CGDebugInfo.cpp revision 58c79037256c77ffdbaa0da12205777e239fe096 
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 "CGObjCRuntime.h"
17#include "CodeGenFunction.h"
18#include "CodeGenModule.h"
19#include "clang/AST/ASTContext.h"
20#include "clang/AST/DeclFriend.h"
21#include "clang/AST/DeclObjC.h"
22#include "clang/AST/DeclTemplate.h"
23#include "clang/AST/Expr.h"
24#include "clang/AST/RecordLayout.h"
25#include "clang/Basic/FileManager.h"
26#include "clang/Basic/SourceManager.h"
27#include "clang/Basic/Version.h"
28#include "clang/Frontend/CodeGenOptions.h"
29#include "llvm/ADT/SmallVector.h"
30#include "llvm/ADT/StringExtras.h"
31#include "llvm/IR/Constants.h"
32#include "llvm/IR/DataLayout.h"
33#include "llvm/IR/DerivedTypes.h"
34#include "llvm/IR/Instructions.h"
35#include "llvm/IR/Intrinsics.h"
36#include "llvm/IR/Module.h"
37#include "llvm/Support/Dwarf.h"
38#include "llvm/Support/FileSystem.h"
39using namespace clang;
40using namespace clang::CodeGen;
41
42CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
43  : CGM(CGM), DBuilder(CGM.getModule()),
44    BlockLiteralGenericSet(false) {
45  CreateCompileUnit();
46}
47
48CGDebugInfo::~CGDebugInfo() {
49  assert(LexicalBlockStack.empty() &&
50         "Region stack mismatch, stack not empty!");
51}
52
53void CGDebugInfo::setLocation(SourceLocation Loc) {
54  // If the new location isn't valid return.
55  if (!Loc.isValid()) return;
56
57  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
58
59  // If we've changed files in the middle of a lexical scope go ahead
60  // and create a new lexical scope with file node if it's different
61  // from the one in the scope.
62  if (LexicalBlockStack.empty()) return;
63
64  SourceManager &SM = CGM.getContext().getSourceManager();
65  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
66  PresumedLoc PPLoc = SM.getPresumedLoc(PrevLoc);
67
68  if (PCLoc.isInvalid() || PPLoc.isInvalid() ||
69      !strcmp(PPLoc.getFilename(), PCLoc.getFilename()))
70    return;
71
72  llvm::MDNode *LB = LexicalBlockStack.back();
73  llvm::DIScope Scope = llvm::DIScope(LB);
74  if (Scope.isLexicalBlockFile()) {
75    llvm::DILexicalBlockFile LBF = llvm::DILexicalBlockFile(LB);
76    llvm::DIDescriptor D
77      = DBuilder.createLexicalBlockFile(LBF.getScope(),
78                                        getOrCreateFile(CurLoc));
79    llvm::MDNode *N = D;
80    LexicalBlockStack.pop_back();
81    LexicalBlockStack.push_back(N);
82  } else if (Scope.isLexicalBlock() || Scope.isSubprogram()) {
83    llvm::DIDescriptor D
84      = DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc));
85    llvm::MDNode *N = D;
86    LexicalBlockStack.pop_back();
87    LexicalBlockStack.push_back(N);
88  }
89}
90
91/// getContextDescriptor - Get context info for the decl.
92llvm::DIDescriptor CGDebugInfo::getContextDescriptor(const Decl *Context) {
93  if (!Context)
94    return TheCU;
95
96  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
97    I = RegionMap.find(Context);
98  if (I != RegionMap.end()) {
99    llvm::Value *V = I->second;
100    return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
101  }
102
103  // Check namespace.
104  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
105    return llvm::DIDescriptor(getOrCreateNameSpace(NSDecl));
106
107  if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context)) {
108    if (!RDecl->isDependentType()) {
109      llvm::DIType Ty = getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
110                                        getOrCreateMainFile());
111      return llvm::DIDescriptor(Ty);
112    }
113  }
114  return TheCU;
115}
116
117/// getFunctionName - Get function name for the given FunctionDecl. If the
118/// name is constructred on demand (e.g. C++ destructor) then the name
119/// is stored on the side.
120StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
121  assert (FD && "Invalid FunctionDecl!");
122  IdentifierInfo *FII = FD->getIdentifier();
123  FunctionTemplateSpecializationInfo *Info
124    = FD->getTemplateSpecializationInfo();
125  if (!Info && FII)
126    return FII->getName();
127
128  // Otherwise construct human readable name for debug info.
129  SmallString<128> NS;
130  llvm::raw_svector_ostream OS(NS);
131  FD->printName(OS);
132
133  // Add any template specialization args.
134  if (Info) {
135    const TemplateArgumentList *TArgs = Info->TemplateArguments;
136    const TemplateArgument *Args = TArgs->data();
137    unsigned NumArgs = TArgs->size();
138    PrintingPolicy Policy(CGM.getLangOpts());
139    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
140                                                          Policy);
141  }
142
143  // Copy this name on the side and use its reference.
144  OS.flush();
145  char *StrPtr = DebugInfoNames.Allocate<char>(NS.size());
146  memcpy(StrPtr, NS.data(), NS.size());
147  return StringRef(StrPtr, NS.size());
148}
149
150StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
151  SmallString<256> MethodName;
152  llvm::raw_svector_ostream OS(MethodName);
153  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
154  const DeclContext *DC = OMD->getDeclContext();
155  if (const ObjCImplementationDecl *OID =
156      dyn_cast<const ObjCImplementationDecl>(DC)) {
157     OS << OID->getName();
158  } else if (const ObjCInterfaceDecl *OID =
159             dyn_cast<const ObjCInterfaceDecl>(DC)) {
160      OS << OID->getName();
161  } else if (const ObjCCategoryImplDecl *OCD =
162             dyn_cast<const ObjCCategoryImplDecl>(DC)){
163      OS << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '(' <<
164          OCD->getIdentifier()->getNameStart() << ')';
165  }
166  OS << ' ' << OMD->getSelector().getAsString() << ']';
167
168  char *StrPtr = DebugInfoNames.Allocate<char>(OS.tell());
169  memcpy(StrPtr, MethodName.begin(), OS.tell());
170  return StringRef(StrPtr, OS.tell());
171}
172
173/// getSelectorName - Return selector name. This is used for debugging
174/// info.
175StringRef CGDebugInfo::getSelectorName(Selector S) {
176  const std::string &SName = S.getAsString();
177  char *StrPtr = DebugInfoNames.Allocate<char>(SName.size());
178  memcpy(StrPtr, SName.data(), SName.size());
179  return StringRef(StrPtr, SName.size());
180}
181
182/// getClassName - Get class name including template argument list.
183StringRef
184CGDebugInfo::getClassName(const RecordDecl *RD) {
185  const ClassTemplateSpecializationDecl *Spec
186    = dyn_cast<ClassTemplateSpecializationDecl>(RD);
187  if (!Spec)
188    return RD->getName();
189
190  const TemplateArgument *Args;
191  unsigned NumArgs;
192  if (TypeSourceInfo *TAW = Spec->getTypeAsWritten()) {
193    const TemplateSpecializationType *TST =
194      cast<TemplateSpecializationType>(TAW->getType());
195    Args = TST->getArgs();
196    NumArgs = TST->getNumArgs();
197  } else {
198    const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
199    Args = TemplateArgs.data();
200    NumArgs = TemplateArgs.size();
201  }
202  StringRef Name = RD->getIdentifier()->getName();
203  PrintingPolicy Policy(CGM.getLangOpts());
204  SmallString<128> TemplateArgList;
205  {
206    llvm::raw_svector_ostream OS(TemplateArgList);
207    TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
208                                                          Policy);
209  }
210
211  // Copy this name on the side and use its reference.
212  size_t Length = Name.size() + TemplateArgList.size();
213  char *StrPtr = DebugInfoNames.Allocate<char>(Length);
214  memcpy(StrPtr, Name.data(), Name.size());
215  memcpy(StrPtr + Name.size(), TemplateArgList.data(), TemplateArgList.size());
216  return StringRef(StrPtr, Length);
217}
218
219/// getOrCreateFile - Get the file debug info descriptor for the input location.
220llvm::DIFile CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
221  if (!Loc.isValid())
222    // If Location is not valid then use main input file.
223    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
224
225  SourceManager &SM = CGM.getContext().getSourceManager();
226  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
227
228  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
229    // If the location is not valid then use main input file.
230    return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
231
232  // Cache the results.
233  const char *fname = PLoc.getFilename();
234  llvm::DenseMap<const char *, llvm::WeakVH>::iterator it =
235    DIFileCache.find(fname);
236
237  if (it != DIFileCache.end()) {
238    // Verify that the information still exists.
239    if (llvm::Value *V = it->second)
240      return llvm::DIFile(cast<llvm::MDNode>(V));
241  }
242
243  llvm::DIFile F = DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
244
245  DIFileCache[fname] = F;
246  return F;
247}
248
249/// getOrCreateMainFile - Get the file info for main compile unit.
250llvm::DIFile CGDebugInfo::getOrCreateMainFile() {
251  return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
252}
253
254/// getLineNumber - Get line number for the location. If location is invalid
255/// then use current location.
256unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
257  if (Loc.isInvalid() && CurLoc.isInvalid())
258    return 0;
259  SourceManager &SM = CGM.getContext().getSourceManager();
260  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
261  return PLoc.isValid()? PLoc.getLine() : 0;
262}
263
264/// getColumnNumber - Get column number for the location.
265unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc) {
266  // We may not want column information at all.
267  if (!CGM.getCodeGenOpts().DebugColumnInfo)
268    return 0;
269
270  // If the location is invalid then use the current column.
271  if (Loc.isInvalid() && CurLoc.isInvalid())
272    return 0;
273  SourceManager &SM = CGM.getContext().getSourceManager();
274  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
275  return PLoc.isValid()? PLoc.getColumn() : 0;
276}
277
278StringRef CGDebugInfo::getCurrentDirname() {
279  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
280    return CGM.getCodeGenOpts().DebugCompilationDir;
281
282  if (!CWDName.empty())
283    return CWDName;
284  SmallString<256> CWD;
285  llvm::sys::fs::current_path(CWD);
286  char *CompDirnamePtr = DebugInfoNames.Allocate<char>(CWD.size());
287  memcpy(CompDirnamePtr, CWD.data(), CWD.size());
288  return CWDName = StringRef(CompDirnamePtr, CWD.size());
289}
290
291/// CreateCompileUnit - Create new compile unit.
292void CGDebugInfo::CreateCompileUnit() {
293
294  // Get absolute path name.
295  SourceManager &SM = CGM.getContext().getSourceManager();
296  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
297  if (MainFileName.empty())
298    MainFileName = "<unknown>";
299
300  // The main file name provided via the "-main-file-name" option contains just
301  // the file name itself with no path information. This file name may have had
302  // a relative path, so we look into the actual file entry for the main
303  // file to determine the real absolute path for the file.
304  std::string MainFileDir;
305  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
306    MainFileDir = MainFile->getDir()->getName();
307    if (MainFileDir != ".")
308      MainFileName = MainFileDir + "/" + MainFileName;
309  }
310
311  // Save filename string.
312  char *FilenamePtr = DebugInfoNames.Allocate<char>(MainFileName.length());
313  memcpy(FilenamePtr, MainFileName.c_str(), MainFileName.length());
314  StringRef Filename(FilenamePtr, MainFileName.length());
315
316  // Save split dwarf file string.
317  std::string SplitDwarfFile = CGM.getCodeGenOpts().SplitDwarfFile;
318  char *SplitDwarfPtr = DebugInfoNames.Allocate<char>(SplitDwarfFile.length());
319  memcpy(SplitDwarfPtr, SplitDwarfFile.c_str(), SplitDwarfFile.length());
320  StringRef SplitDwarfFilename(SplitDwarfPtr, SplitDwarfFile.length());
321
322  unsigned LangTag;
323  const LangOptions &LO = CGM.getLangOpts();
324  if (LO.CPlusPlus) {
325    if (LO.ObjC1)
326      LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
327    else
328      LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
329  } else if (LO.ObjC1) {
330    LangTag = llvm::dwarf::DW_LANG_ObjC;
331  } else if (LO.C99) {
332    LangTag = llvm::dwarf::DW_LANG_C99;
333  } else {
334    LangTag = llvm::dwarf::DW_LANG_C89;
335  }
336
337  std::string Producer = getClangFullVersion();
338
339  // Figure out which version of the ObjC runtime we have.
340  unsigned RuntimeVers = 0;
341  if (LO.ObjC1)
342    RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
343
344  // Create new compile unit.
345  DBuilder.createCompileUnit(LangTag, Filename, getCurrentDirname(),
346                             Producer, LO.Optimize,
347                             CGM.getCodeGenOpts().DwarfDebugFlags,
348                             RuntimeVers, SplitDwarfFilename);
349  // FIXME - Eliminate TheCU.
350  TheCU = llvm::DICompileUnit(DBuilder.getCU());
351}
352
353/// CreateType - Get the Basic type from the cache or create a new
354/// one if necessary.
355llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
356  unsigned Encoding = 0;
357  StringRef BTName;
358  switch (BT->getKind()) {
359#define BUILTIN_TYPE(Id, SingletonId)
360#define PLACEHOLDER_TYPE(Id, SingletonId) \
361  case BuiltinType::Id:
362#include "clang/AST/BuiltinTypes.def"
363  case BuiltinType::Dependent:
364    llvm_unreachable("Unexpected builtin type");
365  case BuiltinType::NullPtr:
366    return DBuilder.
367      createNullPtrType(BT->getName(CGM.getLangOpts()));
368  case BuiltinType::Void:
369    return llvm::DIType();
370  case BuiltinType::ObjCClass:
371    if (ClassTy.Verify())
372      return ClassTy;
373    ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
374                                         "objc_class", TheCU,
375                                         getOrCreateMainFile(), 0);
376    return ClassTy;
377  case BuiltinType::ObjCId: {
378    // typedef struct objc_class *Class;
379    // typedef struct objc_object {
380    //  Class isa;
381    // } *id;
382
383    if (ObjTy.Verify())
384      return ObjTy;
385
386    if (!ClassTy.Verify())
387      ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
388                                           "objc_class", TheCU,
389                                           getOrCreateMainFile(), 0);
390
391    unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
392
393    llvm::DIType ISATy = DBuilder.createPointerType(ClassTy, Size);
394
395    llvm::DIType FwdTy =
396        DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
397                                  0, 0, 0, 0, llvm::DIType(), llvm::DIArray());
398
399    llvm::TrackingVH<llvm::MDNode> ObjNode(FwdTy);
400    SmallVector<llvm::Value *, 1> EltTys;
401    llvm::DIType FieldTy =
402      DBuilder.createMemberType(llvm::DIDescriptor(ObjNode), "isa",
403                                getOrCreateMainFile(), 0, Size,
404                                0, 0, 0, ISATy);
405    EltTys.push_back(FieldTy);
406    llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
407
408    ObjNode->replaceOperandWith(10, Elements);
409    ObjTy = llvm::DIType(ObjNode);
410    return ObjTy;
411  }
412  case BuiltinType::ObjCSel: {
413    if (SelTy.Verify())
414      return SelTy;
415    SelTy =
416      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
417                                 "objc_selector", TheCU, getOrCreateMainFile(),
418                                 0);
419    return SelTy;
420  }
421
422  case BuiltinType::OCLImage1d:
423    return getOrCreateStructPtrType("opencl_image1d_t",
424                                    OCLImage1dDITy);
425  case BuiltinType::OCLImage1dArray:
426    return getOrCreateStructPtrType("opencl_image1d_array_t",
427                                    OCLImage1dArrayDITy);
428  case BuiltinType::OCLImage1dBuffer:
429    return getOrCreateStructPtrType("opencl_image1d_buffer_t",
430                                    OCLImage1dBufferDITy);
431  case BuiltinType::OCLImage2d:
432    return getOrCreateStructPtrType("opencl_image2d_t",
433                                    OCLImage2dDITy);
434  case BuiltinType::OCLImage2dArray:
435    return getOrCreateStructPtrType("opencl_image2d_array_t",
436                                    OCLImage2dArrayDITy);
437  case BuiltinType::OCLImage3d:
438    return getOrCreateStructPtrType("opencl_image3d_t",
439                                    OCLImage3dDITy);
440  case BuiltinType::OCLSampler:
441    return DBuilder.createBasicType("opencl_sampler_t",
442                                    CGM.getContext().getTypeSize(BT),
443                                    CGM.getContext().getTypeAlign(BT),
444                                    llvm::dwarf::DW_ATE_unsigned);
445  case BuiltinType::OCLEvent:
446    return getOrCreateStructPtrType("opencl_event_t",
447                                    OCLEventDITy);
448
449  case BuiltinType::UChar:
450  case BuiltinType::Char_U: Encoding = llvm::dwarf::DW_ATE_unsigned_char; break;
451  case BuiltinType::Char_S:
452  case BuiltinType::SChar: Encoding = llvm::dwarf::DW_ATE_signed_char; break;
453  case BuiltinType::Char16:
454  case BuiltinType::Char32: Encoding = llvm::dwarf::DW_ATE_UTF; break;
455  case BuiltinType::UShort:
456  case BuiltinType::UInt:
457  case BuiltinType::UInt128:
458  case BuiltinType::ULong:
459  case BuiltinType::WChar_U:
460  case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
461  case BuiltinType::Short:
462  case BuiltinType::Int:
463  case BuiltinType::Int128:
464  case BuiltinType::Long:
465  case BuiltinType::WChar_S:
466  case BuiltinType::LongLong:  Encoding = llvm::dwarf::DW_ATE_signed; break;
467  case BuiltinType::Bool:      Encoding = llvm::dwarf::DW_ATE_boolean; break;
468  case BuiltinType::Half:
469  case BuiltinType::Float:
470  case BuiltinType::LongDouble:
471  case BuiltinType::Double:    Encoding = llvm::dwarf::DW_ATE_float; break;
472  }
473
474  switch (BT->getKind()) {
475  case BuiltinType::Long:      BTName = "long int"; break;
476  case BuiltinType::LongLong:  BTName = "long long int"; break;
477  case BuiltinType::ULong:     BTName = "long unsigned int"; break;
478  case BuiltinType::ULongLong: BTName = "long long unsigned int"; break;
479  default:
480    BTName = BT->getName(CGM.getLangOpts());
481    break;
482  }
483  // Bit size, align and offset of the type.
484  uint64_t Size = CGM.getContext().getTypeSize(BT);
485  uint64_t Align = CGM.getContext().getTypeAlign(BT);
486  llvm::DIType DbgTy =
487    DBuilder.createBasicType(BTName, Size, Align, Encoding);
488  return DbgTy;
489}
490
491llvm::DIType CGDebugInfo::CreateType(const ComplexType *Ty) {
492  // Bit size, align and offset of the type.
493  unsigned Encoding = llvm::dwarf::DW_ATE_complex_float;
494  if (Ty->isComplexIntegerType())
495    Encoding = llvm::dwarf::DW_ATE_lo_user;
496
497  uint64_t Size = CGM.getContext().getTypeSize(Ty);
498  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
499  llvm::DIType DbgTy =
500    DBuilder.createBasicType("complex", Size, Align, Encoding);
501
502  return DbgTy;
503}
504
505/// CreateCVRType - Get the qualified type from the cache or create
506/// a new one if necessary.
507llvm::DIType CGDebugInfo::CreateQualifiedType(QualType Ty, llvm::DIFile Unit) {
508  QualifierCollector Qc;
509  const Type *T = Qc.strip(Ty);
510
511  // Ignore these qualifiers for now.
512  Qc.removeObjCGCAttr();
513  Qc.removeAddressSpace();
514  Qc.removeObjCLifetime();
515
516  // We will create one Derived type for one qualifier and recurse to handle any
517  // additional ones.
518  unsigned Tag;
519  if (Qc.hasConst()) {
520    Tag = llvm::dwarf::DW_TAG_const_type;
521    Qc.removeConst();
522  } else if (Qc.hasVolatile()) {
523    Tag = llvm::dwarf::DW_TAG_volatile_type;
524    Qc.removeVolatile();
525  } else if (Qc.hasRestrict()) {
526    Tag = llvm::dwarf::DW_TAG_restrict_type;
527    Qc.removeRestrict();
528  } else {
529    assert(Qc.empty() && "Unknown type qualifier for debug info");
530    return getOrCreateType(QualType(T, 0), Unit);
531  }
532
533  llvm::DIType FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
534
535  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
536  // CVR derived types.
537  llvm::DIType DbgTy = DBuilder.createQualifiedType(Tag, FromTy);
538
539  return DbgTy;
540}
541
542llvm::DIType CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
543                                     llvm::DIFile Unit) {
544
545  // The frontend treats 'id' as a typedef to an ObjCObjectType,
546  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
547  // debug info, we want to emit 'id' in both cases.
548  if (Ty->isObjCQualifiedIdType())
549      return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
550
551  llvm::DIType DbgTy =
552    CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
553                          Ty->getPointeeType(), Unit);
554  return DbgTy;
555}
556
557llvm::DIType CGDebugInfo::CreateType(const PointerType *Ty,
558                                     llvm::DIFile Unit) {
559  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
560                               Ty->getPointeeType(), Unit);
561}
562
563// Creates a forward declaration for a RecordDecl in the given context.
564llvm::DIType CGDebugInfo::createRecordFwdDecl(const RecordDecl *RD,
565                                              llvm::DIDescriptor Ctx) {
566  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
567  unsigned Line = getLineNumber(RD->getLocation());
568  StringRef RDName = getClassName(RD);
569
570  unsigned Tag = 0;
571  if (RD->isStruct() || RD->isInterface())
572    Tag = llvm::dwarf::DW_TAG_structure_type;
573  else if (RD->isUnion())
574    Tag = llvm::dwarf::DW_TAG_union_type;
575  else {
576    assert(RD->isClass());
577    Tag = llvm::dwarf::DW_TAG_class_type;
578  }
579
580  // Create the type.
581  return DBuilder.createForwardDecl(Tag, RDName, Ctx, DefUnit, Line);
582}
583
584// Walk up the context chain and create forward decls for record decls,
585// and normal descriptors for namespaces.
586llvm::DIDescriptor CGDebugInfo::createContextChain(const Decl *Context) {
587  if (!Context)
588    return TheCU;
589
590  // See if we already have the parent.
591  llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
592    I = RegionMap.find(Context);
593  if (I != RegionMap.end()) {
594    llvm::Value *V = I->second;
595    return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
596  }
597
598  // Check namespace.
599  if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
600    return llvm::DIDescriptor(getOrCreateNameSpace(NSDecl));
601
602  if (const RecordDecl *RD = dyn_cast<RecordDecl>(Context)) {
603    if (!RD->isDependentType()) {
604      llvm::DIType Ty = getOrCreateLimitedType(CGM.getContext().getTypeDeclType(RD),
605                                               getOrCreateMainFile());
606      return llvm::DIDescriptor(Ty);
607    }
608  }
609  return TheCU;
610}
611
612/// CreatePointeeType - Create Pointee type. If Pointee is a record
613/// then emit record's fwd if debug info size reduction is enabled.
614llvm::DIType CGDebugInfo::CreatePointeeType(QualType PointeeTy,
615                                            llvm::DIFile Unit) {
616  if (CGM.getCodeGenOpts().getDebugInfo() != CodeGenOptions::LimitedDebugInfo)
617    return getOrCreateType(PointeeTy, Unit);
618
619  // Limit debug info for the pointee type.
620
621  // If we have an existing type, use that, it's still smaller than creating
622  // a new type.
623  llvm::DIType Ty = getTypeOrNull(PointeeTy);
624  if (Ty.Verify()) return Ty;
625
626  // Handle qualifiers.
627  if (PointeeTy.hasLocalQualifiers())
628    return CreateQualifiedType(PointeeTy, Unit);
629
630  if (const RecordType *RTy = dyn_cast<RecordType>(PointeeTy)) {
631    RecordDecl *RD = RTy->getDecl();
632    llvm::DIDescriptor FDContext =
633      getContextDescriptor(cast<Decl>(RD->getDeclContext()));
634    llvm::DIType RetTy = createRecordFwdDecl(RD, FDContext);
635    TypeCache[QualType(RTy, 0).getAsOpaquePtr()] = RetTy;
636    return RetTy;
637  }
638  return getOrCreateType(PointeeTy, Unit);
639}
640
641llvm::DIType CGDebugInfo::CreatePointerLikeType(unsigned Tag,
642                                                const Type *Ty,
643                                                QualType PointeeTy,
644                                                llvm::DIFile Unit) {
645  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
646      Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
647    return DBuilder.createReferenceType(Tag,
648                                        CreatePointeeType(PointeeTy, Unit));
649
650  // Bit size, align and offset of the type.
651  // Size is always the size of a pointer. We can't use getTypeSize here
652  // because that does not return the correct value for references.
653  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
654  uint64_t Size = CGM.getContext().getTargetInfo().getPointerWidth(AS);
655  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
656
657  return DBuilder.createPointerType(CreatePointeeType(PointeeTy, Unit),
658                                    Size, Align);
659}
660
661llvm::DIType CGDebugInfo::getOrCreateStructPtrType(StringRef Name, llvm::DIType &Cache) {
662    if (Cache.Verify())
663      return Cache;
664    Cache =
665      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
666                                 Name, TheCU, getOrCreateMainFile(),
667                                 0);
668    unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
669    Cache = DBuilder.createPointerType(Cache, Size);
670    return Cache;
671}
672
673llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
674                                     llvm::DIFile Unit) {
675  if (BlockLiteralGenericSet)
676    return BlockLiteralGeneric;
677
678  SmallVector<llvm::Value *, 8> EltTys;
679  llvm::DIType FieldTy;
680  QualType FType;
681  uint64_t FieldSize, FieldOffset;
682  unsigned FieldAlign;
683  llvm::DIArray Elements;
684  llvm::DIType EltTy, DescTy;
685
686  FieldOffset = 0;
687  FType = CGM.getContext().UnsignedLongTy;
688  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
689  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
690
691  Elements = DBuilder.getOrCreateArray(EltTys);
692  EltTys.clear();
693
694  unsigned Flags = llvm::DIDescriptor::FlagAppleBlock;
695  unsigned LineNo = getLineNumber(CurLoc);
696
697  EltTy = DBuilder.createStructType(Unit, "__block_descriptor",
698                                    Unit, LineNo, FieldOffset, 0,
699                                    Flags, llvm::DIType(), Elements);
700
701  // Bit size, align and offset of the type.
702  uint64_t Size = CGM.getContext().getTypeSize(Ty);
703
704  DescTy = DBuilder.createPointerType(EltTy, Size);
705
706  FieldOffset = 0;
707  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
708  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
709  FType = CGM.getContext().IntTy;
710  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
711  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
712  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
713  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
714
715  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
716  FieldTy = DescTy;
717  FieldSize = CGM.getContext().getTypeSize(Ty);
718  FieldAlign = CGM.getContext().getTypeAlign(Ty);
719  FieldTy = DBuilder.createMemberType(Unit, "__descriptor", Unit,
720                                      LineNo, FieldSize, FieldAlign,
721                                      FieldOffset, 0, FieldTy);
722  EltTys.push_back(FieldTy);
723
724  FieldOffset += FieldSize;
725  Elements = DBuilder.getOrCreateArray(EltTys);
726
727  EltTy = DBuilder.createStructType(Unit, "__block_literal_generic",
728                                    Unit, LineNo, FieldOffset, 0,
729                                    Flags, llvm::DIType(), Elements);
730
731  BlockLiteralGenericSet = true;
732  BlockLiteralGeneric = DBuilder.createPointerType(EltTy, Size);
733  return BlockLiteralGeneric;
734}
735
736llvm::DIType CGDebugInfo::CreateType(const TypedefType *Ty, llvm::DIFile Unit) {
737  // Typedefs are derived from some other type.  If we have a typedef of a
738  // typedef, make sure to emit the whole chain.
739  llvm::DIType Src = getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);
740  if (!Src.Verify())
741    return llvm::DIType();
742  // We don't set size information, but do specify where the typedef was
743  // declared.
744  unsigned Line = getLineNumber(Ty->getDecl()->getLocation());
745  const TypedefNameDecl *TyDecl = Ty->getDecl();
746
747  llvm::DIDescriptor TypedefContext =
748    getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext()));
749
750  return
751    DBuilder.createTypedef(Src, TyDecl->getName(), Unit, Line, TypedefContext);
752}
753
754llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
755                                     llvm::DIFile Unit) {
756  SmallVector<llvm::Value *, 16> EltTys;
757
758  // Add the result type at least.
759  EltTys.push_back(getOrCreateType(Ty->getResultType(), Unit));
760
761  // Set up remainder of arguments if there is a prototype.
762  // FIXME: IF NOT, HOW IS THIS REPRESENTED?  llvm-gcc doesn't represent '...'!
763  if (isa<FunctionNoProtoType>(Ty))
764    EltTys.push_back(DBuilder.createUnspecifiedParameter());
765  else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
766    for (unsigned i = 0, e = FPT->getNumArgs(); i != e; ++i)
767      EltTys.push_back(getOrCreateType(FPT->getArgType(i), Unit));
768  }
769
770  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
771  return DBuilder.createSubroutineType(Unit, EltTypeArray);
772}
773
774
775llvm::DIType CGDebugInfo::createFieldType(StringRef name,
776                                          QualType type,
777                                          uint64_t sizeInBitsOverride,
778                                          SourceLocation loc,
779                                          AccessSpecifier AS,
780                                          uint64_t offsetInBits,
781                                          llvm::DIFile tunit,
782                                          llvm::DIDescriptor scope) {
783  llvm::DIType debugType = getOrCreateType(type, tunit);
784
785  // Get the location for the field.
786  llvm::DIFile file = getOrCreateFile(loc);
787  unsigned line = getLineNumber(loc);
788
789  uint64_t sizeInBits = 0;
790  unsigned alignInBits = 0;
791  if (!type->isIncompleteArrayType()) {
792    llvm::tie(sizeInBits, alignInBits) = CGM.getContext().getTypeInfo(type);
793
794    if (sizeInBitsOverride)
795      sizeInBits = sizeInBitsOverride;
796  }
797
798  unsigned flags = 0;
799  if (AS == clang::AS_private)
800    flags |= llvm::DIDescriptor::FlagPrivate;
801  else if (AS == clang::AS_protected)
802    flags |= llvm::DIDescriptor::FlagProtected;
803
804  return DBuilder.createMemberType(scope, name, file, line, sizeInBits,
805                                   alignInBits, offsetInBits, flags, debugType);
806}
807
808/// CollectRecordLambdaFields - Helper for CollectRecordFields.
809void CGDebugInfo::
810CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
811                          SmallVectorImpl<llvm::Value *> &elements,
812                          llvm::DIType RecordTy) {
813  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
814  // has the name and the location of the variable so we should iterate over
815  // both concurrently.
816  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
817  RecordDecl::field_iterator Field = CXXDecl->field_begin();
818  unsigned fieldno = 0;
819  for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
820         E = CXXDecl->captures_end(); I != E; ++I, ++Field, ++fieldno) {
821    const LambdaExpr::Capture C = *I;
822    if (C.capturesVariable()) {
823      VarDecl *V = C.getCapturedVar();
824      llvm::DIFile VUnit = getOrCreateFile(C.getLocation());
825      StringRef VName = V->getName();
826      uint64_t SizeInBitsOverride = 0;
827      if (Field->isBitField()) {
828        SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
829        assert(SizeInBitsOverride && "found named 0-width bitfield");
830      }
831      llvm::DIType fieldType
832        = createFieldType(VName, Field->getType(), SizeInBitsOverride,
833                          C.getLocation(), Field->getAccess(),
834                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
835      elements.push_back(fieldType);
836    } else {
837      // TODO: Need to handle 'this' in some way by probably renaming the
838      // this of the lambda class and having a field member of 'this' or
839      // by using AT_object_pointer for the function and having that be
840      // used as 'this' for semantic references.
841      assert(C.capturesThis() && "Field that isn't captured and isn't this?");
842      FieldDecl *f = *Field;
843      llvm::DIFile VUnit = getOrCreateFile(f->getLocation());
844      QualType type = f->getType();
845      llvm::DIType fieldType
846        = createFieldType("this", type, 0, f->getLocation(), f->getAccess(),
847                          layout.getFieldOffset(fieldno), VUnit, RecordTy);
848
849      elements.push_back(fieldType);
850    }
851  }
852}
853
854/// CollectRecordStaticField - Helper for CollectRecordFields.
855void CGDebugInfo::
856CollectRecordStaticField(const VarDecl *Var,
857                         SmallVectorImpl<llvm::Value *> &elements,
858                         llvm::DIType RecordTy) {
859  // Create the descriptor for the static variable, with or without
860  // constant initializers.
861  llvm::DIFile VUnit = getOrCreateFile(Var->getLocation());
862  llvm::DIType VTy = getOrCreateType(Var->getType(), VUnit);
863
864  // Do not describe enums as static members.
865  if (VTy.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
866    return;
867
868  unsigned LineNumber = getLineNumber(Var->getLocation());
869  StringRef VName = Var->getName();
870  llvm::Constant *C = NULL;
871  if (Var->getInit()) {
872    const APValue *Value = Var->evaluateValue();
873    if (Value) {
874      if (Value->isInt())
875        C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
876      if (Value->isFloat())
877        C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
878    }
879  }
880
881  unsigned Flags = 0;
882  AccessSpecifier Access = Var->getAccess();
883  if (Access == clang::AS_private)
884    Flags |= llvm::DIDescriptor::FlagPrivate;
885  else if (Access == clang::AS_protected)
886    Flags |= llvm::DIDescriptor::FlagProtected;
887
888  llvm::DIType GV = DBuilder.createStaticMemberType(RecordTy, VName, VUnit,
889                                                    LineNumber, VTy, Flags, C);
890  elements.push_back(GV);
891  StaticDataMemberCache[Var->getCanonicalDecl()] = llvm::WeakVH(GV);
892}
893
894/// CollectRecordNormalField - Helper for CollectRecordFields.
895void CGDebugInfo::
896CollectRecordNormalField(const FieldDecl *field, uint64_t OffsetInBits,
897                         llvm::DIFile tunit,
898                         SmallVectorImpl<llvm::Value *> &elements,
899                         llvm::DIType RecordTy) {
900  StringRef name = field->getName();
901  QualType type = field->getType();
902
903  // Ignore unnamed fields unless they're anonymous structs/unions.
904  if (name.empty() && !type->isRecordType())
905    return;
906
907  uint64_t SizeInBitsOverride = 0;
908  if (field->isBitField()) {
909    SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
910    assert(SizeInBitsOverride && "found named 0-width bitfield");
911  }
912
913  llvm::DIType fieldType
914    = createFieldType(name, type, SizeInBitsOverride,
915                      field->getLocation(), field->getAccess(),
916                      OffsetInBits, tunit, RecordTy);
917
918  elements.push_back(fieldType);
919}
920
921/// CollectRecordFields - A helper function to collect debug info for
922/// record fields. This is used while creating debug info entry for a Record.
923void CGDebugInfo::
924CollectRecordFields(const RecordDecl *record, llvm::DIFile tunit,
925                    SmallVectorImpl<llvm::Value *> &elements,
926                    llvm::DIType RecordTy) {
927  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
928
929  if (CXXDecl && CXXDecl->isLambda())
930    CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
931  else {
932    const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
933
934    // Field number for non-static fields.
935    unsigned fieldNo = 0;
936
937    // Bookkeeping for an ms struct, which ignores certain fields.
938    bool IsMsStruct = record->isMsStruct(CGM.getContext());
939    const FieldDecl *LastFD = 0;
940
941    // Static and non-static members should appear in the same order as
942    // the corresponding declarations in the source program.
943    for (RecordDecl::decl_iterator I = record->decls_begin(),
944           E = record->decls_end(); I != E; ++I)
945      if (const VarDecl *V = dyn_cast<VarDecl>(*I))
946        CollectRecordStaticField(V, elements, RecordTy);
947      else if (FieldDecl *field = dyn_cast<FieldDecl>(*I)) {
948        if (IsMsStruct) {
949          // Zero-length bitfields following non-bitfield members are
950          // completely ignored; we don't even count them.
951          if (CGM.getContext().ZeroBitfieldFollowsNonBitfield((field), LastFD))
952            continue;
953          LastFD = field;
954        }
955        CollectRecordNormalField(field, layout.getFieldOffset(fieldNo),
956                                 tunit, elements, RecordTy);
957
958        // Bump field number for next field.
959        ++fieldNo;
960      }
961  }
962}
963
964/// getOrCreateMethodType - CXXMethodDecl's type is a FunctionType. This
965/// function type is not updated to include implicit "this" pointer. Use this
966/// routine to get a method type which includes "this" pointer.
967llvm::DIType
968CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
969                                   llvm::DIFile Unit) {
970  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
971  if (Method->isStatic())
972    return getOrCreateType(QualType(Func, 0), Unit);
973  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
974                                       Func, Unit);
975}
976
977llvm::DIType CGDebugInfo::getOrCreateInstanceMethodType(
978    QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit) {
979  // Add "this" pointer.
980  llvm::DIArray Args = llvm::DICompositeType(
981      getOrCreateType(QualType(Func, 0), Unit)).getTypeArray();
982  assert (Args.getNumElements() && "Invalid number of arguments!");
983
984  SmallVector<llvm::Value *, 16> Elts;
985
986  // First element is always return type. For 'void' functions it is NULL.
987  Elts.push_back(Args.getElement(0));
988
989  // "this" pointer is always first argument.
990  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
991  if (isa<ClassTemplateSpecializationDecl>(RD)) {
992    // Create pointer type directly in this case.
993    const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
994    QualType PointeeTy = ThisPtrTy->getPointeeType();
995    unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
996    uint64_t Size = CGM.getContext().getTargetInfo().getPointerWidth(AS);
997    uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
998    llvm::DIType PointeeType = getOrCreateType(PointeeTy, Unit);
999    llvm::DIType ThisPtrType = DBuilder.createPointerType(PointeeType, Size, Align);
1000    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
1001    // TODO: This and the artificial type below are misleading, the
1002    // types aren't artificial the argument is, but the current
1003    // metadata doesn't represent that.
1004    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1005    Elts.push_back(ThisPtrType);
1006  } else {
1007    llvm::DIType ThisPtrType = getOrCreateType(ThisPtr, Unit);
1008    TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
1009    ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1010    Elts.push_back(ThisPtrType);
1011  }
1012
1013  // Copy rest of the arguments.
1014  for (unsigned i = 1, e = Args.getNumElements(); i != e; ++i)
1015    Elts.push_back(Args.getElement(i));
1016
1017  llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
1018
1019  return DBuilder.createSubroutineType(Unit, EltTypeArray);
1020}
1021
1022/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1023/// inside a function.
1024static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1025  if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1026    return isFunctionLocalClass(NRD);
1027  if (isa<FunctionDecl>(RD->getDeclContext()))
1028    return true;
1029  return false;
1030}
1031
1032/// CreateCXXMemberFunction - A helper function to create a DISubprogram for
1033/// a single member function GlobalDecl.
1034llvm::DISubprogram
1035CGDebugInfo::CreateCXXMemberFunction(const CXXMethodDecl *Method,
1036                                     llvm::DIFile Unit,
1037                                     llvm::DIType RecordTy) {
1038  bool IsCtorOrDtor =
1039    isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1040
1041  StringRef MethodName = getFunctionName(Method);
1042  llvm::DIType MethodTy = getOrCreateMethodType(Method, Unit);
1043
1044  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1045  // make sense to give a single ctor/dtor a linkage name.
1046  StringRef MethodLinkageName;
1047  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1048    MethodLinkageName = CGM.getMangledName(Method);
1049
1050  // Get the location for the method.
1051  llvm::DIFile MethodDefUnit = getOrCreateFile(Method->getLocation());
1052  unsigned MethodLine = getLineNumber(Method->getLocation());
1053
1054  // Collect virtual method info.
1055  llvm::DIType ContainingType;
1056  unsigned Virtuality = 0;
1057  unsigned VIndex = 0;
1058
1059  if (Method->isVirtual()) {
1060    if (Method->isPure())
1061      Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1062    else
1063      Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1064
1065    // It doesn't make sense to give a virtual destructor a vtable index,
1066    // since a single destructor has two entries in the vtable.
1067    if (!isa<CXXDestructorDecl>(Method))
1068      VIndex = CGM.getVTableContext().getMethodVTableIndex(Method);
1069    ContainingType = RecordTy;
1070  }
1071
1072  unsigned Flags = 0;
1073  if (Method->isImplicit())
1074    Flags |= llvm::DIDescriptor::FlagArtificial;
1075  AccessSpecifier Access = Method->getAccess();
1076  if (Access == clang::AS_private)
1077    Flags |= llvm::DIDescriptor::FlagPrivate;
1078  else if (Access == clang::AS_protected)
1079    Flags |= llvm::DIDescriptor::FlagProtected;
1080  if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1081    if (CXXC->isExplicit())
1082      Flags |= llvm::DIDescriptor::FlagExplicit;
1083  } else if (const CXXConversionDecl *CXXC =
1084             dyn_cast<CXXConversionDecl>(Method)) {
1085    if (CXXC->isExplicit())
1086      Flags |= llvm::DIDescriptor::FlagExplicit;
1087  }
1088  if (Method->hasPrototype())
1089    Flags |= llvm::DIDescriptor::FlagPrototyped;
1090
1091  llvm::DIArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1092  llvm::DISubprogram SP =
1093    DBuilder.createMethod(RecordTy, MethodName, MethodLinkageName,
1094                          MethodDefUnit, MethodLine,
1095                          MethodTy, /*isLocalToUnit=*/false,
1096                          /* isDefinition=*/ false,
1097                          Virtuality, VIndex, ContainingType,
1098                          Flags, CGM.getLangOpts().Optimize, NULL,
1099                          TParamsArray);
1100
1101  SPCache[Method->getCanonicalDecl()] = llvm::WeakVH(SP);
1102
1103  return SP;
1104}
1105
1106/// CollectCXXMemberFunctions - A helper function to collect debug info for
1107/// C++ member functions. This is used while creating debug info entry for
1108/// a Record.
1109void CGDebugInfo::
1110CollectCXXMemberFunctions(const CXXRecordDecl *RD, llvm::DIFile Unit,
1111                          SmallVectorImpl<llvm::Value *> &EltTys,
1112                          llvm::DIType RecordTy) {
1113
1114  // Since we want more than just the individual member decls if we
1115  // have templated functions iterate over every declaration to gather
1116  // the functions.
1117  for(DeclContext::decl_iterator I = RD->decls_begin(),
1118        E = RD->decls_end(); I != E; ++I) {
1119    Decl *D = *I;
1120    if (D->isImplicit() && !D->isUsed())
1121      continue;
1122
1123    if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1124      EltTys.push_back(CreateCXXMemberFunction(Method, Unit, RecordTy));
1125    else if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
1126      for (FunctionTemplateDecl::spec_iterator SI = FTD->spec_begin(),
1127             SE = FTD->spec_end(); SI != SE; ++SI)
1128        EltTys.push_back(CreateCXXMemberFunction(cast<CXXMethodDecl>(*SI), Unit,
1129                                                 RecordTy));
1130  }
1131}
1132
1133/// CollectCXXFriends - A helper function to collect debug info for
1134/// C++ base classes. This is used while creating debug info entry for
1135/// a Record.
1136void CGDebugInfo::
1137CollectCXXFriends(const CXXRecordDecl *RD, llvm::DIFile Unit,
1138                SmallVectorImpl<llvm::Value *> &EltTys,
1139                llvm::DIType RecordTy) {
1140  for (CXXRecordDecl::friend_iterator BI = RD->friend_begin(),
1141         BE = RD->friend_end(); BI != BE; ++BI) {
1142    if ((*BI)->isUnsupportedFriend())
1143      continue;
1144    if (TypeSourceInfo *TInfo = (*BI)->getFriendType())
1145      EltTys.push_back(DBuilder.createFriend(RecordTy,
1146                                             getOrCreateType(TInfo->getType(),
1147                                                             Unit)));
1148  }
1149}
1150
1151/// CollectCXXBases - A helper function to collect debug info for
1152/// C++ base classes. This is used while creating debug info entry for
1153/// a Record.
1154void CGDebugInfo::
1155CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile Unit,
1156                SmallVectorImpl<llvm::Value *> &EltTys,
1157                llvm::DIType RecordTy) {
1158
1159  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1160  for (CXXRecordDecl::base_class_const_iterator BI = RD->bases_begin(),
1161         BE = RD->bases_end(); BI != BE; ++BI) {
1162    unsigned BFlags = 0;
1163    uint64_t BaseOffset;
1164
1165    const CXXRecordDecl *Base =
1166      cast<CXXRecordDecl>(BI->getType()->getAs<RecordType>()->getDecl());
1167
1168    if (BI->isVirtual()) {
1169      // virtual base offset offset is -ve. The code generator emits dwarf
1170      // expression where it expects +ve number.
1171      BaseOffset =
1172        0 - CGM.getVTableContext()
1173               .getVirtualBaseOffsetOffset(RD, Base).getQuantity();
1174      BFlags = llvm::DIDescriptor::FlagVirtual;
1175    } else
1176      BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1177    // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1178    // BI->isVirtual() and bits when not.
1179
1180    AccessSpecifier Access = BI->getAccessSpecifier();
1181    if (Access == clang::AS_private)
1182      BFlags |= llvm::DIDescriptor::FlagPrivate;
1183    else if (Access == clang::AS_protected)
1184      BFlags |= llvm::DIDescriptor::FlagProtected;
1185
1186    llvm::DIType DTy =
1187      DBuilder.createInheritance(RecordTy,
1188                                 getOrCreateType(BI->getType(), Unit),
1189                                 BaseOffset, BFlags);
1190    EltTys.push_back(DTy);
1191  }
1192}
1193
1194/// CollectTemplateParams - A helper function to collect template parameters.
1195llvm::DIArray CGDebugInfo::
1196CollectTemplateParams(const TemplateParameterList *TPList,
1197                      const TemplateArgumentList &TAList,
1198                      llvm::DIFile Unit) {
1199  SmallVector<llvm::Value *, 16> TemplateParams;
1200  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1201    const TemplateArgument &TA = TAList[i];
1202    const NamedDecl *ND = TPList->getParam(i);
1203    if (TA.getKind() == TemplateArgument::Type) {
1204      llvm::DIType TTy = getOrCreateType(TA.getAsType(), Unit);
1205      llvm::DITemplateTypeParameter TTP =
1206        DBuilder.createTemplateTypeParameter(TheCU, ND->getName(), TTy);
1207      TemplateParams.push_back(TTP);
1208    } else if (TA.getKind() == TemplateArgument::Integral) {
1209      llvm::DIType TTy = getOrCreateType(TA.getIntegralType(), Unit);
1210      llvm::DITemplateValueParameter TVP =
1211        DBuilder.createTemplateValueParameter(TheCU, ND->getName(), TTy,
1212                                             TA.getAsIntegral().getZExtValue());
1213      TemplateParams.push_back(TVP);
1214    }
1215  }
1216  return DBuilder.getOrCreateArray(TemplateParams);
1217}
1218
1219/// CollectFunctionTemplateParams - A helper function to collect debug
1220/// info for function template parameters.
1221llvm::DIArray CGDebugInfo::
1222CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit) {
1223  if (FD->getTemplatedKind() ==
1224      FunctionDecl::TK_FunctionTemplateSpecialization) {
1225    const TemplateParameterList *TList =
1226      FD->getTemplateSpecializationInfo()->getTemplate()
1227      ->getTemplateParameters();
1228    return
1229      CollectTemplateParams(TList, *FD->getTemplateSpecializationArgs(), Unit);
1230  }
1231  return llvm::DIArray();
1232}
1233
1234/// CollectCXXTemplateParams - A helper function to collect debug info for
1235/// template parameters.
1236llvm::DIArray CGDebugInfo::
1237CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TSpecial,
1238                         llvm::DIFile Unit) {
1239  llvm::PointerUnion<ClassTemplateDecl *,
1240                     ClassTemplatePartialSpecializationDecl *>
1241    PU = TSpecial->getSpecializedTemplateOrPartial();
1242
1243  TemplateParameterList *TPList = PU.is<ClassTemplateDecl *>() ?
1244    PU.get<ClassTemplateDecl *>()->getTemplateParameters() :
1245    PU.get<ClassTemplatePartialSpecializationDecl *>()->getTemplateParameters();
1246  const TemplateArgumentList &TAList = TSpecial->getTemplateInstantiationArgs();
1247  return CollectTemplateParams(TPList, TAList, Unit);
1248}
1249
1250/// getOrCreateVTablePtrType - Return debug info descriptor for vtable.
1251llvm::DIType CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile Unit) {
1252  if (VTablePtrType.isValid())
1253    return VTablePtrType;
1254
1255  ASTContext &Context = CGM.getContext();
1256
1257  /* Function type */
1258  llvm::Value *STy = getOrCreateType(Context.IntTy, Unit);
1259  llvm::DIArray SElements = DBuilder.getOrCreateArray(STy);
1260  llvm::DIType SubTy = DBuilder.createSubroutineType(Unit, SElements);
1261  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1262  llvm::DIType vtbl_ptr_type = DBuilder.createPointerType(SubTy, Size, 0,
1263                                                          "__vtbl_ptr_type");
1264  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1265  return VTablePtrType;
1266}
1267
1268/// getVTableName - Get vtable name for the given Class.
1269StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1270  // Construct gdb compatible name name.
1271  std::string Name = "_vptr$" + RD->getNameAsString();
1272
1273  // Copy this name on the side and use its reference.
1274  char *StrPtr = DebugInfoNames.Allocate<char>(Name.length());
1275  memcpy(StrPtr, Name.data(), Name.length());
1276  return StringRef(StrPtr, Name.length());
1277}
1278
1279
1280/// CollectVTableInfo - If the C++ class has vtable info then insert appropriate
1281/// debug info entry in EltTys vector.
1282void CGDebugInfo::
1283CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile Unit,
1284                  SmallVectorImpl<llvm::Value *> &EltTys) {
1285  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1286
1287  // If there is a primary base then it will hold vtable info.
1288  if (RL.getPrimaryBase())
1289    return;
1290
1291  // If this class is not dynamic then there is not any vtable info to collect.
1292  if (!RD->isDynamicClass())
1293    return;
1294
1295  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1296  llvm::DIType VPTR
1297    = DBuilder.createMemberType(Unit, getVTableName(RD), Unit,
1298                                0, Size, 0, 0, llvm::DIDescriptor::FlagArtificial,
1299                                getOrCreateVTablePtrType(Unit));
1300  EltTys.push_back(VPTR);
1301}
1302
1303/// getOrCreateRecordType - Emit record type's standalone debug info.
1304llvm::DIType CGDebugInfo::getOrCreateRecordType(QualType RTy,
1305                                                SourceLocation Loc) {
1306  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
1307  llvm::DIType T = getOrCreateType(RTy, getOrCreateFile(Loc));
1308  return T;
1309}
1310
1311/// getOrCreateInterfaceType - Emit an objective c interface type standalone
1312/// debug info.
1313llvm::DIType CGDebugInfo::getOrCreateInterfaceType(QualType D,
1314                                                   SourceLocation Loc) {
1315  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
1316  llvm::DIType T = getOrCreateType(D, getOrCreateFile(Loc));
1317  DBuilder.retainType(T);
1318  return T;
1319}
1320
1321/// CreateType - get structure or union type.
1322llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty) {
1323  RecordDecl *RD = Ty->getDecl();
1324
1325  // Get overall information about the record type for the debug info.
1326  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
1327
1328  // Records and classes and unions can all be recursive.  To handle them, we
1329  // first generate a debug descriptor for the struct as a forward declaration.
1330  // Then (if it is a definition) we go through and get debug info for all of
1331  // its members.  Finally, we create a descriptor for the complete type (which
1332  // may refer to the forward decl if the struct is recursive) and replace all
1333  // uses of the forward declaration with the final definition.
1334
1335  llvm::DIType FwdDecl = getOrCreateLimitedType(QualType(Ty, 0), DefUnit);
1336
1337  if (FwdDecl.isForwardDecl())
1338    return FwdDecl;
1339
1340  llvm::TrackingVH<llvm::MDNode> FwdDeclNode(FwdDecl);
1341
1342  // Push the struct on region stack.
1343  LexicalBlockStack.push_back(FwdDeclNode);
1344  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
1345
1346  // Add this to the completed-type cache while we're completing it recursively.
1347  CompletedTypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
1348
1349  // Convert all the elements.
1350  SmallVector<llvm::Value *, 16> EltTys;
1351
1352  // Note: The split of CXXDecl information here is intentional, the
1353  // gdb tests will depend on a certain ordering at printout. The debug
1354  // information offsets are still correct if we merge them all together
1355  // though.
1356  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1357  if (CXXDecl) {
1358    CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
1359    CollectVTableInfo(CXXDecl, DefUnit, EltTys);
1360  }
1361
1362  // Collect data fields (including static variables and any initializers).
1363  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
1364  llvm::DIArray TParamsArray;
1365  if (CXXDecl) {
1366    CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
1367    CollectCXXFriends(CXXDecl, DefUnit, EltTys, FwdDecl);
1368    if (const ClassTemplateSpecializationDecl *TSpecial
1369        = dyn_cast<ClassTemplateSpecializationDecl>(RD))
1370      TParamsArray = CollectCXXTemplateParams(TSpecial, DefUnit);
1371  }
1372
1373  LexicalBlockStack.pop_back();
1374  RegionMap.erase(Ty->getDecl());
1375
1376  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1377  // FIXME: Magic numbers ahoy! These should be changed when we
1378  // get some enums in llvm/Analysis/DebugInfo.h to refer to
1379  // them.
1380  if (RD->isUnion())
1381    FwdDeclNode->replaceOperandWith(10, Elements);
1382  else if (CXXDecl) {
1383    FwdDeclNode->replaceOperandWith(10, Elements);
1384    FwdDeclNode->replaceOperandWith(13, TParamsArray);
1385  } else
1386    FwdDeclNode->replaceOperandWith(10, Elements);
1387
1388  RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDeclNode);
1389  return llvm::DIType(FwdDeclNode);
1390}
1391
1392/// CreateType - get objective-c object type.
1393llvm::DIType CGDebugInfo::CreateType(const ObjCObjectType *Ty,
1394                                     llvm::DIFile Unit) {
1395  // Ignore protocols.
1396  return getOrCreateType(Ty->getBaseType(), Unit);
1397}
1398
1399/// CreateType - get objective-c interface type.
1400llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
1401                                     llvm::DIFile Unit) {
1402  ObjCInterfaceDecl *ID = Ty->getDecl();
1403  if (!ID)
1404    return llvm::DIType();
1405
1406  // Get overall information about the record type for the debug info.
1407  llvm::DIFile DefUnit = getOrCreateFile(ID->getLocation());
1408  unsigned Line = getLineNumber(ID->getLocation());
1409  unsigned RuntimeLang = TheCU.getLanguage();
1410
1411  // If this is just a forward declaration return a special forward-declaration
1412  // debug type since we won't be able to lay out the entire type.
1413  ObjCInterfaceDecl *Def = ID->getDefinition();
1414  if (!Def) {
1415    llvm::DIType FwdDecl =
1416      DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
1417                                 ID->getName(), TheCU, DefUnit, Line,
1418                                 RuntimeLang);
1419    return FwdDecl;
1420  }
1421
1422  ID = Def;
1423
1424  // Bit size, align and offset of the type.
1425  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1426  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1427
1428  unsigned Flags = 0;
1429  if (ID->getImplementation())
1430    Flags |= llvm::DIDescriptor::FlagObjcClassComplete;
1431
1432  llvm::DIType RealDecl =
1433    DBuilder.createStructType(Unit, ID->getName(), DefUnit,
1434                              Line, Size, Align, Flags,
1435                              llvm::DIType(), llvm::DIArray(), RuntimeLang);
1436
1437  // Otherwise, insert it into the CompletedTypeCache so that recursive uses
1438  // will find it and we're emitting the complete type.
1439  QualType QualTy = QualType(Ty, 0);
1440  CompletedTypeCache[QualTy.getAsOpaquePtr()] = RealDecl;
1441  // Push the struct on region stack.
1442  llvm::TrackingVH<llvm::MDNode> FwdDeclNode(RealDecl);
1443
1444  LexicalBlockStack.push_back(FwdDeclNode);
1445  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
1446
1447  // Convert all the elements.
1448  SmallVector<llvm::Value *, 16> EltTys;
1449
1450  ObjCInterfaceDecl *SClass = ID->getSuperClass();
1451  if (SClass) {
1452    llvm::DIType SClassTy =
1453      getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
1454    if (!SClassTy.isValid())
1455      return llvm::DIType();
1456
1457    llvm::DIType InhTag =
1458      DBuilder.createInheritance(RealDecl, SClassTy, 0, 0);
1459    EltTys.push_back(InhTag);
1460  }
1461
1462  for (ObjCContainerDecl::prop_iterator I = ID->prop_begin(),
1463         E = ID->prop_end(); I != E; ++I) {
1464    const ObjCPropertyDecl *PD = *I;
1465    SourceLocation Loc = PD->getLocation();
1466    llvm::DIFile PUnit = getOrCreateFile(Loc);
1467    unsigned PLine = getLineNumber(Loc);
1468    ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1469    ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1470    llvm::MDNode *PropertyNode =
1471      DBuilder.createObjCProperty(PD->getName(),
1472                                  PUnit, PLine,
1473                                  (Getter && Getter->isImplicit()) ? "" :
1474                                  getSelectorName(PD->getGetterName()),
1475                                  (Setter && Setter->isImplicit()) ? "" :
1476                                  getSelectorName(PD->getSetterName()),
1477                                  PD->getPropertyAttributes(),
1478                                  getOrCreateType(PD->getType(), PUnit));
1479    EltTys.push_back(PropertyNode);
1480  }
1481
1482  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
1483  unsigned FieldNo = 0;
1484  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
1485       Field = Field->getNextIvar(), ++FieldNo) {
1486    llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
1487    if (!FieldTy.isValid())
1488      return llvm::DIType();
1489
1490    StringRef FieldName = Field->getName();
1491
1492    // Ignore unnamed fields.
1493    if (FieldName.empty())
1494      continue;
1495
1496    // Get the location for the field.
1497    llvm::DIFile FieldDefUnit = getOrCreateFile(Field->getLocation());
1498    unsigned FieldLine = getLineNumber(Field->getLocation());
1499    QualType FType = Field->getType();
1500    uint64_t FieldSize = 0;
1501    unsigned FieldAlign = 0;
1502
1503    if (!FType->isIncompleteArrayType()) {
1504
1505      // Bit size, align and offset of the type.
1506      FieldSize = Field->isBitField()
1507        ? Field->getBitWidthValue(CGM.getContext())
1508        : CGM.getContext().getTypeSize(FType);
1509      FieldAlign = CGM.getContext().getTypeAlign(FType);
1510    }
1511
1512    uint64_t FieldOffset;
1513    if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
1514      // We don't know the runtime offset of an ivar if we're using the
1515      // non-fragile ABI.  For bitfields, use the bit offset into the first
1516      // byte of storage of the bitfield.  For other fields, use zero.
1517      if (Field->isBitField()) {
1518        FieldOffset = CGM.getObjCRuntime().ComputeBitfieldBitOffset(
1519            CGM, ID, Field);
1520        FieldOffset %= CGM.getContext().getCharWidth();
1521      } else {
1522        FieldOffset = 0;
1523      }
1524    } else {
1525      FieldOffset = RL.getFieldOffset(FieldNo);
1526    }
1527
1528    unsigned Flags = 0;
1529    if (Field->getAccessControl() == ObjCIvarDecl::Protected)
1530      Flags = llvm::DIDescriptor::FlagProtected;
1531    else if (Field->getAccessControl() == ObjCIvarDecl::Private)
1532      Flags = llvm::DIDescriptor::FlagPrivate;
1533
1534    llvm::MDNode *PropertyNode = NULL;
1535    if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
1536      if (ObjCPropertyImplDecl *PImpD =
1537          ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
1538        if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
1539          SourceLocation Loc = PD->getLocation();
1540          llvm::DIFile PUnit = getOrCreateFile(Loc);
1541          unsigned PLine = getLineNumber(Loc);
1542          ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
1543          ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
1544          PropertyNode =
1545            DBuilder.createObjCProperty(PD->getName(),
1546                                        PUnit, PLine,
1547                                        (Getter && Getter->isImplicit()) ? "" :
1548                                        getSelectorName(PD->getGetterName()),
1549                                        (Setter && Setter->isImplicit()) ? "" :
1550                                        getSelectorName(PD->getSetterName()),
1551                                        PD->getPropertyAttributes(),
1552                                        getOrCreateType(PD->getType(), PUnit));
1553        }
1554      }
1555    }
1556    FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit,
1557                                      FieldLine, FieldSize, FieldAlign,
1558                                      FieldOffset, Flags, FieldTy,
1559                                      PropertyNode);
1560    EltTys.push_back(FieldTy);
1561  }
1562
1563  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
1564  FwdDeclNode->replaceOperandWith(10, Elements);
1565
1566  // If the implementation is not yet set, we do not want to mark it
1567  // as complete. An implementation may declare additional
1568  // private ivars that we would miss otherwise.
1569  if (ID->getImplementation() == 0)
1570    CompletedTypeCache.erase(QualTy.getAsOpaquePtr());
1571
1572  LexicalBlockStack.pop_back();
1573  return llvm::DIType(FwdDeclNode);
1574}
1575
1576llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) {
1577  llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
1578  int64_t Count = Ty->getNumElements();
1579  if (Count == 0)
1580    // If number of elements are not known then this is an unbounded array.
1581    // Use Count == -1 to express such arrays.
1582    Count = -1;
1583
1584  llvm::Value *Subscript = DBuilder.getOrCreateSubrange(0, Count);
1585  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
1586
1587  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1588  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1589
1590  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
1591}
1592
1593llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
1594                                     llvm::DIFile Unit) {
1595  uint64_t Size;
1596  uint64_t Align;
1597
1598  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
1599  if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
1600    Size = 0;
1601    Align =
1602      CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
1603  } else if (Ty->isIncompleteArrayType()) {
1604    Size = 0;
1605    if (Ty->getElementType()->isIncompleteType())
1606      Align = 0;
1607    else
1608      Align = CGM.getContext().getTypeAlign(Ty->getElementType());
1609  } else if (Ty->isDependentSizedArrayType() || Ty->isIncompleteType()) {
1610    Size = 0;
1611    Align = 0;
1612  } else {
1613    // Size and align of the whole array, not the element type.
1614    Size = CGM.getContext().getTypeSize(Ty);
1615    Align = CGM.getContext().getTypeAlign(Ty);
1616  }
1617
1618  // Add the dimensions of the array.  FIXME: This loses CV qualifiers from
1619  // interior arrays, do we care?  Why aren't nested arrays represented the
1620  // obvious/recursive way?
1621  SmallVector<llvm::Value *, 8> Subscripts;
1622  QualType EltTy(Ty, 0);
1623  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
1624    // If the number of elements is known, then count is that number. Otherwise,
1625    // it's -1. This allows us to represent a subrange with an array of 0
1626    // elements, like this:
1627    //
1628    //   struct foo {
1629    //     int x[0];
1630    //   };
1631    int64_t Count = -1;         // Count == -1 is an unbounded array.
1632    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
1633      Count = CAT->getSize().getZExtValue();
1634
1635    // FIXME: Verify this is right for VLAs.
1636    Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
1637    EltTy = Ty->getElementType();
1638  }
1639
1640  llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
1641
1642  llvm::DIType DbgTy =
1643    DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
1644                             SubscriptArray);
1645  return DbgTy;
1646}
1647
1648llvm::DIType CGDebugInfo::CreateType(const LValueReferenceType *Ty,
1649                                     llvm::DIFile Unit) {
1650  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type,
1651                               Ty, Ty->getPointeeType(), Unit);
1652}
1653
1654llvm::DIType CGDebugInfo::CreateType(const RValueReferenceType *Ty,
1655                                     llvm::DIFile Unit) {
1656  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type,
1657                               Ty, Ty->getPointeeType(), Unit);
1658}
1659
1660llvm::DIType CGDebugInfo::CreateType(const MemberPointerType *Ty,
1661                                     llvm::DIFile U) {
1662  llvm::DIType ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
1663  if (!Ty->getPointeeType()->isFunctionType())
1664    return DBuilder.createMemberPointerType(
1665        CreatePointeeType(Ty->getPointeeType(), U), ClassType);
1666  return DBuilder.createMemberPointerType(getOrCreateInstanceMethodType(
1667      CGM.getContext().getPointerType(
1668          QualType(Ty->getClass(), Ty->getPointeeType().getCVRQualifiers())),
1669      Ty->getPointeeType()->getAs<FunctionProtoType>(), U),
1670                                          ClassType);
1671}
1672
1673llvm::DIType CGDebugInfo::CreateType(const AtomicType *Ty,
1674                                     llvm::DIFile U) {
1675  // Ignore the atomic wrapping
1676  // FIXME: What is the correct representation?
1677  return getOrCreateType(Ty->getValueType(), U);
1678}
1679
1680/// CreateEnumType - get enumeration type.
1681llvm::DIType CGDebugInfo::CreateEnumType(const EnumDecl *ED) {
1682  uint64_t Size = 0;
1683  uint64_t Align = 0;
1684  if (!ED->getTypeForDecl()->isIncompleteType()) {
1685    Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
1686    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
1687  }
1688
1689  // If this is just a forward declaration, construct an appropriately
1690  // marked node and just return it.
1691  if (!ED->getDefinition()) {
1692    llvm::DIDescriptor EDContext;
1693    EDContext = getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1694    llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1695    unsigned Line = getLineNumber(ED->getLocation());
1696    StringRef EDName = ED->getName();
1697    return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_enumeration_type,
1698                                      EDName, EDContext, DefUnit, Line, 0,
1699                                      Size, Align);
1700  }
1701
1702  // Create DIEnumerator elements for each enumerator.
1703  SmallVector<llvm::Value *, 16> Enumerators;
1704  ED = ED->getDefinition();
1705  for (EnumDecl::enumerator_iterator
1706         Enum = ED->enumerator_begin(), EnumEnd = ED->enumerator_end();
1707       Enum != EnumEnd; ++Enum) {
1708    Enumerators.push_back(
1709      DBuilder.createEnumerator(Enum->getName(),
1710                                Enum->getInitVal().getZExtValue()));
1711  }
1712
1713  // Return a CompositeType for the enum itself.
1714  llvm::DIArray EltArray = DBuilder.getOrCreateArray(Enumerators);
1715
1716  llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
1717  unsigned Line = getLineNumber(ED->getLocation());
1718  llvm::DIDescriptor EnumContext =
1719    getContextDescriptor(cast<Decl>(ED->getDeclContext()));
1720  llvm::DIType ClassTy = ED->isScopedUsingClassTag() ?
1721    getOrCreateType(ED->getIntegerType(), DefUnit) : llvm::DIType();
1722  llvm::DIType DbgTy =
1723    DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit, Line,
1724                                   Size, Align, EltArray,
1725                                   ClassTy);
1726  return DbgTy;
1727}
1728
1729static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
1730  Qualifiers Quals;
1731  do {
1732    Quals += T.getLocalQualifiers();
1733    QualType LastT = T;
1734    switch (T->getTypeClass()) {
1735    default:
1736      return C.getQualifiedType(T.getTypePtr(), Quals);
1737    case Type::TemplateSpecialization:
1738      T = cast<TemplateSpecializationType>(T)->desugar();
1739      break;
1740    case Type::TypeOfExpr:
1741      T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
1742      break;
1743    case Type::TypeOf:
1744      T = cast<TypeOfType>(T)->getUnderlyingType();
1745      break;
1746    case Type::Decltype:
1747      T = cast<DecltypeType>(T)->getUnderlyingType();
1748      break;
1749    case Type::UnaryTransform:
1750      T = cast<UnaryTransformType>(T)->getUnderlyingType();
1751      break;
1752    case Type::Attributed:
1753      T = cast<AttributedType>(T)->getEquivalentType();
1754      break;
1755    case Type::Elaborated:
1756      T = cast<ElaboratedType>(T)->getNamedType();
1757      break;
1758    case Type::Paren:
1759      T = cast<ParenType>(T)->getInnerType();
1760      break;
1761    case Type::SubstTemplateTypeParm:
1762      T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
1763      break;
1764    case Type::Auto:
1765      T = cast<AutoType>(T)->getDeducedType();
1766      break;
1767    }
1768
1769    assert(T != LastT && "Type unwrapping failed to unwrap!");
1770    (void)LastT;
1771  } while (true);
1772}
1773
1774/// getType - Get the type from the cache or return null type if it doesn't exist.
1775llvm::DIType CGDebugInfo::getTypeOrNull(QualType Ty) {
1776
1777  // Unwrap the type as needed for debug information.
1778  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1779
1780  // Check for existing entry.
1781  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1782    TypeCache.find(Ty.getAsOpaquePtr());
1783  if (it != TypeCache.end()) {
1784    // Verify that the debug info still exists.
1785    if (llvm::Value *V = it->second)
1786      return llvm::DIType(cast<llvm::MDNode>(V));
1787  }
1788
1789  return llvm::DIType();
1790}
1791
1792/// getCompletedTypeOrNull - Get the type from the cache or return null if it
1793/// doesn't exist.
1794llvm::DIType CGDebugInfo::getCompletedTypeOrNull(QualType Ty) {
1795
1796  // Unwrap the type as needed for debug information.
1797  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1798
1799  // Check for existing entry.
1800  llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
1801    CompletedTypeCache.find(Ty.getAsOpaquePtr());
1802  if (it != CompletedTypeCache.end()) {
1803    // Verify that the debug info still exists.
1804    if (llvm::Value *V = it->second)
1805      return llvm::DIType(cast<llvm::MDNode>(V));
1806  }
1807
1808  return llvm::DIType();
1809}
1810
1811
1812/// getOrCreateType - Get the type from the cache or create a new
1813/// one if necessary.
1814llvm::DIType CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile Unit) {
1815  if (Ty.isNull())
1816    return llvm::DIType();
1817
1818  // Unwrap the type as needed for debug information.
1819  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1820
1821  llvm::DIType T = getCompletedTypeOrNull(Ty);
1822
1823  if (T.Verify())
1824    return T;
1825
1826  // Otherwise create the type.
1827  llvm::DIType Res = CreateTypeNode(Ty, Unit);
1828
1829  llvm::DIType TC = getTypeOrNull(Ty);
1830  if (TC.Verify() && TC.isForwardDecl())
1831    ReplaceMap.push_back(std::make_pair(Ty.getAsOpaquePtr(),
1832                                        static_cast<llvm::Value*>(TC)));
1833
1834  // Do not cache the type if it may be incomplete.
1835  if (maybeIncompleteInterface(Ty))
1836    return Res;
1837
1838  // And update the type cache.
1839  TypeCache[Ty.getAsOpaquePtr()] = Res;
1840
1841  if (!Res.isForwardDecl())
1842    CompletedTypeCache[Ty.getAsOpaquePtr()] = Res;
1843
1844  return Res;
1845}
1846
1847/// clang::ParseAST handles each TopLevelDecl immediately after it was parsed.
1848/// A subsequent implementation may add more ivars to an interface, which is
1849/// why we cannot cache it yet.
1850bool CGDebugInfo::maybeIncompleteInterface(QualType Ty) {
1851  switch (Ty->getTypeClass()) {
1852  case Type::ObjCObjectPointer:
1853    return maybeIncompleteInterface(cast<ObjCObjectPointerType>(Ty)->getPointeeType());
1854  case Type::ObjCInterface:
1855    if (ObjCInterfaceDecl *Decl = cast<ObjCInterfaceType>(Ty)->getDecl())
1856      return (Decl->getImplementation() == 0);
1857  default:
1858    return false;
1859  }
1860}
1861
1862/// CreateTypeNode - Create a new debug type node.
1863llvm::DIType CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile Unit) {
1864  // Handle qualifiers, which recursively handles what they refer to.
1865  if (Ty.hasLocalQualifiers())
1866    return CreateQualifiedType(Ty, Unit);
1867
1868  const char *Diag = 0;
1869
1870  // Work out details of type.
1871  switch (Ty->getTypeClass()) {
1872#define TYPE(Class, Base)
1873#define ABSTRACT_TYPE(Class, Base)
1874#define NON_CANONICAL_TYPE(Class, Base)
1875#define DEPENDENT_TYPE(Class, Base) case Type::Class:
1876#include "clang/AST/TypeNodes.def"
1877    llvm_unreachable("Dependent types cannot show up in debug information");
1878
1879  case Type::ExtVector:
1880  case Type::Vector:
1881    return CreateType(cast<VectorType>(Ty), Unit);
1882  case Type::ObjCObjectPointer:
1883    return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
1884  case Type::ObjCObject:
1885    return CreateType(cast<ObjCObjectType>(Ty), Unit);
1886  case Type::ObjCInterface:
1887    return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
1888  case Type::Builtin:
1889    return CreateType(cast<BuiltinType>(Ty));
1890  case Type::Complex:
1891    return CreateType(cast<ComplexType>(Ty));
1892  case Type::Pointer:
1893    return CreateType(cast<PointerType>(Ty), Unit);
1894  case Type::BlockPointer:
1895    return CreateType(cast<BlockPointerType>(Ty), Unit);
1896  case Type::Typedef:
1897    return CreateType(cast<TypedefType>(Ty), Unit);
1898  case Type::Record:
1899    return CreateType(cast<RecordType>(Ty));
1900  case Type::Enum:
1901    return CreateEnumType(cast<EnumType>(Ty)->getDecl());
1902  case Type::FunctionProto:
1903  case Type::FunctionNoProto:
1904    return CreateType(cast<FunctionType>(Ty), Unit);
1905  case Type::ConstantArray:
1906  case Type::VariableArray:
1907  case Type::IncompleteArray:
1908    return CreateType(cast<ArrayType>(Ty), Unit);
1909
1910  case Type::LValueReference:
1911    return CreateType(cast<LValueReferenceType>(Ty), Unit);
1912  case Type::RValueReference:
1913    return CreateType(cast<RValueReferenceType>(Ty), Unit);
1914
1915  case Type::MemberPointer:
1916    return CreateType(cast<MemberPointerType>(Ty), Unit);
1917
1918  case Type::Atomic:
1919    return CreateType(cast<AtomicType>(Ty), Unit);
1920
1921  case Type::Attributed:
1922  case Type::TemplateSpecialization:
1923  case Type::Elaborated:
1924  case Type::Paren:
1925  case Type::SubstTemplateTypeParm:
1926  case Type::TypeOfExpr:
1927  case Type::TypeOf:
1928  case Type::Decltype:
1929  case Type::UnaryTransform:
1930  case Type::Auto:
1931    llvm_unreachable("type should have been unwrapped!");
1932  }
1933
1934  assert(Diag && "Fall through without a diagnostic?");
1935  unsigned DiagID = CGM.getDiags().getCustomDiagID(DiagnosticsEngine::Error,
1936                               "debug information for %0 is not yet supported");
1937  CGM.getDiags().Report(DiagID)
1938    << Diag;
1939  return llvm::DIType();
1940}
1941
1942/// getOrCreateLimitedType - Get the type from the cache or create a new
1943/// limited type if necessary.
1944llvm::DIType CGDebugInfo::getOrCreateLimitedType(QualType Ty,
1945                                                 llvm::DIFile Unit) {
1946  if (Ty.isNull())
1947    return llvm::DIType();
1948
1949  // Unwrap the type as needed for debug information.
1950  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
1951
1952  llvm::DIType T = getTypeOrNull(Ty);
1953
1954  // We may have cached a forward decl when we could have created
1955  // a non-forward decl. Go ahead and create a non-forward decl
1956  // now.
1957  if (T.Verify() && !T.isForwardDecl()) return T;
1958
1959  // Otherwise create the type.
1960  llvm::DIType Res = CreateLimitedTypeNode(Ty, Unit);
1961
1962  if (T.Verify() && T.isForwardDecl())
1963    ReplaceMap.push_back(std::make_pair(Ty.getAsOpaquePtr(),
1964                                        static_cast<llvm::Value*>(T)));
1965
1966  // And update the type cache.
1967  TypeCache[Ty.getAsOpaquePtr()] = Res;
1968  return Res;
1969}
1970
1971// TODO: Currently used for context chains when limiting debug info.
1972llvm::DIType CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
1973  RecordDecl *RD = Ty->getDecl();
1974
1975  // Get overall information about the record type for the debug info.
1976  llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
1977  unsigned Line = getLineNumber(RD->getLocation());
1978  StringRef RDName = getClassName(RD);
1979
1980  llvm::DIDescriptor RDContext;
1981  if (CGM.getCodeGenOpts().getDebugInfo() == CodeGenOptions::LimitedDebugInfo)
1982    RDContext = createContextChain(cast<Decl>(RD->getDeclContext()));
1983  else
1984    RDContext = getContextDescriptor(cast<Decl>(RD->getDeclContext()));
1985
1986  // If this is just a forward declaration, construct an appropriately
1987  // marked node and just return it.
1988  if (!RD->getDefinition())
1989    return createRecordFwdDecl(RD, RDContext);
1990
1991  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1992  uint64_t Align = CGM.getContext().getTypeAlign(Ty);
1993  const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1994  llvm::TrackingVH<llvm::MDNode> RealDecl;
1995
1996  if (RD->isUnion())
1997    RealDecl = DBuilder.createUnionType(RDContext, RDName, DefUnit, Line,
1998                                        Size, Align, 0, llvm::DIArray());
1999  else if (RD->isClass()) {
2000    // FIXME: This could be a struct type giving a default visibility different
2001    // than C++ class type, but needs llvm metadata changes first.
2002    RealDecl = DBuilder.createClassType(RDContext, RDName, DefUnit, Line,
2003                                        Size, Align, 0, 0, llvm::DIType(),
2004                                        llvm::DIArray(), llvm::DIType(),
2005                                        llvm::DIArray());
2006  } else
2007    RealDecl = DBuilder.createStructType(RDContext, RDName, DefUnit, Line,
2008					 Size, Align, 0, llvm::DIType(), llvm::DIArray());
2009
2010  RegionMap[Ty->getDecl()] = llvm::WeakVH(RealDecl);
2011  TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = llvm::DIType(RealDecl);
2012
2013  if (CXXDecl) {
2014    // A class's primary base or the class itself contains the vtable.
2015    llvm::MDNode *ContainingType = NULL;
2016    const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2017    if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
2018      // Seek non virtual primary base root.
2019      while (1) {
2020        const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
2021        const CXXRecordDecl *PBT = BRL.getPrimaryBase();
2022        if (PBT && !BRL.isPrimaryBaseVirtual())
2023          PBase = PBT;
2024        else
2025          break;
2026      }
2027      ContainingType =
2028        getOrCreateType(QualType(PBase->getTypeForDecl(), 0), DefUnit);
2029    }
2030    else if (CXXDecl->isDynamicClass())
2031      ContainingType = RealDecl;
2032
2033    RealDecl->replaceOperandWith(12, ContainingType);
2034  }
2035  return llvm::DIType(RealDecl);
2036}
2037
2038/// CreateLimitedTypeNode - Create a new debug type node, but only forward
2039/// declare composite types that haven't been processed yet.
2040llvm::DIType CGDebugInfo::CreateLimitedTypeNode(QualType Ty,llvm::DIFile Unit) {
2041
2042  // Work out details of type.
2043  switch (Ty->getTypeClass()) {
2044#define TYPE(Class, Base)
2045#define ABSTRACT_TYPE(Class, Base)
2046#define NON_CANONICAL_TYPE(Class, Base)
2047#define DEPENDENT_TYPE(Class, Base) case Type::Class:
2048        #include "clang/AST/TypeNodes.def"
2049    llvm_unreachable("Dependent types cannot show up in debug information");
2050
2051  case Type::Record:
2052    return CreateLimitedType(cast<RecordType>(Ty));
2053  default:
2054    return CreateTypeNode(Ty, Unit);
2055  }
2056}
2057
2058/// CreateMemberType - Create new member and increase Offset by FType's size.
2059llvm::DIType CGDebugInfo::CreateMemberType(llvm::DIFile Unit, QualType FType,
2060                                           StringRef Name,
2061                                           uint64_t *Offset) {
2062  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2063  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
2064  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
2065  llvm::DIType Ty = DBuilder.createMemberType(Unit, Name, Unit, 0,
2066                                              FieldSize, FieldAlign,
2067                                              *Offset, 0, FieldTy);
2068  *Offset += FieldSize;
2069  return Ty;
2070}
2071
2072/// getFunctionDeclaration - Return debug info descriptor to describe method
2073/// declaration for the given method definition.
2074llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
2075  const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
2076  if (!FD) return llvm::DISubprogram();
2077
2078  // Setup context.
2079  getContextDescriptor(cast<Decl>(D->getDeclContext()));
2080
2081  llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2082    MI = SPCache.find(FD->getCanonicalDecl());
2083  if (MI != SPCache.end()) {
2084    llvm::Value *V = MI->second;
2085    llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2086    if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
2087      return SP;
2088  }
2089
2090  for (FunctionDecl::redecl_iterator I = FD->redecls_begin(),
2091         E = FD->redecls_end(); I != E; ++I) {
2092    const FunctionDecl *NextFD = *I;
2093    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2094      MI = SPCache.find(NextFD->getCanonicalDecl());
2095    if (MI != SPCache.end()) {
2096      llvm::Value *V = MI->second;
2097      llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(V));
2098      if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
2099        return SP;
2100    }
2101  }
2102  return llvm::DISubprogram();
2103}
2104
2105// getOrCreateFunctionType - Construct DIType. If it is a c++ method, include
2106// implicit parameter "this".
2107llvm::DIType CGDebugInfo::getOrCreateFunctionType(const Decl *D,
2108                                                  QualType FnType,
2109                                                  llvm::DIFile F) {
2110
2111  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
2112    return getOrCreateMethodType(Method, F);
2113  if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
2114    // Add "self" and "_cmd"
2115    SmallVector<llvm::Value *, 16> Elts;
2116
2117    // First element is always return type. For 'void' functions it is NULL.
2118    Elts.push_back(getOrCreateType(OMethod->getResultType(), F));
2119    // "self" pointer is always first argument.
2120    llvm::DIType SelfTy = getOrCreateType(OMethod->getSelfDecl()->getType(), F);
2121    Elts.push_back(DBuilder.createObjectPointerType(SelfTy));
2122    // "_cmd" pointer is always second argument.
2123    llvm::DIType CmdTy = getOrCreateType(OMethod->getCmdDecl()->getType(), F);
2124    Elts.push_back(DBuilder.createArtificialType(CmdTy));
2125    // Get rest of the arguments.
2126    for (ObjCMethodDecl::param_const_iterator PI = OMethod->param_begin(),
2127           PE = OMethod->param_end(); PI != PE; ++PI)
2128      Elts.push_back(getOrCreateType((*PI)->getType(), F));
2129
2130    llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
2131    return DBuilder.createSubroutineType(F, EltTypeArray);
2132  }
2133  return getOrCreateType(FnType, F);
2134}
2135
2136/// EmitFunctionStart - Constructs the debug code for entering a function.
2137void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
2138                                    llvm::Function *Fn,
2139                                    CGBuilderTy &Builder) {
2140
2141  StringRef Name;
2142  StringRef LinkageName;
2143
2144  FnBeginRegionCount.push_back(LexicalBlockStack.size());
2145
2146  const Decl *D = GD.getDecl();
2147  // Function may lack declaration in source code if it is created by Clang
2148  // CodeGen (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk).
2149  bool HasDecl = (D != 0);
2150  // Use the location of the declaration.
2151  SourceLocation Loc;
2152  if (HasDecl)
2153    Loc = D->getLocation();
2154
2155  unsigned Flags = 0;
2156  llvm::DIFile Unit = getOrCreateFile(Loc);
2157  llvm::DIDescriptor FDContext(Unit);
2158  llvm::DIArray TParamsArray;
2159  if (!HasDecl) {
2160    // Use llvm function name.
2161    Name = Fn->getName();
2162  } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2163    // If there is a DISubprogram for this function available then use it.
2164    llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
2165      FI = SPCache.find(FD->getCanonicalDecl());
2166    if (FI != SPCache.end()) {
2167      llvm::Value *V = FI->second;
2168      llvm::DIDescriptor SP(dyn_cast_or_null<llvm::MDNode>(V));
2169      if (SP.isSubprogram() && llvm::DISubprogram(SP).isDefinition()) {
2170        llvm::MDNode *SPN = SP;
2171        LexicalBlockStack.push_back(SPN);
2172        RegionMap[D] = llvm::WeakVH(SP);
2173        return;
2174      }
2175    }
2176    Name = getFunctionName(FD);
2177    // Use mangled name as linkage name for c/c++ functions.
2178    if (FD->hasPrototype()) {
2179      LinkageName = CGM.getMangledName(GD);
2180      Flags |= llvm::DIDescriptor::FlagPrototyped;
2181    }
2182    if (LinkageName == Name ||
2183        CGM.getCodeGenOpts().getDebugInfo() <= CodeGenOptions::DebugLineTablesOnly)
2184      LinkageName = StringRef();
2185
2186    if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
2187      if (const NamespaceDecl *NSDecl =
2188          dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
2189        FDContext = getOrCreateNameSpace(NSDecl);
2190      else if (const RecordDecl *RDecl =
2191               dyn_cast_or_null<RecordDecl>(FD->getDeclContext()))
2192        FDContext = getContextDescriptor(cast<Decl>(RDecl->getDeclContext()));
2193
2194      // Collect template parameters.
2195      TParamsArray = CollectFunctionTemplateParams(FD, Unit);
2196    }
2197  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
2198    Name = getObjCMethodName(OMD);
2199    Flags |= llvm::DIDescriptor::FlagPrototyped;
2200  } else {
2201    // Use llvm function name.
2202    Name = Fn->getName();
2203    Flags |= llvm::DIDescriptor::FlagPrototyped;
2204  }
2205  if (!Name.empty() && Name[0] == '\01')
2206    Name = Name.substr(1);
2207
2208  unsigned LineNo = getLineNumber(Loc);
2209  if (!HasDecl || D->isImplicit())
2210    Flags |= llvm::DIDescriptor::FlagArtificial;
2211
2212  llvm::DIType DIFnType;
2213  llvm::DISubprogram SPDecl;
2214  if (HasDecl &&
2215      CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) {
2216    DIFnType = getOrCreateFunctionType(D, FnType, Unit);
2217    SPDecl = getFunctionDeclaration(D);
2218  } else {
2219    // Create fake but valid subroutine type. Otherwise
2220    // llvm::DISubprogram::Verify() would return false, and
2221    // subprogram DIE will miss DW_AT_decl_file and
2222    // DW_AT_decl_line fields.
2223    SmallVector<llvm::Value*, 16> Elts;
2224    llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
2225    DIFnType = DBuilder.createSubroutineType(Unit, EltTypeArray);
2226  }
2227  llvm::DISubprogram SP;
2228  SP = DBuilder.createFunction(FDContext, Name, LinkageName, Unit,
2229                               LineNo, DIFnType,
2230                               Fn->hasInternalLinkage(), true/*definition*/,
2231                               getLineNumber(CurLoc), Flags,
2232                               CGM.getLangOpts().Optimize,
2233                               Fn, TParamsArray, SPDecl);
2234
2235  // Push function on region stack.
2236  llvm::MDNode *SPN = SP;
2237  LexicalBlockStack.push_back(SPN);
2238  if (HasDecl)
2239    RegionMap[D] = llvm::WeakVH(SP);
2240}
2241
2242/// EmitLocation - Emit metadata to indicate a change in line/column
2243/// information in the source file.
2244void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
2245
2246  // Update our current location
2247  setLocation(Loc);
2248
2249  if (CurLoc.isInvalid() || CurLoc.isMacroID()) return;
2250
2251  // Don't bother if things are the same as last time.
2252  SourceManager &SM = CGM.getContext().getSourceManager();
2253  if (CurLoc == PrevLoc ||
2254      SM.getExpansionLoc(CurLoc) == SM.getExpansionLoc(PrevLoc))
2255    // New Builder may not be in sync with CGDebugInfo.
2256    if (!Builder.getCurrentDebugLocation().isUnknown() &&
2257        Builder.getCurrentDebugLocation().getScope(CGM.getLLVMContext()) ==
2258          LexicalBlockStack.back())
2259      return;
2260
2261  // Update last state.
2262  PrevLoc = CurLoc;
2263
2264  llvm::MDNode *Scope = LexicalBlockStack.back();
2265  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(CurLoc),
2266                                                      getColumnNumber(CurLoc),
2267                                                      Scope));
2268}
2269
2270/// CreateLexicalBlock - Creates a new lexical block node and pushes it on
2271/// the stack.
2272void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
2273  llvm::DIDescriptor D =
2274    DBuilder.createLexicalBlock(LexicalBlockStack.empty() ?
2275                                llvm::DIDescriptor() :
2276                                llvm::DIDescriptor(LexicalBlockStack.back()),
2277                                getOrCreateFile(CurLoc),
2278                                getLineNumber(CurLoc),
2279                                getColumnNumber(CurLoc));
2280  llvm::MDNode *DN = D;
2281  LexicalBlockStack.push_back(DN);
2282}
2283
2284/// EmitLexicalBlockStart - Constructs the debug code for entering a declarative
2285/// region - beginning of a DW_TAG_lexical_block.
2286void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc) {
2287  // Set our current location.
2288  setLocation(Loc);
2289
2290  // Create a new lexical block and push it on the stack.
2291  CreateLexicalBlock(Loc);
2292
2293  // Emit a line table change for the current location inside the new scope.
2294  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(Loc),
2295                                  getColumnNumber(Loc),
2296                                  LexicalBlockStack.back()));
2297}
2298
2299/// EmitLexicalBlockEnd - Constructs the debug code for exiting a declarative
2300/// region - end of a DW_TAG_lexical_block.
2301void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc) {
2302  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2303
2304  // Provide an entry in the line table for the end of the block.
2305  EmitLocation(Builder, Loc);
2306
2307  LexicalBlockStack.pop_back();
2308}
2309
2310/// EmitFunctionEnd - Constructs the debug code for exiting a function.
2311void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
2312  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2313  unsigned RCount = FnBeginRegionCount.back();
2314  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
2315
2316  // Pop all regions for this function.
2317  while (LexicalBlockStack.size() != RCount)
2318    EmitLexicalBlockEnd(Builder, CurLoc);
2319  FnBeginRegionCount.pop_back();
2320}
2321
2322// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
2323// See BuildByRefType.
2324llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
2325                                                       uint64_t *XOffset) {
2326
2327  SmallVector<llvm::Value *, 5> EltTys;
2328  QualType FType;
2329  uint64_t FieldSize, FieldOffset;
2330  unsigned FieldAlign;
2331
2332  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2333  QualType Type = VD->getType();
2334
2335  FieldOffset = 0;
2336  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2337  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
2338  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
2339  FType = CGM.getContext().IntTy;
2340  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
2341  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
2342
2343  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
2344  if (HasCopyAndDispose) {
2345    FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
2346    EltTys.push_back(CreateMemberType(Unit, FType, "__copy_helper",
2347                                      &FieldOffset));
2348    EltTys.push_back(CreateMemberType(Unit, FType, "__destroy_helper",
2349                                      &FieldOffset));
2350  }
2351  bool HasByrefExtendedLayout;
2352  Qualifiers::ObjCLifetime Lifetime;
2353  if (CGM.getContext().getByrefLifetime(Type,
2354                                        Lifetime, HasByrefExtendedLayout)
2355      && HasByrefExtendedLayout)
2356    EltTys.push_back(CreateMemberType(Unit, FType,
2357                                      "__byref_variable_layout",
2358                                      &FieldOffset));
2359
2360  CharUnits Align = CGM.getContext().getDeclAlign(VD);
2361  if (Align > CGM.getContext().toCharUnitsFromBits(
2362        CGM.getContext().getTargetInfo().getPointerAlign(0))) {
2363    CharUnits FieldOffsetInBytes
2364      = CGM.getContext().toCharUnitsFromBits(FieldOffset);
2365    CharUnits AlignedOffsetInBytes
2366      = FieldOffsetInBytes.RoundUpToAlignment(Align);
2367    CharUnits NumPaddingBytes
2368      = AlignedOffsetInBytes - FieldOffsetInBytes;
2369
2370    if (NumPaddingBytes.isPositive()) {
2371      llvm::APInt pad(32, NumPaddingBytes.getQuantity());
2372      FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
2373                                                    pad, ArrayType::Normal, 0);
2374      EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
2375    }
2376  }
2377
2378  FType = Type;
2379  llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2380  FieldSize = CGM.getContext().getTypeSize(FType);
2381  FieldAlign = CGM.getContext().toBits(Align);
2382
2383  *XOffset = FieldOffset;
2384  FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit,
2385                                      0, FieldSize, FieldAlign,
2386                                      FieldOffset, 0, FieldTy);
2387  EltTys.push_back(FieldTy);
2388  FieldOffset += FieldSize;
2389
2390  llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
2391
2392  unsigned Flags = llvm::DIDescriptor::FlagBlockByrefStruct;
2393
2394  return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
2395                                   llvm::DIType(), Elements);
2396}
2397
2398/// EmitDeclare - Emit local variable declaration debug info.
2399void CGDebugInfo::EmitDeclare(const VarDecl *VD, unsigned Tag,
2400                              llvm::Value *Storage,
2401                              unsigned ArgNo, CGBuilderTy &Builder) {
2402  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2403  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2404
2405  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2406  llvm::DIType Ty;
2407  uint64_t XOffset = 0;
2408  if (VD->hasAttr<BlocksAttr>())
2409    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2410  else
2411    Ty = getOrCreateType(VD->getType(), Unit);
2412
2413  // If there is no debug info for this type then do not emit debug info
2414  // for this variable.
2415  if (!Ty)
2416    return;
2417
2418  if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage)) {
2419    // If Storage is an aggregate returned as 'sret' then let debugger know
2420    // about this.
2421    if (Arg->hasStructRetAttr())
2422      Ty = DBuilder.createReferenceType(llvm::dwarf::DW_TAG_reference_type, Ty);
2423    else if (CXXRecordDecl *Record = VD->getType()->getAsCXXRecordDecl()) {
2424      // If an aggregate variable has non trivial destructor or non trivial copy
2425      // constructor than it is pass indirectly. Let debug info know about this
2426      // by using reference of the aggregate type as a argument type.
2427      if (Record->hasNonTrivialCopyConstructor() ||
2428          !Record->hasTrivialDestructor())
2429        Ty = DBuilder.createReferenceType(llvm::dwarf::DW_TAG_reference_type, Ty);
2430    }
2431  }
2432
2433  // Get location information.
2434  unsigned Line = getLineNumber(VD->getLocation());
2435  unsigned Column = getColumnNumber(VD->getLocation());
2436  unsigned Flags = 0;
2437  if (VD->isImplicit())
2438    Flags |= llvm::DIDescriptor::FlagArtificial;
2439  // If this is the first argument and it is implicit then
2440  // give it an object pointer flag.
2441  // FIXME: There has to be a better way to do this, but for static
2442  // functions there won't be an implicit param at arg1 and
2443  // otherwise it is 'self' or 'this'.
2444  if (isa<ImplicitParamDecl>(VD) && ArgNo == 1)
2445    Flags |= llvm::DIDescriptor::FlagObjectPointer;
2446
2447  llvm::MDNode *Scope = LexicalBlockStack.back();
2448
2449  StringRef Name = VD->getName();
2450  if (!Name.empty()) {
2451    if (VD->hasAttr<BlocksAttr>()) {
2452      CharUnits offset = CharUnits::fromQuantity(32);
2453      SmallVector<llvm::Value *, 9> addr;
2454      llvm::Type *Int64Ty = CGM.Int64Ty;
2455      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2456      // offset of __forwarding field
2457      offset = CGM.getContext().toCharUnitsFromBits(
2458        CGM.getContext().getTargetInfo().getPointerWidth(0));
2459      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2460      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2461      addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2462      // offset of x field
2463      offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2464      addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2465
2466      // Create the descriptor for the variable.
2467      llvm::DIVariable D =
2468        DBuilder.createComplexVariable(Tag,
2469                                       llvm::DIDescriptor(Scope),
2470                                       VD->getName(), Unit, Line, Ty,
2471                                       addr, ArgNo);
2472
2473      // Insert an llvm.dbg.declare into the current block.
2474      llvm::Instruction *Call =
2475        DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2476      Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2477      return;
2478    } else if (isa<VariableArrayType>(VD->getType())) {
2479      // These are "complex" variables in that they need an op_deref.
2480      // Create the descriptor for the variable.
2481      llvm::Value *Addr = llvm::ConstantInt::get(CGM.Int64Ty,
2482                                                 llvm::DIBuilder::OpDeref);
2483      llvm::DIVariable D =
2484        DBuilder.createComplexVariable(Tag,
2485                                       llvm::DIDescriptor(Scope),
2486                                       Name, Unit, Line, Ty,
2487                                       Addr, ArgNo);
2488
2489      // Insert an llvm.dbg.declare into the current block.
2490      llvm::Instruction *Call =
2491        DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2492      Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2493      return;
2494    }
2495  } else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
2496    // If VD is an anonymous union then Storage represents value for
2497    // all union fields.
2498    const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
2499    if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
2500      for (RecordDecl::field_iterator I = RD->field_begin(),
2501             E = RD->field_end();
2502           I != E; ++I) {
2503        FieldDecl *Field = *I;
2504        llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
2505        StringRef FieldName = Field->getName();
2506
2507        // Ignore unnamed fields. Do not ignore unnamed records.
2508        if (FieldName.empty() && !isa<RecordType>(Field->getType()))
2509          continue;
2510
2511        // Use VarDecl's Tag, Scope and Line number.
2512        llvm::DIVariable D =
2513          DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2514                                       FieldName, Unit, Line, FieldTy,
2515                                       CGM.getLangOpts().Optimize, Flags,
2516                                       ArgNo);
2517
2518        // Insert an llvm.dbg.declare into the current block.
2519        llvm::Instruction *Call =
2520          DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2521        Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2522      }
2523      return;
2524    }
2525  }
2526
2527  // Create the descriptor for the variable.
2528  llvm::DIVariable D =
2529    DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
2530                                 Name, Unit, Line, Ty,
2531                                 CGM.getLangOpts().Optimize, Flags, ArgNo);
2532
2533  // Insert an llvm.dbg.declare into the current block.
2534  llvm::Instruction *Call =
2535    DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
2536  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
2537}
2538
2539void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
2540                                            llvm::Value *Storage,
2541                                            CGBuilderTy &Builder) {
2542  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2543  EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, 0, Builder);
2544}
2545
2546void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(const VarDecl *VD,
2547                                                    llvm::Value *Storage,
2548                                                    CGBuilderTy &Builder,
2549                                                 const CGBlockInfo &blockInfo) {
2550  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2551  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
2552
2553  if (Builder.GetInsertBlock() == 0)
2554    return;
2555
2556  bool isByRef = VD->hasAttr<BlocksAttr>();
2557
2558  uint64_t XOffset = 0;
2559  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2560  llvm::DIType Ty;
2561  if (isByRef)
2562    Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
2563  else
2564    Ty = getOrCreateType(VD->getType(), Unit);
2565
2566  // Self is passed along as an implicit non-arg variable in a
2567  // block. Mark it as the object pointer.
2568  if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
2569    Ty = DBuilder.createObjectPointerType(Ty);
2570
2571  // Get location information.
2572  unsigned Line = getLineNumber(VD->getLocation());
2573  unsigned Column = getColumnNumber(VD->getLocation());
2574
2575  const llvm::DataLayout &target = CGM.getDataLayout();
2576
2577  CharUnits offset = CharUnits::fromQuantity(
2578    target.getStructLayout(blockInfo.StructureType)
2579          ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
2580
2581  SmallVector<llvm::Value *, 9> addr;
2582  llvm::Type *Int64Ty = CGM.Int64Ty;
2583  addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2584  addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2585  if (isByRef) {
2586    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2587    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2588    // offset of __forwarding field
2589    offset = CGM.getContext()
2590                .toCharUnitsFromBits(target.getPointerSizeInBits(0));
2591    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2592    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
2593    addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
2594    // offset of x field
2595    offset = CGM.getContext().toCharUnitsFromBits(XOffset);
2596    addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
2597  }
2598
2599  // Create the descriptor for the variable.
2600  llvm::DIVariable D =
2601    DBuilder.createComplexVariable(llvm::dwarf::DW_TAG_auto_variable,
2602                                   llvm::DIDescriptor(LexicalBlockStack.back()),
2603                                   VD->getName(), Unit, Line, Ty, addr);
2604  // Insert an llvm.dbg.declare into the current block.
2605  llvm::Instruction *Call =
2606    DBuilder.insertDeclare(Storage, D, Builder.GetInsertPoint());
2607  Call->setDebugLoc(llvm::DebugLoc::get(Line, Column,
2608                                        LexicalBlockStack.back()));
2609}
2610
2611/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
2612/// variable declaration.
2613void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
2614                                           unsigned ArgNo,
2615                                           CGBuilderTy &Builder) {
2616  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2617  EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, ArgNo, Builder);
2618}
2619
2620namespace {
2621  struct BlockLayoutChunk {
2622    uint64_t OffsetInBits;
2623    const BlockDecl::Capture *Capture;
2624  };
2625  bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
2626    return l.OffsetInBits < r.OffsetInBits;
2627  }
2628}
2629
2630void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
2631                                                       llvm::Value *addr,
2632                                                       CGBuilderTy &Builder) {
2633  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2634  ASTContext &C = CGM.getContext();
2635  const BlockDecl *blockDecl = block.getBlockDecl();
2636
2637  // Collect some general information about the block's location.
2638  SourceLocation loc = blockDecl->getCaretLocation();
2639  llvm::DIFile tunit = getOrCreateFile(loc);
2640  unsigned line = getLineNumber(loc);
2641  unsigned column = getColumnNumber(loc);
2642
2643  // Build the debug-info type for the block literal.
2644  getContextDescriptor(cast<Decl>(blockDecl->getDeclContext()));
2645
2646  const llvm::StructLayout *blockLayout =
2647    CGM.getDataLayout().getStructLayout(block.StructureType);
2648
2649  SmallVector<llvm::Value*, 16> fields;
2650  fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
2651                                   blockLayout->getElementOffsetInBits(0),
2652                                   tunit, tunit));
2653  fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
2654                                   blockLayout->getElementOffsetInBits(1),
2655                                   tunit, tunit));
2656  fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
2657                                   blockLayout->getElementOffsetInBits(2),
2658                                   tunit, tunit));
2659  fields.push_back(createFieldType("__FuncPtr", C.VoidPtrTy, 0, loc, AS_public,
2660                                   blockLayout->getElementOffsetInBits(3),
2661                                   tunit, tunit));
2662  fields.push_back(createFieldType("__descriptor",
2663                                   C.getPointerType(block.NeedsCopyDispose ?
2664                                        C.getBlockDescriptorExtendedType() :
2665                                        C.getBlockDescriptorType()),
2666                                   0, loc, AS_public,
2667                                   blockLayout->getElementOffsetInBits(4),
2668                                   tunit, tunit));
2669
2670  // We want to sort the captures by offset, not because DWARF
2671  // requires this, but because we're paranoid about debuggers.
2672  SmallVector<BlockLayoutChunk, 8> chunks;
2673
2674  // 'this' capture.
2675  if (blockDecl->capturesCXXThis()) {
2676    BlockLayoutChunk chunk;
2677    chunk.OffsetInBits =
2678      blockLayout->getElementOffsetInBits(block.CXXThisIndex);
2679    chunk.Capture = 0;
2680    chunks.push_back(chunk);
2681  }
2682
2683  // Variable captures.
2684  for (BlockDecl::capture_const_iterator
2685         i = blockDecl->capture_begin(), e = blockDecl->capture_end();
2686       i != e; ++i) {
2687    const BlockDecl::Capture &capture = *i;
2688    const VarDecl *variable = capture.getVariable();
2689    const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
2690
2691    // Ignore constant captures.
2692    if (captureInfo.isConstant())
2693      continue;
2694
2695    BlockLayoutChunk chunk;
2696    chunk.OffsetInBits =
2697      blockLayout->getElementOffsetInBits(captureInfo.getIndex());
2698    chunk.Capture = &capture;
2699    chunks.push_back(chunk);
2700  }
2701
2702  // Sort by offset.
2703  llvm::array_pod_sort(chunks.begin(), chunks.end());
2704
2705  for (SmallVectorImpl<BlockLayoutChunk>::iterator
2706         i = chunks.begin(), e = chunks.end(); i != e; ++i) {
2707    uint64_t offsetInBits = i->OffsetInBits;
2708    const BlockDecl::Capture *capture = i->Capture;
2709
2710    // If we have a null capture, this must be the C++ 'this' capture.
2711    if (!capture) {
2712      const CXXMethodDecl *method =
2713        cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
2714      QualType type = method->getThisType(C);
2715
2716      fields.push_back(createFieldType("this", type, 0, loc, AS_public,
2717                                       offsetInBits, tunit, tunit));
2718      continue;
2719    }
2720
2721    const VarDecl *variable = capture->getVariable();
2722    StringRef name = variable->getName();
2723
2724    llvm::DIType fieldType;
2725    if (capture->isByRef()) {
2726      std::pair<uint64_t,unsigned> ptrInfo = C.getTypeInfo(C.VoidPtrTy);
2727
2728      // FIXME: this creates a second copy of this type!
2729      uint64_t xoffset;
2730      fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
2731      fieldType = DBuilder.createPointerType(fieldType, ptrInfo.first);
2732      fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
2733                                            ptrInfo.first, ptrInfo.second,
2734                                            offsetInBits, 0, fieldType);
2735    } else {
2736      fieldType = createFieldType(name, variable->getType(), 0,
2737                                  loc, AS_public, offsetInBits, tunit, tunit);
2738    }
2739    fields.push_back(fieldType);
2740  }
2741
2742  SmallString<36> typeName;
2743  llvm::raw_svector_ostream(typeName)
2744    << "__block_literal_" << CGM.getUniqueBlockCount();
2745
2746  llvm::DIArray fieldsArray = DBuilder.getOrCreateArray(fields);
2747
2748  llvm::DIType type =
2749    DBuilder.createStructType(tunit, typeName.str(), tunit, line,
2750                              CGM.getContext().toBits(block.BlockSize),
2751                              CGM.getContext().toBits(block.BlockAlign),
2752                              0, llvm::DIType(), fieldsArray);
2753  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
2754
2755  // Get overall information about the block.
2756  unsigned flags = llvm::DIDescriptor::FlagArtificial;
2757  llvm::MDNode *scope = LexicalBlockStack.back();
2758  StringRef name = ".block_descriptor";
2759
2760  // Create the descriptor for the parameter.
2761  llvm::DIVariable debugVar =
2762    DBuilder.createLocalVariable(llvm::dwarf::DW_TAG_arg_variable,
2763                                 llvm::DIDescriptor(scope),
2764                                 name, tunit, line, type,
2765                                 CGM.getLangOpts().Optimize, flags,
2766                                 cast<llvm::Argument>(addr)->getArgNo() + 1);
2767
2768  // Insert an llvm.dbg.value into the current block.
2769  llvm::Instruction *declare =
2770    DBuilder.insertDbgValueIntrinsic(addr, 0, debugVar,
2771                                     Builder.GetInsertBlock());
2772  declare->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
2773}
2774
2775/// getStaticDataMemberDeclaration - If D is an out-of-class definition of
2776/// a static data member of a class, find its corresponding in-class
2777/// declaration.
2778llvm::DIDerivedType CGDebugInfo::getStaticDataMemberDeclaration(const Decl *D) {
2779  if (cast<VarDecl>(D)->isStaticDataMember()) {
2780    llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
2781      MI = StaticDataMemberCache.find(D->getCanonicalDecl());
2782    if (MI != StaticDataMemberCache.end())
2783      // Verify the info still exists.
2784      if (llvm::Value *V = MI->second)
2785        return llvm::DIDerivedType(cast<llvm::MDNode>(V));
2786  }
2787  return llvm::DIDerivedType();
2788}
2789
2790/// EmitGlobalVariable - Emit information about a global variable.
2791void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
2792                                     const VarDecl *D) {
2793  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2794  // Create global variable debug descriptor.
2795  llvm::DIFile Unit = getOrCreateFile(D->getLocation());
2796  unsigned LineNo = getLineNumber(D->getLocation());
2797
2798  setLocation(D->getLocation());
2799
2800  QualType T = D->getType();
2801  if (T->isIncompleteArrayType()) {
2802
2803    // CodeGen turns int[] into int[1] so we'll do the same here.
2804    llvm::APInt ConstVal(32, 1);
2805    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
2806
2807    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
2808                                              ArrayType::Normal, 0);
2809  }
2810  StringRef DeclName = D->getName();
2811  StringRef LinkageName;
2812  if (D->getDeclContext() && !isa<FunctionDecl>(D->getDeclContext())
2813      && !isa<ObjCMethodDecl>(D->getDeclContext()))
2814    LinkageName = Var->getName();
2815  if (LinkageName == DeclName)
2816    LinkageName = StringRef();
2817  llvm::DIDescriptor DContext =
2818    getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()));
2819  DBuilder.createStaticVariable(DContext, DeclName, LinkageName,
2820                                Unit, LineNo, getOrCreateType(T, Unit),
2821                                Var->hasInternalLinkage(), Var,
2822                                getStaticDataMemberDeclaration(D));
2823}
2824
2825/// EmitGlobalVariable - Emit information about an objective-c interface.
2826void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
2827                                     ObjCInterfaceDecl *ID) {
2828  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2829  // Create global variable debug descriptor.
2830  llvm::DIFile Unit = getOrCreateFile(ID->getLocation());
2831  unsigned LineNo = getLineNumber(ID->getLocation());
2832
2833  StringRef Name = ID->getName();
2834
2835  QualType T = CGM.getContext().getObjCInterfaceType(ID);
2836  if (T->isIncompleteArrayType()) {
2837
2838    // CodeGen turns int[] into int[1] so we'll do the same here.
2839    llvm::APInt ConstVal(32, 1);
2840    QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
2841
2842    T = CGM.getContext().getConstantArrayType(ET, ConstVal,
2843                                           ArrayType::Normal, 0);
2844  }
2845
2846  DBuilder.createGlobalVariable(Name, Unit, LineNo,
2847                                getOrCreateType(T, Unit),
2848                                Var->hasInternalLinkage(), Var);
2849}
2850
2851/// EmitGlobalVariable - Emit global variable's debug info.
2852void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
2853                                     llvm::Constant *Init) {
2854  assert(CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo);
2855  // Create the descriptor for the variable.
2856  llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
2857  StringRef Name = VD->getName();
2858  llvm::DIType Ty = getOrCreateType(VD->getType(), Unit);
2859  if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
2860    const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
2861    assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
2862    Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
2863  }
2864  // Do not use DIGlobalVariable for enums.
2865  if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
2866    return;
2867  DBuilder.createStaticVariable(Unit, Name, Name, Unit,
2868                                getLineNumber(VD->getLocation()),
2869                                Ty, true, Init,
2870                                getStaticDataMemberDeclaration(VD));
2871}
2872
2873/// getOrCreateNamesSpace - Return namespace descriptor for the given
2874/// namespace decl.
2875llvm::DINameSpace
2876CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
2877  llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH>::iterator I =
2878    NameSpaceCache.find(NSDecl);
2879  if (I != NameSpaceCache.end())
2880    return llvm::DINameSpace(cast<llvm::MDNode>(I->second));
2881
2882  unsigned LineNo = getLineNumber(NSDecl->getLocation());
2883  llvm::DIFile FileD = getOrCreateFile(NSDecl->getLocation());
2884  llvm::DIDescriptor Context =
2885    getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()));
2886  llvm::DINameSpace NS =
2887    DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
2888  NameSpaceCache[NSDecl] = llvm::WeakVH(NS);
2889  return NS;
2890}
2891
2892void CGDebugInfo::finalize() {
2893  for (std::vector<std::pair<void *, llvm::WeakVH> >::const_iterator VI
2894         = ReplaceMap.begin(), VE = ReplaceMap.end(); VI != VE; ++VI) {
2895    llvm::DIType Ty, RepTy;
2896    // Verify that the debug info still exists.
2897    if (llvm::Value *V = VI->second)
2898      Ty = llvm::DIType(cast<llvm::MDNode>(V));
2899
2900    llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
2901      TypeCache.find(VI->first);
2902    if (it != TypeCache.end()) {
2903      // Verify that the debug info still exists.
2904      if (llvm::Value *V = it->second)
2905        RepTy = llvm::DIType(cast<llvm::MDNode>(V));
2906    }
2907
2908    if (Ty.Verify() && Ty.isForwardDecl() && RepTy.Verify()) {
2909      Ty.replaceAllUsesWith(RepTy);
2910    }
2911  }
2912  DBuilder.finalize();
2913}
2914