clang  8.0.0svn
CGDebugInfo.cpp
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1 //===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This coordinates the debug information generation while generating code.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CGDebugInfo.h"
15 #include "CGBlocks.h"
16 #include "CGCXXABI.h"
17 #include "CGObjCRuntime.h"
18 #include "CGRecordLayout.h"
19 #include "CodeGenFunction.h"
20 #include "CodeGenModule.h"
21 #include "ConstantEmitter.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/DeclFriend.h"
24 #include "clang/AST/DeclObjC.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/Expr.h"
27 #include "clang/AST/RecordLayout.h"
30 #include "clang/Basic/Version.h"
34 #include "clang/Lex/ModuleMap.h"
36 #include "llvm/ADT/DenseSet.h"
37 #include "llvm/ADT/SmallVector.h"
38 #include "llvm/ADT/StringExtras.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DataLayout.h"
41 #include "llvm/IR/DerivedTypes.h"
42 #include "llvm/IR/Instructions.h"
43 #include "llvm/IR/Intrinsics.h"
44 #include "llvm/IR/Metadata.h"
45 #include "llvm/IR/Module.h"
46 #include "llvm/Support/FileSystem.h"
47 #include "llvm/Support/MD5.h"
48 #include "llvm/Support/Path.h"
49 using namespace clang;
50 using namespace clang::CodeGen;
51 
52 static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
53  auto TI = Ctx.getTypeInfo(Ty);
54  return TI.AlignIsRequired ? TI.Align : 0;
55 }
56 
57 static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
58  return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
59 }
60 
61 static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
62  return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
63 }
64 
66  : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
67  DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
68  DBuilder(CGM.getModule()) {
69  for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
70  DebugPrefixMap[KV.first] = KV.second;
71  CreateCompileUnit();
72 }
73 
75  assert(LexicalBlockStack.empty() &&
76  "Region stack mismatch, stack not empty!");
77 }
78 
79 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
80  SourceLocation TemporaryLocation)
81  : CGF(&CGF) {
82  init(TemporaryLocation);
83 }
84 
85 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
86  bool DefaultToEmpty,
87  SourceLocation TemporaryLocation)
88  : CGF(&CGF) {
89  init(TemporaryLocation, DefaultToEmpty);
90 }
91 
92 void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
93  bool DefaultToEmpty) {
94  auto *DI = CGF->getDebugInfo();
95  if (!DI) {
96  CGF = nullptr;
97  return;
98  }
99 
100  OriginalLocation = CGF->Builder.getCurrentDebugLocation();
101 
102  if (OriginalLocation && !DI->CGM.getExpressionLocationsEnabled())
103  return;
104 
105  if (TemporaryLocation.isValid()) {
106  DI->EmitLocation(CGF->Builder, TemporaryLocation);
107  return;
108  }
109 
110  if (DefaultToEmpty) {
111  CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
112  return;
113  }
114 
115  // Construct a location that has a valid scope, but no line info.
116  assert(!DI->LexicalBlockStack.empty());
117  CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
118  0, 0, DI->LexicalBlockStack.back(), DI->getInlinedAt()));
119 }
120 
121 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
122  : CGF(&CGF) {
123  init(E->getExprLoc());
124 }
125 
126 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
127  : CGF(&CGF) {
128  if (!CGF.getDebugInfo()) {
129  this->CGF = nullptr;
130  return;
131  }
132  OriginalLocation = CGF.Builder.getCurrentDebugLocation();
133  if (Loc)
134  CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
135 }
136 
138  // Query CGF so the location isn't overwritten when location updates are
139  // temporarily disabled (for C++ default function arguments)
140  if (CGF)
141  CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
142 }
143 
145  GlobalDecl InlinedFn)
146  : CGF(&CGF) {
147  if (!CGF.getDebugInfo()) {
148  this->CGF = nullptr;
149  return;
150  }
151  auto &DI = *CGF.getDebugInfo();
152  SavedLocation = DI.getLocation();
153  assert((DI.getInlinedAt() ==
154  CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&
155  "CGDebugInfo and IRBuilder are out of sync");
156 
157  DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
158 }
159 
161  if (!CGF)
162  return;
163  auto &DI = *CGF->getDebugInfo();
165  DI.EmitLocation(CGF->Builder, SavedLocation);
166 }
167 
169  // If the new location isn't valid return.
170  if (Loc.isInvalid())
171  return;
172 
173  CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
174 
175  // If we've changed files in the middle of a lexical scope go ahead
176  // and create a new lexical scope with file node if it's different
177  // from the one in the scope.
178  if (LexicalBlockStack.empty())
179  return;
180 
181  SourceManager &SM = CGM.getContext().getSourceManager();
182  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
183  PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
184 
185  if (PCLoc.isInvalid() || Scope->getFilename() == PCLoc.getFilename())
186  return;
187 
188  if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
189  LexicalBlockStack.pop_back();
190  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
191  LBF->getScope(), getOrCreateFile(CurLoc)));
192  } else if (isa<llvm::DILexicalBlock>(Scope) ||
193  isa<llvm::DISubprogram>(Scope)) {
194  LexicalBlockStack.pop_back();
195  LexicalBlockStack.emplace_back(
196  DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
197  }
198 }
199 
200 llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
201  llvm::DIScope *Mod = getParentModuleOrNull(D);
202  return getContextDescriptor(cast<Decl>(D->getDeclContext()),
203  Mod ? Mod : TheCU);
204 }
205 
206 llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
207  llvm::DIScope *Default) {
208  if (!Context)
209  return Default;
210 
211  auto I = RegionMap.find(Context);
212  if (I != RegionMap.end()) {
213  llvm::Metadata *V = I->second;
214  return dyn_cast_or_null<llvm::DIScope>(V);
215  }
216 
217  // Check namespace.
218  if (const auto *NSDecl = dyn_cast<NamespaceDecl>(Context))
219  return getOrCreateNamespace(NSDecl);
220 
221  if (const auto *RDecl = dyn_cast<RecordDecl>(Context))
222  if (!RDecl->isDependentType())
223  return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
224  getOrCreateMainFile());
225  return Default;
226 }
227 
228 PrintingPolicy CGDebugInfo::getPrintingPolicy() const {
229  PrintingPolicy PP = CGM.getContext().getPrintingPolicy();
230 
231  // If we're emitting codeview, it's important to try to match MSVC's naming so
232  // that visualizers written for MSVC will trigger for our class names. In
233  // particular, we can't have spaces between arguments of standard templates
234  // like basic_string and vector.
235  if (CGM.getCodeGenOpts().EmitCodeView)
236  PP.MSVCFormatting = true;
237 
238  return PP;
239 }
240 
241 StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
242  assert(FD && "Invalid FunctionDecl!");
243  IdentifierInfo *FII = FD->getIdentifier();
246 
247  // Emit the unqualified name in normal operation. LLVM and the debugger can
248  // compute the fully qualified name from the scope chain. If we're only
249  // emitting line table info, there won't be any scope chains, so emit the
250  // fully qualified name here so that stack traces are more accurate.
251  // FIXME: Do this when emitting DWARF as well as when emitting CodeView after
252  // evaluating the size impact.
253  bool UseQualifiedName = DebugKind == codegenoptions::DebugLineTablesOnly &&
254  CGM.getCodeGenOpts().EmitCodeView;
255 
256  if (!Info && FII && !UseQualifiedName)
257  return FII->getName();
258 
259  SmallString<128> NS;
260  llvm::raw_svector_ostream OS(NS);
261  if (!UseQualifiedName)
262  FD->printName(OS);
263  else
264  FD->printQualifiedName(OS, getPrintingPolicy());
265 
266  // Add any template specialization args.
267  if (Info) {
268  const TemplateArgumentList *TArgs = Info->TemplateArguments;
269  printTemplateArgumentList(OS, TArgs->asArray(), getPrintingPolicy());
270  }
271 
272  // Copy this name on the side and use its reference.
273  return internString(OS.str());
274 }
275 
276 StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
277  SmallString<256> MethodName;
278  llvm::raw_svector_ostream OS(MethodName);
279  OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
280  const DeclContext *DC = OMD->getDeclContext();
281  if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
282  OS << OID->getName();
283  } else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
284  OS << OID->getName();
285  } else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
286  if (OC->IsClassExtension()) {
287  OS << OC->getClassInterface()->getName();
288  } else {
289  OS << OC->getIdentifier()->getNameStart() << '('
290  << OC->getIdentifier()->getNameStart() << ')';
291  }
292  } else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {
293  OS << OCD->getClassInterface()->getName() << '(' << OCD->getName() << ')';
294  } else if (isa<ObjCProtocolDecl>(DC)) {
295  // We can extract the type of the class from the self pointer.
296  if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
297  QualType ClassTy =
298  cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
299  ClassTy.print(OS, PrintingPolicy(LangOptions()));
300  }
301  }
302  OS << ' ' << OMD->getSelector().getAsString() << ']';
303 
304  return internString(OS.str());
305 }
306 
307 StringRef CGDebugInfo::getSelectorName(Selector S) {
308  return internString(S.getAsString());
309 }
310 
311 StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
312  if (isa<ClassTemplateSpecializationDecl>(RD)) {
313  SmallString<128> Name;
314  llvm::raw_svector_ostream OS(Name);
315  RD->getNameForDiagnostic(OS, getPrintingPolicy(),
316  /*Qualified*/ false);
317 
318  // Copy this name on the side and use its reference.
319  return internString(Name);
320  }
321 
322  // quick optimization to avoid having to intern strings that are already
323  // stored reliably elsewhere
324  if (const IdentifierInfo *II = RD->getIdentifier())
325  return II->getName();
326 
327  // The CodeView printer in LLVM wants to see the names of unnamed types: it is
328  // used to reconstruct the fully qualified type names.
329  if (CGM.getCodeGenOpts().EmitCodeView) {
330  if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
331  assert(RD->getDeclContext() == D->getDeclContext() &&
332  "Typedef should not be in another decl context!");
333  assert(D->getDeclName().getAsIdentifierInfo() &&
334  "Typedef was not named!");
335  return D->getDeclName().getAsIdentifierInfo()->getName();
336  }
337 
338  if (CGM.getLangOpts().CPlusPlus) {
339  StringRef Name;
340 
341  ASTContext &Context = CGM.getContext();
342  if (const DeclaratorDecl *DD = Context.getDeclaratorForUnnamedTagDecl(RD))
343  // Anonymous types without a name for linkage purposes have their
344  // declarator mangled in if they have one.
345  Name = DD->getName();
346  else if (const TypedefNameDecl *TND =
348  // Anonymous types without a name for linkage purposes have their
349  // associate typedef mangled in if they have one.
350  Name = TND->getName();
351 
352  if (!Name.empty()) {
353  SmallString<256> UnnamedType("<unnamed-type-");
354  UnnamedType += Name;
355  UnnamedType += '>';
356  return internString(UnnamedType);
357  }
358  }
359  }
360 
361  return StringRef();
362 }
363 
365 CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
366  Checksum.clear();
367 
368  if (!CGM.getCodeGenOpts().EmitCodeView &&
369  CGM.getCodeGenOpts().DwarfVersion < 5)
370  return None;
371 
372  SourceManager &SM = CGM.getContext().getSourceManager();
373  bool Invalid;
374  llvm::MemoryBuffer *MemBuffer = SM.getBuffer(FID, &Invalid);
375  if (Invalid)
376  return None;
377 
378  llvm::MD5 Hash;
379  llvm::MD5::MD5Result Result;
380 
381  Hash.update(MemBuffer->getBuffer());
382  Hash.final(Result);
383 
384  Hash.stringifyResult(Result, Checksum);
385  return llvm::DIFile::CSK_MD5;
386 }
387 
388 Optional<StringRef> CGDebugInfo::getSource(const SourceManager &SM,
389  FileID FID) {
390  if (!CGM.getCodeGenOpts().EmbedSource)
391  return None;
392 
393  bool SourceInvalid = false;
394  StringRef Source = SM.getBufferData(FID, &SourceInvalid);
395 
396  if (SourceInvalid)
397  return None;
398 
399  return Source;
400 }
401 
402 llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
403  if (!Loc.isValid())
404  // If Location is not valid then use main input file.
405  return getOrCreateMainFile();
406 
407  SourceManager &SM = CGM.getContext().getSourceManager();
408  PresumedLoc PLoc = SM.getPresumedLoc(Loc);
409 
410  if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
411  // If the location is not valid then use main input file.
412  return getOrCreateMainFile();
413 
414  // Cache the results.
415  const char *fname = PLoc.getFilename();
416  auto It = DIFileCache.find(fname);
417 
418  if (It != DIFileCache.end()) {
419  // Verify that the information still exists.
420  if (llvm::Metadata *V = It->second)
421  return cast<llvm::DIFile>(V);
422  }
423 
424  SmallString<32> Checksum;
426  computeChecksum(SM.getFileID(Loc), Checksum);
428  if (CSKind)
429  CSInfo.emplace(*CSKind, Checksum);
430 
431  llvm::DIFile *F = DBuilder.createFile(
432  remapDIPath(PLoc.getFilename()), remapDIPath(getCurrentDirname()), CSInfo,
433  getSource(SM, SM.getFileID(Loc)));
434 
435  DIFileCache[fname].reset(F);
436  return F;
437 }
438 
439 llvm::DIFile *CGDebugInfo::getOrCreateMainFile() {
440  return DBuilder.createFile(
441  remapDIPath(TheCU->getFilename()), remapDIPath(TheCU->getDirectory()),
442  TheCU->getFile()->getChecksum(),
443  CGM.getCodeGenOpts().EmbedSource ? TheCU->getSource() : None);
444 }
445 
446 std::string CGDebugInfo::remapDIPath(StringRef Path) const {
447  for (const auto &Entry : DebugPrefixMap)
448  if (Path.startswith(Entry.first))
449  return (Twine(Entry.second) + Path.substr(Entry.first.size())).str();
450  return Path.str();
451 }
452 
453 unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
454  if (Loc.isInvalid() && CurLoc.isInvalid())
455  return 0;
456  SourceManager &SM = CGM.getContext().getSourceManager();
457  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
458  return PLoc.isValid() ? PLoc.getLine() : 0;
459 }
460 
461 unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
462  // We may not want column information at all.
463  if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
464  return 0;
465 
466  // If the location is invalid then use the current column.
467  if (Loc.isInvalid() && CurLoc.isInvalid())
468  return 0;
469  SourceManager &SM = CGM.getContext().getSourceManager();
470  PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
471  return PLoc.isValid() ? PLoc.getColumn() : 0;
472 }
473 
474 StringRef CGDebugInfo::getCurrentDirname() {
475  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
476  return CGM.getCodeGenOpts().DebugCompilationDir;
477 
478  if (!CWDName.empty())
479  return CWDName;
480  SmallString<256> CWD;
481  llvm::sys::fs::current_path(CWD);
482  return CWDName = internString(CWD);
483 }
484 
485 void CGDebugInfo::CreateCompileUnit() {
486  SmallString<32> Checksum;
489 
490  // Should we be asking the SourceManager for the main file name, instead of
491  // accepting it as an argument? This just causes the main file name to
492  // mismatch with source locations and create extra lexical scopes or
493  // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
494  // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
495  // because that's what the SourceManager says)
496 
497  // Get absolute path name.
498  SourceManager &SM = CGM.getContext().getSourceManager();
499  std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
500  if (MainFileName.empty())
501  MainFileName = "<stdin>";
502 
503  // The main file name provided via the "-main-file-name" option contains just
504  // the file name itself with no path information. This file name may have had
505  // a relative path, so we look into the actual file entry for the main
506  // file to determine the real absolute path for the file.
507  std::string MainFileDir;
508  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
509  MainFileDir = remapDIPath(MainFile->getDir()->getName());
510  if (MainFileDir != ".") {
511  llvm::SmallString<1024> MainFileDirSS(MainFileDir);
512  llvm::sys::path::append(MainFileDirSS, MainFileName);
513  MainFileName = MainFileDirSS.str();
514  }
515  // If the main file name provided is identical to the input file name, and
516  // if the input file is a preprocessed source, use the module name for
517  // debug info. The module name comes from the name specified in the first
518  // linemarker if the input is a preprocessed source.
519  if (MainFile->getName() == MainFileName &&
521  MainFile->getName().rsplit('.').second)
522  .isPreprocessed())
523  MainFileName = CGM.getModule().getName().str();
524 
525  CSKind = computeChecksum(SM.getMainFileID(), Checksum);
526  }
527 
528  llvm::dwarf::SourceLanguage LangTag;
529  const LangOptions &LO = CGM.getLangOpts();
530  if (LO.CPlusPlus) {
531  if (LO.ObjC1)
532  LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
533  else
534  LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
535  } else if (LO.ObjC1) {
536  LangTag = llvm::dwarf::DW_LANG_ObjC;
537  } else if (LO.RenderScript) {
538  LangTag = llvm::dwarf::DW_LANG_GOOGLE_RenderScript;
539  } else if (LO.C99) {
540  LangTag = llvm::dwarf::DW_LANG_C99;
541  } else {
542  LangTag = llvm::dwarf::DW_LANG_C89;
543  }
544 
545  std::string Producer = getClangFullVersion();
546 
547  // Figure out which version of the ObjC runtime we have.
548  unsigned RuntimeVers = 0;
549  if (LO.ObjC1)
550  RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
551 
552  llvm::DICompileUnit::DebugEmissionKind EmissionKind;
553  switch (DebugKind) {
556  EmissionKind = llvm::DICompileUnit::NoDebug;
557  break;
559  EmissionKind = llvm::DICompileUnit::LineTablesOnly;
560  break;
563  break;
566  EmissionKind = llvm::DICompileUnit::FullDebug;
567  break;
568  }
569 
570  if (CSKind)
571  CSInfo.emplace(*CSKind, Checksum);
572 
573  // Create new compile unit.
574  // FIXME - Eliminate TheCU.
575  auto &CGOpts = CGM.getCodeGenOpts();
576  TheCU = DBuilder.createCompileUnit(
577  LangTag,
578  DBuilder.createFile(remapDIPath(MainFileName),
579  remapDIPath(getCurrentDirname()), CSInfo,
580  getSource(SM, SM.getMainFileID())),
581  CGOpts.EmitVersionIdentMetadata ? Producer : "",
582  LO.Optimize || CGOpts.PrepareForLTO || CGOpts.PrepareForThinLTO,
583  CGOpts.DwarfDebugFlags, RuntimeVers,
584  CGOpts.EnableSplitDwarf ? "" : CGOpts.SplitDwarfFile, EmissionKind,
585  0 /* DWOid */, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
586  CGM.getTarget().getTriple().isNVPTX()
587  ? llvm::DICompileUnit::DebugNameTableKind::None
588  : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
589  CGOpts.DebugNameTable));
590 }
591 
592 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
593  llvm::dwarf::TypeKind Encoding;
594  StringRef BTName;
595  switch (BT->getKind()) {
596 #define BUILTIN_TYPE(Id, SingletonId)
597 #define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
598 #include "clang/AST/BuiltinTypes.def"
599  case BuiltinType::Dependent:
600  llvm_unreachable("Unexpected builtin type");
601  case BuiltinType::NullPtr:
602  return DBuilder.createNullPtrType();
603  case BuiltinType::Void:
604  return nullptr;
605  case BuiltinType::ObjCClass:
606  if (!ClassTy)
607  ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
608  "objc_class", TheCU,
609  getOrCreateMainFile(), 0);
610  return ClassTy;
611  case BuiltinType::ObjCId: {
612  // typedef struct objc_class *Class;
613  // typedef struct objc_object {
614  // Class isa;
615  // } *id;
616 
617  if (ObjTy)
618  return ObjTy;
619 
620  if (!ClassTy)
621  ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
622  "objc_class", TheCU,
623  getOrCreateMainFile(), 0);
624 
625  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
626 
627  auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
628 
629  ObjTy = DBuilder.createStructType(
630  TheCU, "objc_object", getOrCreateMainFile(), 0, 0, 0,
631  llvm::DINode::FlagZero, nullptr, llvm::DINodeArray());
632 
633  DBuilder.replaceArrays(
634  ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
635  ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0,
636  llvm::DINode::FlagZero, ISATy)));
637  return ObjTy;
638  }
639  case BuiltinType::ObjCSel: {
640  if (!SelTy)
641  SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
642  "objc_selector", TheCU,
643  getOrCreateMainFile(), 0);
644  return SelTy;
645  }
646 
647 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
648  case BuiltinType::Id: \
649  return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
650  SingletonId);
651 #include "clang/Basic/OpenCLImageTypes.def"
652  case BuiltinType::OCLSampler:
653  return getOrCreateStructPtrType("opencl_sampler_t", OCLSamplerDITy);
654  case BuiltinType::OCLEvent:
655  return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
656  case BuiltinType::OCLClkEvent:
657  return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
658  case BuiltinType::OCLQueue:
659  return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
660  case BuiltinType::OCLReserveID:
661  return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
662 
663  case BuiltinType::UChar:
664  case BuiltinType::Char_U:
665  Encoding = llvm::dwarf::DW_ATE_unsigned_char;
666  break;
667  case BuiltinType::Char_S:
668  case BuiltinType::SChar:
669  Encoding = llvm::dwarf::DW_ATE_signed_char;
670  break;
671  case BuiltinType::Char8:
672  case BuiltinType::Char16:
673  case BuiltinType::Char32:
674  Encoding = llvm::dwarf::DW_ATE_UTF;
675  break;
676  case BuiltinType::UShort:
677  case BuiltinType::UInt:
678  case BuiltinType::UInt128:
679  case BuiltinType::ULong:
680  case BuiltinType::WChar_U:
681  case BuiltinType::ULongLong:
682  Encoding = llvm::dwarf::DW_ATE_unsigned;
683  break;
684  case BuiltinType::Short:
685  case BuiltinType::Int:
686  case BuiltinType::Int128:
687  case BuiltinType::Long:
688  case BuiltinType::WChar_S:
689  case BuiltinType::LongLong:
690  Encoding = llvm::dwarf::DW_ATE_signed;
691  break;
692  case BuiltinType::Bool:
693  Encoding = llvm::dwarf::DW_ATE_boolean;
694  break;
695  case BuiltinType::Half:
696  case BuiltinType::Float:
697  case BuiltinType::LongDouble:
698  case BuiltinType::Float16:
699  case BuiltinType::Float128:
700  case BuiltinType::Double:
701  // FIXME: For targets where long double and __float128 have the same size,
702  // they are currently indistinguishable in the debugger without some
703  // special treatment. However, there is currently no consensus on encoding
704  // and this should be updated once a DWARF encoding exists for distinct
705  // floating point types of the same size.
706  Encoding = llvm::dwarf::DW_ATE_float;
707  break;
708  case BuiltinType::ShortAccum:
709  case BuiltinType::Accum:
710  case BuiltinType::LongAccum:
711  case BuiltinType::ShortFract:
712  case BuiltinType::Fract:
713  case BuiltinType::LongFract:
714  case BuiltinType::SatShortFract:
715  case BuiltinType::SatFract:
716  case BuiltinType::SatLongFract:
717  case BuiltinType::SatShortAccum:
718  case BuiltinType::SatAccum:
719  case BuiltinType::SatLongAccum:
720  Encoding = llvm::dwarf::DW_ATE_signed_fixed;
721  break;
722  case BuiltinType::UShortAccum:
723  case BuiltinType::UAccum:
724  case BuiltinType::ULongAccum:
725  case BuiltinType::UShortFract:
726  case BuiltinType::UFract:
727  case BuiltinType::ULongFract:
728  case BuiltinType::SatUShortAccum:
729  case BuiltinType::SatUAccum:
730  case BuiltinType::SatULongAccum:
731  case BuiltinType::SatUShortFract:
732  case BuiltinType::SatUFract:
733  case BuiltinType::SatULongFract:
734  Encoding = llvm::dwarf::DW_ATE_unsigned_fixed;
735  break;
736  }
737 
738  switch (BT->getKind()) {
739  case BuiltinType::Long:
740  BTName = "long int";
741  break;
742  case BuiltinType::LongLong:
743  BTName = "long long int";
744  break;
745  case BuiltinType::ULong:
746  BTName = "long unsigned int";
747  break;
748  case BuiltinType::ULongLong:
749  BTName = "long long unsigned int";
750  break;
751  default:
752  BTName = BT->getName(CGM.getLangOpts());
753  break;
754  }
755  // Bit size and offset of the type.
756  uint64_t Size = CGM.getContext().getTypeSize(BT);
757  return DBuilder.createBasicType(BTName, Size, Encoding);
758 }
759 
760 llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
761  // Bit size and offset of the type.
762  llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
763  if (Ty->isComplexIntegerType())
764  Encoding = llvm::dwarf::DW_ATE_lo_user;
765 
766  uint64_t Size = CGM.getContext().getTypeSize(Ty);
767  return DBuilder.createBasicType("complex", Size, Encoding);
768 }
769 
770 llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
771  llvm::DIFile *Unit) {
773  const Type *T = Qc.strip(Ty);
774 
775  // Ignore these qualifiers for now.
776  Qc.removeObjCGCAttr();
777  Qc.removeAddressSpace();
778  Qc.removeObjCLifetime();
779 
780  // We will create one Derived type for one qualifier and recurse to handle any
781  // additional ones.
782  llvm::dwarf::Tag Tag;
783  if (Qc.hasConst()) {
784  Tag = llvm::dwarf::DW_TAG_const_type;
785  Qc.removeConst();
786  } else if (Qc.hasVolatile()) {
787  Tag = llvm::dwarf::DW_TAG_volatile_type;
788  Qc.removeVolatile();
789  } else if (Qc.hasRestrict()) {
790  Tag = llvm::dwarf::DW_TAG_restrict_type;
791  Qc.removeRestrict();
792  } else {
793  assert(Qc.empty() && "Unknown type qualifier for debug info");
794  return getOrCreateType(QualType(T, 0), Unit);
795  }
796 
797  auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
798 
799  // No need to fill in the Name, Line, Size, Alignment, Offset in case of
800  // CVR derived types.
801  return DBuilder.createQualifiedType(Tag, FromTy);
802 }
803 
804 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
805  llvm::DIFile *Unit) {
806 
807  // The frontend treats 'id' as a typedef to an ObjCObjectType,
808  // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
809  // debug info, we want to emit 'id' in both cases.
810  if (Ty->isObjCQualifiedIdType())
811  return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
812 
813  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
814  Ty->getPointeeType(), Unit);
815 }
816 
817 llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
818  llvm::DIFile *Unit) {
819  return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
820  Ty->getPointeeType(), Unit);
821 }
822 
823 /// \return whether a C++ mangling exists for the type defined by TD.
824 static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
825  switch (TheCU->getSourceLanguage()) {
826  case llvm::dwarf::DW_LANG_C_plus_plus:
827  return true;
828  case llvm::dwarf::DW_LANG_ObjC_plus_plus:
829  return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
830  default:
831  return false;
832  }
833 }
834 
835 // Determines if the debug info for this tag declaration needs a type
836 // identifier. The purpose of the unique identifier is to deduplicate type
837 // information for identical types across TUs. Because of the C++ one definition
838 // rule (ODR), it is valid to assume that the type is defined the same way in
839 // every TU and its debug info is equivalent.
840 //
841 // C does not have the ODR, and it is common for codebases to contain multiple
842 // different definitions of a struct with the same name in different TUs.
843 // Therefore, if the type doesn't have a C++ mangling, don't give it an
844 // identifer. Type information in C is smaller and simpler than C++ type
845 // information, so the increase in debug info size is negligible.
846 //
847 // If the type is not externally visible, it should be unique to the current TU,
848 // and should not need an identifier to participate in type deduplication.
849 // However, when emitting CodeView, the format internally uses these
850 // unique type name identifers for references between debug info. For example,
851 // the method of a class in an anonymous namespace uses the identifer to refer
852 // to its parent class. The Microsoft C++ ABI attempts to provide unique names
853 // for such types, so when emitting CodeView, always use identifiers for C++
854 // types. This may create problems when attempting to emit CodeView when the MS
855 // C++ ABI is not in use.
856 static bool needsTypeIdentifier(const TagDecl *TD, CodeGenModule &CGM,
857  llvm::DICompileUnit *TheCU) {
858  // We only add a type identifier for types with C++ name mangling.
859  if (!hasCXXMangling(TD, TheCU))
860  return false;
861 
862  // Externally visible types with C++ mangling need a type identifier.
863  if (TD->isExternallyVisible())
864  return true;
865 
866  // CodeView types with C++ mangling need a type identifier.
867  if (CGM.getCodeGenOpts().EmitCodeView)
868  return true;
869 
870  return false;
871 }
872 
873 // Returns a unique type identifier string if one exists, or an empty string.
874 static SmallString<256> getTypeIdentifier(const TagType *Ty, CodeGenModule &CGM,
875  llvm::DICompileUnit *TheCU) {
876  SmallString<256> Identifier;
877  const TagDecl *TD = Ty->getDecl();
878 
879  if (!needsTypeIdentifier(TD, CGM, TheCU))
880  return Identifier;
881 
882  // TODO: This is using the RTTI name. Is there a better way to get
883  // a unique string for a type?
884  llvm::raw_svector_ostream Out(Identifier);
886  return Identifier;
887 }
888 
889 /// \return the appropriate DWARF tag for a composite type.
890 static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
891  llvm::dwarf::Tag Tag;
892  if (RD->isStruct() || RD->isInterface())
893  Tag = llvm::dwarf::DW_TAG_structure_type;
894  else if (RD->isUnion())
895  Tag = llvm::dwarf::DW_TAG_union_type;
896  else {
897  // FIXME: This could be a struct type giving a default visibility different
898  // than C++ class type, but needs llvm metadata changes first.
899  assert(RD->isClass());
900  Tag = llvm::dwarf::DW_TAG_class_type;
901  }
902  return Tag;
903 }
904 
905 llvm::DICompositeType *
906 CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
907  llvm::DIScope *Ctx) {
908  const RecordDecl *RD = Ty->getDecl();
909  if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
910  return cast<llvm::DICompositeType>(T);
911  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
912  unsigned Line = getLineNumber(RD->getLocation());
913  StringRef RDName = getClassName(RD);
914 
915  uint64_t Size = 0;
916  uint32_t Align = 0;
917 
918  // Create the type.
919  SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
920  llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
921  getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
922  llvm::DINode::FlagFwdDecl, Identifier);
923  if (CGM.getCodeGenOpts().DebugFwdTemplateParams)
924  if (auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
925  DBuilder.replaceArrays(RetTy, llvm::DINodeArray(),
926  CollectCXXTemplateParams(TSpecial, DefUnit));
927  ReplaceMap.emplace_back(
928  std::piecewise_construct, std::make_tuple(Ty),
929  std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
930  return RetTy;
931 }
932 
933 llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
934  const Type *Ty,
935  QualType PointeeTy,
936  llvm::DIFile *Unit) {
937  // Bit size, align and offset of the type.
938  // Size is always the size of a pointer. We can't use getTypeSize here
939  // because that does not return the correct value for references.
940  unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(PointeeTy);
941  uint64_t Size = CGM.getTarget().getPointerWidth(AddressSpace);
942  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
943  Optional<unsigned> DWARFAddressSpace =
944  CGM.getTarget().getDWARFAddressSpace(AddressSpace);
945 
946  if (Tag == llvm::dwarf::DW_TAG_reference_type ||
947  Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
948  return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
949  Size, Align, DWARFAddressSpace);
950  else
951  return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
952  Align, DWARFAddressSpace);
953 }
954 
955 llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
956  llvm::DIType *&Cache) {
957  if (Cache)
958  return Cache;
959  Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
960  TheCU, getOrCreateMainFile(), 0);
961  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
962  Cache = DBuilder.createPointerType(Cache, Size);
963  return Cache;
964 }
965 
966 uint64_t CGDebugInfo::collectDefaultElementTypesForBlockPointer(
967  const BlockPointerType *Ty, llvm::DIFile *Unit, llvm::DIDerivedType *DescTy,
968  unsigned LineNo, SmallVectorImpl<llvm::Metadata *> &EltTys) {
969  QualType FType;
970 
971  // Advanced by calls to CreateMemberType in increments of FType, then
972  // returned as the overall size of the default elements.
973  uint64_t FieldOffset = 0;
974 
975  // Blocks in OpenCL have unique constraints which make the standard fields
976  // redundant while requiring size and align fields for enqueue_kernel. See
977  // initializeForBlockHeader in CGBlocks.cpp
978  if (CGM.getLangOpts().OpenCL) {
979  FType = CGM.getContext().IntTy;
980  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
981  EltTys.push_back(CreateMemberType(Unit, FType, "__align", &FieldOffset));
982  } else {
983  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
984  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
985  FType = CGM.getContext().IntTy;
986  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
987  EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
988  FType = CGM.getContext().getPointerType(Ty->getPointeeType());
989  EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
990  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
991  uint64_t FieldSize = CGM.getContext().getTypeSize(Ty);
992  uint32_t FieldAlign = CGM.getContext().getTypeAlign(Ty);
993  EltTys.push_back(DBuilder.createMemberType(
994  Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign,
995  FieldOffset, llvm::DINode::FlagZero, DescTy));
996  FieldOffset += FieldSize;
997  }
998 
999  return FieldOffset;
1000 }
1001 
1002 llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
1003  llvm::DIFile *Unit) {
1005  QualType FType;
1006  uint64_t FieldOffset;
1007  llvm::DINodeArray Elements;
1008 
1009  FieldOffset = 0;
1010  FType = CGM.getContext().UnsignedLongTy;
1011  EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
1012  EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
1013 
1014  Elements = DBuilder.getOrCreateArray(EltTys);
1015  EltTys.clear();
1016 
1017  llvm::DINode::DIFlags Flags = llvm::DINode::FlagAppleBlock;
1018 
1019  auto *EltTy =
1020  DBuilder.createStructType(Unit, "__block_descriptor", nullptr, 0,
1021  FieldOffset, 0, Flags, nullptr, Elements);
1022 
1023  // Bit size, align and offset of the type.
1024  uint64_t Size = CGM.getContext().getTypeSize(Ty);
1025 
1026  auto *DescTy = DBuilder.createPointerType(EltTy, Size);
1027 
1028  FieldOffset = collectDefaultElementTypesForBlockPointer(Ty, Unit, DescTy,
1029  0, EltTys);
1030 
1031  Elements = DBuilder.getOrCreateArray(EltTys);
1032 
1033  // The __block_literal_generic structs are marked with a special
1034  // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
1035  // the debugger needs to know about. To allow type uniquing, emit
1036  // them without a name or a location.
1037  EltTy = DBuilder.createStructType(Unit, "", nullptr, 0, FieldOffset, 0,
1038  Flags, nullptr, Elements);
1039 
1040  return DBuilder.createPointerType(EltTy, Size);
1041 }
1042 
1043 llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
1044  llvm::DIFile *Unit) {
1045  assert(Ty->isTypeAlias());
1046  llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
1047 
1048  SmallString<128> NS;
1049  llvm::raw_svector_ostream OS(NS);
1050  Ty->getTemplateName().print(OS, getPrintingPolicy(), /*qualified*/ false);
1051  printTemplateArgumentList(OS, Ty->template_arguments(), getPrintingPolicy());
1052 
1053  auto *AliasDecl =
1054  cast<TypeAliasTemplateDecl>(Ty->getTemplateName().getAsTemplateDecl())
1055  ->getTemplatedDecl();
1056 
1057  SourceLocation Loc = AliasDecl->getLocation();
1058  return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
1059  getLineNumber(Loc),
1060  getDeclContextDescriptor(AliasDecl));
1061 }
1062 
1063 llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
1064  llvm::DIFile *Unit) {
1065  // We don't set size information, but do specify where the typedef was
1066  // declared.
1067  SourceLocation Loc = Ty->getDecl()->getLocation();
1068 
1069  // Typedefs are derived from some other type.
1070  return DBuilder.createTypedef(
1071  getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
1072  Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
1073  getDeclContextDescriptor(Ty->getDecl()));
1074 }
1075 
1076 static unsigned getDwarfCC(CallingConv CC) {
1077  switch (CC) {
1078  case CC_C:
1079  // Avoid emitting DW_AT_calling_convention if the C convention was used.
1080  return 0;
1081 
1082  case CC_X86StdCall:
1083  return llvm::dwarf::DW_CC_BORLAND_stdcall;
1084  case CC_X86FastCall:
1085  return llvm::dwarf::DW_CC_BORLAND_msfastcall;
1086  case CC_X86ThisCall:
1087  return llvm::dwarf::DW_CC_BORLAND_thiscall;
1088  case CC_X86VectorCall:
1089  return llvm::dwarf::DW_CC_LLVM_vectorcall;
1090  case CC_X86Pascal:
1091  return llvm::dwarf::DW_CC_BORLAND_pascal;
1092  case CC_Win64:
1093  return llvm::dwarf::DW_CC_LLVM_Win64;
1094  case CC_X86_64SysV:
1095  return llvm::dwarf::DW_CC_LLVM_X86_64SysV;
1096  case CC_AAPCS:
1097  return llvm::dwarf::DW_CC_LLVM_AAPCS;
1098  case CC_AAPCS_VFP:
1099  return llvm::dwarf::DW_CC_LLVM_AAPCS_VFP;
1100  case CC_IntelOclBicc:
1101  return llvm::dwarf::DW_CC_LLVM_IntelOclBicc;
1102  case CC_SpirFunction:
1103  return llvm::dwarf::DW_CC_LLVM_SpirFunction;
1104  case CC_OpenCLKernel:
1105  return llvm::dwarf::DW_CC_LLVM_OpenCLKernel;
1106  case CC_Swift:
1107  return llvm::dwarf::DW_CC_LLVM_Swift;
1108  case CC_PreserveMost:
1109  return llvm::dwarf::DW_CC_LLVM_PreserveMost;
1110  case CC_PreserveAll:
1111  return llvm::dwarf::DW_CC_LLVM_PreserveAll;
1112  case CC_X86RegCall:
1113  return llvm::dwarf::DW_CC_LLVM_X86RegCall;
1114  }
1115  return 0;
1116 }
1117 
1118 llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
1119  llvm::DIFile *Unit) {
1121 
1122  // Add the result type at least.
1123  EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
1124 
1125  // Set up remainder of arguments if there is a prototype.
1126  // otherwise emit it as a variadic function.
1127  if (isa<FunctionNoProtoType>(Ty))
1128  EltTys.push_back(DBuilder.createUnspecifiedParameter());
1129  else if (const auto *FPT = dyn_cast<FunctionProtoType>(Ty)) {
1130  for (const QualType &ParamType : FPT->param_types())
1131  EltTys.push_back(getOrCreateType(ParamType, Unit));
1132  if (FPT->isVariadic())
1133  EltTys.push_back(DBuilder.createUnspecifiedParameter());
1134  }
1135 
1136  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
1137  return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
1138  getDwarfCC(Ty->getCallConv()));
1139 }
1140 
1141 /// Convert an AccessSpecifier into the corresponding DINode flag.
1142 /// As an optimization, return 0 if the access specifier equals the
1143 /// default for the containing type.
1144 static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access,
1145  const RecordDecl *RD) {
1147  if (RD && RD->isClass())
1148  Default = clang::AS_private;
1149  else if (RD && (RD->isStruct() || RD->isUnion()))
1150  Default = clang::AS_public;
1151 
1152  if (Access == Default)
1153  return llvm::DINode::FlagZero;
1154 
1155  switch (Access) {
1156  case clang::AS_private:
1157  return llvm::DINode::FlagPrivate;
1158  case clang::AS_protected:
1159  return llvm::DINode::FlagProtected;
1160  case clang::AS_public:
1161  return llvm::DINode::FlagPublic;
1162  case clang::AS_none:
1163  return llvm::DINode::FlagZero;
1164  }
1165  llvm_unreachable("unexpected access enumerator");
1166 }
1167 
1168 llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
1169  llvm::DIScope *RecordTy,
1170  const RecordDecl *RD) {
1171  StringRef Name = BitFieldDecl->getName();
1172  QualType Ty = BitFieldDecl->getType();
1173  SourceLocation Loc = BitFieldDecl->getLocation();
1174  llvm::DIFile *VUnit = getOrCreateFile(Loc);
1175  llvm::DIType *DebugType = getOrCreateType(Ty, VUnit);
1176 
1177  // Get the location for the field.
1178  llvm::DIFile *File = getOrCreateFile(Loc);
1179  unsigned Line = getLineNumber(Loc);
1180 
1181  const CGBitFieldInfo &BitFieldInfo =
1182  CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
1183  uint64_t SizeInBits = BitFieldInfo.Size;
1184  assert(SizeInBits > 0 && "found named 0-width bitfield");
1185  uint64_t StorageOffsetInBits =
1186  CGM.getContext().toBits(BitFieldInfo.StorageOffset);
1187  uint64_t Offset = BitFieldInfo.Offset;
1188  // The bit offsets for big endian machines are reversed for big
1189  // endian target, compensate for that as the DIDerivedType requires
1190  // un-reversed offsets.
1191  if (CGM.getDataLayout().isBigEndian())
1192  Offset = BitFieldInfo.StorageSize - BitFieldInfo.Size - Offset;
1193  uint64_t OffsetInBits = StorageOffsetInBits + Offset;
1194  llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
1195  return DBuilder.createBitFieldMemberType(
1196  RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
1197  Flags, DebugType);
1198 }
1199 
1200 llvm::DIType *
1201 CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
1202  AccessSpecifier AS, uint64_t offsetInBits,
1203  uint32_t AlignInBits, llvm::DIFile *tunit,
1204  llvm::DIScope *scope, const RecordDecl *RD) {
1205  llvm::DIType *debugType = getOrCreateType(type, tunit);
1206 
1207  // Get the location for the field.
1208  llvm::DIFile *file = getOrCreateFile(loc);
1209  unsigned line = getLineNumber(loc);
1210 
1211  uint64_t SizeInBits = 0;
1212  auto Align = AlignInBits;
1213  if (!type->isIncompleteArrayType()) {
1214  TypeInfo TI = CGM.getContext().getTypeInfo(type);
1215  SizeInBits = TI.Width;
1216  if (!Align)
1217  Align = getTypeAlignIfRequired(type, CGM.getContext());
1218  }
1219 
1220  llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
1221  return DBuilder.createMemberType(scope, name, file, line, SizeInBits, Align,
1222  offsetInBits, flags, debugType);
1223 }
1224 
1225 void CGDebugInfo::CollectRecordLambdaFields(
1226  const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
1227  llvm::DIType *RecordTy) {
1228  // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
1229  // has the name and the location of the variable so we should iterate over
1230  // both concurrently.
1231  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
1232  RecordDecl::field_iterator Field = CXXDecl->field_begin();
1233  unsigned fieldno = 0;
1235  E = CXXDecl->captures_end();
1236  I != E; ++I, ++Field, ++fieldno) {
1237  const LambdaCapture &C = *I;
1238  if (C.capturesVariable()) {
1239  SourceLocation Loc = C.getLocation();
1240  assert(!Field->isBitField() && "lambdas don't have bitfield members!");
1241  VarDecl *V = C.getCapturedVar();
1242  StringRef VName = V->getName();
1243  llvm::DIFile *VUnit = getOrCreateFile(Loc);
1244  auto Align = getDeclAlignIfRequired(V, CGM.getContext());
1245  llvm::DIType *FieldType = createFieldType(
1246  VName, Field->getType(), Loc, Field->getAccess(),
1247  layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
1248  elements.push_back(FieldType);
1249  } else if (C.capturesThis()) {
1250  // TODO: Need to handle 'this' in some way by probably renaming the
1251  // this of the lambda class and having a field member of 'this' or
1252  // by using AT_object_pointer for the function and having that be
1253  // used as 'this' for semantic references.
1254  FieldDecl *f = *Field;
1255  llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
1256  QualType type = f->getType();
1257  llvm::DIType *fieldType = createFieldType(
1258  "this", type, f->getLocation(), f->getAccess(),
1259  layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
1260 
1261  elements.push_back(fieldType);
1262  }
1263  }
1264 }
1265 
1266 llvm::DIDerivedType *
1267 CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
1268  const RecordDecl *RD) {
1269  // Create the descriptor for the static variable, with or without
1270  // constant initializers.
1271  Var = Var->getCanonicalDecl();
1272  llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
1273  llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
1274 
1275  unsigned LineNumber = getLineNumber(Var->getLocation());
1276  StringRef VName = Var->getName();
1277  llvm::Constant *C = nullptr;
1278  if (Var->getInit()) {
1279  const APValue *Value = Var->evaluateValue();
1280  if (Value) {
1281  if (Value->isInt())
1282  C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
1283  if (Value->isFloat())
1284  C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
1285  }
1286  }
1287 
1288  llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
1289  auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
1290  llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
1291  RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
1292  StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
1293  return GV;
1294 }
1295 
1296 void CGDebugInfo::CollectRecordNormalField(
1297  const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
1298  SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
1299  const RecordDecl *RD) {
1300  StringRef name = field->getName();
1301  QualType type = field->getType();
1302 
1303  // Ignore unnamed fields unless they're anonymous structs/unions.
1304  if (name.empty() && !type->isRecordType())
1305  return;
1306 
1307  llvm::DIType *FieldType;
1308  if (field->isBitField()) {
1309  FieldType = createBitFieldType(field, RecordTy, RD);
1310  } else {
1311  auto Align = getDeclAlignIfRequired(field, CGM.getContext());
1312  FieldType =
1313  createFieldType(name, type, field->getLocation(), field->getAccess(),
1314  OffsetInBits, Align, tunit, RecordTy, RD);
1315  }
1316 
1317  elements.push_back(FieldType);
1318 }
1319 
1320 void CGDebugInfo::CollectRecordNestedType(
1321  const TypeDecl *TD, SmallVectorImpl<llvm::Metadata *> &elements) {
1322  QualType Ty = CGM.getContext().getTypeDeclType(TD);
1323  // Injected class names are not considered nested records.
1324  if (isa<InjectedClassNameType>(Ty))
1325  return;
1326  SourceLocation Loc = TD->getLocation();
1327  llvm::DIType *nestedType = getOrCreateType(Ty, getOrCreateFile(Loc));
1328  elements.push_back(nestedType);
1329 }
1330 
1331 void CGDebugInfo::CollectRecordFields(
1332  const RecordDecl *record, llvm::DIFile *tunit,
1334  llvm::DICompositeType *RecordTy) {
1335  const auto *CXXDecl = dyn_cast<CXXRecordDecl>(record);
1336 
1337  if (CXXDecl && CXXDecl->isLambda())
1338  CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
1339  else {
1340  const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
1341 
1342  // Field number for non-static fields.
1343  unsigned fieldNo = 0;
1344 
1345  // Static and non-static members should appear in the same order as
1346  // the corresponding declarations in the source program.
1347  for (const auto *I : record->decls())
1348  if (const auto *V = dyn_cast<VarDecl>(I)) {
1349  if (V->hasAttr<NoDebugAttr>())
1350  continue;
1351 
1352  // Skip variable template specializations when emitting CodeView. MSVC
1353  // doesn't emit them.
1354  if (CGM.getCodeGenOpts().EmitCodeView &&
1355  isa<VarTemplateSpecializationDecl>(V))
1356  continue;
1357 
1358  // Reuse the existing static member declaration if one exists
1359  auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
1360  if (MI != StaticDataMemberCache.end()) {
1361  assert(MI->second &&
1362  "Static data member declaration should still exist");
1363  elements.push_back(MI->second);
1364  } else {
1365  auto Field = CreateRecordStaticField(V, RecordTy, record);
1366  elements.push_back(Field);
1367  }
1368  } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
1369  CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
1370  elements, RecordTy, record);
1371 
1372  // Bump field number for next field.
1373  ++fieldNo;
1374  } else if (CGM.getCodeGenOpts().EmitCodeView) {
1375  // Debug info for nested types is included in the member list only for
1376  // CodeView.
1377  if (const auto *nestedType = dyn_cast<TypeDecl>(I))
1378  if (!nestedType->isImplicit() &&
1379  nestedType->getDeclContext() == record)
1380  CollectRecordNestedType(nestedType, elements);
1381  }
1382  }
1383 }
1384 
1385 llvm::DISubroutineType *
1386 CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
1387  llvm::DIFile *Unit) {
1388  const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
1389  if (Method->isStatic())
1390  return cast_or_null<llvm::DISubroutineType>(
1391  getOrCreateType(QualType(Func, 0), Unit));
1392  return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
1393  Func, Unit);
1394 }
1395 
1396 llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
1397  QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
1398  // Add "this" pointer.
1399  llvm::DITypeRefArray Args(
1400  cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
1401  ->getTypeArray());
1402  assert(Args.size() && "Invalid number of arguments!");
1403 
1405 
1406  // First element is always return type. For 'void' functions it is NULL.
1407  Elts.push_back(Args[0]);
1408 
1409  // "this" pointer is always first argument.
1410  const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
1411  if (isa<ClassTemplateSpecializationDecl>(RD)) {
1412  // Create pointer type directly in this case.
1413  const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
1414  QualType PointeeTy = ThisPtrTy->getPointeeType();
1415  unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1416  uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1417  auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
1418  llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
1419  llvm::DIType *ThisPtrType =
1420  DBuilder.createPointerType(PointeeType, Size, Align);
1421  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1422  // TODO: This and the artificial type below are misleading, the
1423  // types aren't artificial the argument is, but the current
1424  // metadata doesn't represent that.
1425  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1426  Elts.push_back(ThisPtrType);
1427  } else {
1428  llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
1429  TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1430  ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1431  Elts.push_back(ThisPtrType);
1432  }
1433 
1434  // Copy rest of the arguments.
1435  for (unsigned i = 1, e = Args.size(); i != e; ++i)
1436  Elts.push_back(Args[i]);
1437 
1438  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
1439 
1440  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1441  if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
1442  Flags |= llvm::DINode::FlagLValueReference;
1443  if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
1444  Flags |= llvm::DINode::FlagRValueReference;
1445 
1446  return DBuilder.createSubroutineType(EltTypeArray, Flags,
1447  getDwarfCC(Func->getCallConv()));
1448 }
1449 
1450 /// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1451 /// inside a function.
1452 static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1453  if (const auto *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1454  return isFunctionLocalClass(NRD);
1455  if (isa<FunctionDecl>(RD->getDeclContext()))
1456  return true;
1457  return false;
1458 }
1459 
1460 llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
1461  const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
1462  bool IsCtorOrDtor =
1463  isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1464 
1465  StringRef MethodName = getFunctionName(Method);
1466  llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
1467 
1468  // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1469  // make sense to give a single ctor/dtor a linkage name.
1470  StringRef MethodLinkageName;
1471  // FIXME: 'isFunctionLocalClass' seems like an arbitrary/unintentional
1472  // property to use here. It may've been intended to model "is non-external
1473  // type" but misses cases of non-function-local but non-external classes such
1474  // as those in anonymous namespaces as well as the reverse - external types
1475  // that are function local, such as those in (non-local) inline functions.
1476  if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1477  MethodLinkageName = CGM.getMangledName(Method);
1478 
1479  // Get the location for the method.
1480  llvm::DIFile *MethodDefUnit = nullptr;
1481  unsigned MethodLine = 0;
1482  if (!Method->isImplicit()) {
1483  MethodDefUnit = getOrCreateFile(Method->getLocation());
1484  MethodLine = getLineNumber(Method->getLocation());
1485  }
1486 
1487  // Collect virtual method info.
1488  llvm::DIType *ContainingType = nullptr;
1489  unsigned Virtuality = 0;
1490  unsigned VIndex = 0;
1491  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1492  int ThisAdjustment = 0;
1493 
1494  if (Method->isVirtual()) {
1495  if (Method->isPure())
1496  Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1497  else
1498  Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1499 
1500  if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1501  // It doesn't make sense to give a virtual destructor a vtable index,
1502  // since a single destructor has two entries in the vtable.
1503  if (!isa<CXXDestructorDecl>(Method))
1504  VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
1505  } else {
1506  // Emit MS ABI vftable information. There is only one entry for the
1507  // deleting dtor.
1508  const auto *DD = dyn_cast<CXXDestructorDecl>(Method);
1509  GlobalDecl GD = DD ? GlobalDecl(DD, Dtor_Deleting) : GlobalDecl(Method);
1511  CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1512  VIndex = ML.Index;
1513 
1514  // CodeView only records the vftable offset in the class that introduces
1515  // the virtual method. This is possible because, unlike Itanium, the MS
1516  // C++ ABI does not include all virtual methods from non-primary bases in
1517  // the vtable for the most derived class. For example, if C inherits from
1518  // A and B, C's primary vftable will not include B's virtual methods.
1519  if (Method->size_overridden_methods() == 0)
1520  Flags |= llvm::DINode::FlagIntroducedVirtual;
1521 
1522  // The 'this' adjustment accounts for both the virtual and non-virtual
1523  // portions of the adjustment. Presumably the debugger only uses it when
1524  // it knows the dynamic type of an object.
1525  ThisAdjustment = CGM.getCXXABI()
1526  .getVirtualFunctionPrologueThisAdjustment(GD)
1527  .getQuantity();
1528  }
1529  ContainingType = RecordTy;
1530  }
1531 
1532  if (Method->isStatic())
1533  Flags |= llvm::DINode::FlagStaticMember;
1534  if (Method->isImplicit())
1535  Flags |= llvm::DINode::FlagArtificial;
1536  Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
1537  if (const auto *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1538  if (CXXC->isExplicit())
1539  Flags |= llvm::DINode::FlagExplicit;
1540  } else if (const auto *CXXC = dyn_cast<CXXConversionDecl>(Method)) {
1541  if (CXXC->isExplicit())
1542  Flags |= llvm::DINode::FlagExplicit;
1543  }
1544  if (Method->hasPrototype())
1545  Flags |= llvm::DINode::FlagPrototyped;
1546  if (Method->getRefQualifier() == RQ_LValue)
1547  Flags |= llvm::DINode::FlagLValueReference;
1548  if (Method->getRefQualifier() == RQ_RValue)
1549  Flags |= llvm::DINode::FlagRValueReference;
1550 
1551  llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1552  llvm::DISubprogram *SP = DBuilder.createMethod(
1553  RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
1554  MethodTy, /*isLocalToUnit=*/false, /*isDefinition=*/false, Virtuality,
1555  VIndex, ThisAdjustment, ContainingType, Flags, CGM.getLangOpts().Optimize,
1556  TParamsArray.get());
1557 
1558  SPCache[Method->getCanonicalDecl()].reset(SP);
1559 
1560  return SP;
1561 }
1562 
1563 void CGDebugInfo::CollectCXXMemberFunctions(
1564  const CXXRecordDecl *RD, llvm::DIFile *Unit,
1565  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
1566 
1567  // Since we want more than just the individual member decls if we
1568  // have templated functions iterate over every declaration to gather
1569  // the functions.
1570  for (const auto *I : RD->decls()) {
1571  const auto *Method = dyn_cast<CXXMethodDecl>(I);
1572  // If the member is implicit, don't add it to the member list. This avoids
1573  // the member being added to type units by LLVM, while still allowing it
1574  // to be emitted into the type declaration/reference inside the compile
1575  // unit.
1576  // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
1577  // FIXME: Handle Using(Shadow?)Decls here to create
1578  // DW_TAG_imported_declarations inside the class for base decls brought into
1579  // derived classes. GDB doesn't seem to notice/leverage these when I tried
1580  // it, so I'm not rushing to fix this. (GCC seems to produce them, if
1581  // referenced)
1582  if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
1583  continue;
1584 
1585  if (Method->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
1586  continue;
1587 
1588  // Reuse the existing member function declaration if it exists.
1589  // It may be associated with the declaration of the type & should be
1590  // reused as we're building the definition.
1591  //
1592  // This situation can arise in the vtable-based debug info reduction where
1593  // implicit members are emitted in a non-vtable TU.
1594  auto MI = SPCache.find(Method->getCanonicalDecl());
1595  EltTys.push_back(MI == SPCache.end()
1596  ? CreateCXXMemberFunction(Method, Unit, RecordTy)
1597  : static_cast<llvm::Metadata *>(MI->second));
1598  }
1599 }
1600 
1601 void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1603  llvm::DIType *RecordTy) {
1605  CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->bases(), SeenTypes,
1606  llvm::DINode::FlagZero);
1607 
1608  // If we are generating CodeView debug info, we also need to emit records for
1609  // indirect virtual base classes.
1610  if (CGM.getCodeGenOpts().EmitCodeView) {
1611  CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->vbases(), SeenTypes,
1612  llvm::DINode::FlagIndirectVirtualBase);
1613  }
1614 }
1615 
1616 void CGDebugInfo::CollectCXXBasesAux(
1617  const CXXRecordDecl *RD, llvm::DIFile *Unit,
1618  SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
1621  llvm::DINode::DIFlags StartingFlags) {
1622  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1623  for (const auto &BI : Bases) {
1624  const auto *Base =
1625  cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
1626  if (!SeenTypes.insert(Base).second)
1627  continue;
1628  auto *BaseTy = getOrCreateType(BI.getType(), Unit);
1629  llvm::DINode::DIFlags BFlags = StartingFlags;
1630  uint64_t BaseOffset;
1631  uint32_t VBPtrOffset = 0;
1632 
1633  if (BI.isVirtual()) {
1634  if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1635  // virtual base offset offset is -ve. The code generator emits dwarf
1636  // expression where it expects +ve number.
1637  BaseOffset = 0 - CGM.getItaniumVTableContext()
1638  .getVirtualBaseOffsetOffset(RD, Base)
1639  .getQuantity();
1640  } else {
1641  // In the MS ABI, store the vbtable offset, which is analogous to the
1642  // vbase offset offset in Itanium.
1643  BaseOffset =
1644  4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
1645  VBPtrOffset = CGM.getContext()
1646  .getASTRecordLayout(RD)
1647  .getVBPtrOffset()
1648  .getQuantity();
1649  }
1650  BFlags |= llvm::DINode::FlagVirtual;
1651  } else
1652  BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1653  // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1654  // BI->isVirtual() and bits when not.
1655 
1656  BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
1657  llvm::DIType *DTy = DBuilder.createInheritance(RecordTy, BaseTy, BaseOffset,
1658  VBPtrOffset, BFlags);
1659  EltTys.push_back(DTy);
1660  }
1661 }
1662 
1663 llvm::DINodeArray
1664 CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
1666  llvm::DIFile *Unit) {
1667  SmallVector<llvm::Metadata *, 16> TemplateParams;
1668  for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1669  const TemplateArgument &TA = TAList[i];
1670  StringRef Name;
1671  if (TPList)
1672  Name = TPList->getParam(i)->getName();
1673  switch (TA.getKind()) {
1674  case TemplateArgument::Type: {
1675  llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
1676  TemplateParams.push_back(
1677  DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
1678  } break;
1680  llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
1681  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1682  TheCU, Name, TTy,
1683  llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
1684  } break;
1686  const ValueDecl *D = TA.getAsDecl();
1687  QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
1688  llvm::DIType *TTy = getOrCreateType(T, Unit);
1689  llvm::Constant *V = nullptr;
1690  const CXXMethodDecl *MD;
1691  // Variable pointer template parameters have a value that is the address
1692  // of the variable.
1693  if (const auto *VD = dyn_cast<VarDecl>(D))
1694  V = CGM.GetAddrOfGlobalVar(VD);
1695  // Member function pointers have special support for building them, though
1696  // this is currently unsupported in LLVM CodeGen.
1697  else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
1698  V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
1699  else if (const auto *FD = dyn_cast<FunctionDecl>(D))
1700  V = CGM.GetAddrOfFunction(FD);
1701  // Member data pointers have special handling too to compute the fixed
1702  // offset within the object.
1703  else if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr())) {
1704  // These five lines (& possibly the above member function pointer
1705  // handling) might be able to be refactored to use similar code in
1706  // CodeGenModule::getMemberPointerConstant
1707  uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1708  CharUnits chars =
1709  CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
1710  V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
1711  }
1712  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1713  TheCU, Name, TTy,
1714  cast_or_null<llvm::Constant>(V->stripPointerCasts())));
1715  } break;
1717  QualType T = TA.getNullPtrType();
1718  llvm::DIType *TTy = getOrCreateType(T, Unit);
1719  llvm::Constant *V = nullptr;
1720  // Special case member data pointer null values since they're actually -1
1721  // instead of zero.
1722  if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr()))
1723  // But treat member function pointers as simple zero integers because
1724  // it's easier than having a special case in LLVM's CodeGen. If LLVM
1725  // CodeGen grows handling for values of non-null member function
1726  // pointers then perhaps we could remove this special case and rely on
1727  // EmitNullMemberPointer for member function pointers.
1728  if (MPT->isMemberDataPointer())
1729  V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1730  if (!V)
1731  V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1732  TemplateParams.push_back(
1733  DBuilder.createTemplateValueParameter(TheCU, Name, TTy, V));
1734  } break;
1736  TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
1737  TheCU, Name, nullptr,
1739  break;
1741  TemplateParams.push_back(DBuilder.createTemplateParameterPack(
1742  TheCU, Name, nullptr,
1743  CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
1744  break;
1746  const Expr *E = TA.getAsExpr();
1747  QualType T = E->getType();
1748  if (E->isGLValue())
1749  T = CGM.getContext().getLValueReferenceType(T);
1750  llvm::Constant *V = ConstantEmitter(CGM).emitAbstract(E, T);
1751  assert(V && "Expression in template argument isn't constant");
1752  llvm::DIType *TTy = getOrCreateType(T, Unit);
1753  TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1754  TheCU, Name, TTy, V->stripPointerCasts()));
1755  } break;
1756  // And the following should never occur:
1759  llvm_unreachable(
1760  "These argument types shouldn't exist in concrete types");
1761  }
1762  }
1763  return DBuilder.getOrCreateArray(TemplateParams);
1764 }
1765 
1766 llvm::DINodeArray
1767 CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
1768  llvm::DIFile *Unit) {
1769  if (FD->getTemplatedKind() ==
1772  ->getTemplate()
1774  return CollectTemplateParams(
1775  TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1776  }
1777  return llvm::DINodeArray();
1778 }
1779 
1780 llvm::DINodeArray CGDebugInfo::CollectVarTemplateParams(const VarDecl *VL,
1781  llvm::DIFile *Unit) {
1782  if (auto *TS = dyn_cast<VarTemplateSpecializationDecl>(VL)) {
1783  auto T = TS->getSpecializedTemplateOrPartial();
1784  auto TA = TS->getTemplateArgs().asArray();
1785  // Collect parameters for a partial specialization
1786  if (T.is<VarTemplatePartialSpecializationDecl *>()) {
1787  const TemplateParameterList *TList =
1789  ->getTemplateParameters();
1790  return CollectTemplateParams(TList, TA, Unit);
1791  }
1792 
1793  // Collect parameters for an explicit specialization
1794  if (T.is<VarTemplateDecl *>()) {
1795  const TemplateParameterList *TList = T.get<VarTemplateDecl *>()
1796  ->getTemplateParameters();
1797  return CollectTemplateParams(TList, TA, Unit);
1798  }
1799  }
1800  return llvm::DINodeArray();
1801 }
1802 
1803 llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
1804  const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
1805  // Always get the full list of parameters, not just the ones from
1806  // the specialization.
1807  TemplateParameterList *TPList =
1809  const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
1810  return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1811 }
1812 
1813 llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
1814  if (VTablePtrType)
1815  return VTablePtrType;
1816 
1817  ASTContext &Context = CGM.getContext();
1818 
1819  /* Function type */
1820  llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
1821  llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
1822  llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
1823  unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1824  unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1825  Optional<unsigned> DWARFAddressSpace =
1826  CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
1827 
1828  llvm::DIType *vtbl_ptr_type = DBuilder.createPointerType(
1829  SubTy, Size, 0, DWARFAddressSpace, "__vtbl_ptr_type");
1830  VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1831  return VTablePtrType;
1832 }
1833 
1834 StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1835  // Copy the gdb compatible name on the side and use its reference.
1836  return internString("_vptr$", RD->getNameAsString());
1837 }
1838 
1839 void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1841  llvm::DICompositeType *RecordTy) {
1842  // If this class is not dynamic then there is not any vtable info to collect.
1843  if (!RD->isDynamicClass())
1844  return;
1845 
1846  // Don't emit any vtable shape or vptr info if this class doesn't have an
1847  // extendable vfptr. This can happen if the class doesn't have virtual
1848  // methods, or in the MS ABI if those virtual methods only come from virtually
1849  // inherited bases.
1850  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1851  if (!RL.hasExtendableVFPtr())
1852  return;
1853 
1854  // CodeView needs to know how large the vtable of every dynamic class is, so
1855  // emit a special named pointer type into the element list. The vptr type
1856  // points to this type as well.
1857  llvm::DIType *VPtrTy = nullptr;
1858  bool NeedVTableShape = CGM.getCodeGenOpts().EmitCodeView &&
1859  CGM.getTarget().getCXXABI().isMicrosoft();
1860  if (NeedVTableShape) {
1861  uint64_t PtrWidth =
1862  CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1863  const VTableLayout &VFTLayout =
1864  CGM.getMicrosoftVTableContext().getVFTableLayout(RD, CharUnits::Zero());
1865  unsigned VSlotCount =
1866  VFTLayout.vtable_components().size() - CGM.getLangOpts().RTTIData;
1867  unsigned VTableWidth = PtrWidth * VSlotCount;
1868  unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1869  Optional<unsigned> DWARFAddressSpace =
1870  CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
1871 
1872  // Create a very wide void* type and insert it directly in the element list.
1873  llvm::DIType *VTableType = DBuilder.createPointerType(
1874  nullptr, VTableWidth, 0, DWARFAddressSpace, "__vtbl_ptr_type");
1875  EltTys.push_back(VTableType);
1876 
1877  // The vptr is a pointer to this special vtable type.
1878  VPtrTy = DBuilder.createPointerType(VTableType, PtrWidth);
1879  }
1880 
1881  // If there is a primary base then the artificial vptr member lives there.
1882  if (RL.getPrimaryBase())
1883  return;
1884 
1885  if (!VPtrTy)
1886  VPtrTy = getOrCreateVTablePtrType(Unit);
1887 
1888  unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1889  llvm::DIType *VPtrMember =
1890  DBuilder.createMemberType(Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
1891  llvm::DINode::FlagArtificial, VPtrTy);
1892  EltTys.push_back(VPtrMember);
1893 }
1894 
1896  SourceLocation Loc) {
1897  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
1898  llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
1899  return T;
1900 }
1901 
1903  SourceLocation Loc) {
1904  return getOrCreateStandaloneType(D, Loc);
1905 }
1906 
1908  SourceLocation Loc) {
1909  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
1910  assert(!D.isNull() && "null type");
1911  llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
1912  assert(T && "could not create debug info for type");
1913 
1914  RetainedTypes.push_back(D.getAsOpaquePtr());
1915  return T;
1916 }
1917 
1919  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
1920  return;
1921  QualType Ty = CGM.getContext().getEnumType(ED);
1922  void *TyPtr = Ty.getAsOpaquePtr();
1923  auto I = TypeCache.find(TyPtr);
1924  if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
1925  return;
1926  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
1927  assert(!Res->isForwardDecl());
1928  TypeCache[TyPtr].reset(Res);
1929 }
1930 
1932  if (DebugKind > codegenoptions::LimitedDebugInfo ||
1933  !CGM.getLangOpts().CPlusPlus)
1934  completeRequiredType(RD);
1935 }
1936 
1937 /// Return true if the class or any of its methods are marked dllimport.
1938 static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD) {
1939  if (RD->hasAttr<DLLImportAttr>())
1940  return true;
1941  for (const CXXMethodDecl *MD : RD->methods())
1942  if (MD->hasAttr<DLLImportAttr>())
1943  return true;
1944  return false;
1945 }
1946 
1947 /// Does a type definition exist in an imported clang module?
1948 static bool isDefinedInClangModule(const RecordDecl *RD) {
1949  // Only definitions that where imported from an AST file come from a module.
1950  if (!RD || !RD->isFromASTFile())
1951  return false;
1952  // Anonymous entities cannot be addressed. Treat them as not from module.
1953  if (!RD->isExternallyVisible() && RD->getName().empty())
1954  return false;
1955  if (auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD)) {
1956  if (!CXXDecl->isCompleteDefinition())
1957  return false;
1958  auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
1959  if (TemplateKind != TSK_Undeclared) {
1960  // This is a template, check the origin of the first member.
1961  if (CXXDecl->field_begin() == CXXDecl->field_end())
1962  return TemplateKind == TSK_ExplicitInstantiationDeclaration;
1963  if (!CXXDecl->field_begin()->isFromASTFile())
1964  return false;
1965  }
1966  }
1967  return true;
1968 }
1969 
1971  if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1972  if (CXXRD->isDynamicClass() &&
1973  CGM.getVTableLinkage(CXXRD) ==
1974  llvm::GlobalValue::AvailableExternallyLinkage &&
1975  !isClassOrMethodDLLImport(CXXRD))
1976  return;
1977 
1978  if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
1979  return;
1980 
1981  completeClass(RD);
1982 }
1983 
1985  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
1986  return;
1987  QualType Ty = CGM.getContext().getRecordType(RD);
1988  void *TyPtr = Ty.getAsOpaquePtr();
1989  auto I = TypeCache.find(TyPtr);
1990  if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
1991  return;
1992  llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
1993  assert(!Res->isForwardDecl());
1994  TypeCache[TyPtr].reset(Res);
1995 }
1996 
1999  for (CXXMethodDecl *MD : llvm::make_range(I, End))
2001  if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
2002  !MD->getMemberSpecializationInfo()->isExplicitSpecialization())
2003  return true;
2004  return false;
2005 }
2006 
2008  bool DebugTypeExtRefs, const RecordDecl *RD,
2009  const LangOptions &LangOpts) {
2010  if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
2011  return true;
2012 
2013  if (auto *ES = RD->getASTContext().getExternalSource())
2014  if (ES->hasExternalDefinitions(RD) == ExternalASTSource::EK_Always)
2015  return true;
2016 
2017  if (DebugKind > codegenoptions::LimitedDebugInfo)
2018  return false;
2019 
2020  if (!LangOpts.CPlusPlus)
2021  return false;
2022 
2023  if (!RD->isCompleteDefinitionRequired())
2024  return true;
2025 
2026  const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2027 
2028  if (!CXXDecl)
2029  return false;
2030 
2031  // Only emit complete debug info for a dynamic class when its vtable is
2032  // emitted. However, Microsoft debuggers don't resolve type information
2033  // across DLL boundaries, so skip this optimization if the class or any of its
2034  // methods are marked dllimport. This isn't a complete solution, since objects
2035  // without any dllimport methods can be used in one DLL and constructed in
2036  // another, but it is the current behavior of LimitedDebugInfo.
2037  if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
2038  !isClassOrMethodDLLImport(CXXDecl))
2039  return true;
2040 
2042  if (const auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD))
2043  Spec = SD->getSpecializationKind();
2044 
2047  CXXDecl->method_end()))
2048  return true;
2049 
2050  return false;
2051 }
2052 
2054  if (shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD, CGM.getLangOpts()))
2055  return;
2056 
2057  QualType Ty = CGM.getContext().getRecordType(RD);
2058  llvm::DIType *T = getTypeOrNull(Ty);
2059  if (T && T->isForwardDecl())
2060  completeClassData(RD);
2061 }
2062 
2063 llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
2064  RecordDecl *RD = Ty->getDecl();
2065  llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
2066  if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
2067  CGM.getLangOpts())) {
2068  if (!T)
2069  T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
2070  return T;
2071  }
2072 
2073  return CreateTypeDefinition(Ty);
2074 }
2075 
2076 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
2077  RecordDecl *RD = Ty->getDecl();
2078 
2079  // Get overall information about the record type for the debug info.
2080  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2081 
2082  // Records and classes and unions can all be recursive. To handle them, we
2083  // first generate a debug descriptor for the struct as a forward declaration.
2084  // Then (if it is a definition) we go through and get debug info for all of
2085  // its members. Finally, we create a descriptor for the complete type (which
2086  // may refer to the forward decl if the struct is recursive) and replace all
2087  // uses of the forward declaration with the final definition.
2088  llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty, DefUnit);
2089 
2090  const RecordDecl *D = RD->getDefinition();
2091  if (!D || !D->isCompleteDefinition())
2092  return FwdDecl;
2093 
2094  if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
2095  CollectContainingType(CXXDecl, FwdDecl);
2096 
2097  // Push the struct on region stack.
2098  LexicalBlockStack.emplace_back(&*FwdDecl);
2099  RegionMap[Ty->getDecl()].reset(FwdDecl);
2100 
2101  // Convert all the elements.
2103  // what about nested types?
2104 
2105  // Note: The split of CXXDecl information here is intentional, the
2106  // gdb tests will depend on a certain ordering at printout. The debug
2107  // information offsets are still correct if we merge them all together
2108  // though.
2109  const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2110  if (CXXDecl) {
2111  CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
2112  CollectVTableInfo(CXXDecl, DefUnit, EltTys, FwdDecl);
2113  }
2114 
2115  // Collect data fields (including static variables and any initializers).
2116  CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
2117  if (CXXDecl)
2118  CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
2119 
2120  LexicalBlockStack.pop_back();
2121  RegionMap.erase(Ty->getDecl());
2122 
2123  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2124  DBuilder.replaceArrays(FwdDecl, Elements);
2125 
2126  if (FwdDecl->isTemporary())
2127  FwdDecl =
2128  llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
2129 
2130  RegionMap[Ty->getDecl()].reset(FwdDecl);
2131  return FwdDecl;
2132 }
2133 
2134 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
2135  llvm::DIFile *Unit) {
2136  // Ignore protocols.
2137  return getOrCreateType(Ty->getBaseType(), Unit);
2138 }
2139 
2140 llvm::DIType *CGDebugInfo::CreateType(const ObjCTypeParamType *Ty,
2141  llvm::DIFile *Unit) {
2142  // Ignore protocols.
2143  SourceLocation Loc = Ty->getDecl()->getLocation();
2144 
2145  // Use Typedefs to represent ObjCTypeParamType.
2146  return DBuilder.createTypedef(
2147  getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
2148  Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
2149  getDeclContextDescriptor(Ty->getDecl()));
2150 }
2151 
2152 /// \return true if Getter has the default name for the property PD.
2154  const ObjCMethodDecl *Getter) {
2155  assert(PD);
2156  if (!Getter)
2157  return true;
2158 
2159  assert(Getter->getDeclName().isObjCZeroArgSelector());
2160  return PD->getName() ==
2162 }
2163 
2164 /// \return true if Setter has the default name for the property PD.
2166  const ObjCMethodDecl *Setter) {
2167  assert(PD);
2168  if (!Setter)
2169  return true;
2170 
2171  assert(Setter->getDeclName().isObjCOneArgSelector());
2174 }
2175 
2176 llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
2177  llvm::DIFile *Unit) {
2178  ObjCInterfaceDecl *ID = Ty->getDecl();
2179  if (!ID)
2180  return nullptr;
2181 
2182  // Return a forward declaration if this type was imported from a clang module,
2183  // and this is not the compile unit with the implementation of the type (which
2184  // may contain hidden ivars).
2185  if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition() &&
2186  !ID->getImplementation())
2187  return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
2188  ID->getName(),
2189  getDeclContextDescriptor(ID), Unit, 0);
2190 
2191  // Get overall information about the record type for the debug info.
2192  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2193  unsigned Line = getLineNumber(ID->getLocation());
2194  auto RuntimeLang =
2195  static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
2196 
2197  // If this is just a forward declaration return a special forward-declaration
2198  // debug type since we won't be able to lay out the entire type.
2199  ObjCInterfaceDecl *Def = ID->getDefinition();
2200  if (!Def || !Def->getImplementation()) {
2201  llvm::DIScope *Mod = getParentModuleOrNull(ID);
2202  llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
2203  llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
2204  DefUnit, Line, RuntimeLang);
2205  ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
2206  return FwdDecl;
2207  }
2208 
2209  return CreateTypeDefinition(Ty, Unit);
2210 }
2211 
2212 llvm::DIModule *
2213 CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
2214  bool CreateSkeletonCU) {
2215  // Use the Module pointer as the key into the cache. This is a
2216  // nullptr if the "Module" is a PCH, which is safe because we don't
2217  // support chained PCH debug info, so there can only be a single PCH.
2218  const Module *M = Mod.getModuleOrNull();
2219  auto ModRef = ModuleCache.find(M);
2220  if (ModRef != ModuleCache.end())
2221  return cast<llvm::DIModule>(ModRef->second);
2222 
2223  // Macro definitions that were defined with "-D" on the command line.
2224  SmallString<128> ConfigMacros;
2225  {
2226  llvm::raw_svector_ostream OS(ConfigMacros);
2227  const auto &PPOpts = CGM.getPreprocessorOpts();
2228  unsigned I = 0;
2229  // Translate the macro definitions back into a command line.
2230  for (auto &M : PPOpts.Macros) {
2231  if (++I > 1)
2232  OS << " ";
2233  const std::string &Macro = M.first;
2234  bool Undef = M.second;
2235  OS << "\"-" << (Undef ? 'U' : 'D');
2236  for (char c : Macro)
2237  switch (c) {
2238  case '\\':
2239  OS << "\\\\";
2240  break;
2241  case '"':
2242  OS << "\\\"";
2243  break;
2244  default:
2245  OS << c;
2246  }
2247  OS << '\"';
2248  }
2249  }
2250 
2251  bool IsRootModule = M ? !M->Parent : true;
2252  if (CreateSkeletonCU && IsRootModule) {
2253  // PCH files don't have a signature field in the control block,
2254  // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
2255  // We use the lower 64 bits for debug info.
2256  uint64_t Signature =
2257  Mod.getSignature()
2258  ? (uint64_t)Mod.getSignature()[1] << 32 | Mod.getSignature()[0]
2259  : ~1ULL;
2260  llvm::DIBuilder DIB(CGM.getModule());
2261  DIB.createCompileUnit(TheCU->getSourceLanguage(),
2262  // TODO: Support "Source" from external AST providers?
2263  DIB.createFile(Mod.getModuleName(), Mod.getPath()),
2264  TheCU->getProducer(), true, StringRef(), 0,
2265  Mod.getASTFile(), llvm::DICompileUnit::FullDebug,
2266  Signature);
2267  DIB.finalize();
2268  }
2269  llvm::DIModule *Parent =
2270  IsRootModule ? nullptr
2271  : getOrCreateModuleRef(
2273  CreateSkeletonCU);
2274  llvm::DIModule *DIMod =
2275  DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
2276  Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
2277  ModuleCache[M].reset(DIMod);
2278  return DIMod;
2279 }
2280 
2281 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
2282  llvm::DIFile *Unit) {
2283  ObjCInterfaceDecl *ID = Ty->getDecl();
2284  llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2285  unsigned Line = getLineNumber(ID->getLocation());
2286  unsigned RuntimeLang = TheCU->getSourceLanguage();
2287 
2288  // Bit size, align and offset of the type.
2289  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2290  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2291 
2292  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2293  if (ID->getImplementation())
2294  Flags |= llvm::DINode::FlagObjcClassComplete;
2295 
2296  llvm::DIScope *Mod = getParentModuleOrNull(ID);
2297  llvm::DICompositeType *RealDecl = DBuilder.createStructType(
2298  Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
2299  nullptr, llvm::DINodeArray(), RuntimeLang);
2300 
2301  QualType QTy(Ty, 0);
2302  TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
2303 
2304  // Push the struct on region stack.
2305  LexicalBlockStack.emplace_back(RealDecl);
2306  RegionMap[Ty->getDecl()].reset(RealDecl);
2307 
2308  // Convert all the elements.
2310 
2311  ObjCInterfaceDecl *SClass = ID->getSuperClass();
2312  if (SClass) {
2313  llvm::DIType *SClassTy =
2314  getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
2315  if (!SClassTy)
2316  return nullptr;
2317 
2318  llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0,
2319  llvm::DINode::FlagZero);
2320  EltTys.push_back(InhTag);
2321  }
2322 
2323  // Create entries for all of the properties.
2324  auto AddProperty = [&](const ObjCPropertyDecl *PD) {
2325  SourceLocation Loc = PD->getLocation();
2326  llvm::DIFile *PUnit = getOrCreateFile(Loc);
2327  unsigned PLine = getLineNumber(Loc);
2328  ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2329  ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2330  llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
2331  PD->getName(), PUnit, PLine,
2332  hasDefaultGetterName(PD, Getter) ? ""
2333  : getSelectorName(PD->getGetterName()),
2334  hasDefaultSetterName(PD, Setter) ? ""
2335  : getSelectorName(PD->getSetterName()),
2336  PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
2337  EltTys.push_back(PropertyNode);
2338  };
2339  {
2340  llvm::SmallPtrSet<const IdentifierInfo *, 16> PropertySet;
2341  for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
2342  for (auto *PD : ClassExt->properties()) {
2343  PropertySet.insert(PD->getIdentifier());
2344  AddProperty(PD);
2345  }
2346  for (const auto *PD : ID->properties()) {
2347  // Don't emit duplicate metadata for properties that were already in a
2348  // class extension.
2349  if (!PropertySet.insert(PD->getIdentifier()).second)
2350  continue;
2351  AddProperty(PD);
2352  }
2353  }
2354 
2355  const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
2356  unsigned FieldNo = 0;
2357  for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
2358  Field = Field->getNextIvar(), ++FieldNo) {
2359  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
2360  if (!FieldTy)
2361  return nullptr;
2362 
2363  StringRef FieldName = Field->getName();
2364 
2365  // Ignore unnamed fields.
2366  if (FieldName.empty())
2367  continue;
2368 
2369  // Get the location for the field.
2370  llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
2371  unsigned FieldLine = getLineNumber(Field->getLocation());
2372  QualType FType = Field->getType();
2373  uint64_t FieldSize = 0;
2374  uint32_t FieldAlign = 0;
2375 
2376  if (!FType->isIncompleteArrayType()) {
2377 
2378  // Bit size, align and offset of the type.
2379  FieldSize = Field->isBitField()
2380  ? Field->getBitWidthValue(CGM.getContext())
2381  : CGM.getContext().getTypeSize(FType);
2382  FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
2383  }
2384 
2385  uint64_t FieldOffset;
2386  if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2387  // We don't know the runtime offset of an ivar if we're using the
2388  // non-fragile ABI. For bitfields, use the bit offset into the first
2389  // byte of storage of the bitfield. For other fields, use zero.
2390  if (Field->isBitField()) {
2391  FieldOffset =
2392  CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
2393  FieldOffset %= CGM.getContext().getCharWidth();
2394  } else {
2395  FieldOffset = 0;
2396  }
2397  } else {
2398  FieldOffset = RL.getFieldOffset(FieldNo);
2399  }
2400 
2401  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2402  if (Field->getAccessControl() == ObjCIvarDecl::Protected)
2403  Flags = llvm::DINode::FlagProtected;
2404  else if (Field->getAccessControl() == ObjCIvarDecl::Private)
2405  Flags = llvm::DINode::FlagPrivate;
2406  else if (Field->getAccessControl() == ObjCIvarDecl::Public)
2407  Flags = llvm::DINode::FlagPublic;
2408 
2409  llvm::MDNode *PropertyNode = nullptr;
2410  if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
2411  if (ObjCPropertyImplDecl *PImpD =
2412  ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
2413  if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
2414  SourceLocation Loc = PD->getLocation();
2415  llvm::DIFile *PUnit = getOrCreateFile(Loc);
2416  unsigned PLine = getLineNumber(Loc);
2417  ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2418  ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2419  PropertyNode = DBuilder.createObjCProperty(
2420  PD->getName(), PUnit, PLine,
2421  hasDefaultGetterName(PD, Getter)
2422  ? ""
2423  : getSelectorName(PD->getGetterName()),
2424  hasDefaultSetterName(PD, Setter)
2425  ? ""
2426  : getSelectorName(PD->getSetterName()),
2427  PD->getPropertyAttributes(),
2428  getOrCreateType(PD->getType(), PUnit));
2429  }
2430  }
2431  }
2432  FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
2433  FieldSize, FieldAlign, FieldOffset, Flags,
2434  FieldTy, PropertyNode);
2435  EltTys.push_back(FieldTy);
2436  }
2437 
2438  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2439  DBuilder.replaceArrays(RealDecl, Elements);
2440 
2441  LexicalBlockStack.pop_back();
2442  return RealDecl;
2443 }
2444 
2445 llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
2446  llvm::DIFile *Unit) {
2447  llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
2448  int64_t Count = Ty->getNumElements();
2449 
2450  llvm::Metadata *Subscript;
2451  QualType QTy(Ty, 0);
2452  auto SizeExpr = SizeExprCache.find(QTy);
2453  if (SizeExpr != SizeExprCache.end())
2454  Subscript = DBuilder.getOrCreateSubrange(0, SizeExpr->getSecond());
2455  else
2456  Subscript = DBuilder.getOrCreateSubrange(0, Count ? Count : -1);
2457  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
2458 
2459  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2460  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2461 
2462  return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
2463 }
2464 
2465 llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
2466  uint64_t Size;
2467  uint32_t Align;
2468 
2469  // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
2470  if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2471  Size = 0;
2472  Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
2473  CGM.getContext());
2474  } else if (Ty->isIncompleteArrayType()) {
2475  Size = 0;
2476  if (Ty->getElementType()->isIncompleteType())
2477  Align = 0;
2478  else
2479  Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
2480  } else if (Ty->isIncompleteType()) {
2481  Size = 0;
2482  Align = 0;
2483  } else {
2484  // Size and align of the whole array, not the element type.
2485  Size = CGM.getContext().getTypeSize(Ty);
2486  Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2487  }
2488 
2489  // Add the dimensions of the array. FIXME: This loses CV qualifiers from
2490  // interior arrays, do we care? Why aren't nested arrays represented the
2491  // obvious/recursive way?
2493  QualType EltTy(Ty, 0);
2494  while ((Ty = dyn_cast<ArrayType>(EltTy))) {
2495  // If the number of elements is known, then count is that number. Otherwise,
2496  // it's -1. This allows us to represent a subrange with an array of 0
2497  // elements, like this:
2498  //
2499  // struct foo {
2500  // int x[0];
2501  // };
2502  int64_t Count = -1; // Count == -1 is an unbounded array.
2503  if (const auto *CAT = dyn_cast<ConstantArrayType>(Ty))
2504  Count = CAT->getSize().getZExtValue();
2505  else if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2506  if (Expr *Size = VAT->getSizeExpr()) {
2507  llvm::APSInt V;
2508  if (Size->EvaluateAsInt(V, CGM.getContext()))
2509  Count = V.getExtValue();
2510  }
2511  }
2512 
2513  auto SizeNode = SizeExprCache.find(EltTy);
2514  if (SizeNode != SizeExprCache.end())
2515  Subscripts.push_back(
2516  DBuilder.getOrCreateSubrange(0, SizeNode->getSecond()));
2517  else
2518  Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
2519  EltTy = Ty->getElementType();
2520  }
2521 
2522  llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
2523 
2524  return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
2525  SubscriptArray);
2526 }
2527 
2528 llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
2529  llvm::DIFile *Unit) {
2530  return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
2531  Ty->getPointeeType(), Unit);
2532 }
2533 
2534 llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
2535  llvm::DIFile *Unit) {
2536  return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
2537  Ty->getPointeeType(), Unit);
2538 }
2539 
2540 llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
2541  llvm::DIFile *U) {
2542  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2543  uint64_t Size = 0;
2544 
2545  if (!Ty->isIncompleteType()) {
2546  Size = CGM.getContext().getTypeSize(Ty);
2547 
2548  // Set the MS inheritance model. There is no flag for the unspecified model.
2549  if (CGM.getTarget().getCXXABI().isMicrosoft()) {
2551  case MSInheritanceAttr::Keyword_single_inheritance:
2552  Flags |= llvm::DINode::FlagSingleInheritance;
2553  break;
2554  case MSInheritanceAttr::Keyword_multiple_inheritance:
2555  Flags |= llvm::DINode::FlagMultipleInheritance;
2556  break;
2557  case MSInheritanceAttr::Keyword_virtual_inheritance:
2558  Flags |= llvm::DINode::FlagVirtualInheritance;
2559  break;
2560  case MSInheritanceAttr::Keyword_unspecified_inheritance:
2561  break;
2562  }
2563  }
2564  }
2565 
2566  llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
2567  if (Ty->isMemberDataPointerType())
2568  return DBuilder.createMemberPointerType(
2569  getOrCreateType(Ty->getPointeeType(), U), ClassType, Size, /*Align=*/0,
2570  Flags);
2571 
2572  const FunctionProtoType *FPT =
2574  return DBuilder.createMemberPointerType(
2575  getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
2576  Ty->getClass(), FPT->getTypeQuals())),
2577  FPT, U),
2578  ClassType, Size, /*Align=*/0, Flags);
2579 }
2580 
2581 llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
2582  auto *FromTy = getOrCreateType(Ty->getValueType(), U);
2583  return DBuilder.createQualifiedType(llvm::dwarf::DW_TAG_atomic_type, FromTy);
2584 }
2585 
2586 llvm::DIType *CGDebugInfo::CreateType(const PipeType *Ty, llvm::DIFile *U) {
2587  return getOrCreateType(Ty->getElementType(), U);
2588 }
2589 
2590 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
2591  const EnumDecl *ED = Ty->getDecl();
2592 
2593  uint64_t Size = 0;
2594  uint32_t Align = 0;
2595  if (!ED->getTypeForDecl()->isIncompleteType()) {
2596  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2597  Align = getDeclAlignIfRequired(ED, CGM.getContext());
2598  }
2599 
2600  SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2601 
2602  bool isImportedFromModule =
2603  DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
2604 
2605  // If this is just a forward declaration, construct an appropriately
2606  // marked node and just return it.
2607  if (isImportedFromModule || !ED->getDefinition()) {
2608  // Note that it is possible for enums to be created as part of
2609  // their own declcontext. In this case a FwdDecl will be created
2610  // twice. This doesn't cause a problem because both FwdDecls are
2611  // entered into the ReplaceMap: finalize() will replace the first
2612  // FwdDecl with the second and then replace the second with
2613  // complete type.
2614  llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
2615  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2616  llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
2617  llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));
2618 
2619  unsigned Line = getLineNumber(ED->getLocation());
2620  StringRef EDName = ED->getName();
2621  llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
2622  llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
2623  0, Size, Align, llvm::DINode::FlagFwdDecl, Identifier);
2624 
2625  ReplaceMap.emplace_back(
2626  std::piecewise_construct, std::make_tuple(Ty),
2627  std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
2628  return RetTy;
2629  }
2630 
2631  return CreateTypeDefinition(Ty);
2632 }
2633 
2634 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
2635  const EnumDecl *ED = Ty->getDecl();
2636  uint64_t Size = 0;
2637  uint32_t Align = 0;
2638  if (!ED->getTypeForDecl()->isIncompleteType()) {
2639  Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2640  Align = getDeclAlignIfRequired(ED, CGM.getContext());
2641  }
2642 
2643  SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2644 
2645  // Create elements for each enumerator.
2647  ED = ED->getDefinition();
2648  bool IsSigned = ED->getIntegerType()->isSignedIntegerType();
2649  for (const auto *Enum : ED->enumerators()) {
2650  const auto &InitVal = Enum->getInitVal();
2651  auto Value = IsSigned ? InitVal.getSExtValue() : InitVal.getZExtValue();
2652  Enumerators.push_back(
2653  DBuilder.createEnumerator(Enum->getName(), Value, !IsSigned));
2654  }
2655 
2656  // Return a CompositeType for the enum itself.
2657  llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
2658 
2659  llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2660  unsigned Line = getLineNumber(ED->getLocation());
2661  llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
2662  llvm::DIType *ClassTy = getOrCreateType(ED->getIntegerType(), DefUnit);
2663  return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
2664  Line, Size, Align, EltArray, ClassTy,
2665  Identifier, ED->isFixed());
2666 }
2667 
2668 llvm::DIMacro *CGDebugInfo::CreateMacro(llvm::DIMacroFile *Parent,
2669  unsigned MType, SourceLocation LineLoc,
2670  StringRef Name, StringRef Value) {
2671  unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2672  return DBuilder.createMacro(Parent, Line, MType, Name, Value);
2673 }
2674 
2675 llvm::DIMacroFile *CGDebugInfo::CreateTempMacroFile(llvm::DIMacroFile *Parent,
2676  SourceLocation LineLoc,
2677  SourceLocation FileLoc) {
2678  llvm::DIFile *FName = getOrCreateFile(FileLoc);
2679  unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2680  return DBuilder.createTempMacroFile(Parent, Line, FName);
2681 }
2682 
2684  Qualifiers Quals;
2685  do {
2686  Qualifiers InnerQuals = T.getLocalQualifiers();
2687  // Qualifiers::operator+() doesn't like it if you add a Qualifier
2688  // that is already there.
2689  Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
2690  Quals += InnerQuals;
2691  QualType LastT = T;
2692  switch (T->getTypeClass()) {
2693  default:
2694  return C.getQualifiedType(T.getTypePtr(), Quals);
2695  case Type::TemplateSpecialization: {
2696  const auto *Spec = cast<TemplateSpecializationType>(T);
2697  if (Spec->isTypeAlias())
2698  return C.getQualifiedType(T.getTypePtr(), Quals);
2699  T = Spec->desugar();
2700  break;
2701  }
2702  case Type::TypeOfExpr:
2703  T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
2704  break;
2705  case Type::TypeOf:
2706  T = cast<TypeOfType>(T)->getUnderlyingType();
2707  break;
2708  case Type::Decltype:
2709  T = cast<DecltypeType>(T)->getUnderlyingType();
2710  break;
2711  case Type::UnaryTransform:
2712  T = cast<UnaryTransformType>(T)->getUnderlyingType();
2713  break;
2714  case Type::Attributed:
2715  T = cast<AttributedType>(T)->getEquivalentType();
2716  break;
2717  case Type::Elaborated:
2718  T = cast<ElaboratedType>(T)->getNamedType();
2719  break;
2720  case Type::Paren:
2721  T = cast<ParenType>(T)->getInnerType();
2722  break;
2723  case Type::SubstTemplateTypeParm:
2724  T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
2725  break;
2726  case Type::Auto:
2727  case Type::DeducedTemplateSpecialization: {
2728  QualType DT = cast<DeducedType>(T)->getDeducedType();
2729  assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
2730  T = DT;
2731  break;
2732  }
2733  case Type::Adjusted:
2734  case Type::Decayed:
2735  // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
2736  T = cast<AdjustedType>(T)->getAdjustedType();
2737  break;
2738  }
2739 
2740  assert(T != LastT && "Type unwrapping failed to unwrap!");
2741  (void)LastT;
2742  } while (true);
2743 }
2744 
2745 llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
2746 
2747  // Unwrap the type as needed for debug information.
2748  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2749 
2750  auto It = TypeCache.find(Ty.getAsOpaquePtr());
2751  if (It != TypeCache.end()) {
2752  // Verify that the debug info still exists.
2753  if (llvm::Metadata *V = It->second)
2754  return cast<llvm::DIType>(V);
2755  }
2756 
2757  return nullptr;
2758 }
2759 
2761  const ClassTemplateSpecializationDecl &SD) {
2762  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2763  return;
2764  completeUnusedClass(SD);
2765 }
2766 
2768  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2769  return;
2770 
2771  completeClassData(&D);
2772  // In case this type has no member function definitions being emitted, ensure
2773  // it is retained
2774  RetainedTypes.push_back(CGM.getContext().getRecordType(&D).getAsOpaquePtr());
2775 }
2776 
2777 llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
2778  if (Ty.isNull())
2779  return nullptr;
2780 
2781  // Unwrap the type as needed for debug information.
2782  Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2783 
2784  if (auto *T = getTypeOrNull(Ty))
2785  return T;
2786 
2787  llvm::DIType *Res = CreateTypeNode(Ty, Unit);
2788  void *TyPtr = Ty.getAsOpaquePtr();
2789 
2790  // And update the type cache.
2791  TypeCache[TyPtr].reset(Res);
2792 
2793  return Res;
2794 }
2795 
2796 llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
2797  // A forward declaration inside a module header does not belong to the module.
2798  if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
2799  return nullptr;
2800  if (DebugTypeExtRefs && D->isFromASTFile()) {
2801  // Record a reference to an imported clang module or precompiled header.
2802  auto *Reader = CGM.getContext().getExternalSource();
2803  auto Idx = D->getOwningModuleID();
2804  auto Info = Reader->getSourceDescriptor(Idx);
2805  if (Info)
2806  return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
2807  } else if (ClangModuleMap) {
2808  // We are building a clang module or a precompiled header.
2809  //
2810  // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
2811  // and it wouldn't be necessary to specify the parent scope
2812  // because the type is already unique by definition (it would look
2813  // like the output of -fno-standalone-debug). On the other hand,
2814  // the parent scope helps a consumer to quickly locate the object
2815  // file where the type's definition is located, so it might be
2816  // best to make this behavior a command line or debugger tuning
2817  // option.
2818  if (Module *M = D->getOwningModule()) {
2819  // This is a (sub-)module.
2821  return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
2822  } else {
2823  // This the precompiled header being built.
2824  return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
2825  }
2826  }
2827 
2828  return nullptr;
2829 }
2830 
2831 llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
2832  // Handle qualifiers, which recursively handles what they refer to.
2833  if (Ty.hasLocalQualifiers())
2834  return CreateQualifiedType(Ty, Unit);
2835 
2836  // Work out details of type.
2837  switch (Ty->getTypeClass()) {
2838 #define TYPE(Class, Base)
2839 #define ABSTRACT_TYPE(Class, Base)
2840 #define NON_CANONICAL_TYPE(Class, Base)
2841 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
2842 #include "clang/AST/TypeNodes.def"
2843  llvm_unreachable("Dependent types cannot show up in debug information");
2844 
2845  case Type::ExtVector:
2846  case Type::Vector:
2847  return CreateType(cast<VectorType>(Ty), Unit);
2848  case Type::ObjCObjectPointer:
2849  return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
2850  case Type::ObjCObject:
2851  return CreateType(cast<ObjCObjectType>(Ty), Unit);
2852  case Type::ObjCTypeParam:
2853  return CreateType(cast<ObjCTypeParamType>(Ty), Unit);
2854  case Type::ObjCInterface:
2855  return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
2856  case Type::Builtin:
2857  return CreateType(cast<BuiltinType>(Ty));
2858  case Type::Complex:
2859  return CreateType(cast<ComplexType>(Ty));
2860  case Type::Pointer:
2861  return CreateType(cast<PointerType>(Ty), Unit);
2862  case Type::BlockPointer:
2863  return CreateType(cast<BlockPointerType>(Ty), Unit);
2864  case Type::Typedef:
2865  return CreateType(cast<TypedefType>(Ty), Unit);
2866  case Type::Record:
2867  return CreateType(cast<RecordType>(Ty));
2868  case Type::Enum:
2869  return CreateEnumType(cast<EnumType>(Ty));
2870  case Type::FunctionProto:
2871  case Type::FunctionNoProto:
2872  return CreateType(cast<FunctionType>(Ty), Unit);
2873  case Type::ConstantArray:
2874  case Type::VariableArray:
2875  case Type::IncompleteArray:
2876  return CreateType(cast<ArrayType>(Ty), Unit);
2877 
2878  case Type::LValueReference:
2879  return CreateType(cast<LValueReferenceType>(Ty), Unit);
2880  case Type::RValueReference:
2881  return CreateType(cast<RValueReferenceType>(Ty), Unit);
2882 
2883  case Type::MemberPointer:
2884  return CreateType(cast<MemberPointerType>(Ty), Unit);
2885 
2886  case Type::Atomic:
2887  return CreateType(cast<AtomicType>(Ty), Unit);
2888 
2889  case Type::Pipe:
2890  return CreateType(cast<PipeType>(Ty), Unit);
2891 
2892  case Type::TemplateSpecialization:
2893  return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
2894 
2895  case Type::Auto:
2896  case Type::Attributed:
2897  case Type::Adjusted:
2898  case Type::Decayed:
2899  case Type::DeducedTemplateSpecialization:
2900  case Type::Elaborated:
2901  case Type::Paren:
2902  case Type::SubstTemplateTypeParm:
2903  case Type::TypeOfExpr:
2904  case Type::TypeOf:
2905  case Type::Decltype:
2906  case Type::UnaryTransform:
2907  case Type::PackExpansion:
2908  break;
2909  }
2910 
2911  llvm_unreachable("type should have been unwrapped!");
2912 }
2913 
2914 llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
2915  llvm::DIFile *Unit) {
2916  QualType QTy(Ty, 0);
2917 
2918  auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
2919 
2920  // We may have cached a forward decl when we could have created
2921  // a non-forward decl. Go ahead and create a non-forward decl
2922  // now.
2923  if (T && !T->isForwardDecl())
2924  return T;
2925 
2926  // Otherwise create the type.
2927  llvm::DICompositeType *Res = CreateLimitedType(Ty);
2928 
2929  // Propagate members from the declaration to the definition
2930  // CreateType(const RecordType*) will overwrite this with the members in the
2931  // correct order if the full type is needed.
2932  DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
2933 
2934  // And update the type cache.
2935  TypeCache[QTy.getAsOpaquePtr()].reset(Res);
2936  return Res;
2937 }
2938 
2939 // TODO: Currently used for context chains when limiting debug info.
2940 llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
2941  RecordDecl *RD = Ty->getDecl();
2942 
2943  // Get overall information about the record type for the debug info.
2944  llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2945  unsigned Line = getLineNumber(RD->getLocation());
2946  StringRef RDName = getClassName(RD);
2947 
2948  llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
2949 
2950  // If we ended up creating the type during the context chain construction,
2951  // just return that.
2952  auto *T = cast_or_null<llvm::DICompositeType>(
2953  getTypeOrNull(CGM.getContext().getRecordType(RD)));
2954  if (T && (!T->isForwardDecl() || !RD->getDefinition()))
2955  return T;
2956 
2957  // If this is just a forward or incomplete declaration, construct an
2958  // appropriately marked node and just return it.
2959  const RecordDecl *D = RD->getDefinition();
2960  if (!D || !D->isCompleteDefinition())
2961  return getOrCreateRecordFwdDecl(Ty, RDContext);
2962 
2963  uint64_t Size = CGM.getContext().getTypeSize(Ty);
2964  auto Align = getDeclAlignIfRequired(D, CGM.getContext());
2965 
2966  SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2967 
2968  // Explicitly record the calling convention for C++ records.
2969  auto Flags = llvm::DINode::FlagZero;
2970  if (auto CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
2971  if (CGM.getCXXABI().getRecordArgABI(CXXRD) == CGCXXABI::RAA_Indirect)
2972  Flags |= llvm::DINode::FlagTypePassByReference;
2973  else
2974  Flags |= llvm::DINode::FlagTypePassByValue;
2975 
2976  // Record if a C++ record is trivial type.
2977  if (CXXRD->isTrivial())
2978  Flags |= llvm::DINode::FlagTrivial;
2979  }
2980 
2981  llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
2982  getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
2983  Flags, Identifier);
2984 
2985  // Elements of composite types usually have back to the type, creating
2986  // uniquing cycles. Distinct nodes are more efficient.
2987  switch (RealDecl->getTag()) {
2988  default:
2989  llvm_unreachable("invalid composite type tag");
2990 
2991  case llvm::dwarf::DW_TAG_array_type:
2992  case llvm::dwarf::DW_TAG_enumeration_type:
2993  // Array elements and most enumeration elements don't have back references,
2994  // so they don't tend to be involved in uniquing cycles and there is some
2995  // chance of merging them when linking together two modules. Only make
2996  // them distinct if they are ODR-uniqued.
2997  if (Identifier.empty())
2998  break;
2999  LLVM_FALLTHROUGH;
3000 
3001  case llvm::dwarf::DW_TAG_structure_type:
3002  case llvm::dwarf::DW_TAG_union_type:
3003  case llvm::dwarf::DW_TAG_class_type:
3004  // Immediately resolve to a distinct node.
3005  RealDecl =
3006  llvm::MDNode::replaceWithDistinct(llvm::TempDICompositeType(RealDecl));
3007  break;
3008  }
3009 
3010  RegionMap[Ty->getDecl()].reset(RealDecl);
3011  TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
3012 
3013  if (const auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
3014  DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
3015  CollectCXXTemplateParams(TSpecial, DefUnit));
3016  return RealDecl;
3017 }
3018 
3019 void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
3020  llvm::DICompositeType *RealDecl) {
3021  // A class's primary base or the class itself contains the vtable.
3022  llvm::DICompositeType *ContainingType = nullptr;
3023  const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
3024  if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
3025  // Seek non-virtual primary base root.
3026  while (1) {
3027  const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
3028  const CXXRecordDecl *PBT = BRL.getPrimaryBase();
3029  if (PBT && !BRL.isPrimaryBaseVirtual())
3030  PBase = PBT;
3031  else
3032  break;
3033  }
3034  ContainingType = cast<llvm::DICompositeType>(
3035  getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
3036  getOrCreateFile(RD->getLocation())));
3037  } else if (RD->isDynamicClass())
3038  ContainingType = RealDecl;
3039 
3040  DBuilder.replaceVTableHolder(RealDecl, ContainingType);
3041 }
3042 
3043 llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
3044  StringRef Name, uint64_t *Offset) {
3045  llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
3046  uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
3047  auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
3048  llvm::DIType *Ty =
3049  DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
3050  *Offset, llvm::DINode::FlagZero, FieldTy);
3051  *Offset += FieldSize;
3052  return Ty;
3053 }
3054 
3055 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
3056  StringRef &Name,
3057  StringRef &LinkageName,
3058  llvm::DIScope *&FDContext,
3059  llvm::DINodeArray &TParamsArray,
3060  llvm::DINode::DIFlags &Flags) {
3061  const auto *FD = cast<FunctionDecl>(GD.getDecl());
3062  Name = getFunctionName(FD);
3063  // Use mangled name as linkage name for C/C++ functions.
3064  if (FD->hasPrototype()) {
3065  LinkageName = CGM.getMangledName(GD);
3066  Flags |= llvm::DINode::FlagPrototyped;
3067  }
3068  // No need to replicate the linkage name if it isn't different from the
3069  // subprogram name, no need to have it at all unless coverage is enabled or
3070  // debug is set to more than just line tables or extra debug info is needed.
3071  if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
3072  !CGM.getCodeGenOpts().EmitGcovNotes &&
3073  !CGM.getCodeGenOpts().DebugInfoForProfiling &&
3075  LinkageName = StringRef();
3076 
3077  if (DebugKind >= codegenoptions::LimitedDebugInfo) {
3078  if (const NamespaceDecl *NSDecl =
3079  dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
3080  FDContext = getOrCreateNamespace(NSDecl);
3081  else if (const RecordDecl *RDecl =
3082  dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
3083  llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
3084  FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
3085  }
3086  // Check if it is a noreturn-marked function
3087  if (FD->isNoReturn())
3088  Flags |= llvm::DINode::FlagNoReturn;
3089  // Collect template parameters.
3090  TParamsArray = CollectFunctionTemplateParams(FD, Unit);
3091  }
3092 }
3093 
3094 void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
3095  unsigned &LineNo, QualType &T,
3096  StringRef &Name, StringRef &LinkageName,
3097  llvm::MDTuple *&TemplateParameters,
3098  llvm::DIScope *&VDContext) {
3099  Unit = getOrCreateFile(VD->getLocation());
3100  LineNo = getLineNumber(VD->getLocation());
3101 
3102  setLocation(VD->getLocation());
3103 
3104  T = VD->getType();
3105  if (T->isIncompleteArrayType()) {
3106  // CodeGen turns int[] into int[1] so we'll do the same here.
3107  llvm::APInt ConstVal(32, 1);
3108  QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3109 
3110  T = CGM.getContext().getConstantArrayType(ET, ConstVal, ArrayType::Normal,
3111  0);
3112  }
3113 
3114  Name = VD->getName();
3115  if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
3116  !isa<ObjCMethodDecl>(VD->getDeclContext()))
3117  LinkageName = CGM.getMangledName(VD);
3118  if (LinkageName == Name)
3119  LinkageName = StringRef();
3120 
3121  if (isa<VarTemplateSpecializationDecl>(VD)) {
3122  llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VD, &*Unit);
3123  TemplateParameters = parameterNodes.get();
3124  } else {
3125  TemplateParameters = nullptr;
3126  }
3127 
3128  // Since we emit declarations (DW_AT_members) for static members, place the
3129  // definition of those static members in the namespace they were declared in
3130  // in the source code (the lexical decl context).
3131  // FIXME: Generalize this for even non-member global variables where the
3132  // declaration and definition may have different lexical decl contexts, once
3133  // we have support for emitting declarations of (non-member) global variables.
3134  const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
3135  : VD->getDeclContext();
3136  // When a record type contains an in-line initialization of a static data
3137  // member, and the record type is marked as __declspec(dllexport), an implicit
3138  // definition of the member will be created in the record context. DWARF
3139  // doesn't seem to have a nice way to describe this in a form that consumers
3140  // are likely to understand, so fake the "normal" situation of a definition
3141  // outside the class by putting it in the global scope.
3142  if (DC->isRecord())
3143  DC = CGM.getContext().getTranslationUnitDecl();
3144 
3145  llvm::DIScope *Mod = getParentModuleOrNull(VD);
3146  VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
3147 }
3148 
3149 llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
3150  bool Stub) {
3151  llvm::DINodeArray TParamsArray;
3152  StringRef Name, LinkageName;
3153  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3154  SourceLocation Loc = GD.getDecl()->getLocation();
3155  llvm::DIFile *Unit = getOrCreateFile(Loc);
3156  llvm::DIScope *DContext = Unit;
3157  unsigned Line = getLineNumber(Loc);
3158  collectFunctionDeclProps(GD, Unit, Name, LinkageName, DContext, TParamsArray,
3159  Flags);
3160  auto *FD = dyn_cast<FunctionDecl>(GD.getDecl());
3161 
3162  // Build function type.
3163  SmallVector<QualType, 16> ArgTypes;
3164  if (FD)
3165  for (const ParmVarDecl *Parm : FD->parameters())
3166  ArgTypes.push_back(Parm->getType());
3167  CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
3168  QualType FnType = CGM.getContext().getFunctionType(
3169  FD->getReturnType(), ArgTypes, FunctionProtoType::ExtProtoInfo(CC));
3170  if (Stub) {
3171  Flags |= getCallSiteRelatedAttrs();
3172  return DBuilder.createFunction(
3173  DContext, Name, LinkageName, Unit, Line,
3174  getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
3175  !FD->isExternallyVisible(),
3176  /* isDefinition = */ true, 0, Flags, CGM.getLangOpts().Optimize,
3177  TParamsArray.get(), getFunctionDeclaration(FD));
3178  }
3179 
3180  llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
3181  DContext, Name, LinkageName, Unit, Line,
3182  getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
3183  !FD->isExternallyVisible(),
3184  /* isDefinition = */ false, 0, Flags, CGM.getLangOpts().Optimize,
3185  TParamsArray.get(), getFunctionDeclaration(FD));
3186  const FunctionDecl *CanonDecl = FD->getCanonicalDecl();
3187  FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
3188  std::make_tuple(CanonDecl),
3189  std::make_tuple(SP));
3190  return SP;
3191 }
3192 
3193 llvm::DISubprogram *CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
3194  return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
3195 }
3196 
3197 llvm::DISubprogram *CGDebugInfo::getFunctionStub(GlobalDecl GD) {
3198  return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
3199 }
3200 
3201 llvm::DIGlobalVariable *
3202 CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
3203  QualType T;
3204  StringRef Name, LinkageName;
3205  SourceLocation Loc = VD->getLocation();
3206  llvm::DIFile *Unit = getOrCreateFile(Loc);
3207  llvm::DIScope *DContext = Unit;
3208  unsigned Line = getLineNumber(Loc);
3209  llvm::MDTuple *TemplateParameters = nullptr;
3210 
3211  collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, TemplateParameters,
3212  DContext);
3213  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3214  auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
3215  DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
3216  !VD->isExternallyVisible(), nullptr, TemplateParameters, Align);
3217  FwdDeclReplaceMap.emplace_back(
3218  std::piecewise_construct,
3219  std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
3220  std::make_tuple(static_cast<llvm::Metadata *>(GV)));
3221  return GV;
3222 }
3223 
3224 llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
3225  // We only need a declaration (not a definition) of the type - so use whatever
3226  // we would otherwise do to get a type for a pointee. (forward declarations in
3227  // limited debug info, full definitions (if the type definition is available)
3228  // in unlimited debug info)
3229  if (const auto *TD = dyn_cast<TypeDecl>(D))
3230  return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
3231  getOrCreateFile(TD->getLocation()));
3232  auto I = DeclCache.find(D->getCanonicalDecl());
3233 
3234  if (I != DeclCache.end()) {
3235  auto N = I->second;
3236  if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(N))
3237  return GVE->getVariable();
3238  return dyn_cast_or_null<llvm::DINode>(N);
3239  }
3240 
3241  // No definition for now. Emit a forward definition that might be
3242  // merged with a potential upcoming definition.
3243  if (const auto *FD = dyn_cast<FunctionDecl>(D))
3244  return getFunctionForwardDeclaration(FD);
3245  else if (const auto *VD = dyn_cast<VarDecl>(D))
3246  return getGlobalVariableForwardDeclaration(VD);
3247 
3248  return nullptr;
3249 }
3250 
3251 llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
3252  if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3253  return nullptr;
3254 
3255  const auto *FD = dyn_cast<FunctionDecl>(D);
3256  if (!FD)
3257  return nullptr;
3258 
3259  // Setup context.
3260  auto *S = getDeclContextDescriptor(D);
3261 
3262  auto MI = SPCache.find(FD->getCanonicalDecl());
3263  if (MI == SPCache.end()) {
3264  if (const auto *MD = dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
3265  return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
3266  cast<llvm::DICompositeType>(S));
3267  }
3268  }
3269  if (MI != SPCache.end()) {
3270  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3271  if (SP && !SP->isDefinition())
3272  return SP;
3273  }
3274 
3275  for (auto NextFD : FD->redecls()) {
3276  auto MI = SPCache.find(NextFD->getCanonicalDecl());
3277  if (MI != SPCache.end()) {
3278  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3279  if (SP && !SP->isDefinition())
3280  return SP;
3281  }
3282  }
3283  return nullptr;
3284 }
3285 
3286 // getOrCreateFunctionType - Construct type. If it is a c++ method, include
3287 // implicit parameter "this".
3288 llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
3289  QualType FnType,
3290  llvm::DIFile *F) {
3291  if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3292  // Create fake but valid subroutine type. Otherwise -verify would fail, and
3293  // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
3294  return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
3295 
3296  if (const auto *Method = dyn_cast<CXXMethodDecl>(D))
3297  return getOrCreateMethodType(Method, F);
3298 
3299  const auto *FTy = FnType->getAs<FunctionType>();
3300  CallingConv CC = FTy ? FTy->getCallConv() : CallingConv::CC_C;
3301 
3302  if (const auto *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
3303  // Add "self" and "_cmd"
3305 
3306  // First element is always return type. For 'void' functions it is NULL.
3307  QualType ResultTy = OMethod->getReturnType();
3308 
3309  // Replace the instancetype keyword with the actual type.
3310  if (ResultTy == CGM.getContext().getObjCInstanceType())
3311  ResultTy = CGM.getContext().getPointerType(
3312  QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
3313 
3314  Elts.push_back(getOrCreateType(ResultTy, F));
3315  // "self" pointer is always first argument.
3316  QualType SelfDeclTy;
3317  if (auto *SelfDecl = OMethod->getSelfDecl())
3318  SelfDeclTy = SelfDecl->getType();
3319  else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3320  if (FPT->getNumParams() > 1)
3321  SelfDeclTy = FPT->getParamType(0);
3322  if (!SelfDeclTy.isNull())
3323  Elts.push_back(
3324  CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
3325  // "_cmd" pointer is always second argument.
3326  Elts.push_back(DBuilder.createArtificialType(
3327  getOrCreateType(CGM.getContext().getObjCSelType(), F)));
3328  // Get rest of the arguments.
3329  for (const auto *PI : OMethod->parameters())
3330  Elts.push_back(getOrCreateType(PI->getType(), F));
3331  // Variadic methods need a special marker at the end of the type list.
3332  if (OMethod->isVariadic())
3333  Elts.push_back(DBuilder.createUnspecifiedParameter());
3334 
3335  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
3336  return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3337  getDwarfCC(CC));
3338  }
3339 
3340  // Handle variadic function types; they need an additional
3341  // unspecified parameter.
3342  if (const auto *FD = dyn_cast<FunctionDecl>(D))
3343  if (FD->isVariadic()) {
3345  EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
3346  if (const auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3347  for (QualType ParamType : FPT->param_types())
3348  EltTys.push_back(getOrCreateType(ParamType, F));
3349  EltTys.push_back(DBuilder.createUnspecifiedParameter());
3350  llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
3351  return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3352  getDwarfCC(CC));
3353  }
3354 
3355  return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
3356 }
3357 
3359  SourceLocation ScopeLoc, QualType FnType,
3360  llvm::Function *Fn, bool CurFuncIsThunk,
3361  CGBuilderTy &Builder) {
3362 
3363  StringRef Name;
3364  StringRef LinkageName;
3365 
3366  FnBeginRegionCount.push_back(LexicalBlockStack.size());
3367 
3368  const Decl *D = GD.getDecl();
3369  bool HasDecl = (D != nullptr);
3370 
3371  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3372  llvm::DIFile *Unit = getOrCreateFile(Loc);
3373  llvm::DIScope *FDContext = Unit;
3374  llvm::DINodeArray TParamsArray;
3375  if (!HasDecl) {
3376  // Use llvm function name.
3377  LinkageName = Fn->getName();
3378  } else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
3379  // If there is a subprogram for this function available then use it.
3380  auto FI = SPCache.find(FD->getCanonicalDecl());
3381  if (FI != SPCache.end()) {
3382  auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3383  if (SP && SP->isDefinition()) {
3384  LexicalBlockStack.emplace_back(SP);
3385  RegionMap[D].reset(SP);
3386  return;
3387  }
3388  }
3389  collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3390  TParamsArray, Flags);
3391  } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3392  Name = getObjCMethodName(OMD);
3393  Flags |= llvm::DINode::FlagPrototyped;
3394  } else {
3395  // Use llvm function name.
3396  Name = Fn->getName();
3397  Flags |= llvm::DINode::FlagPrototyped;
3398  }
3399  if (Name.startswith("\01"))
3400  Name = Name.substr(1);
3401 
3402  if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>()) {
3403  Flags |= llvm::DINode::FlagArtificial;
3404  // Artificial functions should not silently reuse CurLoc.
3405  CurLoc = SourceLocation();
3406  }
3407 
3408  if (CurFuncIsThunk)
3409  Flags |= llvm::DINode::FlagThunk;
3410 
3411  llvm::DINode::DIFlags FlagsForDef = Flags | getCallSiteRelatedAttrs();
3412 
3413  unsigned LineNo = getLineNumber(Loc);
3414  unsigned ScopeLine = getLineNumber(ScopeLoc);
3415 
3416  // FIXME: The function declaration we're constructing here is mostly reusing
3417  // declarations from CXXMethodDecl and not constructing new ones for arbitrary
3418  // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
3419  // all subprograms instead of the actual context since subprogram definitions
3420  // are emitted as CU level entities by the backend.
3421  llvm::DISubprogram *SP = DBuilder.createFunction(
3422  FDContext, Name, LinkageName, Unit, LineNo,
3423  getOrCreateFunctionType(D, FnType, Unit), Fn->hasLocalLinkage(),
3424  true /*definition*/, ScopeLine, FlagsForDef, CGM.getLangOpts().Optimize,
3425  TParamsArray.get(), getFunctionDeclaration(D));
3426  Fn->setSubprogram(SP);
3427  // We might get here with a VarDecl in the case we're generating
3428  // code for the initialization of globals. Do not record these decls
3429  // as they will overwrite the actual VarDecl Decl in the cache.
3430  if (HasDecl && isa<FunctionDecl>(D))
3431  DeclCache[D->getCanonicalDecl()].reset(SP);
3432 
3433  if (CGM.getCodeGenOpts().DwarfVersion >= 5) {
3434  // Starting with DWARF V5 method declarations are emitted as children of
3435  // the interface type.
3436  if (const auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(D)) {
3437  const ObjCInterfaceDecl *ID = OMD->getClassInterface();
3438  QualType QTy(ID->getTypeForDecl(), 0);
3439  auto It = TypeCache.find(QTy.getAsOpaquePtr());
3440  if (It != TypeCache.end()) {
3441  llvm::DICompositeType *InterfaceDecl =
3442  cast<llvm::DICompositeType>(It->second);
3443  llvm::DISubprogram *FD = DBuilder.createFunction(
3444  InterfaceDecl, Name, LinkageName, Unit, LineNo,
3445  getOrCreateFunctionType(D, FnType, Unit), Fn->hasLocalLinkage(),
3446  false /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
3447  TParamsArray.get());
3448  DBuilder.finalizeSubprogram(FD);
3449  ObjCMethodCache[ID].push_back(FD);
3450  }
3451  }
3452  }
3453 
3454  // Push the function onto the lexical block stack.
3455  LexicalBlockStack.emplace_back(SP);
3456 
3457  if (HasDecl)
3458  RegionMap[D].reset(SP);
3459 }
3460 
3462  QualType FnType) {
3463  StringRef Name;
3464  StringRef LinkageName;
3465 
3466  const Decl *D = GD.getDecl();
3467  if (!D)
3468  return;
3469 
3470  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3471  llvm::DIFile *Unit = getOrCreateFile(Loc);
3472  llvm::DIScope *FDContext = getDeclContextDescriptor(D);
3473  llvm::DINodeArray TParamsArray;
3474  if (isa<FunctionDecl>(D)) {
3475  // If there is a DISubprogram for this function available then use it.
3476  collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3477  TParamsArray, Flags);
3478  } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3479  Name = getObjCMethodName(OMD);
3480  Flags |= llvm::DINode::FlagPrototyped;
3481  } else {
3482  llvm_unreachable("not a function or ObjC method");
3483  }
3484  if (!Name.empty() && Name[0] == '\01')
3485  Name = Name.substr(1);
3486 
3487  if (D->isImplicit()) {
3488  Flags |= llvm::DINode::FlagArtificial;
3489  // Artificial functions without a location should not silently reuse CurLoc.
3490  if (Loc.isInvalid())
3491  CurLoc = SourceLocation();
3492  }
3493  unsigned LineNo = getLineNumber(Loc);
3494  unsigned ScopeLine = 0;
3495 
3496  DBuilder.retainType(DBuilder.createFunction(
3497  FDContext, Name, LinkageName, Unit, LineNo,
3498  getOrCreateFunctionType(D, FnType, Unit), false /*internalLinkage*/,
3499  false /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
3500  TParamsArray.get(), getFunctionDeclaration(D)));
3501 }
3502 
3504  const auto *FD = cast<FunctionDecl>(GD.getDecl());
3505  // If there is a subprogram for this function available then use it.
3506  auto FI = SPCache.find(FD->getCanonicalDecl());
3507  llvm::DISubprogram *SP = nullptr;
3508  if (FI != SPCache.end())
3509  SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3510  if (!SP || !SP->isDefinition())
3511  SP = getFunctionStub(GD);
3512  FnBeginRegionCount.push_back(LexicalBlockStack.size());
3513  LexicalBlockStack.emplace_back(SP);
3514  setInlinedAt(Builder.getCurrentDebugLocation());
3515  EmitLocation(Builder, FD->getLocation());
3516 }
3517 
3519  assert(CurInlinedAt && "unbalanced inline scope stack");
3520  EmitFunctionEnd(Builder, nullptr);
3521  setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
3522 }
3523 
3525  // Update our current location
3526  setLocation(Loc);
3527 
3528  if (CurLoc.isInvalid() || CurLoc.isMacroID())
3529  return;
3530 
3531  llvm::MDNode *Scope = LexicalBlockStack.back();
3532  Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
3533  getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope, CurInlinedAt));
3534 }
3535 
3536 void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
3537  llvm::MDNode *Back = nullptr;
3538  if (!LexicalBlockStack.empty())
3539  Back = LexicalBlockStack.back().get();
3540  LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
3541  cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
3542  getColumnNumber(CurLoc)));
3543 }
3544 
3545 void CGDebugInfo::AppendAddressSpaceXDeref(
3546  unsigned AddressSpace, SmallVectorImpl<int64_t> &Expr) const {
3547  Optional<unsigned> DWARFAddressSpace =
3548  CGM.getTarget().getDWARFAddressSpace(AddressSpace);
3549  if (!DWARFAddressSpace)
3550  return;
3551 
3552  Expr.push_back(llvm::dwarf::DW_OP_constu);
3553  Expr.push_back(DWARFAddressSpace.getValue());
3554  Expr.push_back(llvm::dwarf::DW_OP_swap);
3555  Expr.push_back(llvm::dwarf::DW_OP_xderef);
3556 }
3557 
3559  SourceLocation Loc) {
3560  // Set our current location.
3561  setLocation(Loc);
3562 
3563  // Emit a line table change for the current location inside the new scope.
3564  Builder.SetCurrentDebugLocation(
3565  llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc),
3566  LexicalBlockStack.back(), CurInlinedAt));
3567 
3568  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3569  return;
3570 
3571  // Create a new lexical block and push it on the stack.
3572  CreateLexicalBlock(Loc);
3573 }
3574 
3576  SourceLocation Loc) {
3577  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3578 
3579  // Provide an entry in the line table for the end of the block.
3580  EmitLocation(Builder, Loc);
3581 
3582  if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3583  return;
3584 
3585  LexicalBlockStack.pop_back();
3586 }
3587 
3588 void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn) {
3589  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3590  unsigned RCount = FnBeginRegionCount.back();
3591  assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
3592 
3593  // Pop all regions for this function.
3594  while (LexicalBlockStack.size() != RCount) {
3595  // Provide an entry in the line table for the end of the block.
3596  EmitLocation(Builder, CurLoc);
3597  LexicalBlockStack.pop_back();
3598  }
3599  FnBeginRegionCount.pop_back();
3600 
3601  if (Fn && Fn->getSubprogram())
3602  DBuilder.finalizeSubprogram(Fn->getSubprogram());
3603 }
3604 
3605 CGDebugInfo::BlockByRefType
3606 CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
3607  uint64_t *XOffset) {
3609  QualType FType;
3610  uint64_t FieldSize, FieldOffset;
3611  uint32_t FieldAlign;
3612 
3613  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3614  QualType Type = VD->getType();
3615 
3616  FieldOffset = 0;
3617  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3618  EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
3619  EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
3620  FType = CGM.getContext().IntTy;
3621  EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
3622  EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
3623 
3624  bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
3625  if (HasCopyAndDispose) {
3626  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3627  EltTys.push_back(
3628  CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
3629  EltTys.push_back(
3630  CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
3631  }
3632  bool HasByrefExtendedLayout;
3633  Qualifiers::ObjCLifetime Lifetime;
3634  if (CGM.getContext().getByrefLifetime(Type, Lifetime,
3635  HasByrefExtendedLayout) &&
3636  HasByrefExtendedLayout) {
3637  FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3638  EltTys.push_back(
3639  CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
3640  }
3641 
3642  CharUnits Align = CGM.getContext().getDeclAlign(VD);
3643  if (Align > CGM.getContext().toCharUnitsFromBits(
3644  CGM.getTarget().getPointerAlign(0))) {
3645  CharUnits FieldOffsetInBytes =
3646  CGM.getContext().toCharUnitsFromBits(FieldOffset);
3647  CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
3648  CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
3649 
3650  if (NumPaddingBytes.isPositive()) {
3651  llvm::APInt pad(32, NumPaddingBytes.getQuantity());
3652  FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
3653  pad, ArrayType::Normal, 0);
3654  EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
3655  }
3656  }
3657 
3658  FType = Type;
3659  llvm::DIType *WrappedTy = getOrCreateType(FType, Unit);
3660  FieldSize = CGM.getContext().getTypeSize(FType);
3661  FieldAlign = CGM.getContext().toBits(Align);
3662 
3663  *XOffset = FieldOffset;
3664  llvm::DIType *FieldTy = DBuilder.createMemberType(
3665  Unit, VD->getName(), Unit, 0, FieldSize, FieldAlign, FieldOffset,
3666  llvm::DINode::FlagZero, WrappedTy);
3667  EltTys.push_back(FieldTy);
3668  FieldOffset += FieldSize;
3669 
3670  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
3671  return {DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0,
3672  llvm::DINode::FlagZero, nullptr, Elements),
3673  WrappedTy};
3674 }
3675 
3676 llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
3677  llvm::Value *Storage,
3679  CGBuilderTy &Builder) {
3680  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3681  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3682  if (VD->hasAttr<NoDebugAttr>())
3683  return nullptr;
3684 
3685  bool Unwritten =
3686  VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
3687  cast<Decl>(VD->getDeclContext())->isImplicit());
3688  llvm::DIFile *Unit = nullptr;
3689  if (!Unwritten)
3690  Unit = getOrCreateFile(VD->getLocation());
3691  llvm::DIType *Ty;
3692  uint64_t XOffset = 0;
3693  if (VD->hasAttr<BlocksAttr>())
3694  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
3695  else
3696  Ty = getOrCreateType(VD->getType(), Unit);
3697 
3698  // If there is no debug info for this type then do not emit debug info
3699  // for this variable.
3700  if (!Ty)
3701  return nullptr;
3702 
3703  // Get location information.
3704  unsigned Line = 0;
3705  unsigned Column = 0;
3706  if (!Unwritten) {
3707  Line = getLineNumber(VD->getLocation());
3708  Column = getColumnNumber(VD->getLocation());
3709  }
3711  llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3712  if (VD->isImplicit())
3713  Flags |= llvm::DINode::FlagArtificial;
3714 
3715  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3716 
3717  unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(VD->getType());
3718  AppendAddressSpaceXDeref(AddressSpace, Expr);
3719 
3720  // If this is implicit parameter of CXXThis or ObjCSelf kind, then give it an
3721  // object pointer flag.
3722  if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD)) {
3723  if (IPD->getParameterKind() == ImplicitParamDecl::CXXThis ||
3724  IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
3725  Flags |= llvm::DINode::FlagObjectPointer;
3726  }
3727 
3728  // Note: Older versions of clang used to emit byval references with an extra
3729  // DW_OP_deref, because they referenced the IR arg directly instead of
3730  // referencing an alloca. Newer versions of LLVM don't treat allocas
3731  // differently from other function arguments when used in a dbg.declare.
3732  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
3733  StringRef Name = VD->getName();
3734  if (!Name.empty()) {
3735  if (VD->hasAttr<BlocksAttr>()) {
3736  // Here, we need an offset *into* the alloca.
3737  CharUnits offset = CharUnits::fromQuantity(32);
3738  Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3739  // offset of __forwarding field
3740  offset = CGM.getContext().toCharUnitsFromBits(
3741  CGM.getTarget().getPointerWidth(0));
3742  Expr.push_back(offset.getQuantity());
3743  Expr.push_back(llvm::dwarf::DW_OP_deref);
3744  Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3745  // offset of x field
3746  offset = CGM.getContext().toCharUnitsFromBits(XOffset);
3747  Expr.push_back(offset.getQuantity());
3748  }
3749  } else if (const auto *RT = dyn_cast<RecordType>(VD->getType())) {
3750  // If VD is an anonymous union then Storage represents value for
3751  // all union fields.
3752  const RecordDecl *RD = RT->getDecl();
3753  if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
3754  // GDB has trouble finding local variables in anonymous unions, so we emit
3755  // artificial local variables for each of the members.
3756  //
3757  // FIXME: Remove this code as soon as GDB supports this.
3758  // The debug info verifier in LLVM operates based on the assumption that a
3759  // variable has the same size as its storage and we had to disable the
3760  // check for artificial variables.
3761  for (const auto *Field : RD->fields()) {
3762  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
3763  StringRef FieldName = Field->getName();
3764 
3765  // Ignore unnamed fields. Do not ignore unnamed records.
3766  if (FieldName.empty() && !isa<RecordType>(Field->getType()))
3767  continue;
3768 
3769  // Use VarDecl's Tag, Scope and Line number.
3770  auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
3771  auto *D = DBuilder.createAutoVariable(
3772  Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
3773  Flags | llvm::DINode::FlagArtificial, FieldAlign);
3774 
3775  // Insert an llvm.dbg.declare into the current block.
3776  DBuilder.insertDeclare(
3777  Storage, D, DBuilder.createExpression(Expr),
3778  llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
3779  Builder.GetInsertBlock());
3780  }
3781  }
3782  }
3783 
3784  // Create the descriptor for the variable.
3785  auto *D = ArgNo ? DBuilder.createParameterVariable(
3786  Scope, Name, *ArgNo, Unit, Line, Ty,
3787  CGM.getLangOpts().Optimize, Flags)
3788  : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
3789  CGM.getLangOpts().Optimize,
3790  Flags, Align);
3791 
3792  // Insert an llvm.dbg.declare into the current block.
3793  DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
3794  llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
3795  Builder.GetInsertBlock());
3796 
3797  return D;
3798 }
3799 
3800 llvm::DILocalVariable *
3802  CGBuilderTy &Builder) {
3803  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3804  return EmitDeclare(VD, Storage, llvm::None, Builder);
3805 }
3806 
3807 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
3808  llvm::DIType *Ty) {
3809  llvm::DIType *CachedTy = getTypeOrNull(QualTy);
3810  if (CachedTy)
3811  Ty = CachedTy;
3812  return DBuilder.createObjectPointerType(Ty);
3813 }
3814 
3816  const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
3817  const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
3818  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3819  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3820 
3821  if (Builder.GetInsertBlock() == nullptr)
3822  return;
3823  if (VD->hasAttr<NoDebugAttr>())
3824  return;
3825 
3826  bool isByRef = VD->hasAttr<BlocksAttr>();
3827 
3828  uint64_t XOffset = 0;
3829  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3830  llvm::DIType *Ty;
3831  if (isByRef)
3832  Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
3833  else
3834  Ty = getOrCreateType(VD->getType(), Unit);
3835 
3836  // Self is passed along as an implicit non-arg variable in a
3837  // block. Mark it as the object pointer.
3838  if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD))
3839  if (IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
3840  Ty = CreateSelfType(VD->getType(), Ty);
3841 
3842  // Get location information.
3843  unsigned Line = getLineNumber(VD->getLocation());
3844  unsigned Column = getColumnNumber(VD->getLocation());
3845 
3846  const llvm::DataLayout &target = CGM.getDataLayout();
3847 
3849  target.getStructLayout(blockInfo.StructureType)
3850  ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
3851 
3853  addr.push_back(llvm::dwarf::DW_OP_deref);
3854  addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3855  addr.push_back(offset.getQuantity());
3856  if (isByRef) {
3857  addr.push_back(llvm::dwarf::DW_OP_deref);
3858  addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3859  // offset of __forwarding field
3860  offset =
3861  CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
3862  addr.push_back(offset.getQuantity());
3863  addr.push_back(llvm::dwarf::DW_OP_deref);
3864  addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3865  // offset of x field
3866  offset = CGM.getContext().toCharUnitsFromBits(XOffset);
3867  addr.push_back(offset.getQuantity());
3868  }
3869 
3870  // Create the descriptor for the variable.
3871  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3872  auto *D = DBuilder.createAutoVariable(
3873  cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
3874  Line, Ty, false, llvm::DINode::FlagZero, Align);
3875 
3876  // Insert an llvm.dbg.declare into the current block.
3877  auto DL =
3878  llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back(), CurInlinedAt);
3879  auto *Expr = DBuilder.createExpression(addr);
3880  if (InsertPoint)
3881  DBuilder.insertDeclare(Storage, D, Expr, DL, InsertPoint);
3882  else
3883  DBuilder.insertDeclare(Storage, D, Expr, DL, Builder.GetInsertBlock());
3884 }
3885 
3887  unsigned ArgNo,
3888  CGBuilderTy &Builder) {
3889  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3890  EmitDeclare(VD, AI, ArgNo, Builder);
3891 }
3892 
3893 namespace {
3894 struct BlockLayoutChunk {
3895  uint64_t OffsetInBits;
3896  const BlockDecl::Capture *Capture;
3897 };
3898 bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
3899  return l.OffsetInBits < r.OffsetInBits;
3900 }
3901 } // namespace
3902 
3903 void CGDebugInfo::collectDefaultFieldsForBlockLiteralDeclare(
3904  const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc,
3905  const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit,
3907  // Blocks in OpenCL have unique constraints which make the standard fields
3908  // redundant while requiring size and align fields for enqueue_kernel. See
3909  // initializeForBlockHeader in CGBlocks.cpp
3910  if (CGM.getLangOpts().OpenCL) {
3911  Fields.push_back(createFieldType("__size", Context.IntTy, Loc, AS_public,
3912  BlockLayout.getElementOffsetInBits(0),
3913  Unit, Unit));
3914  Fields.push_back(createFieldType("__align", Context.IntTy, Loc, AS_public,
3915  BlockLayout.getElementOffsetInBits(1),
3916  Unit, Unit));
3917  } else {
3918  Fields.push_back(createFieldType("__isa", Context.VoidPtrTy, Loc, AS_public,
3919  BlockLayout.getElementOffsetInBits(0),
3920  Unit, Unit));
3921  Fields.push_back(createFieldType("__flags", Context.IntTy, Loc, AS_public,
3922  BlockLayout.getElementOffsetInBits(1),
3923  Unit, Unit));
3924  Fields.push_back(
3925  createFieldType("__reserved", Context.IntTy, Loc, AS_public,
3926  BlockLayout.getElementOffsetInBits(2), Unit, Unit));
3927  auto *FnTy = Block.getBlockExpr()->getFunctionType();
3928  auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
3929  Fields.push_back(createFieldType("__FuncPtr", FnPtrType, Loc, AS_public,
3930  BlockLayout.getElementOffsetInBits(3),
3931  Unit, Unit));
3932  Fields.push_back(createFieldType(
3933  "__descriptor",
3934  Context.getPointerType(Block.NeedsCopyDispose
3935  ? Context.getBlockDescriptorExtendedType()
3936  : Context.getBlockDescriptorType()),
3937  Loc, AS_public, BlockLayout.getElementOffsetInBits(4), Unit, Unit));
3938  }
3939 }
3940 
3942  StringRef Name,
3943  unsigned ArgNo,
3944  llvm::AllocaInst *Alloca,
3945  CGBuilderTy &Builder) {
3946  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3947  ASTContext &C = CGM.getContext();
3948  const BlockDecl *blockDecl = block.getBlockDecl();
3949 
3950  // Collect some general information about the block's location.
3951  SourceLocation loc = blockDecl->getCaretLocation();
3952  llvm::DIFile *tunit = getOrCreateFile(loc);
3953  unsigned line = getLineNumber(loc);
3954  unsigned column = getColumnNumber(loc);
3955 
3956  // Build the debug-info type for the block literal.
3957  getDeclContextDescriptor(blockDecl);
3958 
3959  const llvm::StructLayout *blockLayout =
3960  CGM.getDataLayout().getStructLayout(block.StructureType);
3961 
3963  collectDefaultFieldsForBlockLiteralDeclare(block, C, loc, *blockLayout, tunit,
3964  fields);
3965 
3966  // We want to sort the captures by offset, not because DWARF
3967  // requires this, but because we're paranoid about debuggers.
3969 
3970  // 'this' capture.
3971  if (blockDecl->capturesCXXThis()) {
3972  BlockLayoutChunk chunk;
3973  chunk.OffsetInBits =
3974  blockLayout->getElementOffsetInBits(block.CXXThisIndex);
3975  chunk.Capture = nullptr;
3976  chunks.push_back(chunk);
3977  }
3978 
3979  // Variable captures.
3980  for (const auto &capture : blockDecl->captures()) {
3981  const VarDecl *variable = capture.getVariable();
3982  const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
3983 
3984  // Ignore constant captures.
3985  if (captureInfo.isConstant())
3986  continue;
3987 
3988  BlockLayoutChunk chunk;
3989  chunk.OffsetInBits =
3990  blockLayout->getElementOffsetInBits(captureInfo.getIndex());
3991  chunk.Capture = &capture;
3992  chunks.push_back(chunk);
3993  }
3994 
3995  // Sort by offset.
3996  llvm::array_pod_sort(chunks.begin(), chunks.end());
3997 
3998  for (const BlockLayoutChunk &Chunk : chunks) {
3999  uint64_t offsetInBits = Chunk.OffsetInBits;
4000  const BlockDecl::Capture *capture = Chunk.Capture;
4001 
4002  // If we have a null capture, this must be the C++ 'this' capture.
4003  if (!capture) {
4004  QualType type;
4005  if (auto *Method =
4006  cast_or_null<CXXMethodDecl>(blockDecl->getNonClosureContext()))
4007  type = Method->getThisType(C);
4008  else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
4009  type = QualType(RDecl->getTypeForDecl(), 0);
4010  else
4011  llvm_unreachable("unexpected block declcontext");
4012 
4013  fields.push_back(createFieldType("this", type, loc, AS_public,
4014  offsetInBits, tunit, tunit));
4015  continue;
4016  }
4017 
4018  const VarDecl *variable = capture->getVariable();
4019  StringRef name = variable->getName();
4020 
4021  llvm::DIType *fieldType;
4022  if (capture->isByRef()) {
4023  TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
4024  auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
4025  // FIXME: This recomputes the layout of the BlockByRefWrapper.
4026  uint64_t xoffset;
4027  fieldType =
4028  EmitTypeForVarWithBlocksAttr(variable, &xoffset).BlockByRefWrapper;
4029  fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
4030  fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
4031  PtrInfo.Width, Align, offsetInBits,
4032  llvm::DINode::FlagZero, fieldType);
4033  } else {
4034  auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
4035  fieldType = createFieldType(name, variable->getType(), loc, AS_public,
4036  offsetInBits, Align, tunit, tunit);
4037  }
4038  fields.push_back(fieldType);
4039  }
4040 
4041  SmallString<36> typeName;
4042  llvm::raw_svector_ostream(typeName)
4043  << "__block_literal_" << CGM.getUniqueBlockCount();
4044 
4045  llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
4046 
4047  llvm::DIType *type =
4048  DBuilder.createStructType(tunit, typeName.str(), tunit, line,
4049  CGM.getContext().toBits(block.BlockSize), 0,
4050  llvm::DINode::FlagZero, nullptr, fieldsArray);
4051  type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
4052 
4053  // Get overall information about the block.
4054  llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
4055  auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
4056 
4057  // Create the descriptor for the parameter.
4058  auto *debugVar = DBuilder.createParameterVariable(
4059  scope, Name, ArgNo, tunit, line, type, CGM.getLangOpts().Optimize, flags);
4060 
4061  // Insert an llvm.dbg.declare into the current block.
4062  DBuilder.insertDeclare(Alloca, debugVar, DBuilder.createExpression(),
4063  llvm::DebugLoc::get(line, column, scope, CurInlinedAt),
4064  Builder.GetInsertBlock());
4065 }
4066 
4067 llvm::DIDerivedType *
4068 CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
4069  if (!D->isStaticDataMember())
4070  return nullptr;
4071 
4072  auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
4073  if (MI != StaticDataMemberCache.end()) {
4074  assert(MI->second && "Static data member declaration should still exist");
4075  return MI->second;
4076  }
4077 
4078  // If the member wasn't found in the cache, lazily construct and add it to the
4079  // type (used when a limited form of the type is emitted).
4080  auto DC = D->getDeclContext();
4081  auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
4082  return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
4083 }
4084 
4085 llvm::DIGlobalVariableExpression *CGDebugInfo::CollectAnonRecordDecls(
4086  const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
4087  StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
4088  llvm::DIGlobalVariableExpression *GVE = nullptr;
4089 
4090  for (const auto *Field : RD->fields()) {
4091  llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
4092  StringRef FieldName = Field->getName();
4093 
4094  // Ignore unnamed fields, but recurse into anonymous records.
4095  if (FieldName.empty()) {
4096  if (const auto *RT = dyn_cast<RecordType>(Field->getType()))
4097  GVE = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
4098  Var, DContext);
4099  continue;
4100  }
4101  // Use VarDecl's Tag, Scope and Line number.
4102  GVE = DBuilder.createGlobalVariableExpression(
4103  DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
4104  Var->hasLocalLinkage());
4105  Var->addDebugInfo(GVE);
4106  }
4107  return GVE;
4108 }
4109 
4110 void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
4111  const VarDecl *D) {
4112  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4113  if (D->hasAttr<NoDebugAttr>())
4114  return;
4115 
4116  // If we already created a DIGlobalVariable for this declaration, just attach
4117  // it to the llvm::GlobalVariable.
4118  auto Cached = DeclCache.find(D->getCanonicalDecl());
4119  if (Cached != DeclCache.end())
4120  return Var->addDebugInfo(
4121  cast<llvm::DIGlobalVariableExpression>(Cached->second));
4122 
4123  // Create global variable debug descriptor.
4124  llvm::DIFile *Unit = nullptr;
4125  llvm::DIScope *DContext = nullptr;
4126  unsigned LineNo;
4127  StringRef DeclName, LinkageName;
4128  QualType T;
4129  llvm::MDTuple *TemplateParameters = nullptr;
4130  collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName,
4131  TemplateParameters, DContext);
4132 
4133  // Attempt to store one global variable for the declaration - even if we
4134  // emit a lot of fields.
4135  llvm::DIGlobalVariableExpression *GVE = nullptr;
4136 
4137  // If this is an anonymous union then we'll want to emit a global
4138  // variable for each member of the anonymous union so that it's possible
4139  // to find the name of any field in the union.
4140  if (T->isUnionType() && DeclName.empty()) {
4141  const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
4142  assert(RD->isAnonymousStructOrUnion() &&
4143  "unnamed non-anonymous struct or union?");
4144  GVE = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
4145  } else {
4146  auto Align = getDeclAlignIfRequired(D, CGM.getContext());
4147 
4149  unsigned AddressSpace =
4150  CGM.getContext().getTargetAddressSpace(D->getType());
4151  AppendAddressSpaceXDeref(AddressSpace, Expr);
4152 
4153  GVE = DBuilder.createGlobalVariableExpression(
4154  DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
4155  Var->hasLocalLinkage(),
4156  Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
4157  getOrCreateStaticDataMemberDeclarationOrNull(D), TemplateParameters,
4158  Align);
4159  Var->addDebugInfo(GVE);
4160  }
4161  DeclCache[D->getCanonicalDecl()].reset(GVE);
4162 }
4163 
4164 void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
4165  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4166  if (VD->hasAttr<NoDebugAttr>())
4167  return;
4168  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4169  // Create the descriptor for the variable.
4170  llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4171  StringRef Name = VD->getName();
4172  llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
4173  if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
4174  const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
4175  assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
4176  Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
4177  }
4178  // Do not use global variables for enums.
4179  //
4180  // FIXME: why not?
4181  if (Ty->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
4182  return;
4183  // Do not emit separate definitions for function local const/statics.
4184  if (isa<FunctionDecl>(VD->getDeclContext()))
4185  return;
4186  VD = cast<ValueDecl>(VD->getCanonicalDecl());
4187  auto *VarD = cast<VarDecl>(VD);
4188  if (VarD->isStaticDataMember()) {
4189  auto *RD = cast<RecordDecl>(VarD->getDeclContext());
4190  getDeclContextDescriptor(VarD);
4191  // Ensure that the type is retained even though it's otherwise unreferenced.
4192  //
4193  // FIXME: This is probably unnecessary, since Ty should reference RD
4194  // through its scope.
4195  RetainedTypes.push_back(
4196  CGM.getContext().getRecordType(RD).getAsOpaquePtr());
4197  return;
4198  }
4199 
4200  llvm::DIScope *DContext = getDeclContextDescriptor(VD);
4201 
4202  auto &GV = DeclCache[VD];
4203  if (GV)
4204  return;
4205  llvm::DIExpression *InitExpr = nullptr;
4206  if (CGM.getContext().getTypeSize(VD->getType()) <= 64) {
4207  // FIXME: Add a representation for integer constants wider than 64 bits.
4208  if (Init.isInt())
4209  InitExpr =
4210  DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
4211  else if (Init.isFloat())
4212  InitExpr = DBuilder.createConstantValueExpression(
4213  Init.getFloat().bitcastToAPInt().getZExtValue());
4214  }
4215 
4216  llvm::MDTuple *TemplateParameters = nullptr;
4217 
4218  if (isa<VarTemplateSpecializationDecl>(VD))
4219  if (VarD) {
4220  llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VarD, &*Unit);
4221  TemplateParameters = parameterNodes.get();
4222  }
4223 
4224  GV.reset(DBuilder.createGlobalVariableExpression(
4225  DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
4226  true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
4227  TemplateParameters, Align));
4228 }
4229 
4230 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
4231  if (!LexicalBlockStack.empty())
4232  return LexicalBlockStack.back();
4233  llvm::DIScope *Mod = getParentModuleOrNull(D);
4234  return getContextDescriptor(D, Mod ? Mod : TheCU);
4235 }
4236 
4238  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4239  return;
4240  const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
4241  if (!NSDecl->isAnonymousNamespace() ||
4242  CGM.getCodeGenOpts().DebugExplicitImport) {
4243  auto Loc = UD.getLocation();
4244  DBuilder.createImportedModule(
4245  getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
4246  getOrCreateNamespace(NSDecl), getOrCreateFile(Loc), getLineNumber(Loc));
4247  }
4248 }
4249 
4251  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4252  return;
4253  assert(UD.shadow_size() &&
4254  "We shouldn't be codegening an invalid UsingDecl containing no decls");
4255  // Emitting one decl is sufficient - debuggers can detect that this is an
4256  // overloaded name & provide lookup for all the overloads.
4257  const UsingShadowDecl &USD = **UD.shadow_begin();
4258 
4259  // FIXME: Skip functions with undeduced auto return type for now since we
4260  // don't currently have the plumbing for separate declarations & definitions
4261  // of free functions and mismatched types (auto in the declaration, concrete
4262  // return type in the definition)
4263  if (const auto *FD = dyn_cast<FunctionDecl>(USD.getUnderlyingDecl()))
4264  if (const auto *AT =
4265  FD->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
4266  if (AT->getDeducedType().isNull())
4267  return;
4268  if (llvm::DINode *Target =
4269  getDeclarationOrDefinition(USD.getUnderlyingDecl())) {
4270  auto Loc = USD.getLocation();
4271  DBuilder.createImportedDeclaration(
4272  getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
4273  getOrCreateFile(Loc), getLineNumber(Loc));
4274  }
4275 }
4276 
4278  if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
4279  return;
4280  if (Module *M = ID.getImportedModule()) {
4282  auto Loc = ID.getLocation();
4283  DBuilder.createImportedDeclaration(
4284  getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
4285  getOrCreateModuleRef(Info, DebugTypeExtRefs), getOrCreateFile(Loc),
4286  getLineNumber(Loc));
4287  }
4288 }
4289 
4290 llvm::DIImportedEntity *
4292  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4293  return nullptr;
4294  auto &VH = NamespaceAliasCache[&NA];
4295  if (VH)
4296  return cast<llvm::DIImportedEntity>(VH);
4297  llvm::DIImportedEntity *R;
4298  auto Loc = NA.getLocation();
4299  if (const auto *Underlying =
4300  dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
4301  // This could cache & dedup here rather than relying on metadata deduping.
4302  R = DBuilder.createImportedDeclaration(
4303  getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4304  EmitNamespaceAlias(*Underlying), getOrCreateFile(Loc),
4305  getLineNumber(Loc), NA.getName());
4306  else
4307  R = DBuilder.createImportedDeclaration(
4308  getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4309  getOrCreateNamespace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
4310  getOrCreateFile(Loc), getLineNumber(Loc), NA.getName());
4311  VH.reset(R);
4312  return R;
4313 }
4314 
4315 llvm::DINamespace *
4316 CGDebugInfo::getOrCreateNamespace(const NamespaceDecl *NSDecl) {
4317  // Don't canonicalize the NamespaceDecl here: The DINamespace will be uniqued
4318  // if necessary, and this way multiple declarations of the same namespace in
4319  // different parent modules stay distinct.
4320  auto I = NamespaceCache.find(NSDecl);
4321  if (I != NamespaceCache.end())
4322  return cast<llvm::DINamespace>(I->second);
4323 
4324  llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
4325  // Don't trust the context if it is a DIModule (see comment above).
4326  llvm::DINamespace *NS =
4327  DBuilder.createNameSpace(Context, NSDecl->getName(), NSDecl->isInline());
4328  NamespaceCache[NSDecl].reset(NS);
4329  return NS;
4330 }
4331 
4332 void CGDebugInfo::setDwoId(uint64_t Signature) {
4333  assert(TheCU && "no main compile unit");
4334  TheCU->setDWOId(Signature);
4335 }
4336 
4338  // Creating types might create further types - invalidating the current
4339  // element and the size(), so don't cache/reference them.
4340  for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
4341  ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
4342  llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
4343  ? CreateTypeDefinition(E.Type, E.Unit)
4344  : E.Decl;
4345  DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
4346  }
4347 
4348  if (CGM.getCodeGenOpts().DwarfVersion >= 5) {
4349  // Add methods to interface.
4350  for (const auto &P : ObjCMethodCache) {
4351  if (P.second.empty())
4352  continue;
4353 
4354  QualType QTy(P.first->getTypeForDecl(), 0);
4355  auto It = TypeCache.find(QTy.getAsOpaquePtr());
4356  assert(It != TypeCache.end());
4357 
4358  llvm::DICompositeType *InterfaceDecl =
4359  cast<llvm::DICompositeType>(It->second);
4360 
4362  auto CurrenetElts = InterfaceDecl->getElements();
4363  EltTys.append(CurrenetElts.begin(), CurrenetElts.end());
4364  for (auto &MD : P.second)
4365  EltTys.push_back(MD);
4366  llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
4367  DBuilder.replaceArrays(InterfaceDecl, Elements);
4368  }
4369  }
4370 
4371  for (const auto &P : ReplaceMap) {
4372  assert(P.second);
4373  auto *Ty = cast<llvm::DIType>(P.second);
4374  assert(Ty->isForwardDecl());
4375 
4376  auto It = TypeCache.find(P.first);
4377  assert(It != TypeCache.end());
4378  assert(It->second);
4379 
4380  DBuilder.replaceTemporary(llvm::TempDIType(Ty),
4381  cast<llvm::DIType>(It->second));
4382  }
4383 
4384  for (const auto &P : FwdDeclReplaceMap) {
4385  assert(P.second);
4386  llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(P.second));
4387  llvm::Metadata *Repl;
4388 
4389  auto It = DeclCache.find(P.first);
4390  // If there has been no definition for the declaration, call RAUW
4391  // with ourselves, that will destroy the temporary MDNode and
4392  // replace it with a standard one, avoiding leaking memory.
4393  if (It == DeclCache.end())
4394  Repl = P.second;
4395  else
4396  Repl = It->second;
4397 
4398  if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(Repl))
4399  Repl = GVE->getVariable();
4400  DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
4401  }
4402 
4403  // We keep our own list of retained types, because we need to look
4404  // up the final type in the type cache.
4405  for (auto &RT : RetainedTypes)
4406  if (auto MD = TypeCache[RT])
4407  DBuilder.retainType(cast<llvm::DIType>(MD));
4408 
4409  DBuilder.finalize();
4410 }
4411 
4413  if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4414  return;
4415 
4416  if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
4417  // Don't ignore in case of explicit cast where it is referenced indirectly.
4418  DBuilder.retainType(DieTy);
4419 }
4420 
4422  if (LexicalBlockStack.empty())
4423  return llvm::DebugLoc();
4424 
4425  llvm::MDNode *Scope = LexicalBlockStack.back();
4426  return llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc), Scope);
4427 }
4428 
4429 llvm::DINode::DIFlags CGDebugInfo::getCallSiteRelatedAttrs() const {
4430  // Call site-related attributes are only useful in optimized programs, and
4431  // when there's a possibility of debugging backtraces.
4432  if (!CGM.getLangOpts().Optimize || DebugKind == codegenoptions::NoDebugInfo ||
4433  DebugKind == codegenoptions::LocTrackingOnly)
4434  return llvm::DINode::FlagZero;
4435 
4436  // Call site-related attributes are available in DWARF v5. Some debuggers,
4437  // while not fully DWARF v5-compliant, may accept these attributes as if they
4438  // were part of DWARF v4.
4439  bool SupportsDWARFv4Ext =
4440  CGM.getCodeGenOpts().DwarfVersion == 4 &&
4441  CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB;
4442  if (!SupportsDWARFv4Ext && CGM.getCodeGenOpts().DwarfVersion < 5)
4443  return llvm::DINode::FlagZero;
4444 
4445  return llvm::DINode::FlagAllCallsDescribed;
4446 }
bool isNoReturn() const
Determines whether this function is known to be &#39;noreturn&#39;, through an attribute on its declaration o...
Definition: Decl.cpp:2931
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Defines the clang::ASTContext interface.
CharUnits alignTo(const CharUnits &Align) const
alignTo - Returns the next integer (mod 2**64) that is greater than or equal to this quantity and is ...
Definition: CharUnits.h:184
const Type * getTypeForDecl() const
Definition: DeclObjC.h:1911
VarDecl * getCapturedVar() const
Retrieve the declaration of the local variable being captured.
bool isStruct() const
Definition: Decl.h:3241
const Capture & getCapture(const VarDecl *var) const
Definition: CGBlocks.h:271
Represents a function declaration or definition.
Definition: Decl.h:1732
FunctionTemplateDecl * getTemplate() const
Retrieve the template from which this function was specialized.
Definition: DeclTemplate.h:550
StringRef Identifier
Definition: Format.cpp:1627
static bool hasDefaultSetterName(const ObjCPropertyDecl *PD, const ObjCMethodDecl *Setter)
bool isObjCQualifiedIdType() const
True if this is equivalent to &#39;id.
Definition: Type.h:5847
const FunctionProtoType * getFunctionType() const
getFunctionType - Return the underlying function type for this block.
Definition: Expr.cpp:2081
Smart pointer class that efficiently represents Objective-C method names.
A class which contains all the information about a particular captured value.
Definition: Decl.h:3856
Module * getOwningModule() const
Get the module that owns this declaration (for visibility purposes).
Definition: DeclBase.h:752
StringRef getName(const PrintingPolicy &Policy) const
Definition: Type.cpp:2648
if(T->getSizeExpr()) TRY_TO(TraverseStmt(T -> getSizeExpr()))
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2533
QualType getElementType() const
Definition: Type.h:5990
CanQualType VoidPtrTy
Definition: ASTContext.h:1053
QualType getPointeeType() const
Definition: Type.h:2546
void EmitLocation(raw_ostream &o, const SourceManager &SM, SourceLocation L, const FIDMap &FM, unsigned indent)
Definition: PlistSupport.h:108
bool isPrimaryBaseVirtual() const
isPrimaryBaseVirtual - Get whether the primary base for this record is virtual or not...
Definition: RecordLayout.h:226
static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx)
Definition: CGDebugInfo.cpp:52
A (possibly-)qualified type.
Definition: Type.h:642
base_class_range bases()
Definition: DeclCXX.h:823
const CodeGenOptions & getCodeGenOpts() const
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1144
void EmitExplicitCastType(QualType Ty)
Emit the type explicitly casted to.
void print(raw_ostream &OS, const PrintingPolicy &Policy, const Twine &PlaceHolder=Twine(), unsigned Indentation=0) const
Definition: Type.h:985
static ClassTemplateDecl * getDefinition(ClassTemplateDecl *D)
ArrayRef< TemplateArgument > getPackAsArray() const
Return the array of arguments in this template argument pack.
Definition: TemplateBase.h:366
Defines the clang::FileManager interface and associated types.
bool isMemberDataPointerType() const
Definition: Type.h:6312
QualType getDesugaredType(const ASTContext &Context) const
Return the specified type with any "sugar" removed from the type.
Definition: Type.h:942
std::string getClangFullVersion()
Retrieves a string representing the complete clang version, which includes the clang version number...
Definition: Version.cpp:118
TypePropertyCache< Private > Cache
Definition: Type.cpp:3465
llvm::DIType * getOrCreateRecordType(QualType Ty, SourceLocation L)
Emit record type&#39;s standalone debug info.
Kind getKind() const
Definition: Type.h:2414
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3351
void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc)
Emit metadata to indicate the end of a new lexical block and pop the current block.
CharUnits getBaseClassOffset(const CXXRecordDecl *Base) const
getBaseClassOffset - Get the offset, in chars, for the given base class.
Definition: RecordLayout.h:233
Defines the SourceManager interface.
static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind, bool DebugTypeExtRefs, const RecordDecl *RD, const LangOptions &LangOpts)
The template argument is an expression, and we&#39;ve not resolved it to one of the other forms yet...
Definition: TemplateBase.h:87
bool isRecordType() const
Definition: Type.h:6343
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1939
const Type * getTypeForDecl() const
Definition: Decl.h:2890
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:87
TagDecl * getDecl() const
Definition: Type.cpp:3147
bool isVirtual() const
Definition: DeclCXX.h:2086
Selector getObjCSelector() const
Get the Objective-C selector stored in this declaration name.
Defines the C++ template declaration subclasses.
StringRef P
Parameter for C++ &#39;this&#39; argument.
Definition: Decl.h:1502
static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C)
static bool hasDefaultGetterName(const ObjCPropertyDecl *PD, const ObjCMethodDecl *Getter)
The base class of the type hierarchy.
Definition: Type.h:1415
Represents an array type, per C99 6.7.5.2 - Array Declarators.
Definition: Type.h:2808
Declaration of a variable template.
The template argument is a declaration that was provided for a pointer, reference, or pointer to member non-type template parameter.
Definition: TemplateBase.h:64
Represent a C++ namespace.
Definition: Decl.h:514
NamedDecl * getParam(unsigned Idx)
Definition: DeclTemplate.h:133
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:98
QualType getValueType() const
Gets the type contained by this atomic type, i.e.
Definition: Type.h:5957
static bool needsTypeIdentifier(const TagDecl *TD, CodeGenModule &CGM, llvm::DICompileUnit *TheCU)
Describes the capture of a variable or of this, or of a C++1y init-capture.
Definition: LambdaCapture.h:26
MSInheritanceAttr::Spelling getMSInheritanceModel() const
Returns the inheritance model used for this record.
QualType getElementType() const
Definition: Type.h:2843
bool isCompleteDefinition() const
Return true if this decl has its body fully specified.
Definition: Decl.h:3161
StringRef getBufferData(FileID FID, bool *Invalid=nullptr) const
Return a StringRef to the source buffer data for the specified FileID.
enumerator_range enumerators() const
Definition: Decl.h:3445
bool isInterface() const
Definition: Decl.h:3242
Represents a variable declaration or definition.
Definition: Decl.h:812
void removeObjCLifetime()
Definition: Type.h:336
QualType getReturnType() const
Definition: Decl.h:2286
bool isFixed() const
Returns true if this is an Objective-C, C++11, or Microsoft-style enumeration with a fixed underlying...
Definition: Decl.h:3521
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6683
Represents an empty template argument, e.g., one that has not been deduced.
Definition: TemplateBase.h:57
Extra information about a function prototype.
Definition: Type.h:3752
decl_range decls() const
decls_begin/decls_end - Iterate over the declarations stored in this context.
Definition: DeclBase.h:1996
A this pointer adjustment.
Definition: ABI.h:108
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
Stores a list of template parameters for a TemplateDecl and its derived classes.
Definition: DeclTemplate.h:68
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:38
bool isStatic() const
Definition: DeclCXX.cpp:1872
void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD)
bool hasDefinition() const
Definition: DeclCXX.h:776
Represents a parameter to a function.
Definition: Decl.h:1551
QualType getIntegralType() const
Retrieve the type of the integral value.
Definition: TemplateBase.h:315
static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD)
The collection of all-type qualifiers we support.
Definition: Type.h:141
PipeType - OpenCL20.
Definition: Type.h:5976
bool isClass() const
Definition: Decl.h:3243
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:269
void EmitInlineFunctionEnd(CGBuilderTy &Builder)
End an inlined function scope.
Represents a struct/union/class.
Definition: Decl.h:3585
const TemplateArgumentList & getTemplateArgs() const
Retrieve the template arguments of the class template specialization.
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:297
Represents a class template specialization, which refers to a class template with a given set of temp...
One of these records is kept for each identifier that is lexed.
std::map< std::string, std::string > DebugPrefixMap
void print(raw_ostream &OS, const PrintingPolicy &Policy, bool SuppressNNS=false) const
Print the template name.
Represents a class type in Objective C.
Definition: Type.h:5512
void removeRestrict()
Definition: Type.h:276
QualType getPointeeType() const
Definition: Type.h:2650
CodeGenFunction - This class organizes the per-function state that is used while generating LLVM code...
Expr * getAsExpr() const
Retrieve the template argument as an expression.
Definition: TemplateBase.h:330
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:154
bool isInline() const
Returns true if this is an inline namespace declaration.
Definition: Decl.h:575
The template argument is an integral value stored in an llvm::APSInt that was provided for an integra...
Definition: TemplateBase.h:72
static bool isFunctionLocalClass(const CXXRecordDecl *RD)
isFunctionLocalClass - Return true if CXXRecordDecl is defined inside a function. ...
TemplateDecl * getAsTemplateDecl() const
Retrieve the underlying template declaration that this template name refers to, if known...
RecordDecl * getDefinition() const
Returns the RecordDecl that actually defines this struct/union/class.
Definition: Decl.h:3766
void EmitImportDecl(const ImportDecl &ID)
Emit an declaration.
field_range fields() const
Definition: Decl.h:3776
Represents a member of a struct/union/class.
Definition: Decl.h:2571
TemplateName getTemplateName() const
Retrieve the name of the template that we are specializing.
Definition: Type.h:4880
void removeConst()
Definition: Type.h:262
CXXMethodDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclCXX.h:2127
prop_range properties() const
Definition: DeclObjC.h:980
void completeClassData(const RecordDecl *RD)
static CharUnits Zero()
Zero - Construct a CharUnits quantity of zero.
Definition: CharUnits.h:53
llvm::DIMacro * CreateMacro(llvm::DIMacroFile *Parent, unsigned MType, SourceLocation LineLoc, StringRef Name, StringRef Value)
Create debug info for a macro defined by a #define directive or a macro undefined by a #undef directi...
method_iterator method_begin() const
Method begin iterator.
Definition: DeclCXX.h:871
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:50
bool isFloat() const
Definition: APValue.h:235
Describes a module or submodule.
Definition: Module.h:65
QualType getParamTypeForDecl() const
Definition: TemplateBase.h:269
unsigned getTypeQuals() const
Definition: Type.h:3996
Qualifiers getLocalQualifiers() const
Retrieve the set of qualifiers local to this particular QualType instance, not including any qualifie...
Definition: Type.h:6065
ArrayRef< ParmVarDecl * > parameters() const
Definition: Decl.h:2246
Provides information about a function template specialization, which is a FunctionDecl that has been ...
Definition: DeclTemplate.h:508
bool isGLValue() const
Definition: Expr.h:251
Represents a C++ using-declaration.
Definition: DeclCXX.h:3346
Type(TypeClass tc, QualType canon, bool Dependent, bool InstantiationDependent, bool VariablyModified, bool ContainsUnexpandedParameterPack)
Definition: Type.h:1776
const TemplateArgumentList * TemplateArguments
The template arguments used to produce the function template specialization from the function templat...
Definition: DeclTemplate.h:540
static SmallString< 64 > constructSetterName(StringRef Name)
Return the default setter name for the given identifier.
ArrayRef< VTableComponent > vtable_components() const
unsigned Size
The total size of the bit-field, in bits.
An rvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2734
QualType getThisType(ASTContext &C) const
Returns the type of the this pointer.
Definition: DeclCXX.cpp:2176
bool isBitField() const
Determines whether this field is a bitfield.
Definition: Decl.h:2649
bool isNonFragile() const
Does this runtime follow the set of implied behaviors for a "non-fragile" ABI?
Definition: ObjCRuntime.h:82
RefQualifierKind getRefQualifier() const
Retrieve the ref-qualifier associated with this method.
Definition: DeclCXX.h:2200
An lvalue ref-qualifier was provided (&).
Definition: Type.h:1371
~ApplyInlineDebugLocation()
Restore everything back to the orginial state.
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
bool capturesThis() const
Determine whether this capture handles the C++ this pointer.
Definition: LambdaCapture.h:83
const BlockDecl * getBlockDecl() const
Definition: CGBlocks.h:281
uint32_t Offset
Definition: CacheTokens.cpp:43
Emit location information but do not generate debug info in the output.
bool hasPrototype() const
Whether this function has a prototype, either because one was explicitly written or because it was "i...
Definition: Decl.h:2061
CharUnits StorageOffset
The offset of the bitfield storage from the start of the struct.
QualType getNullPtrType() const
Retrieve the type for null non-type template argument.
Definition: TemplateBase.h:275
bool isTypeAlias() const
Determine if this template specialization type is for a type alias template that has been substituted...
Definition: Type.h:4865
void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl)
Emit information about a global variable.
Deleting dtor.
Definition: ABI.h:35
bool isByRef() const
Whether this is a "by ref" capture, i.e.
Definition: Decl.h:3881
Represents a declaration of a type.
Definition: Decl.h:2866
static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU)
Module * Parent
The parent of this module.
Definition: Module.h:91
const Type * getClass() const
Definition: Type.h:2786
FunctionTemplateSpecializationInfo * getTemplateSpecializationInfo() const
If this function is actually a function template specialization, retrieve information about this func...
Definition: Decl.cpp:3465
bool isLambda() const
Determine whether this class describes a lambda function object.
Definition: DeclCXX.h:1196
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R)
Returns the common set of qualifiers while removing them from the given sets.
Definition: Type.h:192
llvm::DIType * getOrCreateInterfaceType(QualType Ty, SourceLocation Loc)
Emit an Objective-C interface type standalone debug info.
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:6046
unsigned Align
Definition: ASTContext.h:144
field_iterator field_begin() const
Definition: Decl.cpp:4141
bool AlignIsRequired
Definition: ASTContext.h:145
bool isInt() const
Definition: APValue.h:234
bool isCompleteDefinitionRequired() const
Return true if this complete decl is required to be complete for some existing use.
Definition: Decl.h:3170
unsigned Offset
The offset within a contiguous run of bitfields that are represented as a single "field" within the L...
static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx)
Definition: CGDebugInfo.cpp:61
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC)...
Definition: DeclBase.h:821
void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn)
Constructs the debug code for exiting a function.
llvm::DIImportedEntity * EmitNamespaceAlias(const NamespaceAliasDecl &NA)
Emit C++ namespace alias.
bool isInstance() const
Definition: DeclCXX.h:2069
void * getAsOpaquePtr() const
Definition: Type.h:687
FunctionDecl * getInstantiatedFromMemberFunction() const
If this function is an instantiation of a member function of a class template specialization, retrieves the function from which it was instantiated.
Definition: Decl.cpp:3328
Represents an ObjC class declaration.
Definition: DeclObjC.h:1164
shadow_iterator shadow_begin() const
Definition: DeclCXX.h:3450
void removeVolatile()
Definition: Type.h:269
bool hasConst() const
Definition: Type.h:258
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:870
bool isAnonymousStructOrUnion() const
Whether this is an anonymous struct or union.
Definition: Decl.h:3658
Module * getImportedModule() const
Retrieve the module that was imported by the import declaration.
Definition: Decl.h:4185
bool NeedsCopyDispose
True if the block has captures that would necessitate custom copy or dispose helper functions if the ...
Definition: CGBlocks.h:223
ObjCPropertyImplDecl - Represents implementation declaration of a property in a class or category imp...
Definition: DeclObjC.h:2751
NodeId Parent
Definition: ASTDiff.cpp:192
QualType getBlockDescriptorExtendedType() const
Gets the struct used to keep track of the extended descriptor for pointer to blocks.
static unsigned getDwarfCC(CallingConv CC)
bool hasAttr() const
Definition: DeclBase.h:531
QualType getBaseType() const
Gets the base type of this object type.
Definition: Type.h:5575
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3676
bool isDynamicClass() const
Definition: DeclCXX.h:789
unsigned MSVCFormatting
Use whitespace and punctuation like MSVC does.
CGBlockInfo - Information to generate a block literal.
Definition: CGBlocks.h:153
TemplateSpecializationKind getTemplateSpecializationKind() const
Determine whether this particular class is a specialization or instantiation of a class template or m...
Definition: DeclCXX.cpp:1627
Represents a ValueDecl that came out of a declarator.
Definition: Decl.h:688
QuantityType getQuantity() const
getQuantity - Get the raw integer representation of this quantity.
Definition: CharUnits.h:179
ObjCTypeParamDecl * getDecl() const
Definition: Type.h:5481
void setDwoId(uint64_t Signature)
Module debugging: Support for building PCMs.
ValueDecl * getAsDecl() const
Retrieve the declaration for a declaration non-type template argument.
Definition: TemplateBase.h:264
ASTRecordLayout - This class contains layout information for one RecordDecl, which is a struct/union/...
Definition: RecordLayout.h:39
capture_const_iterator captures_end() const
Definition: DeclCXX.h:1256
llvm::DILocalVariable * EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI, CGBuilderTy &Builder)
Emit call to llvm.dbg.declare for an automatic variable declaration.
bool isValid() const
void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc)
Emit metadata to indicate a change in line/column information in the source file. ...
TemplateParameterList * getTemplateParameters() const
Get the list of template parameters.
Definition: DeclTemplate.h:432
ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn)
Set up the CodeGenFunction&#39;s DebugInfo to produce inline locations for the function InlinedFn...
Pepresents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3850
Represent the declaration of a variable (in which case it is an lvalue) a function (in which case it ...
Definition: Decl.h:636
This represents one expression.
Definition: Expr.h:105
QualType getPointeeType() const
Definition: Type.h:2690
SourceLocation End
known_extensions_range known_extensions() const
Definition: DeclObjC.h:1753
Emit only debug info necessary for generating line number tables (-gline-tables-only).
bool isPositive() const
isPositive - Test whether the quantity is greater than zero.
Definition: CharUnits.h:122
bool isVariadic() const
Whether this function is variadic.
Definition: Decl.cpp:2686
bool isInvalid() const
Return true if this object is invalid or uninitialized.
void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD)
Start a new scope for an inlined function.
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
const AnnotatedLine * Line
const CXXRecordDecl * getPointeeCXXRecordDecl() const
If this is a pointer or reference to a RecordType, return the CXXRecordDecl that the type refers to...
Definition: Type.cpp:1590
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6746
The template argument is a null pointer or null pointer to member that was provided for a non-type te...
Definition: TemplateBase.h:68
unsigned getLine() const
Return the presumed line number of this location.
Represents a C++ destructor within a class.
Definition: DeclCXX.h:2700
Defines version macros and version-related utility functions for Clang.
bool isAnonymousNamespace() const
Returns true if this is an anonymous namespace declaration.
Definition: Decl.h:570
bool isImplicit() const
isImplicit - Indicates whether the declaration was implicitly generated by the implementation.
Definition: DeclBase.h:547
const TemplateArgumentList * getTemplateSpecializationArgs() const
Retrieve the template arguments used to produce this function template specialization from the primar...
Definition: Decl.cpp:3471
llvm::DIMacroFile * CreateTempMacroFile(llvm::DIMacroFile *Parent, SourceLocation LineLoc, SourceLocation FileLoc)
Create debug info for a file referenced by an #include directive.
field_iterator field_end() const
Definition: Decl.h:3779
ClassTemplateDecl * getSpecializedTemplate() const
Retrieve the template that this specialization specializes.
StringRef getNameForSlot(unsigned argIndex) const
Retrieve the name at a given position in the selector.
DeclContext * getDeclContext()
Definition: DeclBase.h:427
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:338
const CXXRecordDecl * getPrimaryBase() const
getPrimaryBase - Get the primary base for this record.
Definition: RecordLayout.h:218
static CharUnits fromQuantity(QuantityType Quantity)
fromQuantity - Construct a CharUnits quantity from a raw integer type.
Definition: CharUnits.h:63
ArrayRef< TemplateArgument > asArray() const
Produce this as an array ref.
Definition: DeclTemplate.h:264
void completeUnusedClass(const CXXRecordDecl &D)
EnumDecl * getDefinition() const
Definition: Decl.h:3419
void printTemplateArgumentList(raw_ostream &OS, ArrayRef< TemplateArgument > Args, const PrintingPolicy &Policy)
Print a template argument list, including the &#39;<&#39; and &#39;>&#39; enclosing the template arguments.
bool isSignedIntegerType() const
Return true if this is an integer type that is signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], or an enum decl which has a signed representation.
Definition: Type.cpp:1836
QualType getType() const
Definition: Expr.h:127
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:176
bool hasExtendableVFPtr() const
hasVFPtr - Does this class have a virtual function table pointer that can be extended by a derived cl...
Definition: RecordLayout.h:268
unsigned getMaxAlignment() const
getMaxAlignment - return the maximum alignment specified by attributes on this decl, 0 if there are none.
Definition: DeclBase.cpp:384
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1751
method_iterator method_end() const
Method past-the-end iterator.
Definition: DeclCXX.h:876
Represents an unpacked "presumed" location which can be presented to the user.
bool isInstanceMethod() const
Definition: DeclObjC.h:414
QualType getBlockDescriptorType() const
Gets the struct used to keep track of the descriptor for pointer to blocks.
Represents a GCC generic vector type.
Definition: Type.h:3164
SourceLocation getCaretLocation() const
Definition: Decl.h:3923
An lvalue reference type, per C++11 [dcl.ref].
Definition: Type.h:2716
APValue * evaluateValue() const
Attempt to evaluate the value of the initializer attached to this declaration, and produce notes expl...
Definition: Decl.cpp:2258
Selector getSelector() const
Definition: DeclObjC.h:321
void printQualifiedName(raw_ostream &OS) const
Returns a human-readable qualified name for this declaration, like A::B::i, for i being member of nam...
Definition: Decl.cpp:1527
bool isUnionType() const
Definition: Type.cpp:467
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:707
ImplicitParamDecl * getSelfDecl() const
Definition: DeclObjC.h:406
const SourceManager & SM
Definition: Format.cpp:1490
CallingConv
CallingConv - Specifies the calling convention that a function uses.
Definition: Specifiers.h:236
VarDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:2026
GlobalDecl - represents a global declaration.
Definition: GlobalDecl.h:35
bool isObjCOneArgSelector() const
The l-value was considered opaque, so the alignment was determined from a type.
RecordDecl * getDecl() const
Definition: Type.h:4356
const char * getFilename() const
Return the presumed filename of this location.
void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI, unsigned ArgNo, CGBuilderTy &Builder)
Emit call to llvm.dbg.declare for an argument variable declaration.
bool capturesVariable() const
Determine whether this capture handles a variable.
Definition: LambdaCapture.h:89
Pass it as a pointer to temporary memory.
Definition: CGCXXABI.h:137
uint64_t getFieldOffset(unsigned FieldNo) const
getFieldOffset - Get the offset of the given field index, in bits.
Definition: RecordLayout.h:191
virtual void printName(raw_ostream &os) const
Definition: Decl.cpp:1516
unsigned size_overridden_methods() const
Definition: DeclCXX.cpp:2164
void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType)
Emit debug info for a function declaration.
static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access, const RecordDecl *RD)
Convert an AccessSpecifier into the corresponding DINode flag.
std::string getAsString() const
Derive the full selector name (e.g.
llvm::MemoryBuffer * getBuffer(FileID FID, SourceLocation Loc, bool *Invalid=nullptr) const
Return the buffer for the specified FileID.
virtual void mangleCXXRTTIName(QualType T, raw_ostream &)=0
ExtProtoInfo getExtProtoInfo() const
Definition: Type.h:3880
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: Redeclarable.h:295
unsigned getColumn() const
Return the presumed column number of this location.
Encodes a location in the source.
ObjCInterfaceDecl * getDecl() const
Get the declaration of this interface.
Definition: Type.h:5725
QualType getReturnType() const
Definition: Type.h:3607
bool isPure() const
Whether this virtual function is pure, i.e.
Definition: Decl.h:2003
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of enums...
Definition: Type.h:4372
Interfaces are the core concept in Objective-C for object oriented design.
Definition: Type.h:5712
llvm::StructType * StructureType
Definition: CGBlocks.h:246
void completeRequiredType(const RecordDecl *RD)
std::string getNameAsString() const
Get a human-readable name for the declaration, even if it is one of the special kinds of names (C++ c...
Definition: Decl.h:291
Limit generated debug info to reduce size (-fno-standalone-debug).
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3056
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:376
QualType getElementType() const
Definition: Type.h:3199
const Decl * getDecl() const
Definition: GlobalDecl.h:64
static QualType getUnderlyingType(const SubRegion *R)
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:60
APFloat & getFloat()
Definition: APValue.h:260
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2041
TypedefNameDecl * getTypedefNameForUnnamedTagDecl(const TagDecl *TD)
ObjCCategoryDecl - Represents a category declaration.
Definition: DeclObjC.h:2272
llvm::Constant * emitAbstract(const Expr *E, QualType T)
Emit the result of the given expression as an abstract constant, asserting that it succeeded...
Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy)
Definition: Decl.h:3871
bool hasRestrict() const
Definition: Type.h:272
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:721
bool isFromASTFile() const
Determine whether this declaration came from an AST file (such as a precompiled header or module) rat...
Definition: DeclBase.h:695
const BlockExpr * getBlockExpr() const
Definition: CGBlocks.h:282
TypeClass getTypeClass() const
Definition: Type.h:1817
MangleContext & getMangleContext()
Gets the mangle context.
Definition: CGCXXABI.h:97
This template specialization was formed from a template-id but has not yet been declared, defined, or instantiated.
Definition: Specifiers.h:149
bool operator<(DeclarationName LHS, DeclarationName RHS)
Ordering on two declaration names.
VarDecl * getVariable() const
The variable being captured.
Definition: Decl.h:3877
llvm::APSInt getAsIntegral() const
Retrieve the template argument as an integral value.
Definition: TemplateBase.h:301
EnumDecl * getDecl() const
Definition: Type.h:4379
unsigned CXXThisIndex
The field index of &#39;this&#39; within the block, if there is one.
Definition: CGBlocks.h:159
An rvalue ref-qualifier was provided (&&).
Definition: Type.h:1374
void removeObjCGCAttr()
Definition: Type.h:313
ObjCImplementationDecl * getImplementation() const
Definition: DeclObjC.cpp:1549
static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I, CXXRecordDecl::method_iterator End)
llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc)
Describes a module import declaration, which makes the contents of the named module visible in the cu...
Definition: Decl.h:4141
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:216
StringRef getName() const
Return the actual identifier string.
Base class for declarations which introduce a typedef-name.
Definition: Decl.h:2908
CXXRecordDecl * getMostRecentCXXRecordDecl() const
Definition: Type.cpp:3981
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
Represents a template argument.
Definition: TemplateBase.h:51
void completeClass(const RecordDecl *RD)
This class organizes the cross-function state that is used while generating LLVM code.
NamespaceDecl * getNominatedNamespace()
Returns the namespace nominated by this using-directive.
Definition: DeclCXX.cpp:2556
Dataflow Directional Tag Classes.
virtual void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const
Appends a human-readable name for this declaration into the given stream.
Definition: Decl.cpp:1620
bool isValid() const
Return true if this is a valid SourceLocation object.
A qualifier set is used to build a set of qualifiers.
Definition: Type.h:6013
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1261
uint64_t Index
Method&#39;s index in the vftable.
ArrayRef< Capture > captures() const
Definition: Decl.h:3977
static SmallString< 256 > getTypeIdentifier(const TagType *Ty, CodeGenModule &CGM, llvm::DICompileUnit *TheCU)
The template argument is a pack expansion of a template name that was provided for a template templat...
Definition: TemplateBase.h:80
bool isRecord() const
Definition: DeclBase.h:1826
Parameter for Objective-C &#39;self&#39; argument.
Definition: Decl.h:1496
QualType getUnderlyingType() const
Definition: Decl.h:2963
llvm::iterator_range< base_class_const_iterator > base_class_const_range
Definition: DeclCXX.h:821
const Expr * getInit() const
Definition: Decl.h:1219
AccessSpecifier getAccess() const
Definition: DeclBase.h:462
ObjCInterfaceDecl * getDefinition()
Retrieve the definition of this class, or NULL if this class has been forward-declared (with @class) ...
Definition: DeclObjC.h:1541
FileID getMainFileID() const
Returns the FileID of the main source file.
bool hasLocalQualifiers() const
Determine whether this particular QualType instance has any qualifiers, without looking through any t...
Definition: Type.h:744
Emit only debug directives with the line numbers data.
This template specialization was instantiated from a template due to an explicit instantiation declar...
Definition: Specifiers.h:160
const CXXRecordDecl * getParent() const
Returns the parent of this method declaration, which is the class in which this method is defined...
Definition: DeclCXX.h:2166
const Type * strip(QualType type)
Collect any qualifiers on the given type and return an unqualified type.
Definition: Type.h:6020
Decl * getNonClosureContext()
Find the innermost non-closure ancestor of this declaration, walking up through blocks, lambdas, etc.
Definition: DeclBase.cpp:1002
unsigned shadow_size() const
Return the number of shadowed declarations associated with this using declaration.
Definition: DeclCXX.h:3458
CGDebugInfo(CodeGenModule &CGM)
Definition: CGDebugInfo.cpp:65
Represents an enum.
Definition: Decl.h:3318
unsigned StorageSize
The storage size in bits which should be used when accessing this bitfield.
PresumedLoc getPresumedLoc(SourceLocation Loc, bool UseLineDirectives=true) const
Returns the "presumed" location of a SourceLocation specifies.
A pointer to member type per C++ 8.3.3 - Pointers to members.
Definition: Type.h:2752
TemplateSpecializationKind
Describes the kind of template specialization that a particular template specialization declaration r...
Definition: Specifiers.h:146
QualType apply(const ASTContext &Context, QualType QT) const
Apply the collected qualifiers to the given type.
Definition: Type.cpp:3340
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1089
specific_decl_iterator - Iterates over a subrange of declarations stored in a DeclContext, providing only those that are of type SpecificDecl (or a class derived from it).
Definition: DeclBase.h:2016
Represents a pointer to an Objective C object.
Definition: Type.h:5768
Pointer to a block type.
Definition: Type.h:2635
FileID getFileID(SourceLocation SpellingLoc) const
Return the FileID for a SourceLocation.
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2544
bool isIncompleteArrayType() const
Definition: Type.h:6327
A helper class that allows the use of isa/cast/dyncast to detect TagType objects of structs/unions/cl...
Definition: Type.h:4346
Complex values, per C99 6.2.5p11.
Definition: Type.h:2473
Don&#39;t generate debug info.
void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc, SourceLocation ScopeLoc, QualType FnType, llvm::Function *Fn, bool CurFnIsThunk, CGBuilderTy &Builder)
Emit a call to llvm.dbg.function.start to indicate start of a new function.
bool empty() const
Definition: Type.h:418
llvm::DIType * getOrCreateStandaloneType(QualType Ty, SourceLocation Loc)
Emit standalone debug info for a type.
unsigned getOwningModuleID() const
Retrieve the global ID of the module that owns this particular declaration.
Definition: DeclBase.h:707
void completeType(const EnumDecl *ED)
DeclaratorDecl * getDeclaratorForUnnamedTagDecl(const TagDecl *TD)
The template argument is a type.
Definition: TemplateBase.h:60
The template argument is actually a parameter pack.
Definition: TemplateBase.h:91
APValue - This class implements a discriminated union of [uninitialized] [APSInt] [APFloat]...
Definition: APValue.h:38
uint64_t getTypeSize(QualType T) const
Return the size of the specified (complete) type T, in bits.
Definition: ASTContext.h:2076
bool isIncompleteType(NamedDecl **Def=nullptr) const
Types are partitioned into 3 broad categories (C99 6.2.5p1): object types, function types...
Definition: Type.cpp:2023
The type-property cache.
Definition: Type.cpp:3419
bool capturesCXXThis() const
Definition: Decl.h:3982
A template argument list.
Definition: DeclTemplate.h:210
TypedefNameDecl * getDecl() const
Definition: Type.h:4143
void EmitUsingDecl(const UsingDecl &UD)
Emit C++ using declaration.
void EmitUsingDirective(const UsingDirectiveDecl &UD)
Emit C++ using directive.
void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc)
Emit metadata to indicate the beginning of a new lexical block and push the block onto the stack...
ArgKind getKind() const
Return the kind of stored template argument.
Definition: TemplateBase.h:235
Represents a type parameter type in Objective C.
Definition: Type.h:5438
CallingConv getCallConv() const
Definition: Type.h:3617
QualType getAliasedType() const
Get the aliased type, if this is a specialization of a type alias template.
Definition: Type.h:4869
TypedefNameDecl * getTypedefNameForAnonDecl() const
Definition: Decl.h:3266
Represents a C++ struct/union/class.
Definition: DeclCXX.h:300
ArrayRef< TemplateArgument > template_arguments() const
Definition: Type.h:4896
TypeInfo getTypeInfo(const Type *T) const
Get the size and alignment of the specified complete type in bits.
The template argument is a template name that was provided for a template template parameter...
Definition: TemplateBase.h:76
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1937
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable, llvm::Value *storage, CGBuilderTy &Builder, const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint=nullptr)
Emit call to llvm.dbg.declare for an imported variable declaration in a block.
This class is used for builtin types like &#39;int&#39;.
Definition: Type.h:2390
void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block, StringRef Name, unsigned ArgNo, llvm::AllocaInst *LocalAddr, CGBuilderTy &Builder)
Emit call to llvm.dbg.declare for the block-literal argument to a block invocation function...
SourceLocation getLocation() const
Retrieve the source location of the capture.
bool isComplexIntegerType() const
Definition: Type.cpp:479
QualType getIntegerType() const
Return the integer type this enum decl corresponds to.
Definition: Decl.h:3472
StringRef getName() const
Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:275
bool hasVolatile() const
Definition: Type.h:265
void setLocation(SourceLocation Loc)
Update the current source location.
CGCXXABI & getCXXABI() const
uint64_t Width
Definition: ASTContext.h:143
std::string getQualifiedNameAsString() const
Definition: Decl.cpp:1520
CanQualType IntTy
Definition: ASTContext.h:1034
Abstracts clang modules and precompiled header files and holds everything needed to generate debug in...
unsigned getNumElements() const
Definition: Type.h:3200
QualType getAsType() const
Retrieve the type for a type template argument.
Definition: TemplateBase.h:257
bool isUnion() const
Definition: Decl.h:3244
Represents a type template specialization; the template must be a class template, a type alias templa...
Definition: Type.h:4817
const internal::VariadicDynCastAllOfMatcher< Decl, BlockDecl > blockDecl
Matches block declarations.
static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD)
Return true if the class or any of its methods are marked dllimport.
TemplatedKind getTemplatedKind() const
What kind of templated function this is.
Definition: Decl.cpp:3312
capture_const_iterator captures_begin() const
Definition: DeclCXX.h:1252
bool isStaticDataMember() const
Determines whether this is a static data member.
Definition: Decl.h:1134
QualType getType() const
Definition: Decl.h:647
static InputKind getInputKindForExtension(StringRef Extension)
getInputKindForExtension - Return the appropriate input kind for a file extension.
A wrapper class around a pointer that always points to its canonical declaration. ...
Definition: Redeclarable.h:348
FunctionDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:2965
ObjCIvarDecl * all_declared_ivar_begin()
all_declared_ivar_begin - return first ivar declared in this class, its extensions and its implementa...
Definition: DeclObjC.cpp:1592
Represents a C++ namespace alias.
Definition: DeclCXX.h:3014
TemplateName getAsTemplate() const
Retrieve the template name for a template name argument.
Definition: TemplateBase.h:281
APSInt & getInt()
Definition: APValue.h:252
static bool isDefinedInClangModule(const RecordDecl *RD)
Does a type definition exist in an imported clang module?
Represents C++ using-directive.
Definition: DeclCXX.h:2910
void removeAddressSpace()
Definition: Type.h:381
bool isObjCZeroArgSelector() const
base_class_range vbases()
Definition: DeclCXX.h:840
This class handles loading and caching of source files into memory.
SourceLocation getLocation() const
Definition: DeclBase.h:418
QualType getPointeeType() const
Definition: Type.h:2772
Represents a shadow declaration introduced into a scope by a (resolved) using declaration.
Definition: DeclCXX.h:3133
bool isExternallyVisible() const
Definition: Decl.h:379
Structure with information about how a bitfield should be accessed.
NamedDecl * getAliasedNamespace() const
Retrieve the namespace that this alias refers to, which may either be a NamespaceDecl or a NamespaceA...
Definition: DeclCXX.h:3110
QualType getPointeeType() const
Gets the type pointed to by this ObjC pointer.
Definition: Type.h:5784
method_range methods() const
Definition: DeclCXX.h:865