkageName == Name ||
2439        (!CGM.getCodeGenOpts().EmitGcovArcs &&
2440         !CGM.getCodeGenOpts().EmitGcovNotes &&
2441         DebugKind <= CodeGenOptions::DebugLineTablesOnly))
2442      LinkageName = StringRef();
2443
2444    if (DebugKind >= CodeGenOptions::LimitedDebugInfo) {
2445      if (const NamespaceDecl *NSDecl =
2446          dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
2447        FDContext = getOrCreateNameSpace(NSDecl);
2448      else if (const RecordDecl *RDecl =
2449               dyn_cast_or_null<RecordDecl>(FD->getDeclContext()))
2450        FDContext = getContextDescriptor(cast<Decl>(RDecl->getDeclContext()));
2451
2452      // Collect template parameters.
2453      TParamsArray = CollectFunctionTemplateParams(FD, Unit);
2454    }
2455  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
2456    Name = getObjCMethodName(OMD);
2457    Flags |= llvm::DIDescriptor::FlagPrototyped;
2458  } else {
2459    // Use llvm function name.
2460    Name = Fn->getName();
2461    Flags |= llvm::DIDescriptor::FlagPrototyped;
2462  }
2463  if (!Name.empty() && Name[0] == '\01')
2464    Name = Name.substr(1);
2465
2466  unsigned LineNo = getLineNumber(Loc);
2467  if (!HasDecl || D->isImplicit())
2468    Flags |= llvm::DIDescriptor::FlagArtificial;
2469
2470  llvm::DISubprogram SP = DBuilder.createFunction(
2471      FDContext, Name, LinkageName, Unit, LineNo,
2472      getOrCreateFunctionType(D, FnType, Unit), Fn->hasInternalLinkage(),
2473      true /*definition*/, getLineNumber(CurLoc), Flags,
2474      CGM.getLangOpts().Optimize, Fn, TParamsArray, getFunctionDeclaration(D));
2475  if (HasDecl)
2476    DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(SP)));
2477
2478  // Push function on region stack.
2479  llvm::MDNode *SPN = SP;
2480  LexicalBlockStack.push_back(SPN);
2481  if (HasDecl)
2482    RegionMap[D] = llvm::WeakVH(SP);
2483}
2484
2485/// EmitLocation - Emit metadata to indicate a change in line/column
2486/// information in the source file. If the location is invalid, the
2487/// previous location will be reused.
2488void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc,
2489                               bool ForceColumnInfo) {
2490  // Update our current location
2491  setLocation(Loc);
2492
2493  if (CurLoc.isInvalid() || CurLoc.isMacroID()) return;
2494
2495  // Don't bother if things are the same as last time.
2496  SourceManager &SM = CGM.getContext().getSourceManager();
2497  if (CurLoc == PrevLoc ||
2498      SM.getExpansionLoc(CurLoc) == SM.getExpansionLoc(PrevLoc))
2499    // New Builder may not be in sync with CGDebugInfo.
2500    if (!Builder.getCurrentDebugLocation().isUnknown() &&
2501        Builder.getCurrentDebugLocation().getScope(CGM.getLLVMContext()) ==
2502          LexicalBlockStack.back())
2503      return;
2504
2505  // Update last state.
2506  PrevLoc = CurLoc;
2507
2508  llvm::MDNode *Scope = LexicalBlockStack.back();
2509  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get
2510                                  (getLineNumber(CurLoc),
2511                                   getColumnNumber(CurLoc, ForceColumnInfo),
2512                                   Scope));
2513}
2514
2515/// CreateLexicalBlock - Creates a new lexical block node and pushes it on
2516/// the stack.
2517void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
2518  llvm::DIDescriptor D =
2519    DBuilder.createLexicalBlock(LexicalBlockStack.empty() ?
2520                                llvm::DIDescriptor() :
2521                                llvm::DIDescriptor(LexicalBlockStack.back()),
2522                                getOrCreateFile(CurLoc),
2523                                getLineNumber(CurLoc),
2524                                getColumnNumber(CurLoc));
2525  llvm::MDNode *DN = D;
2526  LexicalBlockStack.push_back(DN);
2527}
2528
2529/// EmitLexicalBlockStart - Constructs the debug code for entering a declarative
2530/// region - beginning of a DW_TAG_lexical_block.
2531void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
2532                                        SourceLocation Loc) {
2533  // Set our current location.
2534  setLocation(Loc);
2535
2536  // Create a new lexical block and push it on the stack.
2537  CreateLexicalBlock(Loc);
2538
2539  // Emit a line table change for the current location inside the new scope.
2540  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(Loc),
2541                                  getColumnNumber(Loc),
2542                                  LexicalBlockStack.back()));
2543}
2544
2545/// EmitLexicalBlockEnd - Constructs the debug code for exiting a declarative
2546/// region - end of a DW_TAG_lexical_block.
2547void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
2548                                      SourceLocation Loc) {
2549  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2550
2551  // Provide an entry in the line table for the end of the block.
2552  EmitLocation(Builder, Loc);
2553
2554  LexicalBlockStack.pop_back();
2555}
2556
2557/// EmitFunctionEnd - Constructs the debug code for exiting a function.
2558void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
2559  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2560  unsigned RCount = FnBeginRegionCount.back();
2561  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
2562
2563  // Pop all regions for this function.
2564  while (LexicalBlockStack.size() != RCount)
2565    EmitLexicalBlockEnd(Builder, CurLoc);
2566  FnBeginRegionCount.pop_back();
2567}
2568
2569// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
2570// See BuildByRefType.
2571llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
2572                                                       uint64_t *XOffset) {
2573
2574  SmallVector<llvm::Value *, 5> EltTys;
2575  QualType FType;
2576  uint64_t FieldSize, FieldOffset;
2577  unsigned FieldAlign;
2578
2579  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2580  QualType Type = VD->getType();
2581
2582  FieldOffset = 0;
2583  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2584  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
2585  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
2586  FType = CGM.getContext().IntTy;
2587  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
2588  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
2589
2590  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
2591  if (HasCopyAndDispose) {
2592    FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2593    EltTys.push_back(CreateMemberType(Unit, FType, "__copy_helper",
2594                                      &FieldOffset));
2595    EltTys.push_back(CreateMemberType(Unit, FType, "__destroy_helper",
2596                                      &FieldOffset));
2597  }
2598  bool HasByrefExtendedLayout;
2599  Qualifiers::ObjCLifetime Lifetime;
2600  if (CGM.getContext().getByrefLifetime(Type,
2601                                        Lifetime, HasByrefExtendedLayout)
2602      && HasByrefExtendedLayout)
2603    EltTys.push_back(CreateMemberType(Unit, FType,
2604                                      "__byref_variable_layout",
2605                                      &FieldOffset));
2606
2607  CharUnits Align = CGM.getContext().getDeclAlign(VD);
2608  if (Align > CGM.getContext().toCharUnitsFromBits(
2609        CGM.getTarget().getPointerAlign(0))) {
2610    CharUnits FieldOffsetInBytes
2611      = CGM.getContext().toCharUnitsFromBits(FieldOffset);
2612    CharUnits AlignedOffsetInBytes
2613      = FieldOffsetInBytes.RoundUpToAlignment(Align);
2614    CharUnits NumPaddingBytes
2615      = AlignedOffsetInBytes - FieldOffsetInBytes;
2616
2617    if (NumPaddingBytes.isPositive()) {
2618      llvm::APInt pad(32, NumPaddingBytes.getQuantity());
2619      FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
2620                                                    pad, ArrayType::Normal, 0);
2621      EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
2622    }
2623  }
2624
2625  FType = Type;
2626  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2627  FieldSize = CGM.getContext().getTypeSize(FType);
2628  FieldAlign = CGM.getContext().toBits(Align);
2629
2630  *XOffset = FieldOffset;
2631  FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit,
2632                                      0, FieldSize, FieldAlign,
2633                                      FieldOffset, 0, FieldTy);
2634  EltTys.push_back(FieldTy);
2635  FieldOffset += FieldSize;
2636
2637  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
2638
2639  unsigned Flags = llvm::DIDescriptor::FlagBlockByrefStruct;
2640
2641  return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
2642                                   llvm::DIType(), Elements);
2643}
2644
2645/// EmitDeclare - Emit local variable declaration debug info.
2646void CGDebugInfo::EmitDeclare(const VarDecl *VD, unsigned Tag,
2647                              llvm::Value *Storage,
2648                              unsigned ArgNo, CGBuilderTy &Builder) {
2649  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2650  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2651
2652  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2653  llvm::DIType Ty;
2654  uint64_t XOffset = 0;
2655  if (VD->hasAttr<BlocksAttr>())
2656    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2657  else
2658    Ty = getOrCreateType(VD->getType(), Unit);
2659
2660  // If there is no debug info for this type then do not emit debug info
2661  // for this variable.
2662  if (!Ty)
2663    return;
2664
2665  // Get location information.
2666  unsigned Line = getLineNumber(VD->getLocation());
2667  unsigned Column = getColumnNumber(VD->getLocation());
2668  unsigned Flags = 0;
2669  if (VD->isImplicit())
2670    Flags |= llvm::DIDescriptor::FlagArtificial;
2671  // If this is the first argument and it is implicit then
2672  // give it an object pointer flag.
2673  // FIXME: There has to be a better way to do this, but for static
2674  // functions there won't be an implicit param at arg1 and
2675  // otherwise it is 'self' or 'this'.
2676  if (isa<ImplicitParamDecl>(VD) && ArgNo == 1)
2677    Flags |= llvm::DIDescriptor::FlagObjectPointer;
2678  if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage))
2679    if (Arg->getType()->isPointerTy() && !Arg->hasByValAttr() &&
2680        !VD->getType()->isPointerType())
2681      Flags |= llvm::DIDescriptor::FlagIndirectVariable;
2682
2683  llvm::MDNode *Scope = LexicalBlockStack.back();
2684
2685  StringRef Name = VD->getName();
2686  if (!Name.empty()) {
2687    if (VD->hasAttr<BlocksAttr>()) {
2688      CharUnits offset = CharUnits::fromQuantity(32);
2689      SmallVector<llvm::Value *, 9> addr;
2690      llvm::Type *Int64Ty = CGM.Int64Ty;
2691      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2692      // offset of __forwarding field
2693      offset = CGM.getContext().toCharUnitsFromBits(
2694        CGM.getTarget().getPointerWidth(0));
2695      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2696      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2697      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2698      // offset of x field
2699      offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2700      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2701
2702      // Create the descriptor for the variable.
2703      llvm::DIVariable D =
2704        DBuilder.createComplexVariable(Tag,
2705                                       llvm::DIDescriptor(Scope),
2706                                       VD->getName(), Unit, Line, Ty,
2707                                       addr, ArgNo);
2708
2709      // Insert an llvm.dbg.declare into the current block.
2710      llvm::Instruction *Call =
2711        DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2712      Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2713      return;
2714    }
2715  } else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
2716    // If VD is an anonymous union then Storage represents value for
2717    // all union fields.
2718    const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
2719    if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
2720      for (RecordDecl::field_iterator I = RD->field_begin(),
2721             E = RD->field_end();
2722           I != E; ++I) {
2723        FieldDecl *Field = *I;
2724        llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
2725        StringRef FieldName = Field->getName();
2726
2727        // Ignore unnamed fields. Do not ignore unnamed records.
2728        if (FieldName.empty() && !isa<RecordType>(Field->getType()))
2729          continue;
2730
2731        // Use VarDecl's Tag, Scope and Line number.
2732        llvm::DIVariable D =
2733          DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2734                                       FieldName, Unit, Line, FieldTy,
2735                                       CGM.getLangOpts().Optimize, Flags,
2736                                       ArgNo);
2737
2738        // Insert an llvm.dbg.declare into the current block.
2739        llvm::Instruction *Call =
2740          DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2741        Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2742      }
2743      return;
2744    }
2745  }
2746
2747  // Create the descriptor for the variable.
2748  llvm::DIVariable D =
2749    DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2750                                 Name, Unit, Line, Ty,
2751                                 CGM.getLangOpts().Optimize, Flags, ArgNo);
2752
2753  // Insert an llvm.dbg.declare into the current block.
2754  llvm::Instruction *Call =
2755    DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2756  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2757}
2758
2759void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
2760                                            llvm::Value *Storage,
2761                                            CGBuilderTy &Builder) {
2762  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2763  EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, 0, Builder);
2764}
2765
2766/// Look up the completed type for a self pointer in the TypeCache and
2767/// create a copy of it with the ObjectPointer and Artificial flags
2768/// set. If the type is not cached, a new one is created. This should
2769/// never happen though, since creating a type for the implicit self
2770/// argument implies that we already parsed the interface definition
2771/// and the ivar declarations in the implementation.
2772llvm::DIType CGDebugInfo::CreateSelfType(const QualType &QualTy,
2773                                         llvm::DIType Ty) {
2774  llvm::DIType CachedTy = getTypeOrNull(QualTy);
2775  if (CachedTy.isType()) Ty = CachedTy;
2776  else DEBUG(llvm::dbgs() << "No cached type for self.");
2777  return DBuilder.createObjectPointerType(Ty);
2778}
2779
2780void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(const VarDecl *VD,
2781                                                    llvm::Value *Storage,
2782                                                    CGBuilderTy &Builder,
2783                                                 const CGBlockInfo &blockInfo) {
2784  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2785  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2786
2787  if (Builder.GetInsertBlock() == 0)
2788    return;
2789
2790  bool isByRef = VD->hasAttr<BlocksAttr>();
2791
2792  uint64_t XOffset = 0;
2793  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2794  llvm::DIType Ty;
2795  if (isByRef)
2796    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2797  else
2798    Ty = getOrCreateType(VD->getType(), Unit);
2799
2800  // Self is passed along as an implicit non-arg variable in a
2801  // block. Mark it as the object pointer.
2802  if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
2803    Ty = CreateSelfType(VD->getType(), Ty);
2804
2805  // Get location information.
2806  unsigned Line = getLineNumber(VD->getLocation());
2807  unsigned Column = getColumnNumber(VD->getLocation());
2808
2809  const llvm::DataLayout &target = CGM.getDataLayout();
2810
2811  CharUnits offset = CharUnits::fromQuantity(
2812    target.getStructLayout(blockInfo.StructureType)
2813          ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
2814
2815  SmallVector<llvm::Value *, 9> addr;
2816  llvm::Type *Int64Ty = CGM.Int64Ty;
2817  if (isa<llvm::AllocaInst>(Storage))
2818    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2819  addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2820  addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2821  if (isByRef) {
2822    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2823    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2824    // offset of __forwarding field
2825    offset = CGM.getContext()
2826                .toCharUnitsFromBits(target.getPointerSizeInBits(0));
2827    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2828    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2829    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2830    // offset of x field
2831    offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2832    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2833  }
2834
2835  // Create the descriptor for the variable.
2836  llvm::DIVariable D =
2837    DBuilder.createComplexVariable(llvm::dwarf::DW_TAG_auto_variable,
2838                                   llvm::DIDescriptor(LexicalBlockStack.back()),
2839                                   VD->getName(), Unit, Line, Ty, addr);
2840
2841  // Insert an llvm.dbg.declare into the current block.
2842  llvm::Instruction *Call =
2843    DBuilder.insertDeclare(Storage, D, Builder.GetInsertPoint());
2844  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column,
2845                                        LexicalBlockStack.back()));
2846}
2847
2848/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
2849/// variable declaration.
2850void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
2851                                           unsigned ArgNo,
2852                                           CGBuilderTy &Builder) {
2853  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2854  EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, ArgNo, Builder);
2855}
2856
2857namespace {
2858  struct BlockLayoutChunk {
2859    uint64_t OffsetInBits;
2860    const BlockDecl::Capture *Capture;
2861  };
2862  bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
2863    return l.OffsetInBits < r.OffsetInBits;
2864  }
2865}
2866
2867void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
2868                                                       llvm::Value *Arg,
2869                                                       llvm::Value *LocalAddr,
2870                                                       CGBuilderTy &Builder) {
2871  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
2872  ASTContext &C = CGM.getContext();
2873  const BlockDecl *blockDecl = block.getBlockDecl();
2874
2875  // Collect some general information about the block's location.
2876  SourceLocation loc = blockDecl->getCaretLocation();
2877  llvm::DIFile tunit = getOrCreateFile(loc);
2878  unsigned line = getLineNumber(loc);
2879  unsigned column = getColumnNumber(loc);
2880
2881  // Build the debug-info type for the block literal.
2882  getContextDescriptor(cast<Decl>(blockDecl->getDeclContext()));
2883
2884  const llvm::StructLayout *blockLayout =
2885    CGM.getDataLayout().getStructLayout(block.StructureType);
2886
2887  SmallVector<llvm::Value*, 16> fields;
2888  fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
2889                                   blockLayout->getElementOffsetInBits(0),
2890                                   tunit, tunit));
2891  fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
2892                                   blockLayout->getElementOffsetInBits(1),
2893                                   tunit, tunit));
2894  fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
2895                                   blockLayout->getElementOffsetInBits(2),
2896                                   tunit, tunit));
2897  fields.push_back(createFieldType("__FuncPtr", C.VoidPtrTy, 0, loc, AS_public,
2898                                   blockLayout->getElementOffsetInBits(3),
2899                                   tunit, tunit));
2900  fields.push_back(createFieldType("__descriptor",
2901                                   C.getPointerType(block.NeedsCopyDispose ?
2902                                        C.getBlockDescriptorExtendedType() :
2903                                        C.getBlockDescriptorType()),
2904                                   0, loc, AS_public,
2905                                   blockLayout->getElementOffsetInBits(4),
2906                                   tunit, tunit));
2907
2908  // We want to sort the captures by offset, not because DWARF
2909  // requires this, but because we're paranoid about debuggers.
2910  SmallVector<BlockLayoutChunk, 8> chunks;
2911
2912  // 'this' capture.
2913  if (blockDecl->capturesCXXThis()) {
2914    BlockLayoutChunk chunk;
2915    chunk.OffsetInBits =
2916      blockLayout->getElementOffsetInBits(block.CXXThisIndex);
2917    chunk.Capture = 0;
2918    chunks.push_back(chunk);
2919  }
2920
2921  // Variable captures.
2922  for (BlockDecl::capture_const_iterator
2923         i = blockDecl->capture_begin(), e = blockDecl->capture_end();
2924       i != e; ++i) {
2925    const BlockDecl::Capture &capture = *i;
2926    const VarDecl *variable = capture.getVariable();
2927    const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
2928
2929    // Ignore constant captures.
2930    if (captureInfo.isConstant())
2931      continue;
2932
2933    BlockLayoutChunk chunk;
2934    chunk.OffsetInBits =
2935      blockLayout->getElementOffsetInBits(captureInfo.getIndex());
2936    chunk.Capture = &capture;
2937    chunks.push_back(chunk);
2938  }
2939
2940  // Sort by offset.
2941  llvm::array_pod_sort(chunks.begin(), chunks.end());
2942
2943  for (SmallVectorImpl<BlockLayoutChunk>::iterator
2944         i = chunks.begin(), e = chunks.end(); i != e; ++i) {
2945    uint64_t offsetInBits = i->OffsetInBits;
2946    const BlockDecl::Capture *capture = i->Capture;
2947
2948    // If we have a null capture, this must be the C++ 'this' capture.
2949    if (!capture) {
2950      const CXXMethodDecl *method =
2951        cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
2952      QualType type = method->getThisType(C);
2953
2954      fields.push_back(createFieldType("this", type, 0, loc, AS_public,
2955                                       offsetInBits, tunit, tunit));
2956      continue;
2957    }
2958
2959    const VarDecl *variable = capture->getVariable();
2960    StringRef name = variable->getName();
2961
2962    llvm::DIType fieldType;
2963    if (capture->isByRef()) {
2964      std::pair<uint64_t,unsigned> ptrInfo = C.getTypeInfo(C.VoidPtrTy);
2965
2966      // FIXME: this creates a second copy of this type!
2967      uint64_t xoffset;
2968      fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
2969      fieldType = DBuilder.createPointerType(fieldType, ptrInfo.first);
2970      fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
2971                                            ptrInfo.first, ptrInfo.second,
2972                                            offsetInBits, 0, fieldType);
2973    } else {
2974      fieldType = createFieldType(name, variable->getType(), 0,
2975                                  loc, AS_public, offsetInBits, tunit, tunit);
2976    }
2977    fields.push_back(fieldType);
2978  }
2979
2980  SmallString<36> typeName;
2981  llvm::raw_svector_ostream(typeName)
2982    << "__block_literal_" << CGM.getUniqueBlockCount();
2983
2984  llvm::DIArray fieldsArray = DBuilder.getOrCreateArray(fields);
2985
2986  llvm::DIType type =
2987    DBuilder.createStructType(tunit, typeName.str(), tunit, line,
2988                              CGM.getContext().toBits(block.BlockSize),
2989                              CGM.getContext().toBits(block.BlockAlign),
2990                              0, llvm::DIType(), fieldsArray);
2991  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
2992
2993  // Get overall information about the block.
2994  unsigned flags = llvm::DIDescriptor::FlagArtificial;
2995  llvm::MDNode *scope = LexicalBlockStack.back();
2996
2997  // Create the descriptor for the parameter.
2998  llvm::DIVariable debugVar =
2999    DBuilder.createLocalVariable(llvm::dwarf::DW_TAG_arg_variable,
3000                                 llvm::DIDescriptor(scope),
3001                                 Arg->getName(), tunit, line, type,
3002                                 CGM.getLangOpts().Optimize, flags,
3003                                 cast<llvm::Argument>(Arg)->getArgNo() + 1);
3004
3005  if (LocalAddr) {
3006    // Insert an llvm.dbg.value into the current block.
3007    llvm::Instruction *DbgVal =
3008      DBuilder.insertDbgValueIntrinsic(LocalAddr, 0, debugVar,
3009                                       Builder.GetInsertBlock());
3010    DbgVal->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
3011  }
3012
3013  // Insert an llvm.dbg.declare into the current block.
3014  llvm::Instruction *DbgDecl =
3015    DBuilder.insertDeclare(Arg, debugVar, Builder.GetInsertBlock());
3016  DbgDecl->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
3017}
3018
3019/// getStaticDataMemberDeclaration - If D is an out-of-class definition of
3020/// a static data member of a class, find its corresponding in-class
3021/// declaration.
3022llvm::DIDerivedType CGDebugInfo::getStaticDataMemberDeclaration(const Decl *D) {
3023  if (cast<VarDecl>(D)->isStaticDataMember()) {
3024    llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
3025      MI = StaticDataMemberCache.find(D->getCanonicalDecl());
3026    if (MI != StaticDataMemberCache.end())
3027      // Verify the info still exists.
3028      if (llvm::Value *V = MI->second)
3029        return llvm::DIDerivedType(cast<llvm::MDNode>(V));
3030  }
3031  return llvm::DIDerivedType();
3032}
3033
3034/// EmitGlobalVariable - Emit information about a global variable.
3035void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
3036                                     const VarDecl *D) {
3037  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3038  // Create global variable debug descriptor.
3039  llvm::DIFile Unit = getOrCreateFile(D->getLocation());
3040  unsigned LineNo = getLineNumber(D->getLocation());
3041
3042  setLocation(D->getLocation());
3043
3044  QualType T = D->getType();
3045  if (T->isIncompleteArrayType()) {
3046
3047    // CodeGen turns int[] into int[1] so we'll do the same here.
3048    llvm::APInt ConstVal(32, 1);
3049    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3050
3051    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
3052                                              ArrayType::Normal, 0);
3053  }
3054  StringRef DeclName = D->getName();
3055  StringRef LinkageName;
3056  if (D->getDeclContext() && !isa<FunctionDecl>(D->getDeclContext())
3057      && !isa<ObjCMethodDecl>(D->getDeclContext()))
3058    LinkageName = Var->getName();
3059  if (LinkageName == DeclName)
3060    LinkageName = StringRef();
3061  llvm::DIDescriptor DContext =
3062    getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()));
3063  llvm::DIGlobalVariable GV =
3064      DBuilder.createStaticVariable(DContext, DeclName, LinkageName, Unit,
3065                                    LineNo, getOrCreateType(T, Unit),
3066                                    Var->hasInternalLinkage(), Var,
3067                                    getStaticDataMemberDeclaration(D));
3068  DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(GV)));
3069}
3070
3071/// EmitGlobalVariable - Emit information about an objective-c interface.
3072void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
3073                                     ObjCInterfaceDecl *ID) {
3074  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3075  // Create global variable debug descriptor.
3076  llvm::DIFile Unit = getOrCreateFile(ID->getLocation());
3077  unsigned LineNo = getLineNumber(ID->getLocation());
3078
3079  StringRef Name = ID->getName();
3080
3081  QualType T = CGM.getContext().getObjCInterfaceType(ID);
3082  if (T->isIncompleteArrayType()) {
3083
3084    // CodeGen turns int[] into int[1] so we'll do the same here.
3085    llvm::APInt ConstVal(32, 1);
3086    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3087
3088    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
3089                                           ArrayType::Normal, 0);
3090  }
3091
3092  DBuilder.createGlobalVariable(Name, Unit, LineNo,
3093                                getOrCreateType(T, Unit),
3094                                Var->hasInternalLinkage(), Var);
3095}
3096
3097/// EmitGlobalVariable - Emit global variable's debug info.
3098void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
3099                                     llvm::Constant *Init) {
3100  assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
3101  // Create the descriptor for the variable.
3102  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
3103  StringRef Name = VD->getName();
3104  llvm::DIType Ty = getOrCreateType(VD->getType(), Unit);
3105  if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
3106    const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
3107    assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
3108    Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
3109  }
3110  // Do not use DIGlobalVariable for enums.
3111  if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
3112    return;
3113  llvm::DIGlobalVariable GV =
3114      DBuilder.createStaticVariable(Unit, Name, Name, Unit,
3115                                    getLineNumber(VD->getLocation()), Ty, true,
3116                                    Init, getStaticDataMemberDeclaration(VD));
3117  DeclCache.insert(std::make_pair(VD->getCanonicalDecl(), llvm::WeakVH(GV)));
3118}
3119
3120llvm::DIScope CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
3121  if (!LexicalBlockStack.empty())
3122    return llvm::DIScope(LexicalBlockStack.back());
3123  return getContextDescriptor(D);
3124}
3125
3126void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
3127  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3128    return;
3129  DBuilder.createImportedModule(
3130      getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
3131      getOrCreateNameSpace(UD.getNominatedNamespace()),
3132      getLineNumber(UD.getLocation()));
3133}
3134
3135void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
3136  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3137    return;
3138  assert(UD.shadow_size() &&
3139         "We shouldn't be codegening an invalid UsingDecl containing no decls");
3140  // Emitting one decl is sufficient - debuggers can detect that this is an
3141  // overloaded name & provide lookup for all the overloads.
3142  const UsingShadowDecl &USD = **UD.shadow_begin();
3143  if (llvm::DIDescriptor Target =
3144          getDeclarationOrDefinition(USD.getUnderlyingDecl()))
3145    DBuilder.createImportedDeclaration(
3146        getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
3147        getLineNumber(USD.getLocation()));
3148}
3149
3150llvm::DIImportedEntity
3151CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
3152  if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
3153    return llvm::DIImportedEntity(0);
3154  llvm::WeakVH &VH = NamespaceAliasCache[&NA];
3155  if (VH)
3156    return llvm::DIImportedEntity(cast<llvm::MDNode>(VH));
3157  llvm::DIImportedEntity R(0);
3158  if (const NamespaceAliasDecl *Underlying =
3159          dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
3160    // This could cache & dedup here rather than relying on metadata deduping.
3161    R = DBuilder.createImportedModule(
3162        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3163        EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
3164        NA.getName());
3165  else
3166    R = DBuilder.createImportedModule(
3167        getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
3168        getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
3169        getLineNumber(NA.getLocation()), NA.getName());
3170  VH = R;
3171  return R;
3172}
3173
3174/// getOrCreateNamesSpace - Return namespace descriptor for the given
3175/// namespace decl.
3176llvm::DINameSpace
3177CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
3178  llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH>::iterator I =
3179    NameSpaceCache.find(NSDecl);
3180  if (I != NameSpaceCache.end())
3181    return llvm::DINameSpace(cast<llvm::MDNode>(I->second));
3182
3183  unsigned LineNo = getLineNumber(NSDecl->getLocation());
3184  llvm::DIFile FileD = getOrCreateFile(NSDecl->getLocation());
3185  llvm::DIDescriptor Context =
3186    getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()));
3187  llvm::DINameSpace NS =
3188    DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
3189  NameSpaceCache[NSDecl] = llvm::WeakVH(NS);
3190  return NS;
3191}
3192
3193void CGDebugInfo::finalize() {
3194  for (std::vector<std::pair<void *, llvm::WeakVH> >::const_iterator VI
3195         = ReplaceMap.begin(), VE = ReplaceMap.end(); VI != VE; ++VI) {
3196    llvm::DIType Ty, RepTy;
3197    // Verify that the debug info still exists.
3198    if (llvm::Value *V = VI->second)
3199      Ty = llvm::DIType(cast<llvm::MDNode>(V));
3200
3201    llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
3202      TypeCache.find(VI->first);
3203    if (it != TypeCache.end()) {
3204      // Verify that the debug info still exists.
3205      if (llvm::Value *V = it->second)
3206        RepTy = llvm::DIType(cast<llvm::MDNode>(V));
3207    }
3208
3209    if (Ty.isType() && Ty.isForwardDecl() && RepTy.isType())
3210      Ty.replaceAllUsesWith(RepTy);
3211  }
3212
3213  // We keep our own list of retained types, because we need to look
3214  // up the final type in the type cache.
3215  for (std::vector<void *>::const_iterator RI = RetainedTypes.begin(),
3216         RE = RetainedTypes.end(); RI != RE; ++RI)
3217    DBuilder.retainType(llvm::DIType(cast<llvm::MDNode>(TypeCache[*RI])));
3218
3219  DBuilder.finalize();
3220}
3221